Journal of chemical technology and biotechnology最新文献

{"title":"Sludge carbon promotes barium titanate piezoelectric property to activate persulfate degradation of enrofloxacin","authors":"Jun Chen, Xue Li, Xiaohong Yang, Yutong Wang, Zongsheng Zhan, Dawei Teng, Mingxia Du, Dong Lv, Kaiqi Yao, Chunnian Da, Mengqiu Xu","doi":"10.1002/jctb.7740","DOIUrl":"https://doi.org/10.1002/jctb.7740","url":null,"abstract":"BACKGROUNDPiezoelectric catalysis using perovskite‐type barium titanate (BaTiO<jats:sub>3</jats:sub>) has been applied to the decomposition of refractory organic pollutants through piezoelectric catalytic persulfate (PS). Nevertheless, challenges such as a limited specific surface area, poor electrical conductivity and a tendency towards agglomeration in BaTiO<jats:sub>3</jats:sub> necessitate the exploration of novel methods to enhance its piezoelectric efficiency.RESULTSSludge carbon (SC) from sewage treatment and BaTiO<jats:sub>3</jats:sub> was utilized to develop a novel piezoelectric catalytic material (BaTiO<jats:sub>3</jats:sub>/SC). The specific surface area of BaTiO<jats:sub>3</jats:sub>/SC reached 67.92 m<jats:sup>2</jats:sup> g<jats:sup>−1</jats:sup>, which is nine times larger than that of BaTiO<jats:sub>3</jats:sub> alone. The inclusion of SC in the composite enhanced the number of active sites and contributed to a higher degree of graphitization, improved electrical conductivity, and provided a more stable structure for BaTiO<jats:sub>3</jats:sub>/SC. This material was capable of harvesting mechanical vibration energy from ultrasound, thereby generating piezoelectric catalytic properties and activating PS to achieve a 93% decomposition ratio of enrofloxacin (ENR) in water within 80 min. The activation of PS by BaTiO<jats:sub>3</jats:sub>/SC piezocatalysis led to the production of reactive oxygen species (ROS), such as <jats:sup>•</jats:sup>OH and SO<jats:sub>4</jats:sub><jats:sup>−•</jats:sup>. These ROS attack the quinolone ring of ENR, which is susceptible to cleavage, resulting in the decomposition of ENR into intermediates of lower toxicity.CONCLUSIONThe incorporation of SC has enhanced the piezoelectric performance of BaTiO<jats:sub>3</jats:sub>, rendering BaTiO<jats:sub>3</jats:sub>/SC a novel perovskite‐type piezoelectric catalytic material that improves piezoelectric efficiency. The BaTiO<jats:sub>3</jats:sub>/SC system, through its piezoelectric catalytic activation of PS, demonstrates potential for decomposition of refractory organic pollutants in water treatment. © 2024 Society of Chemical Industry (SCI).","PeriodicalId":15335,"journal":{"name":"Journal of chemical technology and biotechnology","volume":null,"pages":null},"PeriodicalIF":3.4,"publicationDate":"2024-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142192091","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":"Rapid activation of PMS driven by bimetallic redox on transition metal selenides for sulfamethoxazole degradation: mechanism, degradation pathway and intermediates toxicity","authors":"Yongming Wang, Qiang Chen, Yuezong Su, Yuxuan He, Jin Qian, Kailin Xu","doi":"10.1002/jctb.7748","DOIUrl":"https://doi.org/10.1002/jctb.7748","url":null,"abstract":"BACKGROUNDThe increasing presence of antibiotics in aquatic environments poses significant ecological risks, with sulfamethoxazole (SMX) being a prominent example due to its persistence and widespread use in medical and veterinary practices. Advanced oxidation processes, particularly those based on peroxymonosulfate (PMS), have shown promise in degrading such contaminants. This work explored the efficacy of a bimetallic selenide catalyst, FeSe<jats:sub>2</jats:sub>/MoSe<jats:sub>2</jats:sub> (FM), synthesized via a hydrothermal method, for the rapid activation of PMS and subsequent degradation of SMX.RESULTSOver 95% SMX degradation was achieved with a 0.25 g/L catalyst dosage and 1.5 g/L PMS dosage, demonstrating that FM was an effective PMS activator capable of efficiently oxidizing SMX. The EPR tests and quenching experiments confirmed the presence of <jats:sup>1</jats:sup>O<jats:sub>2</jats:sub>, SO<jats:sub>4</jats:sub><jats:sup>•–</jats:sup> and <jats:sup>•</jats:sup>OH in the degradation system, with