【摘要】 采用凝胶溶胶法制备了负载S-TiO2的改性活性炭,考察了气固流化床光催化再生饱和吸附亚甲蓝的活性炭的可行性.研究了改性条件、再生时间、催化剂活性和再生次数对再生效果的影响.结果表明,S-TiO2负载量为6.5%,煅烧温度为450℃的改性活性炭经250 W汞灯光照12 h后再生率可以达到65.8%.在紫外光照下,改性活性炭表面的亚甲蓝降解中心与活性炭内部亚甲蓝的浓度差是气固流化床光催化再生活性炭的主要驱动力.更多还原

【Abstract】 The modified activated carbon loaded with S-TiO2 was synthesized by sol-gel method,and it was a kind of new activated carbon absorbent.The technical feasibility of photocatalytic regeneration for activated carbon saturated with MB with gas-solid fluidized-bed reactor was investigated by using S-TiO2 as photocatalysts.The factors affecting the regeneration efficiency of the activated carbon were investigated,including modifying conditions,regeneration times,photocatalyst modification,and adsorption-regeneration cycles.Based on the regeneration rate of activated carbon under different conditions,the regeneration mechanism was discussed.It was possible to regenerate the activated carbon through photocatalytic oxidation with gas-solid fluidized-bed reactor.The MB adsorption capacity of activated carbon calcinated at 450℃ with 6.5%(S-TiO2) loading could be recovered by 65.8%,when irradiated by 250 W UV lamp for 12 h.The difference of MB concentration between interior and exterior of activated carbon was the main driving force for photocatalytic regeneration.更多还原