Determination of hydroxyl radical in organic wastewater treatment by electrochemical oxidation |
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Authors: | WANG Hui YU Xiu-juan SUN De-zhi |
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Affiliation: | 1. School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China 2. School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China;Dept. of Environmental Science and Engineering, Heilongjiang University, Harbin 150086, China |
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Abstract: | A method of detection hydroxyl radical (·OH) produced by electrochemical oxidation in organic wastewater treatment was developed. Benzoic acid with weak fluorescence may reacted with hydroxyl radical to produce 3-hydroxybenzonic acid with intense fluorescence, whose characteristic fluorescence excitation and e-mission wavelength were at 305 nm and 410 nm. The 3-hydroxybenzonic acid was separated from electrochemi-cal oxidation system by HPLC. Two major hydroxylated products were quantified corresponding to 3-hydroxyben-zonic, 4-hydroxybenzonic acid. Therefore the quantity of hydroxyl radical in the reactive system should be pri-marily calculated. The optimal experimental program was obtained by studying the determination conditions, which were benzoic acid of 1.0 mmol/L, electrolysis time of 60 min, current density of 39 mA/cm2, supporting electrolyte (Na2SO4) of 0.02 mol/L, and the low rate of sparged-air of 25 mL/s. The results show that this method is stable, simple and rapid and can be used as a convenient method for the determination of hydroxyl radical. |
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Keywords: | hydroxyl radical electrochemical oxidation organic wastewater fluorescence spectrophotometry |
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