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کاتالیزور کاربردی a: عمومی 2012
جزئیات رویداد
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همایش ، رویداد ، ژورنال
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  • application of tio2-containing mesoporous spherical activated carbon in a fluidized bed photoreactor—adsorption and photocatalytic activity

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    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
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    a tio2-containing mesoporous spherical activated carbon (meso-tio2/sac) with high adsorption capacity and photocatalytic activity was prepared using ion-exchange method and heat-treatment process. the prepared meso-tio2/sac was characterized by sem, tem, eds, xrd, and bet analysis. results obtained showed that meso-tio2/sac had a smooth spherical shape (0.30–0.45 mm) and tio2 with crystalline size of 10–30 nm was well dispersed on the spherical activated carbon. xrd study confirmed that tio2 existed in a mixture of anatase (83%) and rutile (17%) phase. the meso-tio2/sac presented a high specific surface area of 1649 m2/g. the meso-tio2/sac was used for the removal of humic acid (ha) in a fluidized bed photoreactor, the rate of adsorption reaction of ha by meso-tio2/sac followed the pseudo second-order kinetic, the adsorption isotherm fitted well to the freundlich and langmuir isotherm models. the maximum adsorption capacity of meso-tio2/sac determined from langmuir isotherm was 2.92 mg/g. the effect of the photocatalysis of ha by meso-tio2/sac under uv irradiation was investigated under various conditions of varying catalyst dosage, initial ha concentration, and coexisting anion. ha was mineralized up to 80.3% under optimal experimental conditions for a catalyst dosage of 9 g/l and at an initial ha concentration of 20 mg/l. in the presence of coexisting anions, the degradation efficiency of ha was reduced to 72.1% and 72.8% for so42− and no3−, respectively. in the cyclic reuse experiment, over 85% of the initial toc and cod were removed after the eighth cycles, indicating the relatively high photocatalytic stability of meso-tio2/sac. tio2 was not released from the spherical activated carbon during the photocatalytic reaction. the meso-tio2/sac developed, therefore has potentials for practical applications in water treatment. 

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