Journal of chemical technology and biotechnology最新文献

{"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}

{"title":"Solvent screening for the purification of monoterpenoids by countercurrent and centrifugal partition chromatography","authors":"Sérgio M Vilas-Boas,&nbsp;João AP Coutinho,&nbsp;Simão P Pinho,&nbsp;Olga Ferreira","doi":"10.1002/jctb.7762","DOIUrl":"https://doi.org/10.1002/jctb.7762","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <h3> BACKGROUND</h3>\u0000 \u0000 <p>Countercurrent chromatography (CCC) and centrifugal partition chromatography (CPC) are efficient techniques to purify terpenoids from essential oils. These methods require suitable solvent systems for the partition between the two immiscible liquid phases. In this study, using the analytical shake-flask method, we measured the partition coefficients of three model monoterpenoids, namely carvone, eucalyptol and thymol, in 11 biphasic solvent systems, at 298.2 K. Moreover, the predictive COSMO-RS model was applied to represent the partition coefficients of data measured in this work and retrieved from the literature, the liquid–liquid equilibrium (LLE) data of three solvent families suitable for CCC/CPC separations (i.e., Arizona, Modified Arizona and Green Arizona) and the solute's partition coefficients in the three solvent families.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> RESULTS</h3>\u0000 \u0000 <p>The partition coefficients obtained for thymol and eucalyptol are the first partition data available in the literature. The obtained root mean square deviations (RMSDs) between the experimental and predicted partition coefficients (log basis) varied between 0.28 and 0.49. For LLE, RMSDs of 0.040 and 0.048 were achieved for the Arizona and Green Arizona families, respectively.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> CONCLUSION</h3>\u0000 \u0000 <p>The predictive COSMO-RS model describes the monoterpenoid partition coefficients and the LLE data of the solvent families well. The most favorable solvent systems to perform the separations were identified, showing that systems with low and intermediate-to-low polarities are the most promising options for separating the selected monoterpenoids from their natural matrices by CCC/CPC techniques. © 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":"166-175"},"PeriodicalIF":2.8,"publicationDate":"2024-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142860416","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":"Cassava stem biochar (CSB) for chromium removal from produced water: sustainable adsorption and environmental implications","authors":"Vasu Gajendiran,&nbsp;Prabu Deivasigamani,&nbsp;Selvaraju Sivamani,&nbsp;Saikat Banerjee,&nbsp;B.S. Naveen Prasad","doi":"10.1002/jctb.7761","DOIUrl":"https://doi.org/10.1002/jctb.7761","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <h3> BACKGROUND</h3>\u0000 \u0000 <p>Produced water, a byproduct of oil and gas extraction, often contains elevated levels of heavy metals, including chromium, posing significant environmental and health risks. Cassava stem biochar (CSB) was prepared by pyrolysis of cassava stem and its potential has been investigated for the removal of chromium (Cr) from produced water. Batch adsorption experiments were conducted to evaluate the adsorption capacity of CSB under various conditions of pH, contact time, initial produced water concentration, adsorbent dosage, agitation speed, temperature and particle size.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> RESULTS</h3>\u0000 \u0000 <p>From the experiment results, it was found that CSB showed good adsorption capacity of chromium ions from produced water. The adsorption process was found to be highly pH-dependent, with maximum removal efficiency observed at a pH of 4.0. Equilibrium data were fitted to the Freundlich isotherm models, indicating multilayer adsorption on a heterogeneous surface. The kinetic data demonstrated that the adsorption process followed pseudo-first-order as well as pseudo-second-order kinetics, suggesting a physisorption and chemisorption mechanism. The thermodynamic parameters, including changes in enthalpy (ΔH), and entropy (ΔS), were evaluated to gain insights into the spontaneity and feasibility of the adsorption process. The negative ΔH values indicated that the adsorption of Cr onto CSB was non-spontaneous and exothermic in nature. The negative ΔS value suggested the adsorption is feasible.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> CONCLUSION</h3>\u0000 \u0000 <p>This comprehensive study demonstrates the potential of cassava stem biochar as an effective and environmentally friendly adsorbent for the removal of chromium from produced water. © 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":"155-165"},"PeriodicalIF":2.8,"publicationDate":"2024-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142860156","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":"Photocatalytic removal of aldrin and dieldrin using graphene oxide and TiO2-doped CuFe2O4","authors":"Sevil Akçağlar","doi":"10.1002/jctb.7759","DOIUrl":"https://doi.org/10.1002/jctb.7759","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <h3> BACKGROUND</h3>\u0000 \u0000 <p>Conventional treatment processes and existing photocatalysts have proven insufficient in efficiently removing aldrin and dieldrin. Consequently, this study aimed to investigate the removal of aldrin and dieldrin from surface water using a titanium dioxide/graphene oxide/copper ferrite (TiO₂/GO/CuFe₂O₄) nanocomposite.