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Title: |
Solar-Light-Induced Photocatalytic Degradation of 2-sec-butyl-4,6-dinitrophenol (dinoseb) on TiO2/MWCNTs Composite Ahotocatalyst |
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Source: |
The Second China Energy Scientist Forum (CESF 2010 E-BOOK)
(pp 282-288)
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Author(s): |
Zheqi Li, Environmental Science & Engineering Institute, Dalian Jiaotong University Dalian, China, 116023
Huilong Wang, Department of Chemistry, Dalian University of Technology Dalian, China, 116023 |
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Abstract: |
Solar photocatalytic degradation of 2-sec-butyl-4,6-dinitrophenol (dinoseb) in aqueous solution by TiO2/MWCNTs composite particles was investigated. The prepared TiO2/MWCNTs composite photocatalyst was characterized by XRD, FT-IR, SEM, TEM and UV-vis absorption spectra techniques. The effects of pH, irradiation time, catalyst loading, initial substrate concentration, MWCNTs content and temperature were systematically investigated as operational parameters. The effects of these parameters on the photocatalytic degradation efficiency were found to be significant. Experiment results revealed that the optimal conditions were a dinoseb concentration of 45.3 mg/L at pH 4.30 ± 0.02 with catalyst loading of 10.0 g/L under solar irradiation for the illumination of 240 min. The highest efficiency on photodegradation of dinoseb can be achieved with an optimal MWCNTs/TiO2 mass ratio of 0.14%. The photocatalytic degradation of dinoseb followed pseudo-first-order kinetics according to the Langmuir-Hinshelwood model and possible decomposing mechanisms were also discussed. The repeatability of photocatalytic activity was also tested. The photocatalyst was used for seven cycles with photocatalytic degradation efficiency still higher than 95%. The results of the study showed the feasible and potential use of TiO2/MWCNTs composite in degradation of toxic organic pollutants.
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