化工学报 ›› 2022, Vol. 73 ›› Issue (5): 2233-2241.DOI: 10.11949/0438-1157.20220060

• 能源和环境工程 • 上一篇    下一篇

VUV/UV/NaClO工艺降解百里香酚协同效应及活性物质贡献

肖习羽1,2(),李青松2,4(),吴俊文1,3(),李国新2,陈国元2   

  1. 1.汕头大学海洋灾害预警与防护广东省重点实验室,广东 汕头 515063
    2.厦门理工学院水资源环境研究所,福建 厦门 361024
    3.南方海洋科学与工程广东省实验室(广州),广东 广州 511458
    4.厦门市水资源利用与保护重点实验室,福建 厦门 361024
  • 收稿日期:2022-01-12 修回日期:2022-03-26 出版日期:2022-05-05 发布日期:2022-05-24
  • 通讯作者: 李青松,吴俊文
  • 作者简介:肖习羽(1995—),女,硕士研究生,19xyxiao@stu.edu.cn
  • 基金资助:
    国家自然科学基金项目(51878582);广东省自然科学基金项目(2021A1515011886);南方海洋科学与工程广东省实验室(广州)重大专项团队项目(GML2019ZD0606);汕头大学科研启动基金项目(NTF18011);汕头市创新创业项目(201112176541391);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)

Synergistic effect of thymol degradation by VUV/UV/NaClO technique and its major contributor of active species

Xiyu XIAO1,2(),Qingsong LI2,4(),Junwen WU1,3(),Guoxin LI2,Guoyuan CHEN2   

  1. 1.Guangdong Provincial Key Laboratory of Marine Disaster Prediction and Prevention, Shantou University, Shantou 515063, Guangdong, China
    2.Water Resource and Environment Institute, Xiamen University of Technology, Xiamen 361024, Fujian, China
    3.Southern Marine Science and Engineering Guangdong Laboratory, Guangzhou 511458, Guangdong, China
    4.Key Laboratory of Water Resources Utilization and Protection of Xiamen, Xiamen 361024, Fujian, China
  • Received:2022-01-12 Revised:2022-03-26 Online:2022-05-05 Published:2022-05-24
  • Contact: Qingsong LI,Junwen WU

摘要:

采用VUV/UV/NaClO与UV/NaClO工艺降解百里香酚(Tml),以协同因子(R)为评价指标,探究了NaClO浓度和pH对Tml去除及协同效应的影响;以硝基苯(NB)和苯甲酸(BA)为探针化合物,确定了不同工艺中HO·和Cl·的稳态浓度及其与Tml的二级反应速率常数;并对比了两种工艺中不同物质对Tml降解的贡献。结果表明,VUV/UV/NaClO与UV/NaClO工艺降解Tml均符合拟一级反应动力学,其一级动力学常数kVUV/UV/ClkUV/Cl分别为0.0113 s-1和0.00479 s-1,且均与NaClO浓度呈正相关;VUV/UV/NaClO和UV/NaClO工艺对Tml的降解具有显著的协同效应,相应的协同因子(RVUV/UV/ClRUV/Cl)随NaClO的浓度的增加及溶液pH的增大均先增加再降低;当NaClO浓度为0.3 mg·L-1和pH=7时,RVUV/UV/ClRUV/Cl达到最大值,分别为1.9和2.1,对应的协同增效为90%和110%。VUV/UV/NaClO和UV/NaClO工艺中HO·的贡献率分别为42.7%和37.6%,Cl·的贡献率分别为42.4%和28.5%。两种工艺中HO·和Cl·均为主要贡献物质。

关键词: 百里香酚, VUV/UV/NaClO, 协同效应, 自由基, 贡献率

Abstract:

The VUV/UV/NaClO and UV/NaClO processes were used to degrade thymol (Tml), and the synergistic factor (R) was used as the evaluation index to explore the effects of NaClO concentration and pH on Tml removal and synergistic effect. Meanwhile, using nitrobenzene (NB) and benzoic acid (BA) as probe compounds, the concentrations of HO· and Cl· in steady state, their contributions to Tml degradation, and their secondary reaction rates with Tml in two technologies were determined. The results show that the degradation of Tml using VUV/UV/NaClO and UV/NaClO technologies is in accord with the pseudo-primary reaction kinetics, and the first-level kinetic constants of kVUV/UV/Cl and kUV/Cl are determined to be 0.0113 s-1 and 0.00479 s-1, respectively, which is positively correlated with NaClO concentration. VUV/UV/NaClO and UV/NaClO processes had significant synergistic effects on the degradation of Tml, and the corresponding synergistic factors RVUV/UV/Cl and RUV/Cl showed an initial increase and then decrease with the increase of NaClO concentration and pH. The maximum RVUV/UV/Cl and RUV/Cl were determined to be 1.9 and 2.1 when the NaClO concentration and pH are 0.3 mg·L-1 and 7, respectively, and the corresponding synergies were 90% and 110%. The contribution rates of HO· in the VUV/UV/NaClO and UV/NaClO processes were calculated to be 42.7% and 37.6%, respectively, while the contributions of Cl· were 42.4% and 28.5%, respectively. HO· and Cl· were the dominated contributors in the two processes.

Key words: thymol, VUV/UV/NaClO, synergistic effect, radical, contribution rate

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