Journal of chemical technology and biotechnology最新文献

{"title":"Production of a fungal aspartic protease via solid-state fermentation using a rotating drum bioreactor","authors":"Farhat Qasim,&nbsp;Sonja Diercks-Horn,&nbsp;Lisa-Marie Herlevi,&nbsp;Hector Marcelo Fernandez-Lahore","doi":"10.1002/jctb.7772","DOIUrl":"https://doi.org/10.1002/jctb.7772","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <h3> BACKGROUND</h3>\u0000 \u0000 <p>Solid-state fermentation (SSF) has gained attention recently as a promising approach for producing a range of high-value industrial products. SSF has several benefits, including a high product yield, a lesser chance of contamination, a resemblance to some fungi and bacteria's native environment, a lower energy need, and cost-effectiveness. Additionally, the enzyme extraction from concentrated solutions facilitates the recovery procedure. <i>Mucor racemosus,</i> a filamentous fungus, has the potential to produce a milk-clotting enzyme (aspartic protease) cultivated on various combinations of the solid media to investigate the effect of media on the production and activity of the milk-clotting enzyme.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> RESULTS</h3>\u0000 \u0000 <p>The fermentation was scaled up by utilizing Terrafors-IS Infors HT <i>in-situ</i> sterilizable rotating solid-state bioreactor to cultivate the fungus. The effect of agitation (rotation on the day of inoculation and day 1), aeration (air flow rates of 1 L and 2 L/min), and moisture content (60% and 90%), during SSF were investigated. The profiles of various operational parameters (that is, temperature, pressure, flow rate, exit O₂, and exit CO₂) were monitored using the provided software, and data were collected at 10-min intervals during the whole course of fermentation. The results suggest that aeration has a remarkable effect on the quantity of biomass produced, but it doesn't assure high enzyme production. The highest milk clotting activity of ~570 U/mL was recorded with a moisture content of 60% and a flow rate of 1 L/min.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> CONCLUSION</h3>\u0000 \u0000 <p>A high yield of ~570 U/mL of the enzyme with desired characteristics was obtained with minimum moisture availability at low temperatures. The results narrated in this study validate the SSF process for producing aspartic protease from wheat bran using a rotating solid-state bioreactor to be used as a potential milk coagulant in the cheese industry. © 2024 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 1","pages":"273-285"},"PeriodicalIF":2.8,"publicationDate":"2024-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/jctb.7772","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142862290","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":"Efficient treatment of printing and dyeing reverse osmosis concentrate by a Ti-NTA/SnO2-Sb2O3 electrocatalytic membrane","authors":"Chengjie Li,&nbsp;Yinghui Mo,&nbsp;Liang Wang,&nbsp;Heng Guo,&nbsp;Xiaoxue Ji","doi":"10.1002/jctb.7769","DOIUrl":"https://doi.org/10.1002/jctb.7769","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <h3> BACKGROUND</h3>\u0000 \u0000 <p>Printing and dyeing reverse osmosis concentrates (ROC) contain large amounts of salts and organic matter, which is a major environmental issue. The unique composition of such wastewater makes the use of traditional physicochemical techniques challenging.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> RESULTS</h3>\u0000 \u0000 <p>In this paper, titanium dioxide nanotube arrays/SnO₂-Sb₂O₃ (Ti-NTA/SnO₂-Sb₂O₃) electrodes were prepared by anodizing–cathodizing and sol–gel method for the electrocatalytic degradation of printing and dyeing ROC. Organic matter removal under different situations was examined, and the best treatment parameters were identified.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> CONCLUSION</h3>\u0000 \u0000 <p>Following treatment, organic matter concentration dropped from 1600 to 50 mg L⁻¹, or even less. The outstanding removal performance of the Ti-NTA/SnO₂-Sb₂O₃ electrode was validated by full-scan ultraviolet spectra, gas chromatography–mass spectrometry and three-dimensional fluorescence. Evaluation of the dissolved heavy metals and halogenated degradation process byproducts revealed that the electrocatalytic membranes were environmentally safe. These findings highlight the enormous potential of electrocatalytic membranes for the treatment of high-salt ROC when equipped with a Ti-NTA/SnO₂-Sb₂O₃ electrode. © 2024 Society of Chemical Industry (SCI).