Performance of a novelly-defined zirconium metal-organic frameworks adsorption membrane in fluoride removal

JOURNAL OF COLLOID AND INTERFACE SCIENCE

卷:484

Article

He, Junyong^1,2  Cai, Xingguo^1,2  Chen, Kai^1,2  Li, Yulian^1,2  Zhang, Kaisheng¹  Jin, Zhen¹  Meng, Fanli¹  Liu, Ning³  Wang, Xuguang⁴  Kong, Lingtao¹  Huang, Xingjiu¹  Liu, Jinhuai¹ 

[1] Chinese Acad Sci, Hefei Inst Intelligent Machines, Nanomat & Environm Detect Lab, Hefei 230031, Anhui, Peoples R China

[2] Univ Sci & Technol China, Dept Chem, Hefei 230026, Anhui, Peoples R China

[3] Anui Polytech Univ, Wuhu 233500, Anhui, Peoples R China

[4] Mengcheng Water Affair Bur, Mengcheng 233500, Anhui, Peoples R China

关键词: Zr-MOFs;    Membrane;    Fluoride;    Adsorption;    Mechanism;   

DOI  :  10.1016/j.jcis.2016.08.074

来源: Elsevier

【 摘 要 】

A novelly-defined adsorption membrane for rapid removal of fluoride from drinking water was prepared. Both zirconium metal-organic frameworks (Zr-MOFs) adsorbent and membrane with large specific surface area of 740.28 m(2)/g were used for fluoride removal for the first time. For adsorption technique, fluoride adsorption on Zr-MOFs was studied on a batch mode. The adsorption data could be well described by Langmuir isotherm model while the adsorption kinetic followed pseudo-second-order model. The maximum of adsorption capacity was 102.40 mg/g at pH 7.0 when the initial fluoride concentration was 200 mg/L. The FT-IR and XPS analyses of Zr-MOFs revealed that both surface hydroxyl groups and Zr(IV) active sites played important roles in fluoride adsorption process. The as-prepared Zr-MOFs adsorbent was suitable for practical treatment of drinking water and regeneration by sodium hydroxide solution (3 wt%). For membrane experiments, Zr-MOFs membrane supported on Alumina substrate could remove fluoride efficiently through dynamic filtration. The fluoride removal capability of Zr-MOFs membrane depended on flow rate and initial concentration of fluoride. The fluoride removal abilities of Zr-MOFs membrane with 20 mu m thickness could reach 5510, 5173, and 4664 L/m(2) when fluoride concentrations were 5, 8 and 10 mg/L, respectively. This study indicated that Zr-MOFs membrane could be developed into a very viable technology for highly effective removal of fluoride from drinking water. (C) 2016 Elsevier Inc. All rights reserved.

【 授权许可】

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