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> RESULTS</h3>\u0000 \u0000 <p>The highest photodegradation efficiencies for aldrin (100%) and dieldrin (99%) were achieved with a TiO₂/GO/CuFe₂O₄ nanocomposite dosage of 1.3 mg L⁻¹, at a sunlight intensity of 9 W m⁻² and an optimal photodegradation time of 25 min. The maximum UV absorption wavelength of the TiO₂/GO/CuFe₂O₄ nanocomposite was observed at 365 nm. The quantum yield of the nanocomposite was recorded as 2.69 × 10² mol einstein⁻¹, and its bandgap energy was determined to be 3.31 eV. The first-order kinetic rate constants for aldrin and dieldrin were calculated as 0.05 and 0.047 min⁻¹, respectively. X-ray diffraction analysis confirmed the crystal structure of CuFe₂O₄/TiO₂, while Fourier transform infrared spectroscopy detected carboxylic, epoxy, carbonyl and other oxygenated groups within the TiO₂/GO/CuFe₂O₄ nanocomposite. Scanning electron microscopy and transmission electron microscopy images revealed that CuFe₂O₄ was situated on the outer layer of GO. Energy-dispersive X-ray analysis identified the elemental composition of the TiO₂/GO/CuFe₂O₄ nanocomposite as comprising GO, C, Cu, Fe, Ti and O. A reusability study demonstrated that the nanocomposite maintained excellent performance, achieving 99% removal efficiency after 79 cycles and 97% after 100 cycles.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> CONCLUSIONS</h3>\u0000 \u0000 <p>The TiO₂/GO/CuFe₂O₄ nanocomposite effectively removed aldrin and dieldrin from surface water. This nanocomposite holds promise for the remediation of other aquatic ecosystems, such as bays, rivers and ocean waters. © 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":"138-154"},"PeriodicalIF":2.8,"publicationDate":"2024-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/jctb.7759","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142860152","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":"High-frequency (470 kHz) ultrasonics-assisted room temperature CO2 stripping and fate of Sono exposed solvent","authors":"Manikandan Shanmugam,&nbsp;Ambedkar Balraj,&nbsp;Ravichandar Babarao","doi":"10.1002/jctb.7763","DOIUrl":"https://doi.org/10.1002/jctb.7763","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <h3> BACKGROUND</h3>\u0000 \u0000 <p>The conventional CO₂ stripping process in solvent-based postcombustion CO₂ capture (PCCC) process uses heating to strip the CO₂ (~120 °C). However, the challenges associated with this method are high energy consumption in degassing the CO₂ from solvent, solvent loss and degradation resulting from the high –temperatures, resulting in high energy consumption typical of solvent-based PCCC. The present study demonstrates the use of bath-type sonication (470 kHz frequency) to remove CO₂ from CO₂ loaded 30 wt% Monoethanolamine under controlled temperature conditions. Solvent performance was evaluated following exposure to 2 h conventional heating and 75 h sonication.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> RESULTS</h3>\u0000 \u0000 <p>In a batch sono-assisted process, CO₂ stripping became possible at 17.5 °C compared to 102.2 °C using the conventional method. Increasing the sonication time led decreased carbon loading and increased stripping efficiency. The stripping rate was high at the initial stages of treatment. Evaluation of sono-exposed solvents exhibited decreased pH during CO₂ loading and decreased absorption capacity of the conventionally heated sample.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> CONCLUSION</h3>\u0000 \u0000 <p>The sono-assisted method consumes 3.57-foldless energy than conventional heating. Its CO₂ stripping rate was found to be higher within 5 min of sonication. Notably, the maximum temperature reached for the 1 h intervening mode of sonication at 470 kHz was 49.49 °C. The reduction in absorption capacity per hour of conventional heating was 24.5%, whereas for sonication it was &lt;0.4% and solvent loss was 19.7% lower than conventional. There was no significant change in the color, pH and density of the sample. A 20.4% higher surface tension than that of the virgin sample was observed. © 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":"176-186"},"PeriodicalIF":2.8,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142859898","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":"Gas–liquid mixing performance of a non-Newtonian fluid in a multiple-impeller agitated tank","authors":"Angus Shiue,&nbsp;Qiang Hu,&nbsp;Yu-Jie Ye,&nbsp;Jyh-Cheng Jeng,&nbsp;Graham Leggett","doi":"10.1002/jctb.7757","DOIUrl":"https://doi.org/10.1002/jctb.7757","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <h3> BACKGROUND</h3>\u0000 \u0000 <p>This target is to decide power input and gas hold-up for gas–liquid mixing aqueous CMC solutions. The analysis considers the impact by varying the impeller speed and gas flow rates in a stirred tank bioreactor of three kinds of multiple impellers. The effects of the impeller type, rheology, and operating conditions were investigated on power drawn, relative power demand (RPD), gas holdup, and volumetric mass transfer coefficient.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> RESULT</h3>\u0000 \u0000 <p>Compared to the Rushton turbine (6RT) and 4-pitch blade (4PBT) impeller, the propeller (3PP) impeller presented a minimal event of the gassing on the RPD. 4PBT impeller has shown a higher gas hold-up compared to the Rushton turbine and propeller impellers. The aerated agitated tank was established a dimensionless correlation for the RPD as a function of flow number and web number. Besides, the gas–liquid agitated system was also introduced a dimensionless correlation to compute the overall gas hold-up as a function of specific power consumption. For the maximum dispersion mixing intensity, the impeller structure with low RPD looks to be more adequate. Further, maximizing gas holdup in the structures with high RPD is advantageous. The effects of impeller speed, gas superficial velocity, and rheology on the volumetric mass transfer coefficient were examined.