羧基功能化螯合纤维对In(Ⅲ)的吸附行为及机理研究  

Study on In(Ⅲ)adsorption behavior and mechanism of carboxyl functional chelating fibers

作　　者：吴基荣 许珊 冯建[2] 邱奎[2] 刘辉 唐思 李敏 WU Ji-rong;XU Shan;FENG Jian;QUI Kui;LIU Hui;TANG Si;LI Min(Sinopec Xinan Oil and Gas Field Branch,Chengdu 611930,China;School of Chemistry and Chemical Engineering,Chongqing University of Science and Technology,Chongqing 401331,China)

机构地区：[1]中国石化西南油气分公司,成都611930 [2]重庆科技学院化学化工学院,重庆401331

出　　处：《安全与环境学报》2021年第5期2216-2224,共9页Journal of Safety and Environment

基　　金：重庆市自然科学基金项目(cstc2019jcyjmsxmX0789);中国博士后科学基金面上项目(2020M673111);中国博士后科学基金特别项目(2021T140625)。

摘　　要：以聚丙烯腈纤维为基质,通过化学接枝的方式将羧基引入纤维表面,制备得到含有羧基的螯合纤维,并应用于水溶液中In(Ⅲ)吸附分离。采用傅里叶变换红外光谱、扫描电镜、X射线光电子能谱和热重分析技术对样品进行表征。间歇吸附试验表明,所制备螯合纤维对In(Ⅲ)的最大吸附容量为37.5 mg/g,整个吸附过程在120 min以内达到基本平衡,吸附过程复合准二级动力学模型。竞争性吸附试验表明,在含有In(Ⅲ)、Fe(Ⅲ)、Zn(Ⅱ)和Hg(Ⅱ)的混合溶液中,吸附材料对In(Ⅲ)显示出一定的亲和能力。研究依靠路易斯酸碱理论在纤维表面构建了能用于In(Ⅲ)捕捉的吸附位点,为In(Ⅲ)的吸附分离提供了新的思路或方法。A novel carboxyl group chelated fiber was prepared through chemical grafting and it was used as an efficient adsorbent to capture In(Ⅲ)from aqueous solutions in this paper.The related samples in this work were characterized based on Infrared Spectroscopy(FT-IR),Scanning Electron Microscopy(SEM),X-ray Photoelectron Spectroscopy(XPS),and Thermogravimetric Analysis(TGA).The adsorption behavior of the adsorbent towards In(Ⅲ)ions was investigated in detail depending on batch and column experiments.The adsorption equilibrium was achieved within 120 min and the adsorption kinetics of In(Ⅲ)ions followed the pseudo-second-order model.The adsorption equilibrium study exhibited good agreement with the Langmuir isotherm model and the maximum adsorption capacity was as high as 37.5 mg/g.Furthermore,competitive adsorption demonstrated that the adsorption material displayed a certain affinity for In(Ⅲ)ions in the mixed solutions containing In(Ⅲ),Fe(Ⅲ),Zn(Ⅱ),and Hg(Ⅱ)ions.In the fixed-bed experiments,the effects of flow rate and fixed-bed height on breakthrough curves were investigated,and the adsorption capacity of In(Ⅲ)ions on the adsorbent reaches the maximum of 37.2 mg/g when the flow rate was 0.3 mL/min and the fixed-bed height was 50 mm.The mechanism of the adsorption of carboxyl group chelated fiber towards In(Ⅲ)ions was mainly attributed to the chelation of functional groups on the surface in the adsorbent towards In(Ⅲ)ions and N and 0 elements in the functional groups play a very important role in the adsorption process of In(Ⅲ)ions.In other words,the capture process of the carboxyl groups chelated fiber towards In(Ⅲ)ions is a chemical sorption process.Available adsorption sites were constructed on the fiber surface using chemical grafting based on Lewis acid-base theory in this work,which provided a new approach to separation In(Ⅲ)ions from aqueous solutions.

关 键 词：环境工程学 螯合纤维 吸附 铟离子 

分 类 号：X78[环境科学与工程—环境工程]