SO<jats:sub>4</jats:sub><jats:sup>•‐</jats:sup> predominating. The redox cycling of Mo with Fe was involved in the activation of PMS. Moreover, the DFT calculations of the SMX molecule revealed that the vulnerable sites were mainly in the vicinity of the sulfonamide group and the oxygen‐containing group. The toxicity assessment disclosed that most of the primary degradation intermediates of SMX were toxic, while the further small molecule products were non‐toxic.CONCLUSIONThis work underscores the potential of the FM/PMS system as an efficient and sustainable solution for degrading antibiotic contaminants like SMX in water. The low toxicity of the final degradation products further supports the environmental safety of this approach, making it a promising candidate for real‐world water treatment applications. © 2024 Society of Chemical Industry (SCI).","PeriodicalId":15335,"journal":{"name":"Journal of chemical technology and biotechnology","volume":null,"pages":null},"PeriodicalIF":3.4,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142192118","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":"Bismuth oxide nanoparticles as a promising adsorbent for removal of quetiapine: synthesis, characterization, and application","authors":"Tuba Dedecan, Nilay Baylan, İsmail İnci","doi":"10.1002/jctb.7742","DOIUrl":"https://doi.org/10.1002/jctb.7742","url":null,"abstract":"BACKGROUNDWithin the scope of this study, bismuth oxide (Bi<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub>) nanoparticles have been synthesized by a simple method, and the usability of these nanoparticles as adsorbents has been investigated. For this purpose, Bi<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub> nanoparticles were synthesized by a chemical method. These particles were characterized by various methods such as Fourier transform infrared spectroscopy, Brunauer–Emmett–Teller surface area, scanning electron microscopy, and X‐ray diffraction. The nature of the synthesized nanoparticles was confirmed by characterization results and the synthesized particles were found to be nanoscale. As a result of the characterization, the average particle diameters and surface areas were found to be 22.24, 32.24 and 49.98 nm, and 5.95, 3.54 and 0.75 m<jats:sup>2</jats:sup> g<jats:sup>−1</jats:sup> for different calcination temperatures of 105, 250 and 600 °C, respectively. Adsorption parameters such as initial quetiapine concentration, bismuth oxide nanoparticle dosage, temperature, equilibrium contact time, and pH were also studied. Moreover, kinetic, isotherm, and thermodynamics modeling of adsorption have been performed to account for the adsorption mechanism of quetiapine by Bi<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub> nanoparticles.RESULTSThe thermodynamic study has specified that adsorption has been spontaneous and exothermic. The kinetic study has pointed out that a pseudo‐second‐order model (<jats:italic>R</jats:italic><jats:sup>2</jats:sup> = 0.9853) has been favorable to the data. Furthermore, a Freundlich isotherm model (<jats:italic>R</jats:italic><jats:sup>2</jats:sup> = 0.8258) has been better fitted to the experimental adsorption results. The maximum adsorption capacity and percentage of adsorption values were 27.38 mg g<jats:sup>−1</jats:sup> and 76.81%, respectively.CONCLUSIONThe outcomes demonstrate that synthesized Bi<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub> nanoparticle is an influential adsorbent for removing quetiapine. Also, the obtained results enabled us to estimate the possibility of using Bi<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub> nanoparticles to remove active pharmaceutical ingredients by adsorption. © 2024 The Author(s). <jats:italic>Journal of Chemical Technology and Biotechnology</jats:italic> published by John Wiley &amp; Sons Ltd on behalf of Society of Chemical Industry (SCI).","PeriodicalId":15335,"journal":{"name":"Journal of chemical technology and biotechnology","volume":null,"pages":null},"PeriodicalIF":3.4,"publicationDate":"2024-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142192124","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":"Electrochemical synthesis of NaClO solutions