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- W2358045708 abstract "This paper aimed to study the kinetic on photocatalytic oxidation of microcystin-LR with TiO_2-coated activated carbon. As a matter of fact, the chemical properties of microcystin is stable, posed a serious threat to the safety of drinking water, while simple biological oxidation or adsorption can not be removed the MCs effectively. In this study, granular activated carbon was selected as the TiO_2 supporter, the immobilized catalyst activated carbon supported TiO_2 (TiO_2/GAC) was prepared by the sol-gel method, then the MCLR degradation experiments were investigated under the different experimental conditions whether the existence of UV or not, and whether the existence of activated carbon or not. The results indicated that MCLR won't self-degradation under the UV irradiation and won't be degraded by UV without activated carbon. After adding activated charcoal, about 50% of MCLR was adsorbed in 30 minutes, the adsorption equilibrium time was about 90min, and it was no effect on the adsorption properties of activated carbon under UV irradiation. Furthermore, the experiments of adsorption and oxidation on the removal of microcystin-LR were studied with this catalyst, then the process of adsorptive were fitted by the quasi second-rder of Lagergren model and the internal particles diffusion model, and the process of photocatalytic degradation was fitted by Langmuir-Hinshelwood model and Freundlich-Hinshelwood model. The results showed that the adsorption and oxidation processes were explained by quasi second-order of Lagergren and Langmuir-Hinshelwood models respectively. The correlation coefficient of quasi second-order of Lagergren model fitting was about 0.99, which was higher than the internal particles diffusion model's, so the chemical adsorption is the main factor to control the adsorption rate. In the process of Langmuir-Hinshelwood model fitting for the different initial concentrations of MCLR, the adsorption equilibrium constant (K_L) kept invariant ((0.0570±0.0008)L/μg), while degradation rate constant would gradually dwindle with the increase of the initial concentration of MCLR." @default.
- W2358045708 created "2016-06-24" @default.
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- W2358045708 date "2011-01-01" @default.
- W2358045708 modified "2023-09-23" @default.
- W2358045708 title "Kinetic study on photocatalytic oxidation of microcystin-LR with TiO_2-coated activated carbon" @default.
- W2358045708 hasPublicationYear "2011" @default.
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