Journal of chemical technology and biotechnology最新文献

{"title":"Synergistic effects of CNF-TiO2 composites and process parameters on DMFC performance enhancement","authors":"Muhammad Syafiq Alias,&nbsp;Siti Kartom Kamarudin,&nbsp;Wei Lun Ang,&nbsp;Mohd Shahbudin Masdar,&nbsp;Norilhamiah Yahya,&nbsp;Nabila A. Karim","doi":"10.1002/jctb.70021","DOIUrl":"10.1002/jctb.70021","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <h3> BACKGROUND</h3>\u0000 \u0000 <p>Direct methanol fuel cells (DMFCs) face challenges from methanol crossover and performance degradation caused by inefficient microporous layer (MPL) designs, where conventional carbon-based MPLs show limitations in surface coverage uniformity, catalyst utilization efficiency, and pore structure balance. To address these issues, this study developed an optimized MPL using carbon nanofiber-titanium dioxide (CNF-TiO₂) composites through parametric optimization of the fabrication process. Key variables included MPL loading density, CNF:TiO₂ mass ratio, Nafion binder concentration, and methanol feed concentration, which were analyzed <i>via</i> screening experiments and Response Surface Methodology (RSM) using a Central Composite Design (CCD). The optimization targeted three response metrics: power density (R1), open-circuit voltage (R2), and peak current density (R3).</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> RESULTS</h3>\u0000 \u0000 <p>The results demonstrated that the modified CNF-TiO₂ microporous layer (MPL) exhibited a synergistic effect when optimized with the selected parameters. Initial screening experiments examined MPL loading, CNF-to-TiO₂ ratio, Nafion® content, and methanol concentration, revealing that the composition ratio, Nafion® content, and methanol concentration had significant impacts on the cell's performance responses. These key parameters were further explored using Response Surface Methodology (RSM). The optimized MPL exhibited improved surface coverage and promoted pore development, resulting in 1.22% microporosity and 34.31% mesoporosity. As a result, the composite MPL enhanced peak power density by 55%, reaching 70.43 mW cm⁻². Analysis of variance (ANOVA) confirmed that the improvements in power density, open-circuit voltage, and optimal current density were statistically significant, highlighting the effectiveness of the composite MPL design and process optimization in enhancing DMFC performance.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> CONCLUSION</h3>\u0000 \u0000 <p>These findings highlight the essential need to integrate nanocomposite engineering with parametric optimization to achieve coverage uniformity, catalyst utilization efficiency, and pore structure balance. The research presents a verified methodology for multi-objective optimization in DMFCs, enhancing scalable, high-performance fuel cell systems for sustainable energy applications. © 2025 Society of Chemical Industry (SCI).</p>\u0000 </section>\u0000 </div>","PeriodicalId":15335,"journal":{"name":"Journal of chemical technology and biotechnology","volume":"100 10","pages":"2103-2117"},"PeriodicalIF":2.4,"publicationDate":"2025-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145062341","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Removal of lead ions from aqueous solutions via polyelectrolyte enhanced ultrafiltration and nanofiltration: efficacy evaluation of chitosan, polyethylenimine, and polyacrylic acid","authors":"Molka Nafti-Mateur,&nbsp;Celine Pochat-Bohatier,&nbsp;Karima Horchani-Naifer,&nbsp;Mouna Jaouadi,&nbsp;Dorra Jellouli Ennigrou","doi":"10.1002/jctb.70016","DOIUrl":"10.1002/jctb.70016","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <h3> BACKGROUND</h3>\u0000 \u0000 <p>Lead contamination in wastewater is a significant environmental issue, necessitating effective removal methods. This study evaluates the performance of polyelectrolyte-enhanced ultrafiltration (PEUF) and nanofiltration (NF) processes for removing lead ions from aqueous solutions. The objective was to assess the effectiveness of various polyelectrolytes (chitosan, polyethylenimine, and polyacrylic acid) in conjunction with ultrafiltration and to investigate the influence of experimental parameters on lead retention and permeate flux.