Phenol Adsorption and Photo-Oxidation on Porous Carbon/Titania Composites
Phenol Adsorption and Photo-Oxidation on Porous Carbon/Titania Composites
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DOI：
10.1260/0263-6174.28.8-9.727
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发表时间：
2010-11
影响因子：
2.9
通讯作者：
L. Velasco;J. Parra;C. Ania
中科院分区：
文献类型：
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作者：
L. Velasco;J. Parra;C. Ania
制备了不同负载量的碳/二氧化钛复合材料，并研究了其在稀水溶液中对苯酚的吸附和光氧化性能。将二氧化钛(P25，Degussa)固定在碳载体上，由于C/TiO2复合材料的多孔特性，苯酚的吸附速率增加。对于二氧化钛含量较低的样品，苯酚的吸附动力学非常快，而二氧化钛负载量超过20wt%时，存在一些操作问题，阻碍了其在水溶液中的应用。在无光照条件下表现出较高吸附速率的C/TiO2光催化剂，在紫外光照射下苯酚从水溶液中消失的速度较快，同时生成的中间体也较少。含10-15wt%二氧化钛的C/TiO2光催化剂的脱色率接近100%，苯酚优先氧化生成邻苯二酚。
Carbon/titania composites with different loadings were prepared and investigated for phenol adsorption and photo-oxidation from dilute aqueous solutions. The rate of phenol adsorption increased when titanium oxide (P25, Degussa) was immobilized on the carbon support due to the porous features of the resulting C/TiO2 composites. The kinetics of phenol adsorption were very fast for samples containing low titanium oxide contents, whereas titania loadings above 20 wt% presented some operational problems that prevented their application in aqueous solutions. Those C/TiO2 composites which exhibited higher adsorption rates in the absence of illumination also showed a more rapid disappearance of phenol from aqueous solution under UV light, together with the formation of lower amounts of intermediates. Removal efficiencies close to 100% were obtained for C/TiO2 composites containing ca. 10–15 wt% titanium oxide, with preferential oxidation of phenol through the formation of catechol.