Current Research in Green and Sustainable Chemistry最新文献

{"title":"Phase separation behaviour during direct solvent extraction of Corynebacterium glutamicum fermentation broth – Systematic study of crud suppression","authors":"Jörg Eberz ,&nbsp;Lara Strehl ,&nbsp;Marcel Mann ,&nbsp;Andreas Jupke ,&nbsp;Jørgen Barsett Magnus","doi":"10.1016/j.crgsc.2025.100448","DOIUrl":"10.1016/j.crgsc.2025.100448","url":null,"abstract":"<div><div>The economic competitiveness of bio-based production processes is often hindered by the high costs associated with downstream processing, compared to fossil-based methods. Liquid-liquid extraction is a widely used technique for aqueous fermentation systems and offers significant cost-saving potential, especially if extraction could be performed directly from the fermentation broth without prior cell separation. However, this is often hindered by the formation of \"crud\" — a deposit or emulsion at the interface between two partially settled phases. This study investigates the liquid-liquid phase separation of <em>Corynebacterium glutamicum</em> DM 1933 fermentation broths using five different solvents. We systematically examined the impact of cell surface properties, modified through nutrient concentration, on crud formation. In addition, the variation in salt concentration and pH after fermentation was analysed. Our findings show that the present nutrient concentration influences the cell surface properties and, consequently, crud formation. A more hydrophilic cell surface was present at a lower phosphate concentration, whereas a more hydrophobic cell surface was measured for a lower nitrogen and iron concentration. With a more hydrophobic cell surface, the fermentation broth showed a large crud phase, while a decrease in crud formation could be seen for fermentation broths with a more hydrophilic cell surface. Furthermore, the crud formation is influenced by the pH, cell and salt concentration and strongly by the used solvent.</div></div>","PeriodicalId":296,"journal":{"name":"Current Research in Green and Sustainable Chemistry","volume":"10 ","pages":"Article 100448"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143548532","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Facile preparation of zeolite Na–P supported by nanozinc oxide for antibacterials","authors":"Sakesit Duangkham ,&nbsp;Rattana Pengproh ,&nbsp;Pattaranun Thuadaij","doi":"10.1016/j.crgsc.2025.100459","DOIUrl":"10.1016/j.crgsc.2025.100459","url":null,"abstract":"<div><div>This research presents facile and short-time synthesis of zeolite Na–P supported by nanozinc oxide (nano-ZnO), demonstrating significant progress in developing antibacterial agents. Zeolites Na–P synthesized from Narathiwat kaolinite and silica derived from sugarcane bagasse ash were prepared by refluxing at 100 °C for 8 h. The zeolites Na–P were then functionalized with nano-ZnO in concentrations of 1 % w/w, 3 % w/w, and 5 % w/w in an ultrasound bath at 70 °C for 15 min and stirred with 1400 rpm at 70 °C for 3 h to form nanocomposites. The composites were characterized using X-ray diffraction, Fourier-transform infrared spectroscopy, and scanning electron microscopy, which confirmed the successful integration of nano-ZnO without affecting the crystal structure of the zeolites. The antibacterial efficacy of the synthesized nanocomposites against various gram-positive and gram-negative bacteria, including <em>Staphylococcus aureus</em> and <em>Escherichia coli</em>, was evaluated using the disc diffusion method. The zeolites loaded with 3 % w/w nano-ZnO exhibited the highest antibacterial activity, outperforming the other formulations. The potential of zeolites Na–P is supported by nano-ZnO as a highly effective antibacterial agent, which has important implications for applications in healthcare and environmental remediation.</div></div>","PeriodicalId":296,"journal":{"name":"Current Research in Green and Sustainable Chemistry","volume":"10 ","pages":"Article 100459"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144089619","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Exploring biogenic/ green solvents on the sustainable development of metal organic frameworks for waste water treatment","authors":"Rajeev Agrawal ,&nbsp;Urmila Chakraborty ,&nbsp;Saurabh Singh","doi":"10.1016/j.crgsc.2025.100462","DOIUrl":"10.1016/j.crgsc.2025.100462","url":null,"abstract":"<div><div>The application of metal organic frameworks (MOFs) in the field of wastewater treatment has gained significant scientific focus in the recent years. However, the use of hazardous solvents during the synthesis of MOFs restrains their large scale synthesis and industrial level applications. Thus green and safer solvents are