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> RESULTS</h3>\u0000 \u0000 <p>In the PEUF process, a polyethersulfone membrane with a pore size of 10 kDa (PES10) was used. The maximum lead ion rejection of 97% was achieved with polyacrylic acid (PAA) at a concentration of 600 ppm and a transmembrane pressure of 4 bar. Increasing the feed pH enhanced lead retention but reduced permeate flux. Higher ionic strength negatively affected both lead retention and permeate flux. Over time, permeate flux decreased from 553 to 221 L/h/m² due to solute accumulation and polymer aggregation. For the NF process, the maximum lead retention of 68% occurred at a transmembrane pressure of 6 bar. Lead retention increased at lower pH (73% at pH 2) but decreased at higher pH (47% at pH 5). The addition of salt adversely affected lead removal.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> CONCLUSION</h3>\u0000 \u0000 <p>Both PEUF and NF methods effectively removed lead ions from wastewater, with PEUF showing higher removal efficiency. These findings demonstrate the potential of these filtration processes for heavy metals remediation in water treatment applications. © 2025 Society of Chemical Industry (SCI).</p>\u0000 </section>\u0000 </div>","PeriodicalId":15335,"journal":{"name":"Journal of chemical technology and biotechnology","volume":"100 10","pages":"2065-2077"},"PeriodicalIF":2.4,"publicationDate":"2025-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145062391","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Diazotization of Nano-Titanium Dioxide; A Novel Approach to obtain Colored Metal Oxides","authors":"Mehrnoosh Bitaraf,&nbsp;Ali Amoozadeh","doi":"10.1002/jctb.7914","DOIUrl":"10.1002/jctb.7914","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <h3> BACKGROUND</h3>\u0000 \u0000 <p>Dye sensitization is a promising approach to modify semiconductor photocatalysts. However, the use of synthetic dyes is neither cost-effective nor rational.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> RESULTS</h3>\u0000 \u0000 <p>This research is the first report on the synthesis of colored nano-titanium dioxides as dye-sensitized photocatalysts <i>via</i> a convenient azo coupling reaction directly on the surface of n-TiO₂-P25. According to their reduced band gap (2.6, 2.5, and 2.35 eV for dye-sensitized n-TiO₂-P25 compared to 3.2 eV for bare n-TiO₂-P25), dye-sensitized TiO₂-P25 nanoparticles showed the absorption edge in the visible region, which expands their application compared to ultraviolet absorption in bare titanium dioxide. Various characterization techniques confirmed the structure and enhanced properties of the as-prepared nanoparticles, which were utilized as photocatalysts for the selective oxidation of benzyl alcohol to benzaldehyde in the presence of nitrate as an oxidant. These reactions were carried out under different wavelengths of visible light (blue LED, <i>λ</i> &gt; 420 nm; green LED, <i>λ</i> &gt; 510 nm; and red LED <i>λ</i> &gt; 620 nm), yielded promising results, with reaction times of 19 h and significantly improved yields ranging from 80% to 20%, in comparison with the bare n-TiO₂-P25. Furthermore, these photocatalysts are properly recyclable and reusable, addressing limitations of dye sensitization methods.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> CONCLUSION</h3>\u0000 \u0000 <p>This study introduces an effective and straightforward approach for engineering visible light responsive TiO₂ nano-particles <i>via</i> azo coupling reaction. The covalent linkage of dyes not only improves light absorption and photocatalytic efficiency, but also overcomes the drawbacks associated with physical dye absorption, offering outstanding potential for advanced applications and future studies. © 2025 Society of Chemical Industry (SCI).