强化电芬顿氧化苯扎氯铵效率及机理研究

Degradation Efficiency and Mechanism of Benzalkonium Chloride by the Electro-Fenton Process

采用铁丝为阳极和玻碳为阴极构成的电芬顿体系来降解含有苯扎氯铵的废水,考察了初始p H、外加电流、Fe2+投加量、不同电解质、曝气量对降解过程的影响。结果表明:在p H为3、电流为15 m A、Fe2+的浓度为1 mmol/L、电解质为Na2SO4、曝气量为0.15 m3/h的条件下,5 h后苯扎氯铵的降解率达到99%。通过对降解过程中的中间产物的测定,苯扎氯铵的降解途径主要是C—N和C—C键的断裂,最后逐步矿化为小分子。

Electro-Fenton technology with stainless steel anode and cathode of glassy carbon was introduced to remove benzalkonium chloride containing wastewater. The effects of initial p H, current, Fe2＋dosage, different electrolytes and aeration on the degradation process were investigated. The results showed that the maximum degradation rate of benzalkonium chloride can reach 99% after 5 h under the optimized conditions as the p H 3, current density 15 m A, dosage of Fe2＋1 mmol/L, Na2 SO4 as electrolyte, and the intensity of aeration 0.15 m3/h. Through the determination of intermediates in the degradation process,the degradation of benzalkonium chloride was the main fracture of C—N and C—C bonds, finally gradually mineralized into small molecules.