2种微生物去除水中Cr(Ⅵ)性能及机理比较  

Comparison of the Removal Performance and Mechanism of Cr(Ⅵ)by Two Microorganisms

作　　者：张正 周芳 邹文滔 阮启超 陈章 ZHANG Zheng;ZHOU Fang;ZOU Wentao;RUAN Qichao;CHEN Zhang(School of Resource Environment and Safety Engineering,Hunan University of Science and Technology,Xiangtan 411201,China;Hunan Province Key Laboratory of Coal Resources Clean Utilization and Mine Environment Protection,Hunan University of Science and Technology,Xiangtan 411201,China)

机构地区：[1]湖南科技大学资源环境与安全工程学院,湖南湘潭411201 [2]湖南科技大学煤炭资源清洁利用与矿山环境保护湖南省重点实验室,湖南湘潭411201

出　　处：《环境科学与技术》2025年第3期177-184,共8页Environmental Science & Technology

基　　金：湖南省自然科学基金项目(2024JJ5154);湖南省教育厅科研基金项目(23A0378)。

摘　　要：Cr(Ⅵ)是水体重金属污染重要来源,微生物吸附剂在Cr(Ⅵ)污染水体处理中应用广泛。该文以掷孢酵母MWT-01(Spo⁃robolomyces carnicolor MWT-01)和蜡样芽孢杆菌ZNT-03(Bacillus cereus ZNT-03)为吸附材料,比较研究了MWT-01和ZNT-03去除Cr(Ⅵ)的性能及机理。结果表明,pH值对MWT-01和ZNT-03吸附Cr(Ⅵ)影响显著;2种菌均符合准二级吸附动力学模型和Langmuir吸附等温线模型,MWT-01最大吸附量为58.58 mg/g,ZNT-03最大吸附量为77.75 mg/g;共存离子(K^(+)、Na^(+)、Mg^(2+)、Ca^(2+)、Cl^(-)和SO_(4)^(2-))对Cr(Ⅵ)吸附影响较小。研究证实,MWT-01和ZNT-03主要通过微生物表面官能团,以静电吸引、络合反应、氧化还原实现对Cr(Ⅵ)的有效去除。Sporobolomyces carnicolor MWT-01和Bacillus cereus ZNT-03的细胞壁组成差异导致它们对Cr(Ⅵ)的吸附能力不同。ZNT-03的细胞壁结构更简单,使其更容易暴露表面官能团,更有利于Cr(Ⅵ)还原并形成稳定的络合物,提高吸附效率。MWT-01细胞壁结构复杂,阻碍了表面官能团与Cr(Ⅵ)的相互作用,影响了Cr(Ⅵ)去除能力。该研究为Cr(Ⅵ)微生物吸附剂的选择和优化提供了研究支持。Cr(Ⅵ)is one of the major heavy metal pollutants in aquatic environment,and microbial adsorbents are widely utilized for the treatment of Cr(Ⅵ).In this study,Sporobolomyces carnicolor MWT-01 and Bacillus cereus ZNT-03 were employed as adsorbent materials to investigate the removal performance and mechanism of Cr(Ⅵ).The results showed that the pH exerts a significant influence on the adsorption of Cr(Ⅵ);the pseudo-first-order model and the Langmuir isotherm model offer a better fitting,with a maximum adsorption capacity of 58.58 mg/g for MWT-01 and 77.75 mg/g for ZNT-03.K^(+),Na^(+),Mg^(2+),Ca^(2+),Cl^(-),and SO_(4)^(2-)have a negligible effect on the adsorption of Cr(Ⅵ).The results confirmed that MWT-01 and ZNT-03 adsorb Cr(Ⅵ)through the surface functional groups,regulating by electrostatic attraction,complexation,and reduction.The differences in the composition and structure of cell wall between Sporobolomyces carnicolor MWT-01 and Bacillus cereus ZNT-03 lead to distinct adsorption capacities for Cr(Ⅵ).The simpler cell wall structure of ZNT-03 make it easier to expose surface functional groups,which is more conducive to the reduction of Cr(Ⅵ)and the formation of stable complexes,thereby enhancing the adsorption efficiency.The complex structure of cell wall in MWT-01 impedes the interaction between surface functional groups and Cr(Ⅵ),affecting the adsorption capacity of Cr(Ⅵ).This study provides support for selecting and optimizing microbial adsorbent to remove Cr(Ⅵ).

关 键 词：Cr(Ⅵ) 微生物吸附剂 吸附 机理 

分 类 号：X703[环境科学与工程—环境工程]