</p>\u0000 </section>\u0000 </div>","PeriodicalId":15335,"journal":{"name":"Journal of chemical technology and biotechnology","volume":"100 9","pages":"1792-1805"},"PeriodicalIF":2.4,"publicationDate":"2025-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144888269","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Microwave-assisted synthesis of magnetic CuFe2O4 nanocatalysts for rapid room-temperature reduction of 4-nitroaniline","authors":"Duc Toan Ngo,&nbsp;Thi Trinh Thi Tran,&nbsp;The Luan Nguyen,&nbsp;Chau Ngoc Hoang,&nbsp;Tuyet-Mai Tran-Thuy,&nbsp;Thi Xuan Thi Luu,&nbsp;Tien Khoa Le","doi":"10.1002/jctb.70025","DOIUrl":"10.1002/jctb.70025","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <h3> BACKGROUND</h3>\u0000 \u0000 <p>The development of environmentally friendly and efficient catalysts for pollutant reduction is a pressing need in green chemistry. Magnetic spinel ferrites, particularly CuFe₂O₄, are promising candidates due to their recoverability and tunable catalytic properties. However, conventional synthesis methods often require high temperatures and long durations.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> RESULTS</h3>\u0000 \u0000 <p>Our study presents a green and rapid method for synthesizing CuFe₂O₄ nanoparticles as magnetically recoverable catalysts for the reduction of 4-nitroaniline at room temperature, using a coprecipitation–microwave treatment approach. The microwave-assisted synthesis enabled the formation of a well-crystallized cubic spinel phase without necessitating prolonged high-temperature calcination. The resulting materials were thoroughly characterized for their crystal structure, morphology, surface functional groups, elemental composition, specific surface area, porosity, and magnetic properties. Accordingly, the sample prepared without microwave treatment exhibited an amorphous structure, negligible magnetic response, and poor catalytic activity. In contrast, the microwave-treated samples, particularly those irradiated for 15–25 min, showed outstanding catalytic performance, achieving complete reduction of 4-nitroaniline to <i>p</i>-phenylenediamine in the presence of NaBH₄ within 75–180 s, which are attributed to the enhanced spinel phase contents, increased surface concentrations of Cu²⁺ and Fe³⁺ ions, high porosity, and large specific surface areas. These catalysts also demonstrated strong magnetic properties, enabling easy magnetic separation and reuse.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> CONCLUSION</h3>\u0000 \u0000 <p>The proposed coprecipitation–microwave treatment method offers a fast and low-energy approach to prepare highly active CuFe₂O₄ catalysts for the ultra-rapid reduction of 4-nitroaniline. The excellent catalytic performance, magnetic recoverability, and reusability of these samples highlight their great potential for water treatment applications. © 2025 Society of Chemical Industry (SCI).</p>\u0000 </section>\u0000 </div>","PeriodicalId":15335,"journal":{"name":"Journal of chemical technology and biotechnology","volume":"100 10","pages":"2163-2175"},"PeriodicalIF":2.4,"publicationDate":"2025-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145062816","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Application of Parachlorella kessleri for treatment of poultry processing wastewater: effect of temperature on nutrient removal rate and protein production","authors":"Luciani de L Souza,&nbsp;Everton Skoronski,&nbsp;Fábio de Farias Neves","doi":"10.1002/jctb.70022","DOIUrl":"10.1002/jctb.70022","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <h3> BACKGROUND</h3>\u0000 \u0000 <p>Wastewater produced from the thermal processing of poultry meat contains high levels of nitrogen and phosphorus. Thus, tertiary treatment is required to ensure that the wastewater meets Brazilian environmental regulations. Microalgae are capable of removing nutrients from wastewater and simultaneously synthesizing high-value biomolecules, such as proteins, which perform essential functions (structuring, energy reserve and bioactivity). However, microalgae are sensitive to temperature, which affects biomass productivity and the nutrient