Abstract
The present research reports on design of mesoporous ZnAl2O4 nanophotocatalysts using various weight percentages of activated charcoal as a carbonaceous template in template-aided microwave-combustion method. The nanophotocatalysts were characterized through XRD, FESEM, TEM, EDX, BET-BJH, DRS, PL and pHpzc analyses. The characterization results demonstrated spongy-like and partially incomplete crystalline spinel structure of ZnAl2O4 nanophotocatalyst resulting from the formation of the more and larger secondary voids beside combustion pores with the suitable appeared surface and structural defects was successfully designed. Accordingly, the reaction pathway for hard-templating design of mesoporous ZnAl2O4 through microwave-combustion method was proposed. Moreover, to investigate the photocatalytic application of the prepared samples, the adsorption and photo-degradation proficiency of high-concentration orange II (AO7), congo red (CR) and methylene blue (MB) were tested. Within 160 min of simulated sunlight exposure, ZnAl2O4(AC = 5) sample showed the outstanding AO7 degradation of 85.7% which is about 22% higher than the sample prepared without using AC (ZnAl2O4(AC = 0)).
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