TiO2/AC复合材料的吸附性与光催化性能

doi:10.3969/j.issn.1000-1565.2018.05.006

摘要/Abstract

摘要： 以煤基活性炭为原材料,采用浸渍-水热法合成TiO₂/AC复合材料,进一步分析TiO₂负载量对TiO₂/AC复合材料吸附性能和光催化活性的影响.结果表明:TiO₂负载量为10.2%时,TiO₂/AC复合材料对Rh B的单层饱和吸附量为19.5 mg/g,高于煤基活性炭饱和吸附量13.8 mg/g.紫外光辐照下,不同负载量的TiO₂/AC复合材料均表现出优异的光催化活性.TiO₂负载量为11.4%时,紫外光辐照2 h后,TiO₂/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TiO₂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TiO₂/AC复合材料表现出明显优于P25的光催化活性.

关键词: 负载TiO₂活性炭复合材料(TiO₂/AC), 浸渍-水热法, 吸附性, 光催化活性

Abstract: TiO₂/AC composites have been prepared by the impregnated-hydrothermal method, and coal-based activated carbon was used as raw material. The TiO₂ content in TiO₂/AC composites is an important affective factor for the adsorption and photocatalytic activities of TiO₂/AC composites. The monolayer adsorption capacities of the TiO₂/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 TiO₂/AC composites containing 10.2% TiO₂ exhibited much highest adsorption performance. The photocatalytic activities of the TiO₂/AC composites have been evaluated by using Rh B as a model organic compound. With UV irradiation, the photodegradation efficiency of Rh B under TiO₂/AC composites containing 11.4% TiO₂ 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 TiO₂, which promoted the separation of photogenerated- DOI:10.3969/j.issn.1000-1565.2018.05.006TiO₂/AC复合材料的吸附性与光催化性能李梦悦¹,房国丽¹,张刚²,魏杰¹,郑功³(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)摘要:以煤基活性炭为原材料,采用浸渍-水热法合成TiO₂/AC复合材料,进一步分析TiO₂负载量对TiO₂/AC复合材料吸附性能和光催化活性的影响.结果表明:TiO₂负载量为10.2%时,TiO₂/AC复合材料对Rh B的单层饱和吸附量为19.5 mg/g,高于煤基活性炭饱和吸附量13.8 mg/g.紫外光辐照下,不同负载量的TiO₂/AC复合材料均表现出优异的光催化活性.TiO₂负载量为11.4%时,紫外光辐照2 h后,TiO₂/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TiO₂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TiO₂/AC复合材料表现出明显优于P25的光催化活性.关键词:负载TiO₂活性炭复合材料(TiO₂/AC);浸渍-水热法;吸附性;光催化活性中图分类号:TB321 文献标志码:A 文章编号:1000-1565(2018)05-0480-10Adsorption and photocatalytic performance of TiO₂/AC compositesLI Mengyue¹, FANG Guoli¹, ZHANG Gang², WEI Jie¹, ZHENG Gong³(1. School of Materials Science and Engineering, Beifang Minzu University, Yinchuan 750021,China;2. Academic Journal Center, Ningxia University, Yinchuan 750021,China; 3. Joint Laboratory of NanostructuredMaterials and Technology,Nanjing University of Science and Technology, Nanjing 210094,China )Abstract: TiO₂/AC composites have been prepared by the impregnated-hydrothermal method, and coal-based activated carbon was used as raw material. The TiO₂ content in TiO₂/AC composites is an important affective factor for the adsorption and photocatalytic activities of TiO₂/AC composites. The monolayer adsorption capacities of the TiO₂/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 TiO₂/AC composites containing 10.2% TiO₂ exhibited much highest adsorption performance. The photocatalytic activities of the TiO₂/AC composites have been evaluated by using Rh B as a model organic compound. With UV irradiation, the photodegradation efficiency of Rh B under TiO₂/AC composites containing 11.4% TiO₂ 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 TiO₂, which promoted the separation of photogenerated- 收稿日期:2017-11-02 基金项目: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) 第一作者:李梦悦(1993-),女,甘肃武威人,北方民族大学在读硕士研究生,主要从事半导体功能材料合成研究.E-mail: leeklee511@163.com 通信作者:房国丽(1982-),女,山西河津人,北方民族大学副教授,博士,主要从事半导体功能材料、超微粉体材料控制合成研究. E-mail: fangguoli999@163.com第5期李梦悦等:TiO₂/AC复合材料的吸附性与光催化性能electron-hole pairs. Moreover, the presence of graphitized C could improve the photogenerated electron mobility rate.

Key words: TiO₂/AC composites, impregnation-hydrothermal method, adsorption, photocatalytic activity

中图分类号:

TB321

李梦悦,房国丽,张刚,魏杰,郑功. TiO₂/AC复合材料的吸附性与光催化性能[J]. 河北大学学报(自然科学版), 2018, 38(5): 480-489.

LI Mengyue, FANG Guoli, ZHANG Gang, WEI Jie, ZHENG Gong. Adsorption and photocatalytic performance of TiO₂/AC composites[J]. Journal of Hebei University (Natural Science Edition), 2018, 38(5): 480-489.

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TiO₂/AC复合材料的吸附性与光催化性能

Adsorption and photocatalytic performance of TiO₂/AC composites

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