基于数学模型对胞外聚合物吸附Cu^(2+)、Cd^(2+)的研究  

Research on the Adsorption of Cu^(2+)and Cd^(2+) by Extracellular Polymers Based on Mathematical Models

作　　者：费维繁 杨英 王娣 陈玉 李卫华 FEI Weifan;YANG Ying;WANG Di;CHEN Yu;LI Weihua(School of Environmental and Energy Engineering,Anhui Jianzhu University,Hefei 230000,China;Anhui Provincial Key Laboratory of Water Pollution Control,Hefei 230000,China)

机构地区：[1]安徽建筑大学环境与能源工程学院,安徽合肥230000 [2]安徽省水污染控制重点实验室,安徽合肥230000

出　　处：《环境科学与技术》2024年第2期1-8,共8页Environmental Science & Technology

基　　金：国家自然科学基金(51978003);安徽省研究生教育教学改革研究项目(2022jyjxggyj314);省住房城乡建设科学技术计划项目(2023-RK025)。

摘　　要：文章利用三维模型构建出吸附曲面对活性污泥中胞外聚合物(EPS)对Cu^(2+)、Cd^(2+)吸附行为进行研究预测,并讨论离子竞争吸附机理。在单一金属体系中EPS对Cu^(2+)(534.72 mg/g)的吸附量要高于Cd^(2+)(504.71 mg/g)。通过三维模型模拟出三维吸附曲面可以看出Cu^(2+)的存在明显抑制了EPS对Cd^(2+)的吸附,但Cd^(2+)对Cu^(2+)的吸附干扰很小,EPS与Cu^(2+)的亲和力要高于Cd^(2+),其吸附过程更适用于Langmuir等温线,吸附质与吸附位点一一对应。结合红外光谱、三维荧光光谱和SEM-EDX分析表明,EPS在吸附前后材料形貌发生了明显变化,该现象出现的原因可能是金属离子的吸附是通过羧基、羟基、酰胺等活性官能团与金属离子成键及络合作用;同时离子交换也是EPS吸附金属离子的一个重要机制。该研究为进一步发掘利用胞外聚合物及后续应用提供理论依据和技术支持。An adsorption surface was constructed using a three-dimensional model to predict the adsorption behavior of copper and cadmium ions by extracellular polymers(EPS)in activated sludge and the mechanism of ion-competitive adsorp⁃tion was discussed.The adsorption of Cu ions(534.72 mg/g)by EPS in the single metal system was higher than that of Cd ions(504.71 mg/g),and the adsorption process was more applicable to the Langmuir isotherm,where the adsorbate and adsorption sites corresponded one to one.The combination of infrared spectroscopy,three-dimensional fluorescence spectros⁃copy and SEM-EDX analysis showed that the morphology of EPS changed significantly before and after the adsorption,and the reason for this phenomenon may be that the adsorption of metal ions is through the carboxyl,hydroxyl,amide,and other reactive functional groups and metal ions bonding and complexation.At the same time,the ion exchange is also an important mechanism for the adsorption of metal ions on EPS.The study provides theoretical basis and technical support for further exploration and utilization of extracellular polymers and subsequent applications.

关 键 词：生物吸附剂 竞争吸附 三维吸附曲面 SEM-EDX分析 三维荧光分析 

分 类 号：X703[环境科学与工程—环境工程]