Madhu G M, Raj M A Lourdu Antony, Pai K Vasantha Kumar
Department of Chemical Engineering, R.V. College of Engineering, Bangalore, India.
J Environ Biol. 2009 Mar;30(2):259-64.
The aqueous solution of methylene blue (MB) has been subjected to Photocatalytic degradation by UV radiation in presence of TiO2 photo-catalyst containing different concentrations of H2O2. The experiments conducted at different dye concentrations (12 and 20 ppm), catalyst loading, pH and H2O2 dosage (1-10 ml l(-1)), revealed that the degradation rate is strongly influenced by respective experimental parameters. However the influence of catalyst alone is not predominant in degradation. The decolorization of dye proceed to near completeness when H2O2 is used. The best degradation results are observed at 0.1 wt% of catalyst loading at pH 2 for TiO2/UV system. It has been found that the optimum concentration of H2O2 for 12 ppm and 20 ppm amount of the dye was 2 ml l(-1) for UV/H2O2 system. The kinetic of degradation of the dye followed the pseudo first order rate. The degradation studies using TiO2/UV/H2O2 system, indicates enhancement in the degradation rate of the dye compared to that of UV/H2O2 system alone.
在含有不同浓度过氧化氢的二氧化钛光催化剂存在下，亚甲基蓝（MB）水溶液已通过紫外线辐射进行光催化降解。在不同染料浓度（12和20 ppm）、催化剂负载量、pH值和过氧化氢用量（1 - 10 ml l(-1)）下进行的实验表明，降解速率受各自实验参数的强烈影响。然而，单独催化剂的影响在降解中并不占主导地位。当使用过氧化氢时，染料的脱色接近完全。在TiO2/UV体系中，在pH值为2、催化剂负载量为0.1 wt%时观察到最佳降解结果。已发现，对于UV/H2O2体系，12 ppm和20 ppm染料量的过氧化氢最佳浓度为2 ml l(-1)。染料的降解动力学遵循准一级速率。使用TiO2/UV/H2O2体系的降解研究表明，与单独的UV/H2O2体系相比，染料的降解速率有所提高。
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