title: In situ hydrothermal synthesis of a novel hierarchically porous TS-1/modified-diatomite composite for methylene blue (MB) removal by the synergistic effect of adsorption and photocatalysis.
abstract: Hierarchically porous TS-1/modified-diatomite composites with high removal efficiency for methylene blue (MB) were prepared via a facile in situ hydrothermal route. The surface charge state of the diatomite was modified to enhance the electrostatic interactions, followed by in situ hydrothermal coating with TS-1 nanoparticles. The zeolite loading amount in the composites could be adjusted by changing the hydrothermal time. The highest specific surface area and micropore volume of the obtained composites were 521.3m(2)/g and 0.254cm(3)/g, respectively, with an optimized zeolite loading amount of 96.8%. Based on the synergistic effect of efficient adsorption and photocatalysis resulting from the newly formed hierarchically porous structure and improved dispersion of TS-1 nanoparticles onto diatomite, the composites' removal efficiency for MB reached 99.1% after 2h of photocatalytic reaction, even higher than that observed using pure TS-1 nanoparticles. Moreover, the superior MB removal kinetics of the composites were well represented by a pseudo-first-order model, with a rate constant (5.28×10(-2)min(-1)) more than twice as high as that of pure TS-1 nanoparticles (2.43×10(-2)min(-1)). The significant dye removal performance of this novel TS-1/modified-diatomite composite indicates that it is a promising candidate for use in waste water treatment.
authors.affiliation: CAS Key Laboratory of Mineralogy and Metallogeny, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Wushan, Guangzhou 510640, China; University of Chinese Academy of Sciences, Beijing 100039, China; Guangdong Provincial Key Laboratory of Mineral Physics and Materials, Wushan, Guangzhou 510640, China.
authors.forename: Weiwei
authors.initials: W
authors.lastname: Yuan
authors.affiliation: CAS Key Laboratory of Mineralogy and Metallogeny, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Wushan, Guangzhou 510640, China; Guangdong Provincial Key Laboratory of Mineral Physics and Materials, Wushan, Guangzhou 510640, China. Electronic address: yuanpeng@gig.ac.cn.
authors.forename: Peng
authors.initials: P
authors.lastname: Yuan
authors.affiliation: CAS Key Laboratory of Mineralogy and Metallogeny, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Wushan, Guangzhou 510640, China; Guangdong Provincial Key Laboratory of Mineral Physics and Materials, Wushan, Guangzhou 510640, China.
authors.forename: Dong
authors.initials: D
authors.lastname: Liu
authors.affiliation: CAS Key Laboratory of Mineralogy and Metallogeny, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Wushan, Guangzhou 510640, China; University of Chinese Academy of Sciences, Beijing 100039, China; Guangdong Provincial Key Laboratory of Mineral Physics and Materials, Wushan, Guangzhou 510640, China.
authors.forename: Wenbin
authors.initials: W
authors.lastname: Yu
authors.affiliation: CAS Key Laboratory of Mineralogy and Metallogeny, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Wushan, Guangzhou 510640, China; University of Chinese Academy of Sciences, Beijing 100039, China; Guangdong Provincial Key Laboratory of Mineral Physics and Materials, Wushan, Guangzhou 510640, China.
authors.forename: Minwang
authors.initials: M
authors.lastname: Laipan
authors.affiliation: CAS Key Laboratory of Mineralogy and Metallogeny, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Wushan, Guangzhou 510640, China; University of Chinese Academy of Sciences, Beijing 100039, China; Guangdong Provincial Key Laboratory of Mineral Physics and Materials, Wushan, Guangzhou 510640, China.
authors.forename: Liangliang
authors.initials: L
authors.lastname: Deng
authors.affiliation: CAS Key Laboratory of Mineralogy and Metallogeny, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Wushan, Guangzhou 510640, China; Guangdong Provincial Key Laboratory of Mineral Physics and Materials, Wushan, Guangzhou 510640, China.
authors.forename: Fanrong
authors.initials: F
authors.lastname: Chen
keywords: Hierarchically porous structure; In situ hydrothermal method; Methylene blue; Synergistic effect; TS-1/modified-diatomite composite