Journal of Chemical Technology and Biotechnology
0268-2575
1097-4660
Anh Quốc
Cơ quản chủ quản: WILEY , John Wiley and Sons Ltd
Lĩnh vực:
Chemical Engineering (miscellaneous)PollutionInorganic ChemistryBiotechnologyFuel TechnologyOrganic ChemistryWaste Management and DisposalRenewable Energy, Sustainability and the Environment
Phân tích ảnh hưởng
Thông tin về tạp chí
Journal of Chemical Technology and Biotechnology (JCTB) is an international, inter-disciplinary peer-reviewed journal concerned with the application of scientific discoveries and advancements in chemical and biological technology that aim towards economically and environmentally sustainable industrial processes. JCTB publishes research papers, reviews, mini-reviews, perspectives and spotlights in both electronic and printed formats. Online procedures provide efficient submission and peer-review. EarlyView provides online publication in advance of the print edition.
Các bài báo tiêu biểu
High efficiency microbial electrosynthesis of acetate from carbon dioxide using a novel graphene–nickel foam as cathode Abstract BACKGROUND Microbial electrosynthesis (MES) is a biocathode‐driven process, producing high‐value chemicals, from CO2 . However, the low efficiency of the biocathode hinders the MES process efficiency significantly. RESULTS A novel 3D graphene–nickel foam (G‐NF) cathode has been fabricated, by hydrothermal approach for the improvement of microbially‐catalyzed reduction at the MES cathode. An increase of 1.8 times in the volumetric acetate production rate was obtained, compared with the untreated nickel foam. In MES with G‐NF, a volumetric acetate production rate of 3.11 mmol L‐1 day‐1 has been achieved; 70% of the electrons consumed were recovered and the final acetate concentration reached 5.46 g L‐1 within 28 days. CONCLUSION The hierarchical porous G‐NF cathode improved bacterial colonization and the efficiency of mass, nutrients and protons transfer due to its 3D composition; the graphene coating considerably increased the effective surface area for microbial adhesion, as well as the electron transfer rate of biofilm in the MES. This study attempted to improve the efficiency of the biocathode, and provides a promising large electrode for large‐scale MES devices. © 2017 Society of Chemical Industry
Tập 93 Số 2 - Trang 457-466 - 2018
Moisture sorption characteristics of waste activated sludge Abstract Nowadays the treatment of activated sludge often includes a thermal drying step. Data such as water vapour sorption isotherms and heat of sorption are required for good design and control of the drying processes. An equilibrium method was used to measure these data on domestic activated sludge, between 39 °C and 80 °C. The experimental investigation indicated that the nature of the sludge and its evolution (bulking sludge, anaerobic storage) do not affect the sorption isotherms. Experimental data were fitted to different well‐known models; the Oswin relationship gave the better fit. Based on sorption data the heat of sorption as a function of moisture content was determined. © 2001 Society of Chemical Industry
Tập 76 Số 4 - Trang 377-382 - 2001
Valorization of Zante currant side‐streams for the production of phenolic‐rich extract and bacterial cellulose: a novel biorefinery concept Abstract BACKGROUND Utilization of renewable resources for the production of added‐value bioeconomy products, within the concept of developing integrated biorefineries, is a crucial step towards the establishment of sustainable processes. In this framework, a novel biorefinery has been proposed based on ‘Zante currant’ side‐stream valorization. RESULTS ‘Zante currant’ raisins discarded during the production process were initially treated in order to obtain a sugar‐rich and a phenolic‐rich fraction, implementing wastewaters for all of the extraction and dilution procedures. Total phenolics and antioxidant activity index (AAI) were determined indicating that Zante currants could be considered as a phenolic‐rich source, whereas the fractionated phenolic extract possesses a moderate antioxidant activity (AAI = 0.71). In addition, quantitative analyses using high performance liquid chromatography‐diode array detector revealed that the main phenolics present in Zante currants were caffeic acid, ellagic acid, 4‐hydroxybenzaldehyde, catechin and rutin; homoprotocatechuic acid, epicatechin, vanillic acid and gallic acid also were detected in lower concentrations. Likewise, sugar recovery reached 88% and the sugar‐rich stream was subsequently utilized in batch fermentations for the production of bacterial cellulose (BC), using the bacterial strain Komagataeibacter sucrofermentans DSM 15973. The obtained results showed that BC was produced efficiently, reaching higher concentrations (2.76 g L−1 ) than previous studies in which synthetic fructose‐ and glucose‐based media were used. CONCLUSION This is the first study proposing the development of a novel raisin‐based biorefinery for the production of added‐value products, namely antioxidants and BC. © 2019 Society of Chemical Industry
Tập 95 Số 2 - Trang 427-438 - 2020
