期刊
RSC ADVANCES
卷 4, 期 97, 页码 54454-54462出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4ra08820d
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资金
- Beijing Natural Science Foundation & Scientific Research Key Program of Beijing Municipal Commission of Education [KZ201410016018]
- Training Program Foundation for the Beijing Municipal Excellent Talents [2013D005017000004]
- Importation & Development of High-Caliber Talents Project of Beijing Municipal Institutions [CITCD201404076]
- China Postdoctoral Science of Foundation [2013M540831]
- National Natural Science Foundation of China [51109002]
- Key Laboratory of Urban Stormwater System and Water Environment (Ministry of Education)
Metal-organic frameworks (MOFs), a new class of porous crystalline materials, have attracted great interest as a promising candidate for sustainable energy and environmental remediation. In this study, ZIF-8, a versatile MOF based on imidazolate ligands, was selected as a photocatalyst to decompose methylene blue (MB) under UV light irradiation. The influence factors, kinetics, and mechanism of photocatalytic MB degradation and stability of ZIF-8, were also studied. The results revealed that the ZIF-8 photocatalyst exhibited efficiently photocatalytic activity for MB degradation under UV irradiation, which was confirmed through the detection of hydroxyl radicals ((OH)-O-center dot) by a fluorescence method. The MB degradation over the ZIF-8 photocatalyst followed a pseudo-first-order kinetics model. ZIF-8 worked effectively over a wide pH range from 4.0 to 12.0, and showed both high adsorption capacity and degradation efficiency for MB in a strong alkaline environment. The enhanced efficiency in a strong alkaline environment resulted from the higher charged ZIF-8 (pH > pH(pzc)) and the elevated yield of (OH)-O-center dot facilitated by increased OH- concentration. The possible pathway of photocatalytic degradation of MB in ZIF-8 was proposed. The results indicated that ZIF-8 can be used as a highly efficient photocatalyst to decompose organic pollutants.
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