Abstract
Nicosulfuron, a kind of sulfonylurea herbicide, because of its high activity and low dosage, has been widely used in corn planting weeding. Electrochemical method was chosen to treat its simulated waste water and the influence factors such as current intensity, plate spacing and electrolyte pH on electrolysis effect were investigated. A double-coated titanium dioxide titanium plate was chosen as the anode accompanied with a single-coated titanium plate as the cathode. The results showed that the removal efficiency of nicosulfuron was the highest when the electrolyte pH=3, the plate spacing is 1.5cm and the current intensity is 0.8A. Under the optimal condition, the removal rate of nicosulfuron reached 86.6% after 7 hours electrolysis. Thus, electrochemical technology might provide a significant method to remove the synthetic organic compounds.
Highlights
Nicosulfuron has been widely used in corn planting weeding because of its high activity and low dosage
In all the subsequent electrolysis experiments, the reaction time was within 9 hours, the degradation of nicosulfuron due to stirring process could considered to be negligible
The current intensity directly is a key experimental parameter that affects the electrochemical oxidation process as it regulates the capability of hydroxyl radical generation on the electrode, which gonverns the degradation efficiency of organic matter in aqueous solution[5]
Summary
Nicosulfuron has been widely used in corn planting weeding because of its high activity and low dosage. Sabadie indicated that hydrolysis of nicosulfuron principally involves the breakdown of the urea part of the molecule at 30°C as pH ranging from 4 to 11. Its rate constants decreased from 0.50 d-1 to 0.002 d-1 as pH increased from 4 to 8, remained stable under alkaline conditions[1]. Chen adopted advanced oxidation technology to increase the biodegradability of nicosulfuron, and activated sludge process was used to improve the quality of effluent. The optimal removal rate of 83.2% was obtained through the optimization of the reaction process [2]. The toxic and harmful substances in the wastewater can not be completely removed only by biological treatment
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