The Experts below are selected from a list of 4143 Experts worldwide ranked by ideXlab platform
Feng Hong - One of the best experts on this subject based on the ideXlab platform.
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enhanced decolourization efficiency of textile dye reactive blue 19 in a horizontal Rotating Reactor using strips of bnc immobilized laccase optimization of conditions and comparison of decolourization efficiency
Biochemical Engineering Journal, 2020Co-Authors: Haibin Yuan, Lin Chen, Zhangjun Cao, Feng HongAbstract:Abstract The textile dyeing and printing industry has led to extensive environmental pollution and severely threatens ecosystems. Immobilized laccase (IL) is an effective biocatalyst for the biotreatment of dye effluents, but is usually restricted by its aerobic requirements. Thus, it is desirable to design an efficient Reactor that will increase the applicability of IL on an industrial scale. Decolourization efficiency of Reactive Blue 19 (RB 19), selected as a model textile dye, was compared between a horizontal Rotating Reactor (HRR) and a traditional vertical mixing Reactor (VMR). The HRR was equipped with strips of bacterial nanocellulose (BNC) immobilized laccase, and the VMR contained wafers of BNC immobilized laccase. The maximum decolourization efficiency of HRR was achieved at the optimized temperature of 55°C, pH of 4.0, and agitation speed of 20 rpm. Advantages of HRR over VMR include a broader range of enzymatic reacting temperatures, greater contact and reacting interfacial area, and higher oxygen availability. After reacting RB 19 at optimized conditions for 5 h, the decolourization ratios of the VMR and HRR were, respectively, 45.7 % and 88.2 %. The HRR provided greater reusability of immobilized enzyme and higher detoxification, removal of chemical oxygen demand and total organic carbon, indicating great potential in promoted decolourization of dyeing effluents.
Chunfei Wu - One of the best experts on this subject based on the ideXlab platform.
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carbon nanotubes synthetized from gaseous products of waste polymer pyrolysis and their application
Journal of Analytical and Applied Pyrolysis, 2016Co-Authors: N Borsodi, A Szentes, Norbert Miskolczi, Chunfei WuAbstract:This work is dedicated to the synthesis of carbon nanotube from pyrolysis gases obtained by plastics. Virgin and waste plastics (polyethylene, polypropylene, polystyrene, polyamide, polyvinyl-chloride, municipal plastic waste) were used as raw materials and fed into a horizontal tubular Reactor and pyrolyzed without catalyst at 560–570 °C. Raw materials could be transformed into 14–32% gases and 15–44% pyrolysis oils, depending on the type of raw materials. Pyrolysis of municipal plastic waste produced the highest gas yield, while pyrolysis of virgin polypropylene gave the highest oil yield. Gases were passed through a chemical vapour deposition Reactor, where they were transformed into carbon nanotubes at 700 °C in a semi-continuous Rotating Reactor with 0.5 h reaction time. To enhance the transformation of pyrolysis gases into carbon nanotubes (CNTs), Fe and Co based catalysts were used. Both gaseous and oil products of pyrolysis were investigated by gas-chromatography. The produced CNTs were added as reinforcement into a commercial low density polyethylene matrix using heated two roll mill and then specimens for testing were manufactured. Especially the reinforcing effects of carbon nanotube were investigated through the measuring of tensile and Charpy impact properties of the CNTs-LDPE polymers.
Masayuki Taniguchi - One of the best experts on this subject based on the ideXlab platform.
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treatment of model soils contaminated with phenolic endocrine disrupting chemicals with laccase from trametes sp in a Rotating Reactor
Journal of Bioscience and Bioengineering, 2001Co-Authors: Takaaki Tanaka, Takashi Tonosaki, Masataka Nose, Noriko Tomidokoro, Noriko Kadomura, Tomoyuki Fujii, Masayuki TaniguchiAbstract:An enzymatic treatment system for the remediation of sand contaminated with endocrine-disrupting chemicals (EDCs) was studied. Laccase from Trametes sp. (Laccase Daiwa) decreased the amounts of nonylphenol, octylphenol, bisphenol A and ethynylestradiol (synthetic estrogen) adsorbed on sea sand (2 μmol g−1) in a test tube with shaking. The phenolic endocrine-disrupting chemicals might have polymerized via enzymatic conversion to their phenoxy radicals. The optimum pH for the enzymatic treatment was approximately 5. A Rotating Reactor was used for scaling up the enzymatic treatment. The reaction rate increased by Rotating the Reactor. The optimum speed of revolution was 10–15 rpm for the treatment of nonylphenol. The amounts of octylphenol, bisphenol A, and ethynylestradiol also decreased enzymatically in the Reactor. Our enzymatic treatment system with a Rotating Reactor will be useful for the treatment of soil highly polluted with phenolic EDCs.
Haibin Yuan - One of the best experts on this subject based on the ideXlab platform.
