CAJ | 학술논문

采用沉淀-沉积法制备了PdO/CeO2催化剂,并使用X射线衍射、高分辨透射电镜、N2吸附-脱附等温线、X射线光电子能谱和Raman光谱对催化剂进行了表征.表征结果显示, Pd在复合物中以Pd2+形式存在； PdO和CeO2间的相互作用提高了CeO2中的Ce3+含量.通过酸性橙7和水杨酸的类芬顿降解考察了PdO/CeO2的多相类芬顿和可见光芬顿催化活性.结果表明, PdO沉积显著地促进了水杨酸的类芬顿降解,催化剂的PdO含量为1.0 at%时其活性最佳.染料酸性橙7在可见光照射条件下会引发染料光敏化效应.吸附的染料分子在光激发后通过界面电子注入促进了Ce3+自表面过氧物种的再生.由此, PdO负载和可见光照射的共同作用下,1.0 PdO/CeO2催化剂的酸性橙7类芬顿降解速率常数为3.90 h-1,为纯CeO2活性的50倍左右.
채용침정-침적법제비료PdO/CeO2최화제,병사용X사선연사、고분변투사전경、N2흡부-탈부등온선、X사선광전자능보화Raman광보대최화제진행료표정.표정결과현시, Pd재복합물중이Pd2+형식존재； PdO화CeO2간적상호작용제고료CeO2중적Ce3+함량.통과산성등7화수양산적류분돈강해고찰료PdO/CeO2적다상류분돈화가견광분돈최화활성.결과표명, PdO침적현저지촉진료수양산적류분돈강해,최화제적PdO함량위1.0 at%시기활성최가.염료산성등7재가견광조사조건하회인발염료광민화효응.흡부적염료분자재광격발후통과계면전자주입촉진료Ce3+자표면과양물충적재생.유차, PdO부재화가견광조사적공동작용하,1.0 PdO/CeO2최화제적산성등7류분돈강해속솔상수위3.90 h-1,위순CeO2활성적50배좌우.
A PdO/CeO2 catalyst was prepared by deposition‐precipitation method and characterized with X‐ray diffraction, high‐resolution transmission electron microscopy, N2 adsorption‐desorption, X‐ray photoelectron spectroscopy and Raman spectroscopy. The results show that the Pd is pre‐sented as Pd2+in the catalyst. The interaction between the deposited PdO and CeO2 increases the Ce3+content. The catalytic activity of PdO/CeO2 was tested in the heterogeneous Fenton‐like degra‐dation of acid orange 7 (AO7) and salicylic acid (SA), both in the dark and under visible irradiation. Deposition of PdO accelerates the Fenton‐like degradation of SA, which reaches a maximum at 1.0 atom%PdO loading. A dye sensitization effect was seen with AO7 under visible irradiation. Dye sensitization promotes the regeneration of Ce3+by interfacial peroxides species through interfacial electron injection. Consequently, the combined effects of PdO loading and visible light irradiating enhanced the Fenton‐like activity to a reaction rate constant of 3.90 h–1 for the 1.0 PdO/CeO2, a ca. 50‐fold improvement.