固定化微生物吸附剂对Cr~(3+)的吸附特性研究
On the characteristics of the adsorption of Cr~(3+) by immobilized microorganism adsorbents
查看参考文献16篇
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文摘
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从皮革铬鞣、复鞣污泥等处分离、纯化出4株菌株TP、XB、MY和TQ,采用海藻酸钠悬滴法并添加膨润土制成微生物固定化吸附剂,研究该吸附剂对低质量浓度Cr~(3+)的吸附特性。结果表明,4种固定化颗粒对低质量浓度Cr~(3+)有较好的吸附作用。实验室条件下,当吸附温度为30℃时,6 h后固定化吸附剂进入缓慢吸附和平衡吸附阶段。吸附等温曲线拟合研究表明,不同温度下吸附剂适合不同的等温模型。4种微生物吸附剂均与Lagrange拟二级动力学模型拟合最佳,且吸附量从高到低为TQ、TP、XB、MY。颗粒内扩散模型研究表明,20℃下XB和MY对Cr~(3+)的吸附分为快速吸附和缓慢吸附阶段;30℃和40℃下固定化颗粒均呈现表面吸附-缓慢吸附-平衡吸附过程。热力学研究表明,吸附反应均属于自发进行的吸热过程,并且均是化学吸附。 |
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其他语种文摘
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This article is aimed to reduce the low concentrated Cr~(3+) in the environment by using new composite immobilized microorganism adsorbents, that are, the 4 kinds of microorganism adsorbents(TP, XB, MY and TQ) isolated from the chrome-tanned leather building section and the activated sludge from the sewage. In this article, we have adopted the sodium alginate pendant-drop method to produce the immobilized microorganism adsorbents added by bentonite in hoping to improve the adsorption efficiency. The results of our experiment and analysis show that the 4 immobilized microorganism adsorbents turn to be effective to adsorb the low concentrated Cr~(3+) in the liquid phase. In laboratory conditions, the said results indicate that at 30 ℃ the adsorption of Cr~(3+) by immobilized microorganism adsorbents has entered into the slow adsorption and equilibrium adsorption phases during the 6 h period and the mass concentration of Cr~(3+) in the residual solution after TP, XB, MY, TQ adsorbing turned to drop from 5 mg/L to 0.47 mg/L, 1.19 mg/L, 1.54 mg/L and 0.23 mg/L, respectively. In the process, the adsorption rate of all the immobilized microorganism adsorbents may have been over 70%. In our experiments, we have used 2 adsorption isotherm models (Langmuir and Freundlich isotherm models) to fit the experimental data. As a result, different kinds of adsorbents should be made suitable for the different models at the temperatures of 20-40 ℃, thus showing it was easy to proceed with the adsorption process of Cr~(3+) by immobilized adsorbent particles. Besides, the kinetic study results were found in much better agreement with Lagrange pseudo-second-order model than with Lagrange pseudo-first-order model with the order of adsorption quantity being TQ>TP>XB>MY based on the calculation results. What is more, the fitting of intraparticle diffusion model proves that the adsorption process of Cr~(3+) by XB and MY had been going on in 2 steps (fast and slow adsorption phases) in 20 ℃ whereas the adsorption of all the immobilized microorganism adsorbents in 30 ℃ and 40 ℃ is likely to involve 3 steps (the external surface adsorption, the gradual adsorption and the final equilibrium adsorption). Thermodynamically speaking, the adsorption of Cr~(3+) by immobilized microorganism adsorbents is supposed to go on spontaneously, which can be thought of as a kind of chemisorption. |
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来源
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安全与环境学报
,2015,15(2):178-183 【核心库】
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DOI
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10.13637/j.issn.1009-6094.2015.02.038
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关键词
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环境科学技术基础学科
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固定化
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等温吸附模型
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动力学
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热力学
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地址
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1.
中国科学院近代物理研究所, 甘肃省微生物资源开发利用重点实验室, 兰州, 730000
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中国科学院成都生物研究所, 成都, 610041
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中国科学院成都山地灾害与环境研究所, 成都, 610041
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1009-6094 |
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学科
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环境科学基础理论 |
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文献收藏号
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CSCD:5435483
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