removal rate. The southern region of Brazil – where the present study was developed – has a temperate–subtropical climate, with periods of temperatures lower than 10 °C in winter, which may affect microalgal productivity and growth. The aim of the present study was to investigate the influence of temperature on nutrient removal from wastewater produced in a thermal poultry meat processing facility using a microalga-based process with <i>Parachlorella kessleri</i>. Biomass yield, nitrogen and orthophosphate removal efficiency and protein content were assessed at three temperatures (10, 20 and 30 °C) for 13 days.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> RESULTS</h3>\u0000 \u0000 <p>A yield of 0.049 ± 0.01 g L⁻¹ d⁻¹ was obtained at 20 °C. On the sixth day of cultivation, the ammonia removal rate was 98.79%. Orthophosphate was removed efficiently in all treatments, with rates higher than 90%. Average protein concentration did not differ significantly among the treatments.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> CONCLUSION</h3>\u0000 \u0000 <p>Monitoring temperature during wastewater treatment is key to understanding the underlying mechanism, especially for nutrient removal and the characterization of biomass. Further studies are needed on the ability of the microalga <i>Parachlorella kessleri</i> to remove orthophosphate over an ambient temperature range. © 2025 The Author(s). <i>Journal of Chemical Technology and Biotechnology</i> published by John Wiley &amp; Sons Ltd on behalf of Society of Chemical Industry (SCI).</p>\u0000 </section>\u0000 </div>","PeriodicalId":15335,"journal":{"name":"Journal of chemical technology and biotechnology","volume":"100 10","pages":"2136-2145"},"PeriodicalIF":2.4,"publicationDate":"2025-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://scijournals.onlinelibrary.wiley.com/doi/epdf/10.1002/jctb.70022","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145062447","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Synthesis of copper-nitrogen-carbon catalysts and the enhancement mechanism of mercury removal performance in coal-fired flue gas","authors":"Xin Wang,&nbsp;Dawei Hou,&nbsp;Zhen Zhang,&nbsp;Hao Wu","doi":"10.1002/jctb.70020","DOIUrl":"10.1002/jctb.70020","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <h3> BACKGROUND</h3>\u0000 \u0000 <p>Mercury pollution from coal-fired flue gas poses significant threats to human health and the ecosystem, prompting strict control measures under international conventions like the Minamata Convention. Existing flue gas treatment technologies (e.g., dust removal, desulfurization) have limited mercury removal efficiency, while activated carbon injection suffers from high costs and secondary treatment issues. Graphitic carbon nitride (g-C₃N₄) shows potential for mercury removal, and doping copper (Cu) atoms can enhance its performance. This study aimed to synthesize a Cu-N₄C catalyst via high-temperature calcination and explore its mercury removal mechanism in coal-fired flue gas.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> RESULT</h3>\u0000 \u0000 <p>The Cu-N₄C catalyst prepared at 800 °C showed remarkable mercury removal performance, with an average conversion of 98.50% at 50 °C and almost no Hg⁰ release, significantly outperforming conventional g-C₃N₄. It maintained high efficiency under various flue gas components, demonstrating strong resistance to interference from O₂, CO₂, NO, and SO₂. Structural characterization by XRD and FTIR confirmed the high crystallinity of Cu-N₄C and the impact of Cu doping on its chemical bonds, while SEM/EDX revealed a fluffy porous structure with uniform Cu distribution. N₂ adsorption–desorption tests showed that Cu-N₄C had a large specific surface area of 232 m²/g and a mesoporous structure, which enhanced the contact area with mercury. Mechanistic studies via Hg-TPD and XPS indicated that Cu⁺ in Cu-N₄C was oxidized to Cu²⁺ during the reaction, forming a Cu<span></span>Hg alloy with Hg⁰ to promote mercury removal through redox reactions and metal-mercury chemisorption.