Preparation of potassium niobium sulfide and its selective adsorption properties for Sr2+ and Co2+

被引：0
|
作者：
Chengqiang Liang
Mingchun Jia
Xiaowei Wang
Zhihui Du
Jinfeng Men
Hao Ding
机构：
[1] Naval University of Engineering,College of Nuclear Science and Technology
来源：
Journal of Radioanalytical and Nuclear Chemistry | 2019年 / 322卷
关键词：
Strontium; Cobalt; Adsorption; Potassium niobium sulfide; Kinetics; Isotherm;
D O I：
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中图分类号：
学科分类号：
摘要：
A novel metal sulfide: potassium niobium sulfide (KNbS) was prepared by hydrothermal method. The morphology and composition of KNbS were characterized by scanning electron microscopy and X-ray diffraction. It was confirmed that the adsorption process of KNbS was carried out by exchange reaction of K+ with Co2+ and Sr2+. The effects of pH, contact time, coexisting ions and initial concentration of strontium and cobalt on the adsorption of Sr2+ and Co2+ by KNbS were studied by static adsorption experiments. Thus, the optimal adsorption conditions of KNbS for Co2+ and Sr2+ were determined. The results show that KNbS has a greater affinity for Sr2+ and Co2+ than other coexisting ions. In addition, the adsorption mechanism was analyzed by kinetic, Weber–Morris, Boyd and isothermal models. It was revealed that the adsorption of Co2+ and Sr2+ by KNbS was chemical adsorption of monolayer and the intraparticle diffusion was the main rate-control step.
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页码：377 / 387
页数：10
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