简介概要

K2La2Ti3O10的制备和光催化产氢性能

来源期刊:中国有色金属学报2007年第4期

论文作者:杨亚辉 陈启元 尹周澜 李洁

文章页码:642 - 642

关键词:溶胶-凝胶法;光催化活性;氢气

Key words:sol-gel method; photocatalytic activity; hydrogen

摘    要:通过聚合?配合方法和溶胶-凝胶方法,制备了具有层状钙钛矿结构复合氧化物K2La2Ti3O10光催化剂,采用X射线衍射(XRD)、紫外-可见漫反射光谱(DRS)、扫描电镜(SEM)等手段进行表征;以I-为电子给体,比较了制备方法对K2La2Ti3O10分解水产氢活性的影响。研究结果表明,溶胶-凝胶法制备的K2La2Ti3O10比聚合?配合法制备的K2La2Ti3O10光催化产氢活性要高出1倍左右,且制备条件友好,所得K2La2Ti3O10具有较好的单相性;获得了以I-为电子给体,溶胶?凝胶法制备的K2La2Ti3O10分解水的最佳实验条件:产氢的最佳pH值为11.5,RuO2的负载量为0.2%~0.3%。

Abstract: An ion-exchangeable layered perovskite type oxide, K2La2Ti3O10, was prepared by polymerized complex method and sol-gel method and characterized by XRD, DRS and SEM, et al. The influence of preparation method on the photocatalytic reactivity of K2La2Ti3O10 for hydrogen production was studied while I- was used as electron donor. The optimum condition for water splitting was investigated when K2La2Ti3O10 prepared by sol-gel method was used as photocatalyst. The results show that, the sol-gel method has superiority compared with the polymerized complex method. When K2La2Ti3O10 prepared by sol-gel method is used as photocatalyst for water splitting, the hydrogen production rate is twice of that prepared by polymerized complex. The preparation condition is kind and it is easy to get single phase K2La2Ti3O10 photocatalyst with sol-gel method. When K2La2Ti3O10 is used as photocatalyst with I- as electron donor, the optimum water splitting condition is obtained as follows: pH value is 11.5, the amount of loading RuO2 on K2La2Ti3O10 photocatalyst is 0.2%-0.3%.

基金信息:国家“863”计划资助项目



详情信息展示

文章编号:1004-0609(2007)04-0642-07

K2La2Ti3O10的制备和光催化产氢性能

杨亚辉,陈启元,尹周澜,李  洁

(中南大学 化学化工学院,长沙 410083)

摘  要:通过聚合-配合方法和溶胶-凝胶方法,制备了具有层状钙钛矿结构复合氧化物K2La2Ti3O10光催化剂,采用X射线衍射(XRD)、紫外-可见漫反射光谱(DRS)、扫描电镜(SEM)等手段进行表征;以I-为电子给体,比较了制备方法对K2La2Ti3O10分解水产氢活性的影响。研究结果表明,溶胶-凝胶法制备的K2La2Ti3O10比聚合-配合法制备的K2La2Ti3O10光催化产氢活性要高出1倍左右,且制备条件友好,所得K2La2Ti3O10具有较好的单相性;获得了以I-为电子给体,溶胶-凝胶法制备的K2La2Ti3O10分解水的最佳实验条件:产氢的最佳pH值为11.5,RuO2的负载量为0.2%~0.3%。

关键词:溶胶-凝胶法;光催化活性;氢气

中图分类号:O 643.32       文献标识码:A

 

Preparation and photocatalytic activity of K2La2Ti3O10

YANG Ya-hui , CHEN Qi-yuan, YIN Zhou-lan, LI Jie

(College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China)

Abstract: An ion-exchangeable layered perovskite type oxide, K2La2Ti3O10, was prepared by polymerized complex method and sol-gel method and characterized by XRD, DRS and SEM, et al. The influence of preparation method on the photocatalytic reactivity of K2La2Ti3O10 for hydrogen production was studied while I- was used as electron donor. The optimum condition for water splitting was investigated when K2La2Ti3O10 prepared by sol-gel method was used as photocatalyst. The results show that, the sol-gel method has superiority compared with the polymerized complex method. When K2La2Ti3O10 prepared by sol-gel method is used as photocatalyst for water splitting, the hydrogen production rate is twice of that prepared by polymerized complex. The preparation condition is kind and it is easy to get single phase K2La2Ti3O10 photocatalyst with sol-gel method. When K2La2Ti3O10 is used as photocatalyst with I- as electron donor, the optimum water splitting condition is obtained as follows: pH value is 11.5, the amount of loading RuO2 on K2La2Ti3O10 photocatalyst is 0.2%-0.3%.

Key words: sol-gel method; photocatalytic activity; hydrogen

                    


1972年Honda[1]等通过TiO2光电转换将水分解为氢气,推动了光催化的发展。近几年来,利用半导体催化剂光解水制取氢气成为能源再生和存储的理想途径,采用光分解水制取氢气的研究[2-8]引起人们极大的兴趣。由于光催化材料的数量仍然有限,其催化活性偏低,因此,在利用半导体催化剂分解水制取氢气的研究过程中,制备新型高活性催化剂并拓展其对可见光的响应一直是人们的研究热点。层状钙钛矿结构的K2La2Ti3O10具有较好的光催化分解水的活性,现有的制备方法主要有聚合-配合法和高温固相法[9-15],而聚合-配合法制备的K2La2Ti3O10在紫外光辐射下分解纯水的产氢速率明显比高温固相法的高。K2La2Ti3O10以Ti为主体的催化材料,有望通过其他软化学方法(如溶胶-凝胶法)优化制备条件,稳定材料性能,进一步克服高温固相法合成的催化材料实验重现性差、性能不稳定等不足。在此,本文作者通过聚合-络合方法和溶胶-凝胶方法制备具有层状钙钛矿结构的复合氧化物K2La2Ti3O10催化剂,并采用TG-DTA、XRD、DRS和SEM等分析手段对催化剂进行表征,以I-为电子给体[16-17],比较制备方法对K2La2Ti3O10分解水产氢活性的影响,研究溶胶-凝胶法制备的K2La2Ti3O10光催化分解水产氢的实验条件。

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