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> CONCLUSION</h3>\u0000 \u0000 <p>This study developed a novel Cu-N₄C catalyst for efficient mercury removal from coal-fired flue gas. The catalyst showed superior performance at low temperatures (50 °C) and maintained stability in complex flue gas environments. The mechanism involves Cu⁺-mediated oxidation of Hg⁰ to Hg²⁺ and formation of a Cu<span></span>Hg alloy. This work provides a new material option for industrial mercury removal and a theoretical basis for optimizing catalyst design. © 2025 Society of Chemical Industry (SCI).</p>\u0000 </section>\u0000 </div>","PeriodicalId":15335,"journal":{"name":"Journal of chemical technology and biotechnology","volume":"100 10","pages":"2094-2102"},"PeriodicalIF":2.4,"publicationDate":"2025-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145062547","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Exogenous acyl homoserine lactones modulate biofilm formation in Pseudomonas aeruginosa PFL-P1 and enhance phenanthrene degradation","authors":"Kumari Uma Mahto,&nbsp;Surajit Das","doi":"10.1002/jctb.70023","DOIUrl":"10.1002/jctb.70023","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <h3> BACKGROUND</h3>\u0000 \u0000 <p>Quorum sensing (QS) regulates several physiological behaviors in bacteria. Acyl homoserine lactones (AHLs) are self-synthesized auto-inducing molecules to form biofilm. Exogenous addition of AHLs can improve the bacterial community structure and biodegradation performance in wastewater treatment systems. However, the role of the QS-mediated interspecies interaction in phenanthrene degradation has been relatively less explored. There remains a notable research gap in understanding the effect of eavesdropping phenomena on biofilm formation, catabolic gene expression, and polycyclic aromatic hydrocarbon degradation in marine bacteria.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> RESULTS</h3>\u0000 \u0000 <p>Two non-cognate AHLs – <i>N</i>-hexanoyl-<span>dl</span>-homoserine lactone (C6-HSL) and <i>N</i>-3-oxo-octanoyl-<span>l</span>-homoserine lactone (3OC8-HSL) – showed affinity for LasR and RhlR QS systems in a marine bacterium, <i>Pseudomonas aeruginosa</i> PFL-P1. Exogenous supplementation of AHLs improved the specific biofilm formation (SBF) index, cell surface hydrophobicity, cell auto-aggregation, and motility. Further, the phenanthrene degradation potential of the organism increased from 85.18% to 93.82% in the presence of C6-HSL and 96.59% in the presence of 3OC8-HSL within 5 days. The biofilm-associated extracellular polymeric substances (EPS) showed high emulsification activity towards several hydrocarbons. The high binding constant (4.42 L mol⁻¹) and binding site number (1.38), indicating binding efficiency, suggested a strong interaction between EPS and phenanthrene. The exogenous addition of AHLs upregulated the expression of <i>lasI</i>, <i>rhlI</i>, and <i>pslB</i>. The phenanthrene catabolic gene, <i>nahAc</i>, was upregulated up to 3.07-fold (<i>P</i> &lt; 0.01) in the presence of C6-HSL and up to 4.7-fold in the presence of 3OC8-HSL (<i>P</i> &lt; 0.0001).</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> CONCLUSION</h3>\u0000 \u0000 <p>These findings suggest that QS-mediated enhancement of pollutant biodegradation is facilitated by improved biofilm formation and catabolic gene expression. © 2025 Society of Chemical Industry (SCI).</p>\u0000 </section>\u0000 </div>","PeriodicalId":15335,"journal":{"name":"Journal of chemical technology and biotechnology","volume":"100 10","pages":"2146-2162"},"PeriodicalIF":2.4,"publicationDate":"2025-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145062546","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Viscosity reduction of heavy oil through aquathermolysis catalyzed by piperazine metal complex clay composite and the mechanism study","authors":"Tuo Wei,&nbsp;Rui Guo,&nbsp;Youxu Liu,&nbsp;Ruoxi Yan,&nbsp;Jianxun Yu,&nbsp;Le Qu,&nbsp;Gang Chen","doi":"10.1002/jctb.70019","DOIUrl":"10.1002/jctb.70019","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <h3> BACKGROUND</h3>\u0000 \u0000 <p>Synergistic catalytic aquathermolysis represents a pivotal technology for heavy oil recovery, where the development, screening, and mechanistic understanding of composite catalysts play a central role. Although this approach demonstrates considerable scientific merit and practical utility, enhancing catalyst performance and economic viability remains an ongoing challenge.