Study on photocatalytic degradation of basic violet and mechanism in UV/TiO2 suspension system
Received date: 2004-01-16
Online published: 2010-10-01
The photocatalytic degradation of basic violet in UV/TiO2 system is focused on in this study. The effects of the concentration of basic violet, pH value and additive inorganic salt on degradation effeciency have been investigated. The experimental results show that when the initial concentrations of basic violet are 20.0 mg/L, 30.0 mg/L, 40.0 mg/L respectively, the remains of basic violet are 1.8 mg/L, 2.3 mg/L, 3.4 mg/L correspondingly after irradiated for 180 min. The highest and the lowest degradation effeciency are observed when pH value is 9.00 and 3.00 respectively. The inorganic salt has negative impact to different extent on degradation of basic violet. The exploration of the degradation mechanism indicates that photocatalytic degradation takes place on the surface of the photocatalysts.
Key words: ultraviolet/titanium; dioxide; photocatalysis basic violet
Fang Jianzhang, Li Hao, Liao Jinyun . Study on photocatalytic degradation of basic violet and mechanism in UV/TiO2 suspension system[J]. Industrial Water Treatment, 2004 , 24(8) : 18 -22 . DOI: 10.11894/1005-829x.2004.24(8).18
[1] Fujishima A, Honda K. Electrochemical photolysis of water at a semiconductor electrode [J]. Nature, 1972,238 (5 358): 37 - 38
[2] Wang K H, Hsieh Y H, Chou M Y, et al. Photocatalytic degradation of 2 - chloro and 2 - nitrophenol by titanium dioxide suspensions in aqueous solution [J]. Appl. Catal. B, 1999,21 (1): 1 - 8
[3] Okte A N, Resat M S, Inel Y. Photocatalytic degradation of 1,3-Dihydroxy- 5- methoxybenzene in aqueous suspensions of TiO2:a initial kinetic study[J]. J. Catal., 2001,198(2): 172-178
[4] Idil A, Isil A B, Detlef W B. Heterogeneous photo-catalytic treatment of simulated dyehouse effluents using novel TiO2-photocatalysts [J].Appl. Catal. B: environmental, 2000,26 (3): 193 - 206
[5] David F O, Ezio P, Nick S. Destruction of water contaminates[J].Environ. Sci. Technol., 1991,25(9): 1 523-1 529
[6] Rita T, Nick S, Claudio M, et al. Kinetic studies in heterogeneous photocatalysis 4. The photomineralization of a hydroquinone and a catechol [J]. J. Photochem. Photobiol. A: Chem., 1990,55 (2):243 -249
[7] Shea K E O′,Pernas E, Saiers J. The influence of mineralization products on the coagulation of TiO2 photocatalyst[J]. Langmuir, 1999,15(6):2 071-2 076
[8] Rita T, Nick S, Claudio M, et al. Photocatalyzed mineralization of cresols in aqueous media with irradiated titania[J]. J. Catal., 1991,128(2) :352-365
[9] Ward M D,White J R, Bard A J. Electrochemical investigation of the energetics of particulate TiO2 photocatalysts. The methyl viologen - acetate system[J]. J. Am. Chem. Soc., 1983,105(1): 27 - 31
[10] Yang T C-K, Wang S-F, Tsai S H-Y, et al. Intrinsic photoca-talytic oxidation of the dye adsorbed on TiO2 photocatalysts by diffuse reflectace infrared fourier transform spectroscopy[J]. Appl.Catal. B, 2001,30(3/4): 293-301
[11] Soonhyun K, Wongyong C. Kinetics and mechanisms of photocatalytic degradation of(CH3)nNH4-n+ (0 ≤n ≤4) in TiO2 suspension: The role of OH radicals[J]. Environ. Sci. Technol., 2002,36(9):2 019-2 025
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