Abstract
A series of Mn3O4-BiOCl nanophotocatalysts has been synthesized in present research and their photocatalytic activity was examined toward AO7 photomineralization as a representative of azo dyes. The photocatalysts physicochemical and optical properties were analysed by different characterization methods including XRD, FTIR, FESEM, PSD, DRS, EDX and BET. The photocatalytic experiments illustrate that Mn3O4(5)-BiOCl(95) possess much better photoactivity than pure BiOCl, Mn3O4. It is basically ascribed to formation of p-p type heterojunction with matching band gaps alignments, which greatly promotes separation of photoinduced charge carriers. The possible photocatalytic mechanism was also rendered for this novel binary nanocomposite. Operational factors consist of catalyst loading, dye concentration and preliminary pH have been investigated. The reusability tests were done in four cycles. The results showed almost same photoactivity in each run. The XRD post characterization was done after 4 cycles. It didn’t show any changes in XRD pattern of used sample compared to fresh one which confirmed high stability of new nanocomposite.
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