Abstract:

A dielectric barrier discharge plasma reactor was applied to the degradation of tetracycline hydrochloride in the aqueous solution. A series of parameters including input power, air-gap distance, initial concentration and air flow rate were investigated for their effects on the degradation efficiency. The results showed that the degradation efficiency was as high as 92% at the optimum degradation parameters:input power 1.3 W, air-gap distance 2.5 mm, air flow rate 150 ml·min^-1, tetracycline hydrochloride initial concentration 100 mg·L^-1 and treatment time 30 min. The kinetic studies indicated that the degradation of tetracycline hydrochloride followed the pseudo-second-order kinetics. Based on the intermediate products identified by LC-MS, a possible degradation pathway of tetracycline hydrochloride was proposed.

Key words: dielectric barrier discharge, wastewater, tetracycline hydrochloride, degradation, mechanism, oxidation

摘要：

采用介质阻挡放电等离子体反应器降解盐酸四环素（TC），研究了输入功率、放电间距、气体流量、初始浓度等参数对盐酸四环素降解效果的影响，结果表明当输入功率为1.3 W，放电间距为2.5 mm，气体流量为150 ml·min^-1，初始浓度为100 mg·L^-1时降解效果最好，放电处理30 min盐酸四环素的降解率达到92%。动力学研究表明盐酸四环素的降解过程符合拟二级动力学方程。检测了降解过程中生成的中间产物，提出了盐酸四环素的降解路径与机理。

关键词: 介质阻挡放电, 废水, 盐酸四环素, 降解, 机理, 氧化