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کاتالیزور کاربردی a: عمومی 2012
جزئیات رویداد
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همایش ، رویداد ، ژورنال
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  • bimodal n-doped p25-tio2/ac composite: preparation, characterization, physical stability, and synergistic adsorptive-solar photocatalytic removal of sulfamethazine

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    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 965
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    • شماره تماس دبیرخانه رویداد: -
     a novel nitrogen-doped p25-tio2 of bimodal structure with activated carbon supported (n-p25-tio2/ac) was synthesized via the modified sol–gel techniques. besides adding urea as n-source, the n-doping could also be induced through calcination under mixed nh3/n2 atmosphere. the composite was characterized using xrd, porosimetry, uv–vis spectrophotometry, ftir, xps, sem/edx and tem. the physical stability of the composite was examined through ultrasonication disruption, and the composite exhibited good physical stability. the synergistic effects of the adsorption-solar photocatalysis of sulfamethazine (smz) as exhibited by the composites were examined. the best performing bimodal composite was n-p25-tio2 (25 + 10)/ac, which comprised 25% of n-p25 and 10% n-tio2 (sol) by weight composition (wt%). the maximum adsorption capacity (smax) for the n-p25-tio2 (25 + 10)/ac, at ph 3.0, 6.0 and 10.0 was 183 ± 3, 194 ± 3, and 103 ± 2 mg g−1, respectively. the effects of the total loading of n-doped titania, sol–gel synthesis technique, weight distribution of n-p25 and n-tio2 (sol), composite dosage, light wavelength spectrum and solution ph on the photocatalytic degradation (pcd) of smz were investigated. the n-p25-tio2 (25 + 10)/ac composite exhibited enhanced pcd efficiency under solar irradiation with a pseudo first-order rate constant (kapp) of 0.48 h−1, as compared to other types of bimodal composites because its higher n-p25 content led to a greater photocatalytic activity.

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