on Ti/Pt electrodes in current reverse mode","authors":"Dmitry Girenko, Bohdan Murashevych, Pavlo Demchenko, Alexander Velichenko","doi":"10.1002/jctb.7741","DOIUrl":"https://doi.org/10.1002/jctb.7741","url":null,"abstract":"BACKGROUNDThe synthesis of sodium hypochlorite (NaClO) by classical electrolysis of NaCl solutions on a Ti/Pt anode is characterized by parallel formation of undesirable sodium chlorate (NaClO<jats:sub>3</jats:sub>) impurities. Oxidation of hypochlorite to chlorate with high current efficiency (CE) is realized on the oxidized, passivated Pt surface. On a Pt surface reduced by cathodic polarization, NaClO synthesis can be realized with the CE close to 90% almost without chlorate accumulation. Long‐term electrolysis leads to passivation of the Pt surface.RESULTSElectrolysis while periodically changing the polarity of the electrodes (current reverse mode) increases the time the Pt surface remains in the activated state. Carrying out electrolysis in this way makes it possible to increase CE(NaClO) 1.5–2.0‐fold while simultaneously reducing CE(NaClO<jats:sub>3</jats:sub>) (sodium chlorate) by ≤10‐fold. This study additionally determined the optimal parameters of reverse electrolysis, examined the effect of changing polarity on the state of the Ti/Pt electrode surface and studied the kinetic patterns of active platinum coating dissolution.CONCLUSIONThe optimal conditions for electrolysis in current reverse mode are current densities of 5–10 mA cm<jats:sup>−2</jats:sup> with the period of polarity change close to 30 s. The result of such a process is an isotonic solution containing 500 mg L<jats:sup>−1</jats:sup> NaClO with an admixture of &lt;10 mg L<jats:sup>−1</jats:sup> NaClO<jats:sub>3</jats:sub> and 0.1 mg L<jats:sup>−1</jats:sup> Pt in the form of soluble chloride complexes. The rate of Pt accumulation is determined by the frequency of polarity change. The resulting solutions have sufficiently high purity for use in medicine and aerosol air disinfection. © 2024 Society of Chemical Industry (SCI).","PeriodicalId":15335,"journal":{"name":"Journal of chemical technology and biotechnology","volume":null,"pages":null},"PeriodicalIF":3.4,"publicationDate":"2024-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142192120","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":"Phycoremediation: a path towards heavy metal bioremediation from wastewater","authors":"Naila Amel Agoun, Fatma Gizem Avci","doi":"10.1002/jctb.7745","DOIUrl":"https://doi.org/10.1002/jctb.7745","url":null,"abstract":"Heavy metals (HMs) have emerged as a significant and complex water pollution problem globally. These pollutants are particularly concerning due to their teratogenic, mutagenic, poisonous and carcinogenic properties, as well as their non‐biodegradability. Traditional removal techniques often fall short in addressing these issues, leading to a search for more effective solutions. One promising alternative is the phycoremediation process, which employs microalgae to remove HMs from wastewater. This method is not only cost‐effective but also environmentally friendly, offering the additional benefits of nutrient recovery from polluted water and conversion into value‐added products. This review delves into the capabilities of microalgae in remediating HM‐polluted water, examining the various factors and methods that affect the process. Key improvements that can enhance the efficiency of phycoremediation include immobilizing microalgae to increase their stability and longevity, utilizing binary cultures to harness synergistic effects and implementing cellular and genetic modifications to boost HM uptake and resilience. Moreover, the integration of algorithms and artificial intelligence can optimize phycoremediation processes by predicting and controlling environmental conditions, enhancing the precision and effectiveness of HM removal. The combination of these advanced strategies holds promise for overcoming the limitations of conventional methods, positioning phycoremediation as a viable solution for mitigating HM contamination in water bodies. © 2024 The Author(s). <jats:italic>Journal of Chemical Technology and Biotechnology</jats:italic> published by