中文摘要：

利用聚乙烯醇-海藻酸钠（PVA-SA）固定香菇（Lentinus edodes）菌柄废弃物作为生物吸附剂吸附溶液中的Cd2＋,吸附过滤后的溶液用原子吸收光谱仪（AAS）测定Cd2＋的浓度.结果表明,一元溶液中固定香菇菌柄废弃物吸附Cd2＋适宜的pH值范围为4～7,比自由态香菇粉的（pH5～7）广;二元溶液中随着pH值的增加,Cd2＋的吸附率有线性增加的趋势;当固定Cd2＋浓度为10mgg-1,变化干扰离子Cu2＋或Pb2＋（0～30mgg-1）时,吸附剂对Cd2＋的吸附明显降低;分别用Langmuir、Freundlich、Dubinin-Radushkevich（D-R）和Langmuir-Freundlich等温吸附模型对一元和二元溶液中Cd2＋的等温吸附过程进行拟合,结果表明,Langmuir吸附模型能较好地拟合一元溶液和Cd2＋-Pb2＋二元溶液中Cd2＋的等温吸附过程,相关系数R2分别为0.9981和0.9291.D-R模型能较好地拟合Cd2＋-Cu2＋二元溶液中Cd2＋的等温吸附过程,相关系数R2为0.9623.

英文摘要：

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.