</p>\u0000 </section>\u0000 </div>","PeriodicalId":15335,"journal":{"name":"Journal of chemical technology and biotechnology","volume":"100 1","pages":"255-265"},"PeriodicalIF":2.8,"publicationDate":"2024-10-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142862277","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":"Heteropolyacids combined with Y zeolite as superior solid acid catalysts to accelerate lactic acid esterification","authors":"Cui Quan,&nbsp;Yingying Zhou,&nbsp;Hua Chu,&nbsp;Xiaolei Fan,&nbsp;Ningbo Gao","doi":"10.1002/jctb.7768","DOIUrl":"https://doi.org/10.1002/jctb.7768","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <h3> BACKGROUND</h3>\u0000 \u0000 <p>Ethyl lactate produced via esterification between lactic acid and ethanol can be used in plastics, polymers and food industries and renowned for its biodegradability and low toxicity. However, lactic acid self-catalyzed esterification presents a slow reaction process, and acid catalysts are needed to improve the catalysis. Homogeneous acid catalysts like H₂SO₄ are corrosive, as well as being difficult to be seperated from the reaction media; therefore, advanced heterogeneous catalysts are more ideal. In this study, two kinds of heteropolyacid–zeolite catalysts, involving loading silicotungstic acid and phosphotungstic acid onto Y zeolite, were synthesized, characterized using X-ray diffraction, NH₃ temperature-programmed desorption and scanning electron microscopy and analyzed for their catalytic efficiency in the catalytic esterfication.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> RESULTS</h3>\u0000 \u0000 <p>Results showed that the Keggin structures of heteropolyacids were retained during the preparation process and strong acid sites of Y zeolite were enriched, which made the main contribution to the esterification of lactic acid and ethanol. Furthermore, the initial-stage reaction rate of esterification was significantly enhanced. During the first hour of esterification, the conversion of lactic acid increased from 18% to 65%. Exp Dec1 index model was employed to determine the activation energies of 60HSiW-Y and 60HPW-Y, which exhibit values of 29.3 and 28.2 kJ mol⁻¹, respectively.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> CONCLUSION</h3>\u0000 \u0000 <p>This study indicates that Keggin structures of heteropolyacids play a key role in the esterification and heteropolyacid–zeolite catalysts can effectively catalyze the esterification. Meanwhile, the results of the kinetic experiments can be of reference significance for large-scale industrial processes involving esterification. © 2024 Society of Chemical Industry (SCI).</p>\u0000 </section>\u0000 </div>","PeriodicalId":15335,"journal":{"name":"Journal of chemical technology and biotechnology","volume":"100 1","pages":"243-254"},"PeriodicalIF":2.8,"publicationDate":"2024-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142862078","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":"Assessment of the oxygen dynamics in microalgae–bacteria systems through respirometry","authors":"Marcos Sales,&nbsp;Lourdinha Florêncio,&nbsp;Germán Buitrón","doi":"10.1002/jctb.7771","DOIUrl":"https://doi.org/10.1002/jctb.7771","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <h3> BACKGROUND</h3>\u0000 \u0000 <p>A microalgae–bacteria consortium applied to the treatment of domestic wastewater can be an alternative to reduce the energy consumption of aerobic systems if the algal biomass produces enough oxygen for bacterial consumption. This study proposed to evaluate the microalgal production of photosynthetic O₂ and consumption by heterotrophic organic matter-removing and autotrophic nitrifying bacteria through respirometric tests.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> RESULTS</h3>\u0000 \u0000 <p>Aggregates composed of predominantly spherical green microalgae and bacteria were formed in a photosequencing batch reactor, with 6 h cycles, and fed with synthetic domestic wastewater. Biomass reached 800 mgVSS L⁻¹ and chlorophyll-a content of 4 mg gVSS⁻¹. Photosynthetic oxygen production reached 33.4 mgO₂ gSS⁻¹ h⁻¹. Through respirometric tests and oxygen mass balance, oxygen consumption rates by ordinary heterotrophic bacteria (5.9 mgO₂ gSS⁻¹ h⁻¹), ammonia-oxidizing bacteria (8.67 mgO₂ gSS⁻¹ h⁻¹) and nitrite-oxidizing bacteria (0.78 mgO₂ gSS⁻¹ h⁻¹) were obtained.