Performance of different advanced oxidation processes for tertiary wastewater treatment to remove the pesticide acetamiprid Abstract BACKGROUND This work studied the performance of different advanced oxidation processes (AOPs ) as tertiary treatment for removal of the pesticide acetamiprid from water. Specifically, UV , UV /TiO2 , UV /H2 O2 /Fe, and two systems with persulfate (PS ), UV /PS and UV /PS /Fe, were evaluated. RESULTS The study was carried out in deionised water, synthetic water from a secondary effluent and real effluent from a conventional activated sludge effluent (CAS effluent). In addition, the effect of humic acids, lignin‐derivative and lauryl sulphate was investigated as organic matter that affects AOP efficiency. CONCLUSIONS Photo‐Fenton at natural pH proved to be the most efficient process in all matrices. The persulfate systems have also shown that they have great potential for micropollutant removal. It was found that humic acids reduced degradation efficiency for UV /H2 O2 /Fe and UV /PS /Fe due to competition with radicals. Humic acids had a negative impact on UV photolysis at high concentration due to the absorptivity of UV light. Lignin had a negative effect on AOPs that used iron, forming Fe(II )‐complexes with high absorptivity which act as a light filter. For lauryl sulphate, its chemical structure did not favour the formation of iron complexes at natural pH , resulting in similar degradation rates for UV /H2 O2 /Fe, UV /H2 O2 , UV /PS and UV /PS /Fe. © 2014 Society of Chemical Industry
Tập 91 Số 1 - Trang 72-81 - 2016
Recovery of palladium from secondary waste using soluble tannins cross-linked<i>Lagerstroemia speciosa</i>leaves powder
Tập 92 Số 7 - Trang 1667-1677 - 2017
Stability of <i>Lactobacillus bulgaricus</i> immobilized in K‐carrageenan gels Abstract The future application of immobilized microorganism techniques will depend on the development of systems which are technologically applicable on an industrial scale. These techniques must permit high microbial concentrations and must allow mass transfer to take place with low diffusional limitations. In addition, the mechanical separation of the immobilized microorganisms must be achieved economically, K ‐carrageenan was used as an ionotropic gel carrier for the immobilization of Lactobacillus bulgaricus (ATCC 11842), and the effects of gel stability on productivity and the rate of product formation were investigated. K ‐carrageenan gels had higher mechanical and chemical stability than alginate gels. The storage stability of microorganisms immobilized in K ‐carrageenan was good enough to retain biocatalytic activity during prolonged storage at 4°C.
Tập 53 Số 2 - Trang 173-175 - 1992
Activated carbon surface modifications by adsorption of bacteria and their effect on aqueous lead adsorption Abstract The adsorption of Escherichia coli on different activated carbons has been studied. The activated carbon samples used have been characterized, determining their surface area, pore size distribution, elemental analysis, mineral matter analysis and pH of the point of zero charge. The adsorption capacity of these carbons increased with their hydrophobicity and macropore volume. The number of bacteria adsorbed on the demineralized activated carbon in a solution of pH value equal to the iso‐electric point of the carbon was negligible. However, in the presence of cations the proportions of bacterial cells adsorbed were 87.8% (Fe3+ ), 54.7% (Ca2+ ) and 24.8% (Mg2+ ) respectively. This increase in adsorption capacity in the presence of electrolytes has been explained on the basis of both the reduction in electrostatic free energy and the increase in cell surface hydrophobicity due to the metal bound by some compounds of the cell membrane. When the solution pH was intermediate between the pH values of the point of zero charge of the carbon and bacteria the number of bacteria adsorbed increased due to the attractive interactions between the carbon and bacteria. The adsorption of bacteria on activated carbons decreased the porosity and increased the negative charge density of the latter. Depending on the experimental conditions used, the presence of bacteria can enhance the capacity of activated carbons to adsorb lead. © 2001 Society of Chemical Industry
Tập 76 Số 12 - Trang 1209-1215 - 2001
Effective impregnation for the preparation of magnetic mesoporous carbon: application to dye adsorption Abstract BACKGROUND In this study, magnetic mesoporous activated carbons were synthesized either via co‐precipitation of iron salts onto activated carbon or via impregnation of activated carbon with magnetic nanoparticles by sonication. The resulting impregnated carbons were examined as adsorbents for the removal of Reactive Black 5 (RB5 ) from aqueous solutions. RESULTS The magnetic nanocomposites were characterized by various techniques (nitrogen adsorption, Fourier transform infrared spectroscopy, X‐ray diffraction, vibrating sample magnetometry, and scanning electron microscope measurements). The results of characterization analyses revealed that co‐precipitation was unsuccessful for the preparation of magnetic carbon while sonication led to a super‐paramagnetic activated carbon. Adsorption studies revealed that although magnetic carbon presented a decreased adsorption capacity compared with raw carbon, it was an acceptable dye adsorbent. High pH and high ionic strength values favored dye adsorption, while the data of adsorption isotherms and kinetics were better fitted by the Freundlich isotherm model and the pseudo‐second‐order kinetic model, respectively. Regeneration of dye‐loaded activated carbons by thermal re‐activation and re‐use of regenerated samples were also investigated. CONCLUSION Mesoporous magnetic activated carbon, with a saturation magnetization of 18 emu g−1 , was successfully synthesized by sonication of activated carbon and magnetite nanoparticles. The magnetic carbon was found to be an adequate dye adsorbent with a maximum adsorption capacity of 445.294 mg g−1 . © 2017 Society of Chemical Industry
Tập 92 Số 8 - Trang 1899-1911 - 2017
Recent developments of metal oxide semiconductors as photocatalysts in advanced oxidation processes (AOPs) for treatment of dye waste-water
Tập 86 Số 9 - Trang 1130-1158 - 2011
Properties of hydroxyapatite prepared by the hydrolysis of tricalcium phosphate
Tập 31 Số 1 - Trang 15-24 - 1981