柴胡药渣对锌离子的吸附动力学特性

doi:10.3981/j.issn.1000-7857.2014.21.002

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摘要为了探讨柴胡药渣对含锌废水的吸附特性和液相pH 值、电导率变化特性，以柴胡药渣为生物吸附剂，进行了Zn²⁺批量吸附实验研究。分析了液相pH 值、Zn²⁺初始浓度（C₀）、柴胡药渣加入质量浓度（ρ_m）、粒度（M_z）等因素对吸附效果的影响，并进行等温吸附模拟及吸附动力学相关分析。结果表明，实验室环境下的较佳的吸附条件为：pH 值为4.0～6.0，ρ_m 为4.0~8.0 g/L，M_z为40~100 目，C₀为0.1~2.0 mmol/L。柴胡药渣对Zn²⁺的等温吸附结果很好符合了Langmuir 和Freunlich 吸附模型，R²分别为0.978 和0.989；计算所得最大吸附量（q_max）达到19.96 mg/g，说明柴胡药渣对Zn²⁺有很好的吸附能力。动力学吸附分析表明，柴胡药渣对Zn²⁺的吸附是一个快速进行的反应过程，二级吸附速率方程拟合结果中R²均在0.997 以上，由此认为其吸附反应过程中限速步骤是化学吸附过程。柴胡药渣对Zn²⁺吸附过程中液相pH 值分析表明，pH 值呈现初始阶段迅速升高后进入缓慢变化的趋势。

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	代群威
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关键词 ：柴胡药渣, 锌离子, 生物吸附, 动力学

Abstract：In order to explore the adsorption characteristics, liquid pH, and electrical conductivity variation characteristics of bupleurum dreg to the waste water containing zinc, the bupleurum dreg was utilized as biosorbent to remove Zn²⁺ with batch experiments. The effect factors on biosorption were analyzed, which included pH values, initial Zn²⁺ concentration (C₀), biosorbent concentration (ρ_m), and mesh size (M_z). Meanwhile, the isotherm biosorption and kinetics was analyzed. The results showed that the optimum condition for biosorption was as follows: pH was 4.5~6.0, ρ_m was 4.0~8.0 g/L, C₀ was 0.1~2.0mmol/L, M_z was 40~100 mesh. The isotherm adsorption curve of Zn²⁺ on bupleurum dreg accorded well with Langmuir and Freunlich model, and the R² value was 0.978 and 0.989 while the value of q_max was 19.96 mg/g. This shows that a bupleurum dreg has excellent adsorption capacity to zinc ions. The kinetics analysis showed that the biosorption of Zn²⁺ on bupleurum dreg was a rapid process, and the R² values were all above 0.997. These indicated that its limit step was chemical adsorption process. The variation trend of pH values in liquid was increasing rapidly at initial adsorption phase and then changed slowly in the succedent phases.

Key words： bupleurum dreg zinc ions biosorption kinetics

收稿日期: 2014-04-28

ZTFLH:

X703

基金资助:国家自然科学基金项目（41102212）；西南科技大学自然科学基金项目（12zx7121）

作者简介: 代群威，副教授，研究方向为环境友好材料，电子信箱：qw_dai@163.com

引用本文:

代群威, 王岩, 赵玉连, 周世平, 杨兴旺, 张伟. 柴胡药渣对锌离子的吸附动力学特性[J]. 科技导报, 2014, 32(21): 21-25.
DAI Qunwei, WANG Yan, ZHAO Yulian, ZHOU Shiping, YANG Xingwang, ZHANG Wei. Biosorption Kinetics Characteristics of Bupleurum Dreg to Zinc Ions. journal1, 2014, 32(21): 21-25.

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http://www.kjdb.org/CN/10.3981/j.issn.1000-7857.2014.21.002 或 http://www.kjdb.org/CN/Y2014/V32/I21/21

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