Electrochemical decolorization of the reactive orange 16 dye using dimensionally stable Ti/PtOx anode

Abstract

Electrochemical decolorization of the Reactive Orange 16 was studied using dimensionally stable Ti/PtOx anode in the chloride containing solution. Different reaction parameters, agitation speed, applied current, sodium chloride concentration, and dye concentration was varied and optimum electrolysis conditions were suggested. The hypohlorous acid was suggested to be an active species in the electrochemical decolorization. Reaction was also studied using UV-Vis spectrophotometry, high-pressure liquid chromatography (HPLC), and total organic carbon (TOC) and total nitrogen (TN) analyses. [Projekat Ministarstva nauke Republike Srbije, br. ON172013 i br. ON172046]

Influence of microwave irradiation on hypochlorite decolorisation of synthetic dyes

“…The peaks at 254 and 386 nm are indicative of benzene ring and azo group, respectively. At the end, due to an azo-hidrazone tautomerism in RO16 molecule, the peak at 493 nm corresponds to the hydrazone form of the dye [37]. The decolorization of RO16 dye can be easily observed by decrease of the absorption peaks at 386 and 493 nm.…”

Noble metals doped tin dioxide for sodium hypochlorite synthesis from low concentrated NaCl solutions

“…In addition, the synthesis produces alkaline NaOCl solutions, which contain a significant number of impurities of chlorites and chlorates, so they are unsuitable for use in medicine and veterinary medicine. Materials such as oxides of cobalt (Co) and platinum (Pt), 4 obtained by classical sol–gel technology, do not have a high selectivity to the target product, so the resulting solutions are significantly contaminated with chlorates and chlorites. A similar problem is observed for lead oxide (PbO 2 ), 5 as well as different types of C anodes 6‐8 .…”