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> CONCLUSION</h3>\u0000 \u0000 <p>The volumetric mass transfer coefficient increased with an increase in impeller speed, gas superficial velocity, and power consumption per unit volume and decreased as rheology increased. The averaged kLa for each multiple-impeller was correlated well with the specific gassed power consumption and gas superficial velocity. © 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":"104-120"},"PeriodicalIF":2.8,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142859906","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":"Enhancing properties of PSF membrane via a simple two-step coating of PDA and PVP for separating oil/water emulsions","authors":"Rosyiela Azwa Roslan,&nbsp;Woei Jye Lau,&nbsp;Nadiene Salleha Mohd Nawi,&nbsp;Edward Ndumiso Nxumalo,&nbsp;Ahmad Fauzi Ismail","doi":"10.1002/jctb.7752","DOIUrl":"https://doi.org/10.1002/jctb.7752","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <h3> Background</h3>\u0000 \u0000 <p>Hydrophilic modification is a promising method to inhibit fouling formation on ultrafiltration membranes. Many relevant studies have been documented; however, most of these methods are either overly intricate or require costly chemicals, thus constraining their practical utility. In this work, we proposed a straightforward approach to modify a commercial polysulfone ultrafiltration membrane via a two-step coating process involving polydopamine (PDA) followed by polyvinylpyrrolidone (PVP). The influences of PVP molecular weight and concentration on the surface properties of the membrane were studied for oil/water emulsion treatment.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Results</h3>\u0000 \u0000 <p>Despite the fact that the introduction of a PVP layer adversely impacted the pure water permeability of the commercial membrane, its water flux during oil/water emulsion treatment was improved due to its improved antifouling properties, which can be attributed to a lower water contact angle. It was found that increasing the PVP concentration in the coating solution could improve the water flux and oil rejection during the treatment process. This enhancement is attributed to the augmented surface hydrophilicity combined with a reduction in membrane surface pore size. Additionally, the best-performing PVP-modified membrane exhibited significantly higher flux recovery rate, with its value for the second and third cycles at 89.4% and 80.4%, respectively, compared to the control membrane, which recorded 80.3% and 73.9%, respectively.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Conclusion</h3>\u0000 \u0000 <p>Modifying a membrane surface with PDA/PVP coating has been proven to enhance the surface wettability and antifouling properties significantly. These modifications led to improved oil removal efficiencies, demonstrating superior performance in oil/water emulsion treatment. © 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":"37-49"},"PeriodicalIF":2.8,"publicationDate":"2024-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142862021","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":"Adsorption behavior of graphite-like walnut shell biochar modified with ammonia for ciprofloxacin in aqueous solution","authors":"Qingkun Wang,&nbsp;Yanping Zhang,&nbsp;Fen Li,&nbsp;Wenxiao Liu,&nbsp;Liran Ma","doi":"10.1002/jctb.7756","DOIUrl":"10.1002/jctb.7756","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <h3> BACKGROUND</h3>\u0000 \u0000 <p>Graphite-like biochar of NWSC600K was prepared at 900 °C using walnut shell as the raw material and aqueous ammonia (NH₃·H₂O) as an activator, and characterized using transmission and scanning eletron microscopy (TEM, SEM), X-ray diffraction (XRD), Brunauer–Emmett–Teller (BET), Raman spectroscopy and Fourier transform infrared (FTIR). The study investigated the adsorption performance and mechanism of NWSC600K for ciprofloxacin (CIP).</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> RESULTS</h3>\u0000 \u0000 <p>The results showed that extremely tiny pores were found on the surface of NWSC600K, which increased its specific surface area to 823.91 m² g⁻¹, whereas the average pore size of NWSC600K decreased to 3.23 nm. The results of TEM, XRD and Raman spectroscopy detected well-arranged lattice stripes as well as characteristic peaks corresponding to the graphite lattice appearing on the surface of NWSC600K. Moreover, the <i>I</i>_D/<i>I</i>_G value for NWSC600K was 1.429. The FTIR results showed that functional groups including the amino group were formed on NWSC600K.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> CONCLUSION</h3>\u0000 \u0000 <p>The adsorption capacity of NWSC600K for CIP was 158.14 mg g⁻¹ and the corresponding removal rate was 97.5% at pH 7. The pH value impact on the removal efficiency of CIP greatly, and the removal rate of CIP decreased linearly with increasing pH. The coexisting ions also would inhibit the adsorption of CIP on NWSC600K. Results obtained from kinetic and isotherm models, thermodynamics and characterization analyses suggested that pore-filling, π–π stacking, hydrogen bonding, hydrophobicity and electrostatic interaction existed during the adsorption process. The adsorption was a nonspontaneous exothermic reaction. © 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":"90-103"},"PeriodicalIF":2.8,"publicationDate":"2024-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142257471","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}