required, which can efficiently replace the toxic solvents conventionally used during the synthesis of MOFs. The application of cleaner green solvents can cause drastic alleviation in the toxic wastes produced from the industrial scale synthesis of MOFs. Many green solvents (bio-derived and non-bio-derived) have found their applications in different areas of scientific research. Green solvents, such as water, super critical CO₂, ionic liquids, deep-eutectic solvents, certain alcohols, gamma-valerolactone and cyrene have been efficiently explored for the synthesis of different types of MOFs suitable for waste water treatment. This review highlights the application of these solvents for the engineering of MOFs for water treatment. The research works from the last eight years (2018–2025) involving the use of suitable biogenic/green solvents for the synthesis of MOFs specifically applicable for water/wastewater treatment applications have been reviewed intricately for the first time. The challenges associated with the application of these solvents have been presented in detail. The recent strategies adopted by the researchers to overcome the existing challenges and obtain high quality MOFs in these solvents have been discussed.</div></div>","PeriodicalId":296,"journal":{"name":"Current Research in Green and Sustainable Chemistry","volume":"10 ","pages":"Article 100462"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144106641","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A green templated and nitrogen-incorporated SAPO-34 catalyst for enhanced MTO performance","authors":"Mohammad Javad Emami,&nbsp;Jafar Towfighi Darian,&nbsp;Masoud Safari Yazd","doi":"10.1016/j.crgsc.2025.100463","DOIUrl":"10.1016/j.crgsc.2025.100463","url":null,"abstract":"<div><div>This study presents a nitrogen-modified SAPO-34 catalyst (SPG), synthesized via a green templated method using coffee powder, to improve the efficiency and stability of the methanol-to-olefins (MTO) process. Compared to conventional SAPO-34 (SP), SPG demonstrates enhanced selectivity, stability, and longevity. Characterization shows a smaller crystallite size (38 nm vs. 46 nm), increased nitrogen incorporation, and well-distributed active sites, improving catalytic activity. Optimized acidity in SPG enhances methanol conversion while reducing coke formation. MD simulations reveal that nitrogen modification improves methanol retention and adsorption energy, promoting ethylene production. Performance tests show SPG achieving 92.6 % light olefin selectivity for 360 min, outperforming SP. Additionally, SPG exhibits superior hydrothermal stability and reduced coke deposition, making it a promising eco-friendly and cost-effective catalyst for industrial MTO applications.</div></div>","PeriodicalId":296,"journal":{"name":"Current Research in Green and Sustainable Chemistry","volume":"10 ","pages":"Article 100463"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144155086","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Comparative analysis of the response surface methodology (RSM) and artificial neural network (ANN) modelling for the removal of diclofenac potassium from synthesized pharmaceutical wastewater using a palm sheath fiber nano-filtration membrane and optimization","authors":"Modestus O. Anusi ,&nbsp;Mathew C. Menkiti ,&nbsp;Alexander I. Ikeuba ,&nbsp;Chigoziri N. Njoku ,&nbsp;Chukwuma E. Iloegbunam ,&nbsp;Chinaza J. Nnamani ,&nbsp;Anselem C. Orga","doi":"10.1016/j.crgsc.2025.100466","DOIUrl":"10.1016/j.crgsc.2025.100466","url":null,"abstract":"<div><div>Palm sheath fiber obtained from the petiole of palm tree leaf was defatted and characterized by X-ray diffraction (XRD), revealing a crystalline composition of 75 % calcite, 10.5 % quartz, 4 % periclase, and 10.2 % lime. Further analysis of pore area, volume, and diameter confirmed the membrane as an adsorptive nanofiltration material. A stock solution of Diclofenac potassium was prepared and was filtered varying four process factors: temperature (30–50 °C), pH (6–10), flow-rate (1–5 ml/min), and initial concentration (40–120 mg/L). The removal efficiency of Diclofenac Potassium was analyzed and compared using two optimization models; Methodology (RSM) and Artificial Neural Networks (ANN), focusing on the influence of these factors. The performance and sensitivity of these models were assessed using statistical metrics such as correlation coefficients (R²), Absolute Average Relative Deviation (AARD), and Mean Absolute Error (MAE). Both models demonstrated strong correlation with the experimental data, with the ANN model providing the best predictive accuracy. Optimization of the process via genetic algorithms yielded the optimal membrane removal efficiency of 84.78 %, achieved at initial concentration (102 mg/L), pH (8.8), temperature (40.6 °C), and flow rate (3.6 ml/min). The validation of these optimized parameters was carried out through triplicate experiments, resulting in an average confirmatory removal efficiency of 84.67 %, which validated the ANN prediction. Additionally, adsorption isotherm analysis revealed that the Dubinin-Radushkevich (D-R) model was the best fit for the experimental data, with an R² value of 0.9839. The adsorption kinetics suggested that the process followed pseudo-first-order kinetics as the rate-limiting mechanism.