John Wiley &amp; Sons Ltd on behalf of Society of Chemical Industry (SCI).","PeriodicalId":15335,"journal":{"name":"Journal of chemical technology and biotechnology","volume":null,"pages":null},"PeriodicalIF":3.4,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142192122","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":"Synthesis of levulinic acid from tobacco stalk via steam explosion and oxidation–hydrolysis route","authors":"Hui Wang, Zhihao Chen, Zhongcheng Guo, Yangyang Ma, Xiaomei Yang, Lipeng Zhou, Chen Chen, Fayi Wang","doi":"10.1002/jctb.7746","DOIUrl":"https://doi.org/10.1002/jctb.7746","url":null,"abstract":"BACKGROUNDTobacco stalk, the main waste from tobacco planting, was used as raw material to produce levulinic acid, one of the most important platform chemicals. It was reported that steam explosion was an efficient method to treat lignocellulose to hydrolyze the hemicellulose component. Oxidation treatment combined with catalysis of Al<jats:sub>2</jats:sub>(SO<jats:sub>4</jats:sub>)<jats:sub>3</jats:sub> proved to be efficient for the conversion of cellulose to levulinic acid in our recent report. Here, tobacco stalk was first treated by steam explosion, and then the solid residue was oxidized and converted to levulinic acid in the presence of Al<jats:sub>2</jats:sub>(SO<jats:sub>4</jats:sub>)<jats:sub>3</jats:sub>.RESULTSA xylo‐oligosaccharide yield of 6.6 g 100 g<jats:sup>−1</jats:sup> was obtained from tobacco stalk via steam explosion. 15.4 g 100 g<jats:sup>−1</jats:sup> (39.6 mol%) yield of levulinic acid was obtained from oxidized tobacco stalk in water at 180 °C in 5 h using Al<jats:sub>2</jats:sub>(SO<jats:sub>4</jats:sub>)<jats:sub>3</jats:sub> as a catalyst. As high as 20.8 g 100 g<jats:sup>−1</jats:sup> (53.5 mol%) yield of levulinic acid can be obtained using NaCl as a co‐catalyst.CONCLUSIONSteam explosion was efficient for the depolymerization of the hemicellulose component of tobacco stalk to xylo‐oligosaccharide. A simple salt of Al<jats:sub>2</jats:sub>(SO<jats:sub>4</jats:sub>)<jats:sub>3</jats:sub> showed good catalytic activity for conversion of oxidized tobacco stalk to levulinic acid. Nicotine in tobacco stalk promoted the formation of lactic acid. Thus, the yield of levulinic acid decreased in the presence of nicotine. NaCl enhanced the catalytic performance of Al<jats:sub>2</jats:sub>(SO<jats:sub>4</jats:sub>)<jats:sub>3</jats:sub>. © 2024 Society of Chemical Industry (SCI).","PeriodicalId":15335,"journal":{"name":"Journal of chemical technology and biotechnology","volume":null,"pages":null},"PeriodicalIF":3.4,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142192121","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":"Exploring naphthalene vapor biofiltration: performance and microbial community dynamics with diverse inoculums","authors":"Jessica San Martín‐Davison, Raquel Lebrero, Christian Vergara‐Ojeda, Felipe Scott, Cesar Huiliñir, Alberto Vergara‐Fernández","doi":"10.1002/jctb.7744","DOIUrl":"https://doi.org/10.1002/jctb.7744","url":null,"abstract":"BackgroundNaphthalene is a polycyclic aromatic hydrocarbon, highly dangerous for human health. It is produced as a byproduct of incomplete combustion of organic material and is frequently present in the air. Biofilters offer an effective alternative for its treatment. The aim of this work was to study the treatment of naphthalene vapors through biofiltration using two biofilters: one inoculated with a consortium composed of <jats:italic>Fusarium solani</jats:italic> and <jats:italic>Rhodococcus erythropolis</jats:italic> (BF1), and the other inoculated with a consortium of microbial isolates obtained from a previous biofilter eliminating naphthalene vapors.ResultsThe results demonstrate that inoculating a biofilter with a reconstructed consortium of microbial isolates from a naphthalene vapor‐eliminating biofilter allowed a reduction of the startup time from 35 to 5 days, while maintaining a consistent removal capacity (6 g m<jats:sup>−3</jats:sup> h<jats:sup>−1</jats:sup>, equivalent to 80% removal efficiency). It was also observed that the biofilter inoculated with the reconstructed consortium exhibited comparable robustness to a biofilter previously