文献类型： 外文期刊
作者： Li, Yujiao 1 ; Yang, Zhimin 1 ; Chen, Yucheng 1 ; Huang, Lei 1 ;
作者机构： 1.Southwest Univ, Coll Resource & Environm, Key Lab Gorges Reservoir Reg Ecoenvironm 3, Minist Educ, 2 Tiansheng Rd Beibei, Chongqing 400715, Peoples R China
2.Chongqing Engn Res Ctr Rural Cleaning, Chongqing 400716, Peoples R China
3.Chongqing Key Lab Agr Resources & Environm, Chongqing 400716, Peoples R China
关键词： Magnetic; Hydroxyapatite; Water treatment; Cadmium; Adsorption
期刊名称：ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH （ 影响因子：4.223； 五年影响因子：4.306 ）
ISSN： 0944-1344
年卷期： 2019 年 26 卷 17 期
页码：
收录情况： SCI
摘要： Adsorption plays an important role in removing cadmium (Cd2+) from water, and magnetic adsorbents are increasingly being used due to their ease of separation and recovery. Magnetic Fe3O4-coated hydroxyapatite (HAP) nanoparticles (nHAP-Fe3O4) were developed by co-precipitation and then used for the removal of Cd2+ from water. The properties of these nanoparticles were characterized by transmission electron microscopy, X-ray diffraction, Fourier transform infrared spectroscopy, and magnetization curves. Experiments were conducted to investigate the effects of adsorption and mechanisms. Results illustrated that kinetic data were well fitted by a pseudo-second-order model. The adsorption capacity of nHAP-Fe3O4 was 62.14mg/g. The mechanisms for the adsorption of Cd2+ on nHAP-Fe3O4 included rapid surface adsorption, intraparticle diffusion, and internal particle bonding, with the ion exchange with Ca2+ and chemical complexation being the most dominant. The regeneration efficiency and recovery rate of nHAP-Fe3O4 eluted by EDTA-Na-2 after the fifth cycle were 63.04% and 40.2%, respectively. Results revealed that the feasibility of nHAP-Fe3O4 as an adsorbent of Cd2+ and its environmental friendliness make it an ideal focus for future research.
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