高校化学工程学报2024，Vol.38Issue(2)：328-340,13.DOI:10.3969/j.issn.1003-9015.2024.02.018
VUV/UV/NaClO及UV/NaClO去除百里香酚:降解机制及水质影响因素
Degradation of thymol by VUV/UV/NaClO and UV/NaClO processes:Degradation mechanism and water quality affecting factors
摘要
Abstract
VUV/UV/NaClO and UV/NaClO processes were employed to degrade thymol(Tml)in aqueous solution.Effects of pH,CO32-,NO3-and humic acid(HA)on Tml removal were comparatively studied.The degradation products were identified and a possible degradation pathway was proposed.Meanwhile,the alteration of acute toxicity during VUV/UV/NaClO process was investigated,and the most toxic by-products were identified by toxicity assessment and ECOSAR software simulation.The results show that the pseudo first-order kinetic constants(kobs)for Tml removal decreased firstly and then increased with increasing pH in both UV/NaClO and VUV/UV/NaClO processes,and the minimum values were 0.1836 and 0.5547 min-1 at pH=7,respectively.The presence of CO32-favors Tml degradation,while low concentration of NO3-demonstrates a slightly inhibiting effect but high concentration shows the opposite.HA has an inhibiting effect on the degradation of Tml.The impact of water quality on Tml degradation was more obvious during VUV/UV/NaClO process,in which kobs was about 1.05～3.57 times of that of the UV/NaClO process.Tml in the VUV/UV/NaClO process mainly showed radical substitution,addition and oxidative decomposition reactions,and chlorinated,quinone and aldehyde intermediates were generated.The acute toxicity of the VUV/UV/NaClO process treated solution had an increase-decrease-increase profile.The increase of acute toxicity in the later stage may be due to the generation of small-molecule organic compounds such as vinyl propionate and glutaraldehyde.关键词
VUV/UV/NaClO/UV/NaClO/百里香酚(Tml)/水质/自由基Key words
VUV/UV/NaClO/UV/NaClO/thymol/water quality/radical分类
资源环境引用本文复制引用
袁雨瑾,肖习羽,李青松,李玉瑛,吴俊文,戴惠林..VUV/UV/NaClO及UV/NaClO去除百里香酚:降解机制及水质影响因素[J].高校化学工程学报,2024,38(2):328-340,13.基金项目
国家自然科学基金(51878582,42076038) （51878582,42076038）
福建省科技计划引导性资助(2021Y0041). （2021Y0041）