operated for 4 months with naphthalene, with a maximum removal capacity of 14 g m<jats:sup>−3</jats:sup> h<jats:sup>−1</jats:sup> for a naphthalene inlet load of 17 g m<jats:sup>−3</jats:sup> h<jats:sup>−1</jats:sup>. The study of microbial communities indicates an increase in the bacterial variability, while fungal variability remains low, with <jats:italic>Fusarium solani</jats:italic> being predominant at 97%.ConclusionsResults obtained during the startup of both biofilters and by challenging biofilters to increasing naphthalene concentrations or decreasing empty bed residence time showed that startup time can be reduced sevenfold by selecting the microbial consortium. An equivalent performance, in the long run, was achieved for both biofilters. © 2024 Society of Chemical Industry (SCI).","PeriodicalId":15335,"journal":{"name":"Journal of chemical technology and biotechnology","volume":null,"pages":null},"PeriodicalIF":3.4,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142192123","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":"Synthesis of rGO/CuBi2O4 nanocomposite as an effective photocatalyst in the reduction of nitroaromatic compounds to corresponding amines under visible light","authors":"Elham Hosseinian,&nbsp;Ali Oji Moghanlou,&nbsp;Farshid Salimi Nanekaran,&nbsp;Behnam Khanizadeh,&nbsp;Nayer Mohammadian Tarighi","doi":"10.1002/jctb.7735","DOIUrl":"10.1002/jctb.7735","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <h3> BACKGROUND</h3>\u0000 \u0000 <p>Chemical pollutants, such as nitroaromatic compounds, have been a significant challenge in recent decades of human societies as they contribute to environmental pollution and pose serious health risks due to their high toxicity. One promising and green method to address this issue is the photocatalytic reduction of nitroaromatic compounds to their corresponding amino aromatic compounds. In this study, an rGO/CuBi₂O₄ nanocomposite was synthesized using the hydrothermal method, involving the simultaneous reduction of graphene oxide and the coupling of CuBi₂O₄ nanoparticles in its layers. The resulting heterogeneous structure was characterized using various techniques including FTIR, Raman, XPS, XRD, FESEM, TEM, EDAX, UV–Vis DRS, BET, PL spectroscopy, and EIS. Subsequently, the photocatalytic efficiency of the nanocomposite in reducing nitroaromatic compounds to the corresponding aromatic amines under visible light was evaluated.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> RESULTS</h3>\u0000 \u0000 <p>The results indicated that graphene oxide was effectively reduced and coupled with CuBi₂O₄ nanoparticles in the reduced graphene oxide sheets. The rGO/CuBi₂O₄ heterogeneous nanocomposite successfully reduced nitroaromatic compounds to the corresponding aromatic amines under visible light. Hydrazine monohydrate was used to supply the necessary hydrogen for the reaction.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> CONCLUSION</h3>\u0000 \u0000 <p>This study confirmed the high photocatalytic activity of the rGO/CuBi₂O₄ heterogeneous nanocomposite. Our nanocomposite was more effective than others, reported in similar studies, at reducing nitroaromatic compounds to the corresponding amino aromatic compounds. Additionally, it demonstrated high recycling and reuse properties, as there was no significant change in reaction conversion percentage and nanocomposite amount after 16 reuses. © 2024 Society of Chemical Industry (SCI).</p>\u0000 </section>\u0000 </div>","PeriodicalId":15335,"journal":{"name":"Journal of chemical technology and biotechnology","volume":null,"pages":null},"PeriodicalIF":2.8,"publicationDate":"2024-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142192125","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":"Paracetamol sensing with a flexible graphene paper electrode modified with MnCo2O4","authors":"Murad Shafiyev, Elif Erçarıkcı, Kader Dağcı Kıranşan, Ezgi Topçu","doi":"10.1002/jctb.7739","DOIUrl":"https://doi.org/10.1002/jctb.7739","url":null,"abstract":"BACKGROUNDThe design of new‐generation flexible sensors for medical applications has gained considerable interest in the research community in recent past years. Herein, a free‐standing