生物吸附剂ZL5-2对Cr(Ⅵ)的吸附机理  

Adsorption Mechanism of Chromium Cation by Floc-Type Biosorbent ZL 5-2

作　　者：李强[1] 陈明[1] 崔富昌[1] 程剑锋[1] 张玉臻[1] 

机构地区：[1]山东大学微生物技术国家重点实验室,济南250100

出　　处：《环境科学》2006年第2期343-346,共4页Environmental Science

基　　金：国家自然科学基金项目(30270046)

摘　　要：研究了Agrobacterium sp．产生的生物吸附剂ZL5．2对Or（Ⅵ）的吸附作用，并对吸附Or（Ⅵ）前后及解吸附后的ZL52进行了红外光谱分析．结果表明，ZL5．2对Or（Ⅵ）吸附的最佳pH为0．5～1．5，随着pH增大，吸附作用减弱，ZL5-2吸附Cr（Ⅵ）可在短时间内完成。10min时即有65．4％的Or（Ⅵ）被吸附，60min时吸附率达到90％以上，80min后所有的Or（Ⅵ）都被吸附．该吸附过程符合Langmuir和Freundlich等温吸附方程，被吸附的Or（Ⅵ）可以被解吸附，解吸率为13．6％～67．9％．通过红外光谱分析，推测该吸附过程属于物理吸附，存在可逆吸附和不可逆吸附，以可逆吸附为主．Biosorption of Cr（ Ⅵ ） by the novel biosorbent ZL5-2 produced by Agrobacterium sp. was studied, and infrared spectra of native, absorbing and desorbing ZL 5-2 were compared. The initial pH was important for biosorption. The optimum effect on Cr（ Ⅵ ） biosorption was acquired within initial pH 0.5 - 1.5, then with the pH increasing, the effect on Cr6 ＋ biosorption was reduced. The biosorption for Cr（Ⅵ） was a quick process,only within 10 min 65.4% Cr（ Ⅵ ） is biosorbed, and the biosorption rate was over 90% after 60 min, then all the Cr（ Ⅵ ） was biosorbed after 80 min. The biosorption were fitted with Langmuir and Freundlich isotherm adsorption equations. The absorbed Cr（ Ⅵ ） could be recovered by desorption and the desorption rate reached 13.6% - 67.9%. Progrezs of biosorption was reversible adsorption and irreversible adsorption simultaneously through infrared spectra analysis, however the reversible adsorption was more important in the biosorption and the adsorption belongs to physics adsorption.

关 键 词：生物吸附剂 铬离子 红外光谱分析 吸附机理 

分 类 号：X703.5[环境科学与工程—环境工程]