絮凝型生物吸附剂ZL5-2对Cr^(6+)的吸附作用研究  

Cr^(6+) BIOSORPTION BY FLOC-TYPE BIOSORBENT ZL5-2

作　　者：李强[1] 张玉臻[1] 陈明[1] 

机构地区：[1]山东大学微生物技术国家重点实验室,山东济南250100

出　　处：《水处理技术》2005年第3期25-27,共3页Technology of Water Treatment

基　　金：国家自然科学基金资助项目(30270046)

摘　　要：本文研究了细菌Agrobacterium.sp产生的絮凝型生物吸附剂ZL5-2对Cr6+的吸附作用。结果表明,ZL 5-2对Cr6+吸附的最佳pH 为0.5-1.5,随着pH增大,吸附作用减弱,pH>3.0后,吸附处于一个低水平的平衡。其他金属离子如Na+、Ca2+、Mg2+、Zn2+、Al3+、K+对吸附作用的影响不大。该吸附过程符合Langmuir和Freundlich等温吸附方程。60 min时吸附达到平衡,Cr6+吸附量可达到37.3 mg/g。被吸附的Cr6+可以被解吸附,解吸率为23.6%～37.9%。The biosorption of Cr6+ by the novel floc-type biosorbent ZL5-2 produced by Agrobacterium. sp. was studied. The optimal pH for the adsorption of Cr6+ to the biosorbent was 0.5～1.5. As pH increased, the adsorption action weakened; after pH>3.0, the adsorption was in the equilibrium at low level. Other metal ions, such as Na+, Ca2+, Mg2+, Zn2+,Al3+and K+. had no obvious influence on the adsorption action. This adsorption process is in conformity with the isothermal adsorption equation of Langmuir and Freundlich. 60min later, the adsorption reached equilibrium and Cr6+ adsorption quantity can reach to 37.3mg/g; the adsorbed Cr6+ can be desorbed; the desorption rate was 13.6%～67.9%.

关 键 词：CR^6+ 生物吸附剂 吸附作用 絮凝 等温吸附方程 AL^3+ 解吸率 Ca^2+ MG^2+ 减弱 

分 类 号：P618.11[天文地球—矿床学] X703[天文地球—地质学]