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> CONCLUSION</h3>\u0000 \u0000 <p>Photosynthetic oxygen production was 28% higher than the total O₂ required by bacteria. Under the conditions studied, an artificial oxygen supply would not be necessary since the algal biomass can supply the bacterial O₂ demand. © 2024 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 1","pages":"266-272"},"PeriodicalIF":2.8,"publicationDate":"2024-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/jctb.7771","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142861938","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":"Removal of impurities from industrial hydrogen peroxide using carbon-based adsorbents","authors":"Neda Hamzehzad Yoneslouei,&nbsp;Seyyed Salar Meshkat,&nbsp;Alireza Behroozsarand,&nbsp;Arash Afghan","doi":"10.1002/jctb.7765","DOIUrl":"https://doi.org/10.1002/jctb.7765","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <h3> BACKGROUND</h3>\u0000 \u0000 <p>Adsorption is a widely used technique for separating impurities in various industries. This method offers flexibility in design and operation and results in the production of high-quality purified wastewater. This experimental research investigates the effectiveness of carbon-based adsorbents, such as graphene, graphene oxide and carbon dots, in removing impurities and increasing hydrogen peroxide concentration through adsorption.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> RESULTS</h3>\u0000 \u0000 <p>Various characterization techniques were used to investigate each adsorbent's chemical properties and surface morphology, including Fourier transform infrared spectroscopy, X-ray diffraction, field emission scanning electron microscopy, transmission electron microscopy and Brunauer–Emmett–Teller analysis. According to adsorption tests under the defined conditions, the synthesized graphene showed the highest efficiency in impurities removal from hydrogen peroxide, with purity level of 45%. Graphene showed higher efficiency than graphene oxide and carbon dot samples, with a purity of 36% and 32%, respectively. Various factors, such as time, temperature and adsorbent dosage, were investigated at different stages of the experiments. The results show that the adsorption of impurities on carbon-based adsorbents is an exothermic process.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> CONCLUSION</h3>\u0000 \u0000 <p>It was shown that graphene structure results in an adsorption capacity of up to 147.06 mg g⁻¹, which was increased by 45% in comparison to graphene oxide and carbon dot as adsorbents. To gain further insights, isothermal and kinetic experiments on the adsorption of hydrogen peroxide were performed. The results indicate compliance with the Freundlich isotherm, suggesting multilayer adsorption and pseudo-second-order kinetics. © 2024 Society of Chemical Industry (SCI).</p>\u0000 </section>\u0000 </div>","PeriodicalId":15335,"journal":{"name":"Journal of chemical technology and biotechnology","volume":"100 1","pages":"202-214"},"PeriodicalIF":2.8,"publicationDate":"2024-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142861758","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":"Correction to “Single-use centrifugal separator enables intensification of the clarification process in biomanufacturing of recombinant proteins”","authors":"","doi":"10.1002/jctb.7760","DOIUrl":"https://doi.org/10.1002/jctb.7760","url":null,"abstract":"<p>\u0000 <span>Agarwal, H.</span>, <span>Thwin, C.</span>, &amp; <span>Kumaar, B. T.</span> (<span>2023</span>). <span>Single-use centrifugal separator enables intensification of the clarification process in biomanufacturing of recombinant proteins</span>. <i>Journal of Chemical Technology &amp; Biotechnology</i>, <span>98</span>(<span>5</span>), <span>1321</span>–<span>1332</span>.</p><p>In Table 3, under the column <i>Scenario B</i> and row <i>Bioreactor viability (%)</i>, instead of ≥80%, it should be &lt;80%.</p><p>We apologize for this error.</p>","PeriodicalId":15335,"journal":{"name":"Journal of chemical technology and biotechnology","volume":"100 1","pages":"286"},"PeriodicalIF":2.8,"publicationDate":"2024-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/jctb.7760","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142861379","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":"A perspective on alignment between steady-state design and control for a distillation system in the context of flexibility analysis","authors":"Zong Yang Kong,&nbsp;Tiffany Ang,&nbsp;Vincentius Surya Kurnia Adi,&nbsp;Jaka Sunarso","doi":"10.1002/jctb.7770","DOIUrl":"https://doi.org/10.1002/jctb.7770","url":null,"abstract":"<p>This perspective paper discusses the alignment between steady-state design and control (dynamic) simulation in the context of flexibility analysis for distillation systems. Operational variations, such as fluctuations in feed composition or flowrate, can stem from external factors like raw material quality or temperature variations. These disturbances need to be mitigated to ensure optimal industrial performance. Traditionally, these process uncertainties are usually considered in a sequential manner, where the steady-state flowsheet is established first, and