Synthesis of nano SnO2-coupled mesoporous molecular sieve titanium phosphate as a recyclable photocatalyst for efficient decomposition of 2,4-dichlorophenol
Synthesis of nano SnO2-coupled mesoporous molecular sieve titanium phosphate as a recyclable photocatalyst for efficient decomposition of 2,4-dichlorophenol作者机构：Key Laboratory of Functional Inorganic Materials Chemistry Heilongjiang University Ministry of Education School of Chemistry and Materials Science International 2oint Research Center for Catalytic Technology Heilongjiang University Harbin 150080 China
出 版 物：《Nano Research》 (纳米研究（英文版）)
年 卷 期：2018年第11卷第3期
页 面：1612-1624页
核心收录：
学科分类：080903[工学-微电子学与固体电子学] 081705[工学-工业催化] 0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学] 0817[工学-化学工程与技术] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学]
基 金：We are grateful to financial support from the National Natural Science of China (Nos. U1401245 21501052 and 91622119) the Program for Innovative Research Team in Chinese Universities (No. IRT1237) the Research Project of Chinese Ministry of Education (No. 213011A) Special Funding for Postdoctoral of Heilongjiang Province (No. LBH-TZ06019) and the Science Foundation for Excellent Youth of Harbin City of China (Nos. 2014RFYXJ002 2016RQQXJ099 and UNPYSCT-2016173)
主 题：mesoporous molecular sieve titanium phosphate coupling SnO2 charge separation photocatalysis 2 4-dichlorophenol decomposition
摘 要：It is essential to develop a cheap, recyclable, and efficient photocatalyst to help degrade pollutants contaminating the environment. Herein, mesoporous molecular sieve titanium phosphate （MMS-TiP） was used as an efficient nano-photocatalyst to degrade 2,4-dichlorophenol （2,4-DCP） and to oxidize CO. The catalyst was successfully synthesized by a simple and convenient hydrothermal method in the presence of a tri-block copolymer surfactant. Exceptional photoactivity of the optimized MMS-TiP mainly depends on its porous structure, with a large surface area by means of O2 temperature-programmed desorption curves and fluorescence spectra related to the amounts of produced hydroxyl radical. Interestingly, the photocatalytic activity of the prepared MMS-TiP could be greatly improved by coupling with nanocrystalline SnO2. This is likely due to the increase in the lifetime and separation of photogenerated charges by transferring electrons to SnO2 and was observed by steady-state surface photovoltage spectra and time-resolved surface photovoltage responses. The SnOa-coupled MMS-TiP exhibits better photocatalytic performance for 2,4-DCP degradation and better self-settlement than those of the commercial catalyst P25 TiO2. Moreover, it was confirmed by radical-trapping experiments that ·O2^- is the main activated species for the photocatalytic degradation of 2,4-DCP, and is photogenerated by electron transfer from MMS-TiP to SnO2. Furthermore, the main intermediates in the degradation of 2,4-DCP, like parachlorophenol superoxide and 1,2-benzenediol superoxide radicals, were detected, and a possible decomposition pathway related to ·O2^- attack is proposed. These experimental results provide new strategies for developing a recyclable molecular sieve- based nano-photocatalyst with high photocatalytic activity for environmental remediation.
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