Magnetotactic bacteria (MTB) as biosorbents for the adsorption of Au(Ⅲ) and Cu(Ⅱ) ions from aqueous solution have been investigated. The optimum adsorption conditions for both metal ions were the initial pH sc...Magnetotactic bacteria (MTB) as biosorbents for the adsorption of Au(Ⅲ) and Cu(Ⅱ) ions from aqueous solution have been investigated. The optimum adsorption conditions for both metal ions were the initial pH scope of 1-5.5 for Au(Ⅲ) and 2.0-4.5 for Cu(Ⅱ), room temperature, biomass concentration of 10.0g.L^-1 and sorotion du-ration more than 10 min. When the initial metal concentration were within 500mg.L^-1, the maximum biosorption capacity of 1.0g of MTB (dry mass basis) for Au(Ⅲ) and Cu(Ⅱ) were calculated as 505.2mg of Au(Ⅲ) and 493.1mg of.Cu(Ⅱ) by Langmuir model in single system, respectively. The isotherm equilibrium of Au(Ⅲ) and Cu(Ⅱ) ions in the Au-Cu binary system reflected a unique phenomenon that the adsorption of Au(Ⅲ) was rein-forced and that of Cu(Ⅱ) prohibited, compared respectively-with their performances in the single metal system.When the,concentration of-Au(Ⅲ) and Cu(Ⅱ). were below 80mg.L^-1, the waste waterafter MTB treating, wasbelow 1.0mg.L^-1, which is in conformity with Environmental Performance Standards (EPS) of Canada. Besides, all the kinetic data were fitted well to the pseudo second-order kinetic model with a high correlation coefficient (R^2〉0.999).展开更多
A process of biosorption of Cu^2+, Zn^2+ and Cd^2+ on Bacillus subtilis was investigated. The experiments show that the process of biosorption is quite fast, The maximum adsorption was reached after 5 min and hardl...A process of biosorption of Cu^2+, Zn^2+ and Cd^2+ on Bacillus subtilis was investigated. The experiments show that the process of biosorption is quite fast, The maximum adsorption was reached after 5 min and hardly changed with time. The experimental data was analyzed using four sorption kinetic models: the pseudo-first-order, the Ritchie second-order, the modified second-order and the Elovich equations, which helped to determine the best-fit equation for the sorption of metal ions onto biomass, The results show that both the Ritchie second-order and modified secondorder equations can fit the experimental data. The Langmuir model is able to accurately describe adsorption of Cu^2+ and Zn^2+ on B. subtilis. The experimental data points of adsorption Cd^2+ and Zn^2+ on B. subtilis are described by Freundlich isotherms model.展开更多
In this work, the mechanical tensile and elongation properties and the non-woven polypropylene flammability were evaluated, with variations of gratings, compared to non-woven fabrics prepared with thermo film and TNT ...In this work, the mechanical tensile and elongation properties and the non-woven polypropylene flammability were evaluated, with variations of gratings, compared to non-woven fabrics prepared with thermo film and TNT (fabric non-fabric), for applications such as geotextile sorption of oil spills. The results showed high values of tensile strength for non-woven fabric prepared for application as geotextile, improving the mechanical properties of rupture.展开更多
基金Supported by the National Natural Science Foundation of China (No.20206024) and the Natural Science Foundation of Tianjin (No.07JCYBJC06800).
文摘Magnetotactic bacteria (MTB) as biosorbents for the adsorption of Au(Ⅲ) and Cu(Ⅱ) ions from aqueous solution have been investigated. The optimum adsorption conditions for both metal ions were the initial pH scope of 1-5.5 for Au(Ⅲ) and 2.0-4.5 for Cu(Ⅱ), room temperature, biomass concentration of 10.0g.L^-1 and sorotion du-ration more than 10 min. When the initial metal concentration were within 500mg.L^-1, the maximum biosorption capacity of 1.0g of MTB (dry mass basis) for Au(Ⅲ) and Cu(Ⅱ) were calculated as 505.2mg of Au(Ⅲ) and 493.1mg of.Cu(Ⅱ) by Langmuir model in single system, respectively. The isotherm equilibrium of Au(Ⅲ) and Cu(Ⅱ) ions in the Au-Cu binary system reflected a unique phenomenon that the adsorption of Au(Ⅲ) was rein-forced and that of Cu(Ⅱ) prohibited, compared respectively-with their performances in the single metal system.When the,concentration of-Au(Ⅲ) and Cu(Ⅱ). were below 80mg.L^-1, the waste waterafter MTB treating, wasbelow 1.0mg.L^-1, which is in conformity with Environmental Performance Standards (EPS) of Canada. Besides, all the kinetic data were fitted well to the pseudo second-order kinetic model with a high correlation coefficient (R^2〉0.999).
基金Supported by National Natural Science Foundation of China (No. 20206024)
文摘A process of biosorption of Cu^2+, Zn^2+ and Cd^2+ on Bacillus subtilis was investigated. The experiments show that the process of biosorption is quite fast, The maximum adsorption was reached after 5 min and hardly changed with time. The experimental data was analyzed using four sorption kinetic models: the pseudo-first-order, the Ritchie second-order, the modified second-order and the Elovich equations, which helped to determine the best-fit equation for the sorption of metal ions onto biomass, The results show that both the Ritchie second-order and modified secondorder equations can fit the experimental data. The Langmuir model is able to accurately describe adsorption of Cu^2+ and Zn^2+ on B. subtilis. The experimental data points of adsorption Cd^2+ and Zn^2+ on B. subtilis are described by Freundlich isotherms model.
文摘In this work, the mechanical tensile and elongation properties and the non-woven polypropylene flammability were evaluated, with variations of gratings, compared to non-woven fabrics prepared with thermo film and TNT (fabric non-fabric), for applications such as geotextile sorption of oil spills. The results showed high values of tensile strength for non-woven fabric prepared for application as geotextile, improving the mechanical properties of rupture.