</div></div>","PeriodicalId":296,"journal":{"name":"Current Research in Green and Sustainable Chemistry","volume":"11 ","pages":"Article 100466"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144330608","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Tofu Wastewater Recovery for β-glucan Production by Pichia norvegensis and Candida tropicalis","authors":"Deidita Nafisa Wahyudi ,&nbsp;Gemilang Lara Utama ,&nbsp;Andri Frediansyah","doi":"10.1016/j.crgsc.2025.100445","DOIUrl":"10.1016/j.crgsc.2025.100445","url":null,"abstract":"<div><div>This study aims to determine the applicability of tofu wastewater as a medium for yeast growth and to determine the optimal growth time of yeast to produce β-glucans, as well as the yield and characteristics of β-glucans extract. <em>Pichia norvegensis</em> and <em>Candida tropicalis</em> cell walls were extracted for β-glucan. FTIR, solid-state NMR, and SEM were utilized to investigate purity, structural differences, and antioxidant activity. <em>Candida tropicalis</em> (BCT) yielded 3.20 % crude β-glucan, while <em>Pichia norvegiensis</em> NYI (BPN) yielded 2.10 %. FTIR showed β-glucan impurities in mannoprotein-chitosan combinations. BPN and BCT have β-glucan bands at 1075, 1041, and 894 cm⁻¹. The impurity of both samples was confirmed by NMR spectra, which showed that the broad signal of BPN and BCT chemical shift at 4.803–4.587 ppm and at 4.764–4.541 ppm, respectively, corresponded to l β-1,3-glucosidic and β-1,6-glucosidic linkage, with some unusual anomeric resonance at 5.094–5.024 ppm by SEM, BPN and BCT were porous, sheet-like, and fibrous. BPN had 20.07 % DPPH radical scavenging activity, while BCT had 36.01 %.</div></div>","PeriodicalId":296,"journal":{"name":"Current Research in Green and Sustainable Chemistry","volume":"10 ","pages":"Article 100445"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143167773","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Optimization, derivatization and characterization of mango waste cellulose (Mangifera indica) and its use for the production of composite nanofibers","authors":"Amet Ovando-Roblero ,&nbsp;María Celina Luján-Hidalgo ,&nbsp;Rocío Meza-Gordillo ,&nbsp;Rosa Isela Cruz-Rodríguez ,&nbsp;Zaira Domínguez ,&nbsp;Ricardo Vera-Graziano ,&nbsp;Elisa Miranda Buendía ,&nbsp;Karla K. Gómez-Lizárraga","doi":"10.1016/j.crgsc.2025.100453","DOIUrl":"10.1016/j.crgsc.2025.100453","url":null,"abstract":"","PeriodicalId":296,"journal":{"name":"Current Research in Green and Sustainable Chemistry","volume":"10 ","pages":"Article 100453"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143828922","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Microwave-assisted synthesis of ZSM-5 from blast furnace slag","authors":"Nhlanhla Nyembe ,&nbsp;Yusuf M. Isa","doi":"10.1016/j.crgsc.2025.100455","DOIUrl":"10.1016/j.crgsc.2025.100455","url":null,"abstract":"<div><div>A rapid hydrothermal synthesis method was employed to prepare a novel Zeolite Socony Mobil-5 (ZSM-5) material impregnated with intrinsic metal alloys (Fe₂O₃, MnO, TiO₂, Cr₂O₃, and NiO). Green chemistry was paired with the synthesis method as a sustainable approach to valorize blast furnace slag (BFS) while addressing the growing demand for high-performance zeolites. This study investigated the role of acid-leached BFS as a precursor and explored the advantages of microwave-assisted hydrothermal synthesis over conventional methods. The synthesis temperature and time were varied to explore their effects on the physicochemical, textural, and structural properties of the synthesized ZSM-5 products, with commercial ZSM-5 serving as a reference material for comparison. The favourable synthesis conditions were found to be 180 °C and 13 h, yielding a crystalline ZSM-5 product characterized by well-defined cubic prism shapes with microsized intergrown rectangular crystals. Furthermore, the synthesized ZSM-5 had a mesoporous structure with an average crystallinity of 52.4 % and a low specific surface area (108.4 m²/g) compared to the reference sample (436.4 m²/g). The use of microwave irradiation significantly reduced the synthesis time and energy consumption while preserving the structural integrity of the zeolite framework. Moreover, the synthesis temperature strongly affected the crystal size, while the synthesis time affected the morphology. However, neither the synthesis temperature nor the synthesis time affected the chemical composition of the products. This study highlighted the potential of BFS as a low-cost, sustainable feedstock for zeolite synthesis and the effectiveness of microwave-assisted methods in improving process efficiency. Further work has been proposed to evaluate the potential use of the synthesized ZSM-5 in industrial applications such as catalysis or adsorption processes.