Degradation of Azo Dye Orange G by Oxalate Assisted-Photo-Fenton Method Using UV-A and Solar Light Irradiation

Abstract

Among various kind of AOPs Fenton’s reagent has been known to be an effective method for degrading organic compounds which can be enhanced by light irradiation and oxalic acid (OA) addition to be photo-ferrioxalate system This study aims to examine the use of photo-ferrioxalate process in degradation of Orange-G (OG) azo dye which is used widely in textile industries by using UV-A and Solar-LED irradiation In this study 30 ppm of OG were treated using photo-ferrioxalate system Operating variables included the initial iron concentration initial H2O2 concentration [OA]/[Fe3+] molar ratio and light irradiation The experimental results revealed that by using solar-LED light irradiation complete color removal was possible however only 47 50% TOC removal with TOC concentration of 9 04 ppm could be achieved after 420 min of reaction in the presence of 5 mg/L Fe3+ pHr= 5 186 mg/L H2O2 and [OA]/[Fe3+] = 3 While by using UV-A light irradiation with the same parameter condition higher TOC removal of 80 57% with TOC concentration of 4 16 ppm was obtained Rate constant of OG degradation was calculated and it was found that OG decolorization followed a pseudo-first order kinetic model

Date of Award	2019
Original language	English
Supervisor	Yao-Hui Huang (Supervisor)