聚丙烯腈基钛酸钾球形复合吸附剂的制备及其对Sr~(2+)的吸附性能研究

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英文篇名：Preparation of Polyacrylonitrile-potassium Titanate Spherical Composite Adsorbents and Their Adsorption Properties for Sr~(2+) 作者：杜志辉 ; 贾铭椿 ; 王晓伟 ; 门金凤 英文作者：DU Zhihui;JIA Mingchun;WANG Xiaowei;MEN Jinfeng;College of Nuclear Science and Technology, Naval University of Engineering; 关键词：锶 ; 钛酸钾 ; 聚丙烯腈 ; 吸附 英文关键词：strontium;;potassium titanate;;polyacrylonitrile;;adsorption 中文刊名：原子能科学技术 英文刊名：Atomic Energy Science and Technology 机构：海军工程大学核科学技术学院; 出版日期：2018-12-21 09:52 出版单位：原子能科学技术 年：2019 期：08 基金：国家自然科学基金资助项目(51573208);; 海军工程大学自主立项资助项目 语种：中文; 页：20-27 页数：8 CN：11-2044/TL ISSN：1000-6931 分类号：O647.33;X771

摘要

以钛酸钾(KTiO)为有效成分、聚丙烯腈(PAN)为基体,制备了聚丙烯腈基钛酸钾球形复合吸附剂(PAN-KTiO)。采用扫描电镜(SEM)、X射线衍射仪(XRD)等对PAN-KTiO进行了表征,并通过静态吸附实验,研究了接触时间、pH值、竞争离子、Sr~(2+)初始浓度等对PAN-KTiO吸附Sr~(2+)效果的影响,分析了吸附过程的反应动力学和吸附等温线。结果表明,PAN-KTiO对Sr~(2+)的吸附平衡时间约为24 h,PAN-KTiO吸附Sr~(2+)时,溶液最佳pH值约为6.55;Ca~(2+)、Mg~(2+)对Sr~(2+)在PAN-KTiO上的吸附存在较强的抑制作用;准二级动力学方程能更好地描述PAN-KTiO对Sr~(2+)的吸附动力学过程,而Langmuir模型能更好地描述PAN-KTiO对Sr~(2+)的吸附等温线;PAN-KTiO对Sr~(2+)的吸附过程是以化学吸附为主的单分子层吸附,PAN-KTiO对Sr~(2+)的饱和吸附容量可达53.850 mg/g。
        Polyacrylonitrile-potassium titanate spherical composite adsorbents(PAN-KTiO) were prepared by supporting KTiO powder on PAN to remove Sr~(2+) from aqueous solution. PAN-KTiO was characterized by SEM, XRD, etc. Sr~(2+) adsorption on PAN-KTiO as a function of contact time, pH, competition ions and initial Sr~(2+) concentration was studied via batch experiments. Furthermore, the adsorptive kinetics and isotherms were analyzed. The results show that the Sr~(2+)adsorption on PAN-KTiO can reach equilibrium after about 24 h. The optimized pH value of solution for Sr~(2+) adsorption on PAN-KTiO is about 6.55. Among the competitive ions, Ca~(2+) and Mg~(2+) significantly hinder Sr~(2+) adsorption on PAN-KTiO. Sr~(2+) adsorption on PAN-KTiO follows a pseudo-second-order kinetic model and is in best agreement with the Langmuir isotherm model, indicating a saturated adsorption capacity of 53.850 mg/g, which also indicates that the Sr~(2+)adsorption on PAN-KTiO is monolayer adsorption and a chemical adsorption process.

引文

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