</div></div>","PeriodicalId":296,"journal":{"name":"Current Research in Green and Sustainable Chemistry","volume":"10 ","pages":"Article 100455"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143870440","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"2-Aminopyridine as a recyclable catalyst for metal-free synthesis of pyrano[2,3-d]pyrimidine scaffolds","authors":"Farzaneh Mohamadpour","doi":"10.1016/j.crgsc.2024.100444","DOIUrl":"10.1016/j.crgsc.2024.100444","url":null,"abstract":"<div><div>This study focuses on the synthesis of pyrano[2,3-<em>d</em>]pyrimidine structures through a one-pot process without the use of metals. The method employs Knoevenagel-Michael cyclocondensation and utilizes a low-cost, reusable catalyst, 2-aminopyridine. The synthesis of pyrano[2,3-<em>d</em>]pyrimidine structures is achieved by refluxing in ethanol (EtOH). The process allows for the easy production of compounds in large quantities and requires minimal reaction time. This cost-effective method features safe reaction conditions, avoids the need for column chromatography, facilitates easy mixing, and promotes efficient material use. Furthermore, 2-aminopyridine demonstrated excellent stability, being reusable up to four times without significant degradation. This approach is particularly beneficial for addressing environmental issues and fulfilling industrial demands.</div></div>","PeriodicalId":296,"journal":{"name":"Current Research in Green and Sustainable Chemistry","volume":"10 ","pages":"Article 100444"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143168424","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Enhancing sustainable silk Textiles: Optimization of teak leaf extract dyeing and antibacterial efficacy","authors":"Nattadon Rungruangkitkrai ,&nbsp;Rattanaphol Mongkholrattanasit ,&nbsp;Peeraya Ounu ,&nbsp;Nawarat Chartvivatpornchai ,&nbsp;Jirachaya Boonyarit ,&nbsp;Kamlai Laohaphatanaleart ,&nbsp;Rungsima Chollakup","doi":"10.1016/j.crgsc.2025.100457","DOIUrl":"10.1016/j.crgsc.2025.100457","url":null,"abstract":"<div><div>This study introduces an environmentally friendly method for dyeing silk using pigments extracted from young teak leaves (<em>Tectona grandis</em> L.), offering a sustainable solution to reduce pollution from synthetic dyes while repurposing agricultural waste. Ethanol (95 %) extraction of teak leaves showed a rich in polyphenols and quinonoid compounds, which yielded a reddish-brown pigment suitable for dyeing. Key dyeing conditions, including temperature (30–100 °C), duration (10–60 min), and pH (3–11), were optimized to maximize color absorption and uniformity. Color performance was evaluated through spectrophotometry (L∗, a∗, b∗ values) and K/S measurements. Three mordants including alum (aluminum potassium sulfate), ferrous sulfate, and stannous chloride were tested using pre-, meta-, and post-mordanting techniques. Pre-mordanting with ferrous sulfate delivered the darkest shades and highest color intensity, along with excellent wash and light fastness (rated ≥4 on the Grey scale). FTIR spectroscopy revealed stable dye-mordant complexes formed through molecular coordination. The dyed silk exhibited mild antibacterial properties against <em>Staphylococcus aureus</em> and <em>Escherichia coli</em> in agar well diffusion tests, though inhibition zones were modest (&lt;0.20 cm), likely due to residual bioactive compounds. These results position teak leaf extract as a multifunctional natural dye, combining aesthetic, ecological, and hygienic advantages. By aligning with circular economy principles, this approach presents a viable pathway for sustainable textile production. Nonetheless, future research should focus on optimizing extraction methods, boosting antimicrobial efficacy, and scaling the process for industrial applications.</div></div>","PeriodicalId":296,"journal":{"name":"Current Research in Green and Sustainable Chemistry","volume":"10 ","pages":"Article 100457"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144070935","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}