control performance is analyzed afterwards. However, recent studies have started integrating flexibility index into the design phase to account for process uncertainties. While this integration has improved design strategies, aligning steady-state and dynamic control simulations for comprehensive flexibility analysis remains underexplored. In this paper, we wish to share new perspectives and insights we have observed by analyzing the existing literature. We highlight some points not immediately apparent in our previous studies, hoping these insights will serve as guidelines for future research in this direction. We believe that validating results between steady-state and control simulations is a long-term endeavor that cannot be conclusively addressed soon. However, we hope this paper will be valuable to future researchers, contributing to advancing this field and reaching those who will appreciate and build upon these insights. © 2024 Society of Chemical Industry (SCI).</p>","PeriodicalId":15335,"journal":{"name":"Journal of chemical technology and biotechnology","volume":"100 1","pages":"6-12"},"PeriodicalIF":2.8,"publicationDate":"2024-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142861208","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":"Ni phosphide catalysts on Al2O3-zeolite prepared by phosphidation for methyl palmitate hydroconversion","authors":"Ivan V Shamanaev,&nbsp;Evgenia N Vlasova,&nbsp;Dmitriy E Tsaplin,&nbsp;Irina G Danilova,&nbsp;Vera P Pakharukova,&nbsp;Evgeny Yu Gerasimov,&nbsp;Ilya V Yakovlev,&nbsp;Alexey Yu Fedorov,&nbsp;Anton L Maximov,&nbsp;Galina A Bukhtiyarova","doi":"10.1002/jctb.7766","DOIUrl":"https://doi.org/10.1002/jctb.7766","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <h3> BACKGROUND</h3>\u0000 \u0000 <p>One-stage hydroconversion of fatty-acid based feedstocks is a promising way to obtain high-quality fuels. This process is based on hydrodeoxygenation, isomerization and hydrocracking reactions. In this work, Ni₂P/Al₂O₃-zeolite catalysts were synthesized and tested in hydroconversion of a model compound – methyl palmitate.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> RESULTS</h3>\u0000 \u0000 <p>Ni₂P catalysts were prepared by <i>in situ</i> phosphidation of metallic Ni/Al₂O₃-zeolite precursors by PPh₃. Mixtures of zeolite (30 wt%) and boehmite were peptized and extruded to obtain the support granules. SAPO-11, ZSM-5, ZSM-22, ZSM-23 and ZSM-12 were used as a zeolite component. The catalysts and supports were characterized by a range of physicochemical methods: chemical analysis (ICP-AES), low-temperature N₂ adsorption, H₂-temperature programmed reduction, NH₃-temperature programmed desorption, Fourier transform infrared spectroscopy of adsorbed CO, X-ray diffraction, transmission electron microscopy, X-ray photoelectron spectroscopy, and ²⁷Al and ³¹P magic angle spinning nuclear magnetic resonance. The catalysts were studied in methyl palmitate hydroconversion (one-stage hydrodeoxygenation-isomerization-hydrocracking) in a continuous-flow fixed bed reactor at 290–340 °C, 2 MPa, H₂/feed = 600 Ncm³/cm³ and LHSV = 5.3 h⁻¹. SAPO-11 containing sample showed high selectivity to C15 and C16 iso-alkanes (63%, at 340 °C), and all ZSM-containing samples showed high selectivity to cracked C5–C9 products (55–100%, at 340 °C) with varying amounts of iso-alkanes (31–57%, at 340 °C).</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> CONCLUSION</h3>\u0000 \u0000 <p>The results show that by choosing the zeolite component of the catalyst it is possible to finely tune product quality in the range from low-temperature diesel fuel to jet fuel or gasoline. © 2024 Society of Chemical Industry (SCI).</p>\u0000 </section>\u0000 </div>","PeriodicalId":15335,"journal":{"name":"Journal of chemical technology and biotechnology","volume":"100 1","pages":"215-230"},"PeriodicalIF":2.8,"publicationDate":"2024-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142860640","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":"Composite adsorbent of Terminalia catappa fruit shell-derived activated carbon and chitosan for enhanced removal of chromium(VI): kinetics, thermodynamics, equilibrium and adsorption mechanism","authors":"My Linh Nguyen,&nbsp;Thanh Tung Nguyen,&nbsp;Thi Tuyet Trinh Nguyen,&nbsp;Nha Truc T. Chau,&nbsp;Hoang Long Ngo,&nbsp;Anh T.K. Tran,&nbsp;Ruey-Shin Juang","doi":"10.1002/jctb.7767","DOIUrl":"https://doi.org/10.1002/jctb.7767","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <h3> BACKGROUND</h3>\u0000 \u0000 <p>Chromium, which is widely employed in many industries, has a high toxicity. In this research, activated carbon derived from <i>Terminalia catappa</i> fruit shells was combined with chitosan (TCAC-CS) to enhance adsorption capability of hexavalent chromium [Cr(VI)] in wastewater.