固定香菇菌柄废弃物对二元溶液中Cd(II)的竞争性吸附

Immobilized Lentinus edodes residue with polyvinyl alcohol-Na-alginate(PVA-SA) was studied for removing Cd2+ in solution,and the concentration of Cd2+ in solution after the removing was then tested by atomic absorption spectrophotometer(AAS).The results indicated that suitable pH range for Cd2+ biosorption from single-metal solution was 4～7,which was wider than that by free L.edodes powder(pH 5～7).Differing from the single-metal solution,the biosorption rate of Cd2+ in binary-metal solution was linearly increased as pH increased.When the concentration of Cd2+ was fixed at 10 mg g-1 and the concentration of interferential metal Cu2+ or Pb2+ varied from 0 to 30 mg g-1,the biosorption of Cd2+ was decreased significantly.The isotherm models including Langmuir,Freundlich,Dubinin-Radushkevich(D-R) and Langmuir-Freundlich were applied to fit experiment data.It was found that the Langmuir model could best fit isotherm biosorption of Cd2+ in Cd2+ single-metal and in Cd2+/Pb2+ binary-metal solution with correlation coefficient R2 of 0.998 1 and 0.929 1 respectively,while the D-R model would well fit that of Cd2+ in Cd2+/Cu2+ binary solution with correlation coefficient R2 of 0.962 3.