外加电流阴极保护强化ACF激活PDS降解水中卡马西平

Degradation of carbamazepine in aqueous solution by electrically protected and enhanced activated carbon fibers activating peroxodisulfate

摘要:

卡马西平是一种典型的持久性的有机药物污染物,采用一种新的外加电流阴极保护强化活性炭纤维（ACF）激活过硫酸盐（PDS）的高级氧化方法,实现对水中卡马西平的高效降解.考察该体系对比活性炭纤维激发过硫酸盐体系、阴极保护活性炭纤维电解体系、过硫酸盐体系、活性炭纤维吸附体系、电解体系等不同工艺对卡马西平的降解率,探究过硫酸盐初始浓度、电压、初始pH等因素对体系的影响,并通过活性炭纤维性质测定和自由基捕获探究其降解机制.结果显示,外加电流阴极保护增强活性炭纤维（ACF）激活过硫酸盐（PDS）体系对水中卡马西平的氧化降解率远高于其他5种处理工艺.在外加电流阴极保护强化活性炭纤维（ACF）激活过硫酸盐（PDS）体系中,过高的过硫酸盐浓度反而不利于卡马西平的降解,在一定条件下存在一个适宜的过硫酸盐浓度范围；电压的提高和初始pH为酸性（pH=3）更有利于对卡马西平的氧化降解.此外,该体系中活性炭纤维受到阴极电场保护,使用寿命大大延长.硫酸根自由基在体系去除卡马西平过程中起主导作用.

Abstract:

A novel oxidation way of electrically protected and enhanced activated carbon fibers (ACF) activating peroxodisulfate (PDS) was adopted in this work for the degradation of aqueous Carbamazepine, a sort of typical persistent medical pollutant. The removal rate by PDS system, ACF adsorption system, ACF activating PDS system, electrolysis system, protected ACF electrolysis system, and electrically protected and enhanced ACF activating PDS system was studied. The influences of PDS initial concentration, voltage, and initial pH value on the degradation of carbamazepine were also researched. Besides, characteristics detection of activated carbon fibers and radical quenching were conducted to reveal the oxidation mechanism in electrically protected and enhanced ACF activating PDS system. The results showed that the removal rate of carbamazepine in electrically protected and enhanced ACF activating PDS system was much higher than that in other processes. The excessive high initial PDS concentration could not promote the removal rate of carbamazepine. The removal rate of carbamazepine increased with the increase of voltage and the decrease of initial pH value. Activated carbon fibers could be protected from oxidation damaging with free electron implantation in cathode in electrically protected and enhanced ACF activating PDS process, which greatly prolonged its service life and significantly improved the utilization rate of PDS.