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科技导报  2014 

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, PP. 21-25

Keywords: 柴胡药渣,锌离子,生物吸附,动力学

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Abstract:

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(ρm)、粒度(Mz)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,ρm为4.0~8.0g/L,Mz为40~100目,C0为0.1~2.0mmol/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(qmax)达到19.96mg/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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