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> RESULTS</h3>\u0000 \u0000 <p>In this study, a series of novel composite catalysts were designed and synthesized using piperazine as the ligand and Na-montmorillonite as the carrier and applied to the aquathermolysis reaction system of heavy oil. The experimental results show that the S@Ni(II)P composite catalyst exhibits excellent synergistic catalytic performance: the viscosity reduction rate reaches 67.5% compared with the untreated oil sample and 57.4% compared with the blank aquathermolysis sample, while maintaining good catalytic stability. The viscosity reduction performance of the catalyst was systematically verified by characterization techniques such as Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy-energy dispersive spectroscopy (SEM-EDS), X-ray diffraction (XRD), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), elemental analysis, SARA analysis (saturates, aromatics, resins, asphaltenes), and gas chromatography (GC) of saturated hydrocarbons. In addition, based on the molecular structural characteristics of resins and asphaltenes in heavy oil, a model compound system was constructed in this study to deeply elucidate the synergistic catalytic mechanism of the S@Ni(II)P composite catalyst in the aquathermolysis process of heavy oil.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> CONCLUSION</h3>\u0000 \u0000 <p>This study successfully developed a highly efficient and stable composite catalyst that significantly enhanced the viscosity reduction effect in heavy oil aquathermolysis while elucidating its synergistic catalytic mechanism. The research not only provides an important experimental foundation for innovations in heavy oil recovery technology, but also offers scientific basis for theoretical development in this field. © 2025 Society of Chemical Industry (SCI).</p>\u0000 </section>\u0000 </div>","PeriodicalId":15335,"journal":{"name":"Journal of chemical technology and biotechnology","volume":"100 10","pages":"2118-2135"},"PeriodicalIF":2.4,"publicationDate":"2025-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145062585","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Ultrasound-assisted extraction with water of lyophilized camu-camu (Myrciaria dubia) resulted in high antioxidant and antimicrobial inhibition","authors":"Evelyn Diane Pereira,&nbsp;Daniel Vianey Cardoso,&nbsp;Edson Antônio da Silva,&nbsp;Carina Contini Triques,&nbsp;Erica Camila Pavan,&nbsp;Kátia Andressa Santos,&nbsp;Ricardo Fiori Zara,&nbsp;Jaqueline Hoscheid,&nbsp;Márcia Regina Fagundes-Klen","doi":"10.1002/jctb.70013","DOIUrl":"10.1002/jctb.70013","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <h3> BACKGROUND</h3>\u0000 \u0000 <p>In this study, lyophilized camu-camu (<i>Myrciaria dubia</i>) fruits were subjected to ultrasound-assisted extraction (UAE) using water, ammonia solution pH 9.5, and hexane. Each solvent was evaluated following a 2³ factorial experimental design to assess the effects of amplitude, solvent-to-solid ratio, and temperature on extract yield and antioxidant potential. The results were compared to those obtained by the conventional method of dynamic maceration (DM). The UAE times were 20 min for water and ammonia solution pH 9.5, and 30 min for hexane.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> RESULTS</h3>\u0000 \u0000 <p>The highest yield (47.78%) was reached with an amplitude of 90% for water, a solid-to-sample ratio of 22 mL g⁻¹, and a temperature of 35 °C for water. On average, UAE yielded approximately 26% more extract than DM, requiring only one-tenth of the extraction time, resulting in significantly lower energy consumption. Although all extracts exhibited antioxidant activity, the aqueous extract showed the highest value (3056 μmol TE·g⁻¹). Furthermore, it demonstrated stronger antimicrobial activity than ascorbic acid. High concentrations of ascorbic acid and phenolic compounds were also detected in the aqueous extract.