Biosorption of Cu（Ⅱ） and Pb（Ⅱ） by Auricularia polytricha

For searching biological material for heavy metal removal of waste-water, using macrofungus Auricularia polytricha as biosorbent for Cu^2＋ and Pb^2＋ removal was investigated. After shaking and biosorbing Cu^2＋ and Pb^2＋ in solution by biosorbents, the filtrates were tested by AAS and the adsorbed quantity of Cu^2＋ and Pb^2＋ was calculated. The biosorbents were effective in removal of Cu^2＋ and Pb^2＋ on the biosorbents that showed a high- est value around pH 5-6. The biosorption rate of Cu^2＋ and Pb^2＋ on A. polytricha biomass decreased with increasing the initial concentration of Cu^2＋ and Pb^2＋ in the medium. The biosorption of Cu^2＋ and Pb^2＋ on the biomasses follows pseudo-second order kinetics. The determined maximum biosorption capacities presented by the fungus biomass were 3.34 and 13.03 mg·g^-1 dry weight for Cu^2＋ and Pb^2＋, respectively by the biosorption equilibrium with Langmuir adsorption isotherm. According to the whole data analysis in each experiment of studying Cu^2＋ and Pb^2＋ biosorption including condition factors and adsorption isotherm, the adsorbed capacity of Pb^2＋ by A. polytricha biomass was bigger than Cu^2＋. The biosorption by A. polytricha was most effective when pH 5-6. The biosorbents are suitable for low Cu^2＋ and Pb^2＋ concentration waste-water, especially for Pb^2＋ removal.

Biosorption of Cu(II) and Pb(II) by <Emphasis Type="Italic">Auricularia polytricha</Emphasis>

For searching biological material for heavy metal removal of waste-water, using macrofungus Auricularia polytricha as biosorbent for Cu²⁺ and Pb²⁺ removal was investigated. After shaking and biosorbing Cu²⁺ and Pb²⁺ in solution by biosorbents, the filtrates were tested by AAS and the adsorbed quantity of Cu²⁺ and Pb²⁺ was calculated. The biosorbents were effective in removal of Cu²⁺ and Pb²⁺ on the biosorbents that showed a highest value around pH 5–6. The biosorption rate of Cu²⁺ and Pb²⁺ on A. polytricha biomass decreased with increasing the initial concentration of Cu²⁺ and Pb²⁺ in the medium. The biosorption of Cu²⁺ and Pb²⁺ on the biomasses follows pseudo-second order kinetics. The determined maximum biosorption capacities presented by the fungus biomass were 3.34 and 13.03 mg · g⁻¹ dry weight for Cu²⁺ and Pb²⁺, respectively by the biosorption equilibrium with Langmuir adsorption isotherm. According to the whole data analysis in each experiment of studying Cu²⁺ and Pb²⁺ biosorption including condition factors and adsorption isotherm, the adsorbed capacity of Pb²⁺ by A. polytricha biomass was bigger than Cu²⁺. The biosorption by A. polytricha was most effective when pH 5–6. The biosorbents are suitable for low Cu²⁺ and Pb²⁺ concentration waste-water, especially for Pb²⁺ removal. Biography: ZHANG Dan(1962–), female, Associate professor, Ph. D., research direction: environment engineering and soil ecology.