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J Colloid Interface Sci. 2016 Dec 15;484:162-172. doi: 10.1016/j.jcis.2016.08.074. Epub 2016 Aug 30.

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

Author information

1
Nano-Materials and Environmental Detection Laboratory, Hefei Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei, Anhui 230031, PR China; Department of Chemistry, University of Science and Technology of China, Hefei, Anhui 230026, PR China.
2
Nano-Materials and Environmental Detection Laboratory, Hefei Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei, Anhui 230031, PR China.
3
Anui Polytechnic University, Anhui 233500, PR China.
4
Mengcheng Water Affair Bureau, Mengcheng, Anhui 233500, PR China.
5
Nano-Materials and Environmental Detection Laboratory, Hefei Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei, Anhui 230031, PR China. Electronic address: ltkong@iim.ac.cn.
6
Nano-Materials and Environmental Detection Laboratory, Hefei Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei, Anhui 230031, PR China. Electronic address: xingjiuhuang@iim.ac.cn.
7
Nano-Materials and Environmental Detection Laboratory, Hefei Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei, Anhui 230031, PR China. Electronic address: jhliu@iim.ac.cn.

Abstract

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 740.28m2/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 102.40mg/g at pH 7.0 when the initial fluoride concentration was 200mg/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 (3wt%). 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 20μm thickness could reach 5510, 5173, and 4664L/m2 when fluoride concentrations were 5, 8 and 10mg/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.

KEYWORDS:

Adsorption; Fluoride; Mechanism; Membrane; Zr-MOFs

PMID:
27610471
DOI:
10.1016/j.jcis.2016.08.074
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