固定香菇菌柄废弃物对二元溶液中Cd(Ⅱ)的竞争性吸附  

Effect of Competitive Interference on Biosorption of Cd(Ⅱ) by Immobilized Lentinus edodes Residue

作　　者：马培[1,2] 张丹[1] 李伟[1] 何海江[1,2] 余东[1] 

机构地区：[1]中国科学院水利部成都山地灾害与环境研究所,山地环境演变与调控重点实验室,成都610041 [2]中国科学院研究生院,北京100049

出　　处：《应用与环境生物学报》2010年第1期114-117,共4页Chinese Journal of Applied and Environmental Biology

基　　金：国家自然科学基金项目(No.40871111);四川省科技攻关项目(No.04SG023-006-05)资助~~

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.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.

关 键 词：香菇菌柄废弃物固定 干扰吸附 Cd2+ 聚乙烯醇-海藻酸钠 等温吸附 

分 类 号：X703[环境科学与工程—环境工程]