TiO_2/AC复合材料的吸附性与光催化性能  

Adsorption and photocatalytic performance of TiO_2/AC composites

作　　者：李梦悦 房国丽[1] 张刚 魏杰[1] 郑功[3] LI Mengyue;FANG Guoli;ZHANG Gang;WEI Jie;ZHENG Gong(School of Materials Science and Engineering,Beifang Minzu University,Yinchuan 750021,China;Academic Journal Center,Ningxia University,Yinchuan 750021,China;Joint Laboratory of Nanostructured Materials and Technology,Nanjing University of Science and Technology,Nanjing 210094,China)

机构地区：[1]北方民族大学材料科学与工程学院,宁夏银川750021 [2]宁夏大学学术期刊中心,宁夏银川750021 [3]南京理工大学金属纳米联合实验室,江苏南京210094

出　　处：《河北大学学报（自然科学版）》2018年第5期480-489,共10页Journal of Hebei University(Natural Science Edition)

基　　金：宁夏自然科学基金资助项目(NZ17108);国家自然科学基金资助项目(51262001)

摘　　要：以煤基活性炭为原材料,采用浸渍-水热法合成TiO_2/AC复合材料,进一步分析TiO_2负载量对TiO_2/AC复合材料吸附性能和光催化活性的影响.结果表明:TiO_2负载量为10.2%时,TiO_2/AC复合材料对Rh B的单层饱和吸附量为19.5mg/g,高于煤基活性炭饱和吸附量13.8mg/g.紫外光辐照下,不同负载量的TiO_2/AC复合材料均表现出优异的光催化活性.TiO_2负载量为11.4%时,紫外光辐照2h后,TiO_2/AC复合材料对Rh B降解率为98.5%,远高于同等条件下P25光催化剂对Rh B的降解率(72.1%).这是由于活性炭和TiO_2之间的界面可以有效分离光生电子-空穴对,同时石墨化C的存在可以提高光生电子的迁移率,因此TiO_2/AC复合材料表现出明显优于P25的光催化活性.TiO 2/AC composites have been prepared by the impregnated-hydrothermal method,and coal-based activated carbon was used as raw material.The TiO 2 content in TiO 2/AC composites is an important affective factor for the adsorption and photocatalytic activities of TiO 2/AC composites.The monolayer adsorption capacities of the TiO 2/AC composites containing 0,10.2%,11.4%,12.6%and 13.2%are 13.8,19.5,18.3,16.9 and 16.8 mg/g,respectively.It is obvious that the TiO 2/AC composites containing 10.2%TiO 2 exhibited much highest adsorption performance.The photocatalytic activities of the TiO 2/AC composites have been evaluated by using Rh B as a model organic compound.With UV irradiation,the photodegradation efficiency of Rh B under TiO 2/AC composites containing 11.4%TiO 2 reached nearly 98.5%in 2 h,while this under P25 photocatalyst only reached 72.1%.It should be attributed to the strong interfacial interactions between activated carbon and TiO 2,which promoted the separation of photogenerated electron-hole pairs.Moreover,the presence of graphitized C could improve the photogenerated electron mobility rate.

关 键 词：负载TiO2活性炭复合材料(TiO 2/AC) 浸渍-水热法 吸附性 光催化活性 

分 类 号：TB321[一般工业技术—材料科学与工程]