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

doi:10.11949/0438-1157.20220060

CIESC Journal ›› 2022, Vol. 73 ›› Issue (5): 2233-2241.DOI: 10.11949/0438-1157.20220060

• Energy and environmental engineering • Previous Articles Next Articles

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

Xiyu XIAO^1,²(),Qingsong LI^2,⁴(),Junwen WU^1,³(),Guoxin LI²,Guoyuan CHEN²

^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:2022-05-24 Published:2022-05-05
Contact: Qingsong LI,Junwen WU

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.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

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)

Abstract

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 k_VUV/UV/Cl and k_UV/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 R_VUV/UV/Cl and R_UV/Cl showed an initial increase and then decrease with the increase of NaClO concentration and pH. The maximum R_VUV/UV/Cl and R_UV/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

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k_VUV/UV/Cl和k_UV/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(R_VUV/UV/Cl、R_UV/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，R_VUV/UV/Cl和R_UV/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

CLC Number:

X 703

Xiyu XIAO, Qingsong LI, Junwen WU, Guoxin LI, Guoyuan CHEN. Synergistic effect of thymol degradation by VUV/UV/NaClO technique and its major contributor of active species[J]. CIESC Journal, 2022, 73(5): 2233-2241.

肖习羽, 李青松, 吴俊文, 李国新, 陈国元. VUV/UV/NaClO工艺降解百里香酚协同效应及活性物质贡献[J]. 化工学报, 2022, 73(5): 2233-2241.

Figures/Tables 8

Fig.1 Degradation of Tml in different processes

Fig.2 Effect of NaClO concentration on the k (a) and R (b) during the Tml degradation by VUV/UV/NaClO and UV/NaClO

Fig.3 Effect of pH on the k and removal rate during the Tml degradation by four processes

Fig.4 Effect of pH on the k (a) and R (b) during the Tml degradation by VUV/UV/NaClO and UV/NaClO

Fig.5 Degradation of NB and Tml in different processes

Fig.6 Degradation of BA by different processes

Fig.7 Kinetics of Tml degradation in VUV/UV/NaClO, UV/NaClO and NaClO

Fig.8 Contribution of different species to Tml degradation in VUV/UV/NaClO and UV/NaClO processes

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

VUV/UV/NaClO工艺降解百里香酚协同效应及活性物质贡献

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