根枝藻生物炭对水溶液中U(Ⅵ)的吸附特性研究  

Adsorption Properties of Rhizoclonium Riparium Biochar for U(Ⅵ)in Aqueous Solutions

作　　者：郑均丽 李莹莹 王斌梁 胡保卫 ZHENG Junli;LI Yingying;WANG Binliang;HU Baowei(School of Civil Engineering,Shaoxing University,Shaoxing,Zhejiang 312000;School of Life Sciences,Shaoxing University,Shaoxing,Zhejiang 312000)

机构地区：[1]绍兴文理学院土木工程学院,浙江绍兴312000 [2]绍兴文理学院生命科学学院,浙江绍兴312000

出　　处：《绍兴文理学院学报》2020年第10期50-56,共7页Journal of Shaoxing University

基　　金：国家自然基金面上项目“同步辐射技术研究粘土修饰生物炭固定放射性核素的分子机制”(21876115).

摘　　要：丝状绿藻是一种常见的水华藻类,它具有生长周期短、生物质产量高、收集方便等优点,被认为是一种新型的生物炭原材料.为了探究丝状绿藻生物炭的基本特性及其对放射性元素U(Ⅵ)的吸附能力,本研究以根枝藻为原材料,采用水热碳化法制备生物炭,并系统分析了根枝藻生物炭对U(Ⅵ)的吸附能力.结果表明,根枝藻生物炭比表面积达到23.5 m^2/g.当T=289 K,pH=6.0,CU(Ⅵ)=50 mg/L,m/V=0.5 g/L,离子强度为0.01 M Na Cl时,其最大吸附量可达到46.99 mg/g.通过吸附动力学和热力学模型分析可知,准二级动力学模型和Freundlich等温模型能够较好地描述根枝藻生物炭对U(Ⅵ)的吸附过程,并且表明该过程属于化学吸附.综上所述,根枝藻生物炭是一种新型的、具有较高发展前景的U(Ⅵ)吸附剂.Filamentous green algae are common bloom species boasting the advantages of short growth cycle,high biomass yield,and convenient collection.Thus,they are considered to be a new type of biochar raw material.In order to explore the basic characteristics of filamentous green algal biochar and its adsorption capacity for U(Ⅵ),algal biochar was prepared by using hydrothermal carbonization process from Rhizoclonium riparium.Then,the characterization of the biochar and its adsorption capacity were evaluated.The results show that the specific surface of the biochar reaches 23.5 m^2/g.The maximum amount of adsorption reaches 46.99 mg/g when T is 289 K,p H 6.0,CU(Ⅵ)are 50 mg/L,m/V is 0.5 g/L,and ion strength is 0.01 M NaCl.Through the analysis of adsorption dynamics and thermodynamic models,the paper suggests that the pseudo-second order model and Freundlich isotherm model could well describe the adsorption process.Meanwhile,the calculated parameters show that the process is driven by chemisorption.In all,Rhizoclonium riparium biochar is a novel adsorbent for U(Ⅵ)removal,thereby deserving to be developed.

关 键 词：丝状藻类 生物炭 放射性元素 吸附 

分 类 号：X591[环境科学与工程—环境工程]