化工学报 ›› 2023, Vol. 74 ›› Issue (3): 1322-1331.DOI: 10.11949/0438-1157.20221522

• 能源和环境工程 • 上一篇    下一篇

UV/PMS、UV/PDS、UV/SPC工艺降解尼泊金甲酯

杨庆云1,2,3(), 李青松1,4(), 陈泽铭1, 邓靖3, 李玉瑛5(), 杨帆3, 陈国元1, 李国新1   

  1. 1.厦门理工学院水资源环境研究所,福建 厦门 361024
    2.宁波市水务环境集团有限公司,浙江 宁波 315046
    3.浙江工业大学土木工程学院,浙江 杭州 310014
    4.厦门市水资源利用与保护重点实验室,福建 厦门 361024
    5.五邑大学生物科技与大健康学院,广东 江门 529000
  • 收稿日期:2022-11-22 修回日期:2023-01-16 出版日期:2023-03-05 发布日期:2023-04-19
  • 通讯作者: 李青松,李玉瑛
  • 作者简介:杨庆云(1997—),男,硕士研究生,251857181@qq.com
  • 基金资助:
    国家自然科学基金项目(51878582);福建省科技计划引导性资助项目(2021Y0041);福建省自然科学基金项目(2020J01256);福建省高校新世纪优秀人才支持计划项目(JA14227)

Degradation of methylparaben by UV/PMS, UV/PDS and UV/SPC process

Qingyun YANG1,2,3(), Qingsong LI1,4(), Zeming CHEN1, Jing DENG3, Yuying LI5(), Fan YANG3, Guoyuan CHEN1, Guoxin LI1   

  1. 1.Water Resource and Environment Institute, Xiamen University of Technology, Xiamen 361024, Fujian, China
    2.Ningbo Water Environment Group Co. , Ltd. , Ningbo 315046, Zhejiang, China
    3.College of Civil Engineering, Zhejiang University of Technology, Hangzhou 310014, Zhejiang, China
    4.Key Laboratory of Water Resources Utilization and Protection of Xiamen City, Xiamen 361024, Fujian, China
    5.School of Biotechnology and Health, Wuyi University, Jiangmen 529000, Guangdong, China
  • Received:2022-11-22 Revised:2023-01-16 Online:2023-03-05 Published:2023-04-19
  • Contact: Qingsong LI, Yuying LI

摘要:

采用UV/过一硫酸盐(PMS)、UV/过二硫酸盐(PDS)和UV/过碳酸盐(SPC)三种工艺降解尼泊金甲酯(MeP),通过电子顺磁共振技术鉴定了三种工艺中存在的自由基,考察了氧化剂投加量、pH、阴离子、NH4+和HA对MeP去除的影响,通过竞争动力学的方法测定了MeP与SO4-·的二级反应速率常数及不同自由基对MeP去除的贡献,评估了不同氧化剂投加量下工艺的经济性,研究了不同工艺中有机物的矿化率和消毒副产物(DBPs)的生成。结果表明,三种氧化剂与UV联用都具有较好的协同效果,UV/PMS、UV/PDS和UV/SPC工艺降解MeP的拟一级动力学常数(kobs)分别为0.1615、0.3868和0.0798 min-1SO4-·与MeP的二级反应速率常数为1.37×109 L·mol-1·s-1。三种工艺中kobs都随氧化剂投加量的增加而增大,且UV/PDS工艺具有较好的经济效益。UV/PMS和UV/PDS工艺中kobs值随着pH的升高略微增加,而UV/SPC工艺中kobs则呈先上升后下降的趋势。三种工艺中NO3-HCO3-对MeP的去除均有不同程度的促进作用,而NH4+和HA则不同程度上抑制MeP的降解。Cl-在UV/PDS工艺中对MeP的去除有抑制作用,而在UV/PMS和UV/SPC工艺中呈现双重作用。UV/PDS工艺对MeP的矿化率最高,但也生成了更多的消毒副产物。

关键词: 紫外, 高级氧化, 自由基, 动力学, 消毒副产物

Abstract:

The UV/PMS, UV/PDS和UV/SPC processes were employed to degrade MeP in aqueous solution. Different free radicals during the three processes were identified by electron paramagnetic resonance. The effects of different oxidant dosages, pH, anions, NH4+ and HA on MeP removal were investigated. The second-order rate constants of SO4-· with MeP and contributions of different free radicals on MeP removal were determined by competitive kinetics, and the economics of different oxidant dosages were evaluated. The mineralization rate, DBPs formation and the alteration of acute toxicity during the degradation of MeP were investigated. The results showed that the three oxidants had good synergistic performances with UV, the pseudo-first-order kinetic rate constants of UV/PMS, UV/PDS and UV/SPC processes under experimental conditions were 0.1615, 0.3868 and 0.0798 min-1, respectively. The second-order rate constants of SO4-· with MeP were determined to be 1.37×109 L·mol-1·s-1. The kobs of MeP during the three processes increased with the increasing of oxidant dosage and the economic benefit of UV/PDS was superior to the other two processes. The kobs of UV/PMS and UV/PDS for MeP increased slightly with the increasing of pH, while the kobs of UV/SPC for MeP had a tendency of increasing first and then decreasing. Among the three processes, NO3- and HCO3- promoted the kobs of UV/PMS, UV/PDS and UV/SPC for MeP in varying degrees, while NH4+ and HA did the opposite. Cl- had an inhibiting effect on UV/PDS process, but it had a dual effect on UV/PMS and UV/SPC processes. UV/PDS manifested the highest mineralization rate of MeP among the three processes, but also generated more disinfection by-products.

Key words: UV, advanced oxidation, free radicals, kinetics, disinfection by-products

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