摘要
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 electroehenaical oxidation system by HPLC. Two major hydroxylated products were quantified corresponding to 3-hydroxybenzonic, 4-hydroxybenzonic acid. Therefore the quantity of hydroxyl radical in the reactive system should be primarily 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/cm^2 , 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, sinaple and rapid and can be used as a convenient method for the determination of hydroxyl radical.
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 emission wavelength were at 305 nm and 410 nm. The 3-hydroxybenzonic acid was separated from electrochemical oxidation system by HPLC. Two major hydroxylated products were quantified corresponding to 3-hydroxybenzonic, 4-hydroxybenzonic acid. Therefore the quantity of hydroxyl radical in the reactive system should be primarily 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.
基金
Sponsored by the Natural Specialism Expense for Base Research (Grant No 2004CB41850)
the Scientific Research Foundation of Harbin Institute ofTechnology (Grant No01100677)
