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活性炭负载I-TiO2对气体中甲苯的吸附 被引量:1

Adsorption of toluene in gas using loaded I-TiO_2 activated carbon
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摘要 利用溶胶凝胶-浸渍烧结法制备了碘掺杂二氧化钛修饰的活性炭复合吸附剂。利用XRD、SEM、BET、Boehm滴定、亚甲蓝吸附值等手段研究了活性炭负载前后表面结构与性质。利用动态吸附实验研究了活性炭负载I-TiO_2复合材料(IT/AC)和再生IT/AC对气体中甲苯的吸附。考察了活性炭粒径、气体的流速、吸附床层高度和气体中甲苯的浓度对活性炭吸附性能的影响及甲苯在活性炭固定床上的吸附动力学。结果表明:由于介孔I-TiO_2和活性炭的协同作用,负载适量I-TiO_2对活性炭结构和吸附性能影响较小。活性炭的粒径越小、复合材料的吸附穿透点和饱和吸附量越大;气体的流速和甲苯的初始浓度越大,复合材料的吸附穿透点越小但饱和吸附量越大。YOON-NELSON模型可以预测复合材料吸附甲苯的动力学过程。 An I-TiO_2/activated carbon( IT/AC) composite adsorbent was prepared through a sol-gel and dipping sintering method. The activated carbon samples before and after the loading were characterized via X-ray diffraction,scanning electron microscopy,Brunauer-Emmett-Teller analysis,Boehm titration,and adsorption values of methylene blue. The adsorption of toluene in gas by IT/AC and the regenerated ones were investigated through a dynamic adsorption experiment. The influences of particle size of AC,gas flow,bed length,and toluene concentration on the breakthrough curves and kinetics of toluene adsorption onto an activated carbon fixed bed were studied. The results showed that loading a certain amount of I-TiO_2 has little influence on the structure and adsorption properties of activated carbon because of the synergy of mesoporous I-TiO_2 and activated carbon.A smaller particle size of activated carbon led to a greater adsorption breakthrough point and adsorption capacity.When the fluid flow speed and initial concentration of toluene increased,the amount of saturated absorption increased and the adsorption breakthrough point decreased. The YOON-NELSON model was found to fit the breakthrough curves well.
出处 《环境工程学报》 CAS CSCD 北大核心 2016年第12期7147-7155,共9页 Chinese Journal of Environmental Engineering
基金 国家自然科学基金资助项目(51578295) 江苏省环保科技专项基金资助项目(2013002) 化工污染控制与资源化江苏省高校重点实验室(南京理工大学)创新基金(30920140122008) 江苏省物质循环与污染控制重点实验室资助项目 江苏生物医药功能材料协同创新中心资助项目 江苏高校优势学科建设工程和南京师范大学光电重点实验室基金资助项目
关键词 活性炭 吸附 甲苯 I-TiO2 透过 activated carbon adsorption toluene I-TiO2 breakthrough
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