微生物絮凝剂MBFA9去除水中Pb2+的机理

doi:10.12068/j.issn.1005-3026.2016.11.015

东北大学学报:自然科学版 ›› 2016, Vol. 37 ›› Issue (11): 1588-1592.DOI: 10.12068/j.issn.1005-3026.2016.11.015

微生物絮凝剂MBFA9去除水中Pb²⁺的机理

姜彬慧¹，李凤达¹，刘倩^1,2，胡筱敏¹

(1. 东北大学资源与土木工程学院，辽宁沈阳110819； 2. 辽宁省环境科学研究院，辽宁沈阳110031)

收稿日期:2015-07-13 修回日期:2015-07-13 出版日期:2016-11-15 发布日期:2016-11-18
通讯作者: 姜彬慧
作者简介:姜彬慧(1962-)，女，辽宁沈阳人，东北大学教授；胡筱敏(1958-)，男，江西婺源人，东北大学教授，博士生导师.
基金资助:
国家自然科学基金资助项目( 51278090)；辽宁省科学事业公益研究基金资助项目(201400311).

Removal Mechanism of Lead (II) Ions by Bioflocculant MBFA9 from Aqueous Solution

JIANG Bin-hui¹， LI Feng-da¹， LIU Qian^1,2， HU Xiao-min¹

1.School of Resources & Civil Engineering，Northeastern University，Shenyang 110819，China;2.Liaoning Research Achademy of Environmental Sciences，Shenyang 110031， China.

Received:2015-07-13 Revised:2015-07-13 Online:2016-11-15 Published:2016-11-18
Contact: JIANG Bin-hui
About author:-
Supported by:
-

摘要/Abstract

摘要： 从土壤中筛选得到一株类芽孢杆菌A9，所产微生物絮凝剂MBFA9对水中Pb²⁺具有较高的去除作用，并进一步考察了MBFA9对Pb²⁺的吸附动力学和热力学过程.结果表明:当水中初始Pb²⁺质量浓度为56.20mg/L，MBFA9吸附25min后的去除率最高可达92.73%；MBFA9捕集Pb²⁺的理论最大值为196.08mg/g，吸附速率常数k_○2为0.019g/(mg·min)，动力学特征符合准二级动力学模型，其等温吸附模型与Langmuir方程拟合较好，相关系数R²=0.96；结合红外光谱检测、场发射扫描电镜和能谱分析，探讨了MBFA9去除Pb²⁺的机理为其表面的官能团如羟基、酰胺基、羧基等在捕集Pb²⁺过程中与之发生配合作用，对Pb²⁺的去除贡献了重要作用.

关键词: 微生物絮凝剂MBFA9, Pb²⁺, 动力学, 热力学, 去除机理

Abstract: The bioflocculant produced by a stain of Paenibacillus sp. A9 which separated and purified from soilhada high removal rate of Pb²⁺ in the water， and the adsorption kinetics and thermodynamic process of MBFA9 were further investigated. The results showed that the removal rate of Pb²⁺ reaches 92.73% at initial concentration of 56.2mg/L.The theoretical maximum capacity was 196.08mg/g， and the adsorption rate constant k₂ was 0.019g/(mg·min^-1).The dynamic characteristics of MBFA9 capturing Pb²⁺ in the water are in accordance with pseudo-second kinetic model， and the adsorption isotherm model of MBFA9 capturing Pb²⁺ agrees well with the Langmuir equation of thermodynamics with the correlation coefficient R²=0.96. Comparison among the IR spectra，SEM and EDS of MBFA9 capturing Pb²⁺ showed that the main component of MBFA9 is polysaccharides and the reaction mechanism is that functional groups on the surface of flocculant and Pb²⁺ formed chelate by chelation.There is chemical reaction between hydroxyl， amido， carboxyl and Pb²⁺ in the trapping process， and there is also a floc of sweep function， so MBFA9 has better removal effect on Pb²⁺.

Key words: MBFA9, Pb²⁺, kinetics, thermodynamics, removal mechanism

中图分类号:

TB332

姜彬慧，李凤达，刘倩，胡筱敏. 微生物絮凝剂MBFA9去除水中Pb²⁺的机理[J]. 东北大学学报:自然科学版, 2016, 37(11): 1588-1592.

JIANG Bin-hui， LI Feng-da， LIU Qian， HU Xiao-min. Removal Mechanism of Lead (II) Ions by Bioflocculant MBFA9 from Aqueous Solution[J]. Journal of Northeastern University Natural Science, 2016, 37(11): 1588-1592.

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微生物絮凝剂MBFA9去除水中Pb²⁺的机理

Removal Mechanism of Lead (II) Ions by Bioflocculant MBFA9 from Aqueous Solution

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