期刊
JOURNAL OF MOLECULAR LIQUIDS
卷 250, 期 -, 页码 269-277出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.molliq.2017.12.005
关键词
Metal-organic framework (MOF); Leaf-shaped zeolitic imidazolate framework (ZIF-L); Arsenite; Adsorption isotherm; Adsorption kinetic
资金
- Ministry of Higher Education Malaysia (MOHE) [02G07]
- Universiti Teknologi Malaysia (UTM) at Advanced Membranes Technology Research Center (AMTEC) [02G07]
Two-dimensional leaf-shaped zeolitic imidazolate framework (ZIF-L) was synthesized in aqueous solution by using zinc salt and 2-methylimidazole (2-MeIM) at room temperature. The synthesized ZIF-L shows unique two-dimensional (2-D) leaf-like crystal morphology using field emission scanning electron microscope. The crystalline structure and total surface area of ZIF-L was indicated by X-ray diffraction, thermogravimetric analysis and Brunauer-Emmett-Teller analysis. The experimental data of adsorption of arsenite by ZIF-L were well fitted by two-site- pseudo-second-order kinetic model. The adsorption isotherms were well described by Freundlich isotherm model. The synthesized ZIF-L possess maximum uptake of arsenite was 43.74 mg/g at pH 10.0 at the room temperature (25.0 +/- 1 degrees C) which is relatively higher than other class of metal-organic framework. Zeta potential, fourier transform infrared, and scanning electronic microscope combined with X-ray energy dispersive spectrometer concluded that adsorption mechanism of arsenite on ZIF-L was occurred based on electrostatic interaction between arsenite ions and surface charge of ZIF-L, also substitution of hydroxyl group by arsenite to form inner-sphere complex. Since the development of ZIF-L through aqueous media was rapid, simple and eliminated the heating process, ZIF-L can be regarded as a promising adsorbent and low-cost adsorbent for the removal of arsenite. (C) 2017 Elsevier B.V. All rights reserved.
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