The removal of copper ions by tyre char was studied in agitated batch contacting systems. Experiments were carried out to obtain kinetic and equilibrium data. The pseudo-first order and pseudo-second order models were...The removal of copper ions by tyre char was studied in agitated batch contacting systems. Experiments were carried out to obtain kinetic and equilibrium data. The pseudo-first order and pseudo-second order models were used to correlate kinetic data. The best fitting kinetic model was determined by choosing the equation resulting in the lowest sum of error squares （SSE）. The experimental data fitted well to the pseudo-second order model compared to the pseudo-first order model. The Langmuir model was applied to describe the equilibrium data obtained at pH 4.0 ±0. 1 and a fixed temperature of 25 ℃. The maximum capacity of copper adsorption onto the tyre char at an equilibrium copper concentration of 2.45 mmol/L was found to be 0.74 mmol/g. Since the sorption capacity is relatively high, tyre char can be considered as a suitable sorbent for the adsorption of copper in wastewater treatment systems.展开更多
Cytochrome P450 enzyme-copper phosphate hybrid materials with flower-like shape were prepared with a simple but efficient coprecipitation method.The growth process of the hybrid flowers can be divided into three succe...Cytochrome P450 enzyme-copper phosphate hybrid materials with flower-like shape were prepared with a simple but efficient coprecipitation method.The growth process of the hybrid flowers can be divided into three successive steps：coordination/nucleation,growth,and further ripen.The concentration of enzymes in the mother liquor exerted great influence on the morphology and surface enzyme content of the nano-composites.The catalytic performance in the reaction of selective oxidation of sulfide to sulfoxide was also investigated.The hybrid flowers exhibited superior catalytic performance：satisfied thioanisole conversion and selectivity to methyl phenyl sulfoxide （both above 97%） with H2O2 as oxidant under mild reaction conditions,excellent stability and recyclability,and wide scope of substrates.Such results indicate that the hybrid materials are potentially good candidates in the industrial enzyme catalysis.展开更多
文摘The removal of copper ions by tyre char was studied in agitated batch contacting systems. Experiments were carried out to obtain kinetic and equilibrium data. The pseudo-first order and pseudo-second order models were used to correlate kinetic data. The best fitting kinetic model was determined by choosing the equation resulting in the lowest sum of error squares （SSE）. The experimental data fitted well to the pseudo-second order model compared to the pseudo-first order model. The Langmuir model was applied to describe the equilibrium data obtained at pH 4.0 ±0. 1 and a fixed temperature of 25 ℃. The maximum capacity of copper adsorption onto the tyre char at an equilibrium copper concentration of 2.45 mmol/L was found to be 0.74 mmol/g. Since the sorption capacity is relatively high, tyre char can be considered as a suitable sorbent for the adsorption of copper in wastewater treatment systems.
文摘Cytochrome P450 enzyme-copper phosphate hybrid materials with flower-like shape were prepared with a simple but efficient coprecipitation method.The growth process of the hybrid flowers can be divided into three successive steps：coordination/nucleation,growth,and further ripen.The concentration of enzymes in the mother liquor exerted great influence on the morphology and surface enzyme content of the nano-composites.The catalytic performance in the reaction of selective oxidation of sulfide to sulfoxide was also investigated.The hybrid flowers exhibited superior catalytic performance：satisfied thioanisole conversion and selectivity to methyl phenyl sulfoxide （both above 97%） with H2O2 as oxidant under mild reaction conditions,excellent stability and recyclability,and wide scope of substrates.Such results indicate that the hybrid materials are potentially good candidates in the industrial enzyme catalysis.
