摘要
利用光化学还原法制备载铂Sr(Zr1-xYx)O3-δ-TiO2(Pt-SZYT)异质结光催化剂,采用XRD,SEM,UV-Vis,PL对催化剂的形貌及性能进行表征.以工业有机污染物草酸为电子给体,模拟太阳光下光催化产氢为探针,评价了催化剂的活性.研究了载铂量、草酸浓度对催化剂产氢活性的影响,并探讨了Pt-SZYT催化剂产氢活性与光致发光(PL)性能的关系,以及催化剂的连续使用效果.结果表明:模拟太阳光条件下,Pt-SZYT催化剂具有良好稳定的光催化产氢活性,催化剂的最佳载铂量为0.90wt%.PL分析表明Pt-SZYT的光催化产氢活性越高,其荧光强度越弱.草酸50mmol·L-1,催化剂用量1.0g·L-1时,催化剂(w=0.90%)Pt-SZYT-70的平均产氢速率为1.68mmol·h-1.
The Pt-Sr（Zr1-xYx）O3-δ-TiO2 （Pt-SZYT） heterojunction photocatalysts were prepared by a photodeposition method. The composite particles were characterized by XRD, SEM, UV-vis and PL techniques. Photocatalytic hydrogen generation in oxalic acid aqueous solution under the irradiation of simulated sunlight was used as a probe reaction to evaluate the photocatalytic activity of the photocatalysts. The effects of the content of Pt loading and the concentration of oxalic acid on the photocatalytic activity of the catalyst were discussed. The continuous photocatalytic activity of the Pt-SZYT and the relationship between PL in- tensity and hydrogen generation were also discussed. The results show that Pt-SZYT catalysts had high photocatalytic activity of hydrogen generation. The content of Pt loading and the concentration of oxalic acid have important influence on the photocatalytic hydrogen generation. The optimal loading content of platinum was 0.90 wt%. Under this condition, the average rate of photocatalytic hydrogen generation was 1.68 mmoloh-1 when the concentration of oxalic acid was 50 mmoloL-1. The higher the photocatalytic activity, the weaker the PL intensity, which was demonstrated by the analysis of PL spectra.
出处
《化学学报》
SCIE
CAS
CSCD
北大核心
2008年第8期879-884,共6页
Acta Chimica Sinica
基金
湖南省自然科学基金(No.05JJ30018)资助项目
关键词
异质结
光催化
产氢
铂
草酸
heterojunction
photocatalysis
hydrogen generation
Pt
oxalic acid
作者简介
E-mail： yanjh58@ 163.com