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enhanced decolourization efficiency of textile dye reactive blue 19 in a horizontal Rotating Reactor using strips of bnc immobilized laccase optimization of conditions and comparison of decolourization efficiency
Biochemical Engineering Journal, 2020Co-Authors: Haibin Yuan, Lin Chen, Zhangjun Cao, Feng HongAbstract:Abstract The textile dyeing and printing industry has led to extensive environmental pollution and severely threatens ecosystems. Immobilized laccase (IL) is an effective biocatalyst for the biotreatment of dye effluents, but is usually restricted by its aerobic requirements. Thus, it is desirable to design an efficient Reactor that will increase the applicability of IL on an industrial scale. Decolourization efficiency of Reactive Blue 19 (RB 19), selected as a model textile dye, was compared between a horizontal Rotating Reactor (HRR) and a traditional vertical mixing Reactor (VMR). The HRR was equipped with strips of bacterial nanocellulose (BNC) immobilized laccase, and the VMR contained wafers of BNC immobilized laccase. The maximum decolourization efficiency of HRR was achieved at the optimized temperature of 55°C, pH of 4.0, and agitation speed of 20 rpm. Advantages of HRR over VMR include a broader range of enzymatic reacting temperatures, greater contact and reacting interfacial area, and higher oxygen availability. After reacting RB 19 at optimized conditions for 5 h, the decolourization ratios of the VMR and HRR were, respectively, 45.7 % and 88.2 %. The HRR provided greater reusability of immobilized enzyme and higher detoxification, removal of chemical oxygen demand and total organic carbon, indicating great potential in promoted decolourization of dyeing effluents.
Emma Anna Carolina Emanuelsson - One of the best experts on this subject based on the ideXlab platform.
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kinetic resolution of 1 phenylethanol in the spinning mesh disc Reactor investigating the Reactor performance using immobilised lipase catalyst
Chemical Engineering and Processing, 2018Co-Authors: Parimala Shivaprasad, Matthew D Jones, Darrell A Patterson, Emma Anna Carolina EmanuelssonAbstract:Abstract The spinning mesh disc Reactor (SMDR) is an innovative catalytic Rotating Reactor to aid process intensification. In this study, the application of the SMDR has been demonstrated for the enzymatic kinetic resolution of racemic 1-phenyethanol using amano lipase immobilised on wool as a catalyst. Physical characterisation of wool was carried out to confirm the presence of lipase. The reaction was tested for a range of solvents and temperatures for both free and immobilized lipase and the optimised reaction conditions were employed in the SMDR for different flowrates and spinning speeds. The SMDR showed better reaction efficiency compared to the batch Reactor: the feed throughput was scaled-up from 10 ml to 250 ml and the productivity increased from 7.05 g l−1 h−1 in batch to 10.92 g l−1 h−1 in the SMDR. An increase in catalyst loading was achieved by adding more lipase cloths and the reaction rate increased from 0.16 mmol min−1 (one cloth) to 0.28 mmol min−1 (three cloths). These results show the first demonstration of novel Reactor design for scale-up of enzymatic kinetic resolution using an inexpensive lipase. The SMDR thus shows potential for scale-up and continuous processing for versatile applications in the fine chemicals and pharmaceutical industry.
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increasing reaction rate and conversion in the spinning cloth disc Reactor investigating the effect of using multiple enzyme immobilized cloths
Chemical Engineering Journal, 2014Co-Authors: Darrell A Patterson, Xudong Feng, Murat O Balaban, Emma Anna Carolina EmanuelssonAbstract:Abstract The spinning cloth disc Reactor (SCDR) is a novel mesh supported enzyme Rotating Reactor system for process intensification. In this study, to increase the enzyme loading in the SCDR, a new Reactor operational mode was designed by increasing the number of cloths used in the SCDR to form a multi-cloth stack on the spinning disc. To test its effectiveness, the influence of the number of cloths in the SCDR on reaction conversion and rate was investigated. The flow within the multi-cloth stack was characterized by residence time distribution (RTD) analysis and an imaging of the flow and dye penetration in the SCDR. For different tributyrin substrate concentrations (10–40 g L−1), the reaction rate and conversion increased when the number of cloths was increased from one to two, indicating that the enzyme loading in the SCDR can be easily tailored to the desired reaction system by simply changing the number of immobilized enzyme cloths. The mean residence time increased with an increase in the number of cloths at different spinning speeds and flow rates, due to flow existing inside the volume of the multi-cloth stack. The number of tanks-in-series (N) decreased as the increase of cloth number on the spinning disc, indicating that more cloths caused larger deviation from plug flow. The visual study showed that the multi-cloth stack would not essentially change the flow types in the SCDR, and the fluid could penetrate through the three layers of multi-cloth at both low (100 rpm) and high (400 rpm) spinning speeds.
