Synthesis, characterization and UV-A light photocatalytic activity of 20 wt%SrO-CuBi₂O₄ composite

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• 作者：Elaziouti Abdelkader^a ; ^{elaziouti_a@yahoo.com} ; Laouedj Nadjia^b ; ^{nlaouedj@yahoo.fr} ; Bekka Ahmed^a ; ^{bekka_ahmed@hotmail.com}
• 关键词：20  ; wt%SrO&ndash ; CuBi2O4 composite ; TG/TDA ; XRD ; EDX ; SEM ; Electrical measurements ; Congo red ; Photocatalytic activity ; p&ndash ; n heterojunction
• 刊名：Applied Surface Science
• 出版年：2012
• 期刊代码：6_01694332
• 类别：ms
• 出版时间：1 April, 2012
• 卷：258
• 期：12
• 页码：5010-5024
• 文件大小：1584 K

摘要

A novel nanoscale powder 20 wt%SrO-CuBi₂O₄ has been successfully synthesized for the first time by ion exchange through doping Sr(NO₃)₂ into CuBi₂O₄ matrix and characterized using TG/DTA, XRD, EDX, SEM and electrical measurements. The as-prepared 20 wt%SrO-CuBi₂O₄ composite exhibit much higher photocatalytic activity than 20 wt%SrO-CuBi₂O₄ synthesized via physical process and pure phase CuBi₂O₄ under UV-A light irradiation (位 = 365 nm) in the course of the photocatalytic redox activity of Congo red (CR). Maximum degradation was achieved within 220 min of irradiation time under UV-A light as a result of 97.22%of photocatalytic efficiency of CR. The mechanisms of the enhancement of photocatalytic activity of the nanocomposite photocatalyst will be discussed by the p-n heterojunction principle (charge separation and photochemical diode models) and the valance band theory. The pure nanocomposite systems have been also reported for a comparative purpose.