Open AccessPhotodegradation Kinetics and Color Removal of 2-(4-hydroxyphenylazo) Benzoic Acid by Advanced Oxidation Processes
Author(s) -
Yeliz Karaman,
Emine Baltaci
Publication year - 2021
Publication title -
chemical science international journal
Language(s) - English
Resource type - Journals
ISSN - 2456-706X
DOI - 10.9734/csji/2021/v30i230217
Subject(s) - hydrogen peroxide , benzoic acid , chemistry , photodegradation , sodium hypochlorite , kinetics , photochemistry , ultraviolet , irradiation , nuclear chemistry , photocatalysis , catalysis , materials science , organic chemistry , physics , optoelectronics , quantum mechanics , nuclear physics
Degradation kinetics and color removal of 2-(4-hydroxyphenylazo)benzoic acid azo dye by the hydrogen peroxide/ultraviolet irradiation and sodium hypochlorite/ultraviolet irradiation processes were carried out in Spectroline CM-10A Model ENF-260C/FE photoreactor which has ultraviolet lamps irradiating at 254 and 365 nm wavelengths. All experimental studies were performed at room temperature in 0.04 M Britton Robinson buffer (pH 2-12). For this purpose, the degradation kinetics of 2-(4-hydroxyphenylazo)benzoic acid was investigated depending on pH, initial dye concentration and hydrogen peroxide concentration. Optimum pH and hydrogen peroxide concentration were determined as pH 10 and 3.57x10-2 M, respectively, for 3.5x10-5 M 2-(4-hydroxyphenylazo)benzoic acid. Optimum pH value in 1.55x10-3 M sodium hypochlorite medium has been found as pH 8 for 3.5x10-5 M azo dye. These methods used for degradation of dye are compared, it is concluded that sodium hypochlorite/ultraviolet irradiation and sodium hypochlorite methods are more effective than hydrogen peroxide/ultraviolet irradiation and hydrogen peroxide methods because of color removal of 83% and 64%, respectively.