title: Immobilization of self-assembled pre-dispersed nano-TiO2 onto montmorillonite and its photocatalytic activity.
abstract: The immobilization of pre-dispersed TiO2 colloids onto the external surface of the clay mineral montmorillonite (Mt) was accomplished and regulated via a self-assembly method employing the cationic surfactant cetyltrimethylammonium bromide (CTAB). The role of CTAB in the synthesis process was investigated by preparing a series of TiO2-CTAB-Mt composites (TCM) with various CTAB doses. The results indicated that a uniform and continuous TiO2 film was deposited on the external surface of montmorillonite in the composite synthesized with 0.1 wt.% of CTAB, and the TCM nano-composites showed much higher values for specific surface area, average pore size and pore volume than the raw montmorillonite clay. Then, the formed TCM materials were applied in photocatalytic degradation of 2,4-dichlorophenol (2,4-DCP) in aqueous solution. The degradation efficiency reached as high as 94.7%. Based on the degradation intermediates benezoquinone, fumaric acid and oxalic acid identified by LC-MS analysis, a mechanism for the photocatalytic oxidation of 2,4-DCP on TiO2/Mt nano-composites is proposed.
authors.affiliation: Research Group of Environmental Catalysis & Separation Process, College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China. Electronic address: zhangtt@mail.buct.edu.cn.
authors.forename: Tingting
authors.initials: T
authors.lastname: Zhang
authors.affiliation: Research Group of Environmental Catalysis & Separation Process, College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China.
authors.forename: Yuan
authors.initials: Y
authors.lastname: Luo
authors.affiliation: Research Group of Environmental Catalysis & Separation Process, College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China.
authors.forename: Bing
authors.initials: B
authors.lastname: Jia
authors.affiliation: Research Group of Environmental Catalysis & Separation Process, College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Li
authors.affiliation: Research Group of Environmental Catalysis & Separation Process, College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China.
authors.forename: Lingling
authors.initials: L
authors.lastname: Yuan
authors.affiliation: Research Group of Environmental Catalysis & Separation Process, College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China. Electronic address: yujiangbuct@163.com.
authors.forename: Jiang
authors.initials: J
authors.lastname: Yu
mesh_terms: D001546:Bentonite / Q000737:chemistry*; D002384:Catalysis; D008855:Microscopy, Electron, Scanning; D053758:Nanoparticles / Q000737:chemistry*; D055668:Photochemical Processes; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry*; D062065:Wastewater / Q000032:analysis* / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods*; D014961:X-Ray Diffraction
chemical_list: D001546:Bentonite; D014025:Titanium; D062065:Wastewater; D014874:Water Pollutants, Chemical; C009495:titanium dioxide
keywords: CTAB; Immobilization; Photocatalysis; TiO(2)/Mt composite