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      저자 : Sze-Mun Lam (검색결과 2 건)
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        Parameter effect on photocatalytic degradation of phenol using TiO2-P25/activated carbon (AC)

        Abdul Rahman Mohamed,Sze-Mun Lam,Jin-Chung Sin 한국화학공학회 2010 Korean Journal of Chemical Engineering Vol.27 No.4

        P25 powder embedded and TiO2 immobilized on activated carbon (TiO2-P25/AC) was prepared by P25powder modified sol-gel and dip-coated method. The photocatalysts were characterized by XRD, BET, SEM and their photocatalytic activities were evaluated through phenol degradation in a fluidized bed photoreactor. The addition of P25 in the photocatalysts could significantly enhance the photocatalytic activity, and the optimum loading of P25 was 3 g L−1. The operating parameter results indicated that the optimum pH for phenol degradation was 5.2; the effect of air flow rate gave an optimal value of 2 L min−1; the increasing of UV light intensity led to an increase of degradation efficiency due to more photons absorbed on the surface of the photocatalyst. The kinetics of the phenol degradation fitted well with the Langmuir-Hinshelwood kinetics model. Finally, the photocatalytic ability of TiO2-P25/AC was reduced only 10% after five cycles for phenol degradation.

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        Optimizing photocatalytic degradation of phenol by TiO_2/GAC using response surface methodology

        Jin-Chung Sin,Abdul Rahman Mohamed,Sze-Mun Lam 한국화학공학회 2011 Korean Journal of Chemical Engineering Vol.28 No.1

        TiO_2 deposited on granular activated carbon (TiO_2/GAC) was used for photocatalytic degradation of phenol. The effects of photocatalyst loading, initial substrate concentration and addition of an oxidizing agent as H-2O_2 were investigated using a one-factor-at-a-time experiment. Central composite design, an experimental design for response surface methodology (RSM), was used for the modelling and optimization of the phenol degradation. Analysis of variance (ANOVA) indicated that the proposed quadratic model was in agreement with the experimental case with R^2 and R^2_(adj) correlation coefficients of 0.9760 and 0.9544, respectively. Accordingly, the optimum conditions for phenol degradation were a photocatalyst loading of two layers, initial phenol concentration of 34.44 mg L^(−1) and H_2O_2 concentration of 326.90 mg L^(−1). The TiO_2/GAC was used for five cycles with phenol degradation efficiency still higher than 90%. Finally, the phenol that remained adsorbed on GAC was able to migrate to TiO_2 and then photocatalytically be degraded.

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