Reductive degradation of toxic six dyes in industrial wastewater using diaminobenzoic acid capped silver nanoparticles

The present work describes the reductive degradation of Phloxine B, Methyl Orange, Rhodamine B, Acriflavine, Auramine O, and Thymol Blue using silver nanoparticles as a catalyst. 3,4-diaminobenzoic acid capped silver nanoparticles (DAB-AgNPs) was synthesized by wet-chemical method. The obtained particles are spherical in shape, and their average diameter was calculated to be 9.2 +/- 0.19 nm by high-resolution transmission electron microscopy (HR-TEM) images. We have successfully applied DAB-AgNPs as a catalyst for the degradation of six different dyes and monitored their catalytic efficiency by UV-vis spectrophotometer. Interestingly, DAB-AgNPs shows the higher catalytic efficiency for the degradation of Phloxine B, Methyl Orange, Rhodamine B, Acriflavine, Auramine O, and Thymol Blue dyes. Further, we have performed the degradation of six dyes mixture using DAB-AgNPs. Finally, this system was applied for the degradation of the dyes in wastewater. Moreover, we have performed the total organic carbon (TOC) studies, before and after the degradation of dyes. The degradation mechanism also was discussed.