Enhanced photocatalytic discoloration of acid fuchsine wastewater by TiO2/schorl composite catalyst

被引：32
作者：
Xu, Huan-Yan [1 ]
Zheng, Zhuo [2 ]
Mao, Gui-Jie [3 ]
机构：
[1] Harbin Univ Sci & Technol, Coll Mat Sci & Engn, Harbin 150040, Peoples R China
[2] Sichuan Univ, Coll Mat Sci & Engn, Chengdu 610064, Peoples R China
[3] Heilongjiang Univ, Sch Chem & Mat Sci, Harbin 150080, Peoples R China
来源：
JOURNAL OF HAZARDOUS MATERIALS | 2010年 / 175卷 / 1-3期
关键词：
TiO2; Schorl; Composite catalyst; Acid fuchsine; Discoloration; METHYL-ORANGE; DOPED TIO2; DEGRADATION; OXIDATION; TOURMALINE; FILMS; PERFORMANCE; POWDERS; RUTILE; FE;
D O I：
10.1016/j.jhazmat.2009.10.059
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
The existence of electrostatic poles' on the schorl surface encouraged us to apply schorl for a TiO2 support. TiO2/schorl composite photocatalyst was prepared and characterized by XRD, SEM and UV/DRS, and their photocatalytic activity was evaluated by discoloration of acid fuchsine (AF). The results indicated that TiO2 existed in the form of anatase and was well deposited and enwrapped on the schorl surface. The absorption edge of TiO2/schorl exhibited a slight red shift in the UV/DRS spectra, compared with that of pure TiO2. The photocatalytic activity of TiO2/schorl for AF discoloration was higher than that of pure TiO2. The AF discoloration ratio approached 100% after irradiation time of 12 h. The optimum photocatalyst was found to be that containing 4.76wt.% of schorl and sintered at 550 degrees C. The reaction followed pseudo-first-order kinetics, discussed by the Langmuir-Hinshelwood model. Hypotheses were proposed to interpret the mechanism for the enhanced photocatalytic activity of TiO2/schorl. (C) 2009 Elsevier B.V. All rights reserved.
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页码：658 / 665
页数：8
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