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> RESULTS</h3>\u0000 \u0000 <p>Different Cr(VI) adsorption parameters were investigated. Two isotherm and two kinetic models were employed to understand the adsorption mechanism. The thermodynamic characteristics of Cr(VI) adsorption, namely the Gibbs free energy change (ΔG), enthalpy change (ΔH) and entropy change (ΔS), also were computed. The best adsorption capability was achieved at pH 3, adsorbent dose 2.5 g L⁻¹, temperature 35 °C and initial Cr(VI) concentration 50 mg L⁻¹. The Cr(VI) adsorption capacity reached 184.45 mg g⁻¹, as fitted by the Langmuir isotherm, which is superior when compared to most biomass-based carbonaceous adsorbents. The negative ΔG value shows the spontaneous nature of the Cr(VI) adsorption process on the TCAS-CS. Additionally, Fourier transform infrared characterization confirmed that the incorporation of chitosan to activated carbon resulted in chemical adsorption of Cr(VI) via chelating instead of sole physical adsorption via hydrogen bonding, which greatly improved the adsorption ability of the materials.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> CONCLUSION</h3>\u0000 \u0000 <p>TCAC-CS demonstrated potential utilization as an efficient, low-cost and environmentally friendly adsorbent in the removal of Cr(VI) from wastewater. © 2024 Society of Chemical Industry (SCI).</p>\u0000 </section>\u0000 </div>","PeriodicalId":15335,"journal":{"name":"Journal of chemical technology and biotechnology","volume":"100 1","pages":"231-242"},"PeriodicalIF":2.8,"publicationDate":"2024-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142860641","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":"A comprehensive investigation of oxygen/graphite carbon nitride smart Nano coatings for sustainable maintenance and sacrificial anode protection of mild steel","authors":"Ashraf Morsy,&nbsp;Monica Toderas,&nbsp;Adel El-marghany,&nbsp;Dipak Rana,&nbsp;Mahmoud Abdelaty,&nbsp;Fathy Shokry,&nbsp;M.E. Mohamed,&nbsp;D.E. Abd-El-Khalek,&nbsp;Mai.I. Elkaliuoby,&nbsp;Elsayed G Blall","doi":"10.1002/jctb.7764","DOIUrl":"https://doi.org/10.1002/jctb.7764","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <h3> BACKGROUND</h3>\u0000 \u0000 <p>This study enhancing the corrosion resistance of mild steel (MS) by incorporating photo-catalyst-doped graphitic carbon nitride (g-C₃N₄) nano-sheets containing silver (Ag) and oxygen (O₂) into a solar light-active photoelectrochemical anticorrosion paint with polyester (PE). The objective is to provide sacrificial anode protection through visible light activation.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> RESULTS</h3>\u0000 \u0000 <p>The developed paint forms a uniform film on the MS surface, effectively providing anodic protection under visible light. Characterization techniques, including energy-dispersive X-ray spectroscopy (EDX), transmission electron microscopy (TEM), Fourier-transform infrared spectroscopy (FTIR), and UV–Vis spectroscopy, confirm the molecular structure of the nano-sheets. Corrosion resistance, assessed through weight loss measurements and open circuit potential (OCP) tests, shows significant improvement with the addition of Ag/g-C₃N₄ and Ag-O₂/g-C₃N₄ nano-sheets at an optimized concentration of 15 mg. The protection efficiency is ranked as follows: O₂-g/C₃N₄ &gt; O-g/C₃N₄ &gt; Ag-O₂/g-C₃N₄ &gt; Ag-g/C₃N₄ &gt; g-C₃N₄. After 28 days of immersion in seawater, MS coated with O₂/g-C₃N₄ exhibited the least weight loss, with an inhibition efficiency of up to 99%. Electrochemical impedance spectroscopy (EIS) further demonstrated enhanced coating resistance for the O₂/g-C₃N₄ coating (Rct = 3.76 kΩ.cm², Rcoat = 1.69 kΩ.cm²) compared to pure PE (Rct = 0.005 kΩ.cm², Rcoat = 0.096 kΩ.cm²).</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> CONCLUSION</h3>\u0000 \u0000 <p>The synthesized O₂/g-C₃N₄ and Ag-O₂/g-C₃N₄ nano-sheets exhibit high surface areas and enhanced water dispersibility, which contribute to significant corrosion protection of MS. The electrochemical performance, including weight loss and OCP measurements, highlights the potential of these nano-sheet photo-catalysts in advancing corrosion resistance technologies, with broad implications for materials science and engineering applications. © 2024 Society of Chemical Industry (SCI).</p>\u0000 </section>\u0000 </div>","PeriodicalId":15335,"journal":{"name":"Journal of chemical technology and biotechnology","volume":"100 1","pages":"187-201"},"PeriodicalIF":2.8,"publicationDate":"2024-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142860189","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}