Study on the mechanism of degradation of acetaminophen by persulfate activated by plasma

Journal Information

J. Hefei Univ. Tech. (Nat. Sci.), Mar.2024, Vol.47 No.3: 392-397

DOI: 10.3969/j.issn.1003-5060.2024.03.017

Authors

YE Chaobing $ ^{1} $, XU Zimu $ ^{1} $, HU Shuheng $ ^{1} $, LAN Yan $ ^{2} $, CHENG Cheng $ ^{2} $

(1. School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, China; 2. Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China)

Abstract and Keywords

Abstract: Persulfate(PS) can be activated to produce strong oxidizing sulfate radical $ \left(\mathrm{SO}_{4}^{-}\cdot\right) $, the dielectric barrier discharge(DBD) plasma activated PS was used to degrade acetaminophen(AP) in water. The effects of initial concentration of AP, working gas flow rate and dosage of PS on the degradation effect were studied, and the possible degradation products and degradation paths were analyzed and speculated by mass spectrometry. The experimental results show that plasma/PS can effectively remove AP from water, and the removal rate of AP decreases with the increase of its initial concentration. The gas flow rate has a great influence on the degradation effect, and increasing the flow rate appropriately can promote the degradation of AP. When the flow rate exceeds 50 L/h, the promoting effect is gradually weakened, and the addition of PS can accelerate the degradation of AP. When the dosage of PS is 0.75 g/L, the treatment effect is the best. In the process of experimental treatment of wastewater, AP will be decomposed into small molecules, $ CO_{2} $ and $ H_{2}O $, and the mineralization rate after adding PS is 2.1 times that of plasma treatment alone.

Keywords: dielectric barrier discharge (DBD); acetaminophen (AP); persulfate (PS); degradation; non-thermal plasma

作者信息

叶朝兵 $ ^{1} $，许子牧 $ ^{1} $，胡淑恒 $ ^{1} $，兰彦 $ ^{2} $，程诚 $ ^{2} $

(1. 合肥工业大学资源与环境工程学院，安徽合肥 230009；2. 中国科学院等离子体物理研究所，安徽合肥 230031)

摘要和关键词

摘要: 过硫酸盐(persulfate, PS)可被活化产生具有强氧化性的硫酸根自由基 $ \left(\mathrm{SO}_{4}^{\bullet-}\right) $，利用介质阻挡放电(dielectric barrier discharge, DBD)等离子体活化PS降解水中对乙酰氨基酚(acetaminophen, AP)，研究AP初始质量浓度、工作气体流量和PS投加量对降解效果的影响，利用高效液相色谱-质谱联用仪对可能的降解产物和降解路径进行分析和推测。实验结果表明，等离子体/PS能有效去除水中AP，AP的去除率随着初始质量浓度的增加而降低，气体流量对降解效果影响较大，适当增加流量可促进AP的降解，当流量超过50 L/h后，促进效果逐渐减弱，PS的加入能加速AP的降解，当PS投加量为0.75 g/L时，处理效果最佳。实验处理废水过程中，AP会被分解为小分子物质、 $ CO_{2} $和 $ H_{2}O $，在添加PS后，矿化率是单独等离子体处理的2.1倍。

关键词: 介质阻挡放电(DBD)；对乙酰氨基酚(AP)；过硫酸盐(PS)；降解；低温等离子体

Funding

国家自然科学基金资助项目（51777206；51807046；51877208）；安徽省医学物理与技术重点实验室基金资助项目（LMPT2017Y7BP0U1581）和合肥工业大学博士点专项研究基金资助项目（JZ2017HGBZ0944）

合肥工业大学学报(自然科学版)

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