Simple preparation of polyaniline/SiC composite as an efficient photocatalyst for the reduction of Cr(VI)

Abstract

In order to enhance the photocatalytic activity of SiC, polyaniline (PANI) was utilized to modify it by constructing PANI/SiC heterojunction composite. PANI/SiC heterojunction composite was prepared via first mixing of SiC and PANI in solution and subsequent evaporation of the solvent. The photocatalytic performance of the as-prepared PANI/SiC composite in the reduction of Cr(VI) under xenon lamp irradiation was tested. The results indicated that combination with PANI can dramatically improve the photocatalytic activity of SiC. The as-prepared PANI/SiC composite not only had a photocatalytic activity 6.2 times as that of SiC, but also was more efficient than many recently reported photocatalysts in photocatalytic reduction of Cr(VI). Based on the adsorption and photoelectrochemical analysis results, it was deduced that the superior photocatalytic activity of PANI/SiC composite was attributed to its larger Cr(VI)-adsorbing capacity, higher light-absorbing ability, and more efficient separation and transfer of photogenerated electrons (h+) and holes (e–). Considering its simple preparation and excellent photocatalytic Cr(VI) reduction activity, the PANI/SiC photocatalyst is hopeful for practical application in Cr(VI) effluent treatment.