flexible electrode was developed for the electrochemical determination of Paracetamol (PC). This graphene‐based paper electrode was prepared using graphene and MnCo<jats:sub>2</jats:sub>O<jats:sub>4</jats:sub> dispersion with a mold‐casting method followed by chemical reduction. The morphology and structure of our flexible paper electrode (MnCo<jats:sub>2</jats:sub>O<jats:sub>4</jats:sub>/GP) were characterized by scanning electron microscopy, energy‐dispersive, X‐ray diffraction, X‐ray photoelectron, and Raman spectroscopy.RESULTSThe as‐prepared flexible MnCo<jats:sub>2</jats:sub>O<jats:sub>4</jats:sub>/GP showed outstanding sensing performance for PC, as compared to GP, due to the excellent electrochemical properties of MnCo<jats:sub>2</jats:sub>O<jats:sub>4</jats:sub>. The proposed sensor exhibited a wide linear range of 4.64–1000 μM for electrochemical determination of PC with a low detection limit of 1.39 μM. Furthermore, MnCo<jats:sub>2</jats:sub>O<jats:sub>4</jats:sub>/GP was successfully applied for PC syrup and tablets with good accuracy results.CONCLUSIONSFor the first time, the present study demonstrated the fabrication and utilization of MnCo<jats:sub>2</jats:sub>O<jats:sub>4</jats:sub>‐modified graphene paper to develop a flexible and sensitive electrode for monitoring PC. © 2024 The Author(s). <jats:italic>Journal of Chemical Technology and Biotechnology</jats:italic> published by John Wiley &amp; Sons Ltd on behalf of Society of Chemical Industry (SCI).","PeriodicalId":15335,"journal":{"name":"Journal of chemical technology and biotechnology","volume":null,"pages":null},"PeriodicalIF":3.4,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142192126","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":"Engineered hybrid iron‐cobalt metal oxide nanoparticles for effective adsorption of malachite green dye","authors":"Nasira Hussain, Shanza Shafaat, Ambreen Sarfraz, Muhammad Usman, Muhammad Saqib Khan, Asad Muhammad Khan, Rafaqat Ali Khan, Bilal Ahmad Zafar Amin, Muhammad Bilal, Ahson Jabbar Shaikh","doi":"10.1002/jctb.7737","DOIUrl":"https://doi.org/10.1002/jctb.7737","url":null,"abstract":"BACKGROUNDHybrid iron and cobalt metal oxide nanoparticles are well known; however, are not optimized in terms of size and stability. We engineered these hybrid nanoparticles using the co‐precipitation method and characterized them by various techniques, which are then used for the effective adsorption and removal of malachite green (MG) dye.RESULTSThe ideal conditions for synthesis are determined to be 50:50 ratio of Fe<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub> and CoO, pH of 11, temperature range of 40 °C–60 °C, and reactant addition time of 20 min. These hybrid nanoadsorbents effectively eliminated MG dye from aqueous solutions. Factors such as initial MG dye concentration, pH of the medium, contact time, temperature, and nanoadsorbent dose were optimized for the MG removal to achieve a maximum removal efficiency of 96.9%. Non‐linear fitting of data indicates that both Langmuir and Freundlich models provided the best fit, suggesting the presence of both monolayer and multilayer adsorption of MG on hybrid nanoparticles. The kinetics of MG dye removal are better controlled by the intraparticle diffusion (IPD) phenomenon. The adsorption of MG onto the hybrid nanoparticles was confirmed to be endothermic, with negative ΔG and positive ΔH values. The optimized synthetic conditions also positively impacted the hybrid nanoparticles which enhanced the adsorption and exhibited ferromagnetic behavior as compared to the superparamagnetic behavior reported in the literature, making them significantly important for dye removal applications.CONCLUSIONThese findings demonstrate the potential of optimized hybrid nanoparticles as effective nanoadsorbents for dye removal applications, with implications for further applications in photocatalysis and sensing. © 2024 Society of Chemical Industry (SCI).","PeriodicalId":15335,"journal":{"name":"Journal of chemical technology and biotechnology","volume":null,"pages":null},"PeriodicalIF":3.4,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142192156","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}