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> CONCLUSION</h3>\u0000 \u0000 <p>When using water as a solvent, the best results were achieved enabling the comparison among different polarities and pH values. This result is advantageous from an economic and environmental point of view. In addition, the characteristics that the extract expressed showed that it can be used as a nutraceutical or even in the food industry, enabling an added value to the extract from this raw material. © 2025 Society of Chemical Industry (SCI).</p>\u0000 </section>\u0000 </div>","PeriodicalId":15335,"journal":{"name":"Journal of chemical technology and biotechnology","volume":"100 9","pages":"1956-1972"},"PeriodicalIF":2.4,"publicationDate":"2025-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144888313","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Electrifying CQDs-doped PANI-embedded membrane for enhanced self-cleaning targeting wastewater treatment","authors":"Ravi Ravi,&nbsp;Ayush Singh,&nbsp;Animes Kumar Golder","doi":"10.1002/jctb.70017","DOIUrl":"10.1002/jctb.70017","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <h3> BACKGROUND</h3>\u0000 \u0000 <p>Electrically conductive membranes have recently emerged as a promising solution, offering self-cleaning properties with reduced fouling. In this study, we synthesized electrically conductive polyaniline (PANI) and carbon quantum dots-doped PANI (CQDs/PANI) using <i>Piper longum</i> plant extracts and incorporated them into polysulfone/polyvinylpyrrolidone (PSF/PVP) membranes for improved self-cleanliness by minimizing membrane fouling.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> RESULTS</h3>\u0000 \u0000 <p>Optimized PANI and CQDs₄₀/PANI (with 40% CQDs) achieved notable electrical conductance of 513.4 ± 24.1 and 997.3 ± 29.7 μS, respectively. The incorporation of 2% PANI and CQDs₄₀/PANI into the membranes (denoted as PANI₂-PVP₂/PSF_12.5 and CQDs₄₀/PANI₂-PVP₂/PSF_12.5) enhanced membrane conductivity to 4.23 × 10⁻³ and 5.30 × 10⁻³ S cm⁻¹, respectively. The CQDs₄₀/PANI modification improved hydrophilicity and porosity (16.0 ± 1.2% to 66.1 ± 2.7%). The water flux of PVP₂/PSF_12.5, PANI₂-PVP₂/PSF_12.5 and CQDs₄₀/PANI₂-PVP₂/PSF_12.5 membranes was measured as 316.0 ± 9.3, 435.4 ± 11.9 and 485.7 ± 14.4 L m⁻² h⁻¹, respectively. Filtration of <i>E. coli</i> in phosphate buffer demonstrated significant fouling mitigation, with a reduced fouling from 69.1% to 49.3% and 34.5% for PANI- and CQDs₄₀/PANI-modified membranes, respectively, and flux recovery improved correspondingly, from 46.4% to 74.4% and 83.7% along with improved <i>E. coli</i> rejection from 63.7 ± 3.3% to 83.1 ± 2.9% and 96.5 ± 1.5%, respectively. <i>E. coli</i>-spiked sewage water filtration showed superior <i>E. coli</i> rejection (98.3 ± 2.3%) and fouling recovery (86.3 ± 2.1%) with lower fluxes than that of <i>E. coli</i>. Hagen–Poiseuille and resistance-in-series models showed &lt;15% variations in theoretical and experimental fluxes.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> CONCLUSION</h3>\u0000 \u0000 <p>The study achieved notable enhancement in the electrical conductivity, hydrophilicity and flux with the incorporation of CQDs/PANI. The developed membranes exhibit strong potential for mitigating fouling through an electrified self-cleaning mechanism, enhancing the efficiency of wastewater treatment. © 2025 Society of Chemical Industry (SCI).</p>\u0000 </section>\u0000 </div>","PeriodicalId":15335,"journal":{"name":"Journal of chemical technology and biotechnology","volume":"100 10","pages":"2078-2093"},"PeriodicalIF":2.4,"publicationDate":"2025-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145062490","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}