| UV/NaClO和UV/过碳酸钠工艺降解水杨酸的对比 |
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| 引用本文： | 马晓雁,杨帆,李青松,杨庆云,陈国元,李国新.UV/NaClO和UV/过碳酸钠工艺降解水杨酸的对比[J].中国环境科学,2022,42(3):1182-1190. |
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| 作者姓名： | 马晓雁 杨帆 李青松 杨庆云 陈国元 李国新 |
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| 作者单位： | 1. 浙江工业大学土木工程学院, 浙江 杭州 310014;2. 厦门理工学院水资源环境研究所, 福建 厦门 361024;3. 厦门理工学院厦门市水资源利用与保护重点实验室, 福建 厦门 361024 |
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| 基金项目： | 国家自然科学基金资助项目(51878582,51978618)；;福建省科技计划引导性资助项目(2021Y0041)；;福建省自然科学基金资助项目(2020J01256)；;福建省高校新世纪优秀人才支持计划项目(JA14227)； |
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| 摘 要： | 采用UV/NaClO和UV/过碳酸钠（SPC）工艺降解水中水杨酸（SA），对比考察了氧化剂种类和投加量对SA去除的影响，采用淬灭法和电子顺磁共振波谱仪（EPR）鉴定识别了2种工艺中的自由基，通过竞争动力学的方法计算了SA与?OH、CO3?-的二级反应速率常数及反应体系中不同组分的贡献，从环境水样模拟、急性毒性和经济效益等角度比较了SA的去除效果.结果表明，UV/NaClO工艺和UV/SPC工艺降解SA的拟一级动力学常数分别为0.4378，0.3794min-1.UV/NaClO和UV/SPC体系中分别存在?OH、Cl?和O2?-、?OH及CO3?-等自由基.SA与?OH、CO3?-的二级反应速率常数分别为3.97x109，8x107L/（mol×s）.UV/NaClO工艺中活性氯自由基（RCS）（79.91%）对SA去除起主导作用；而UV/SPC工艺中O2?-（51.75%）与?OH（41.42%）起主导作用.环境水样中SA在UV/NaClO和UV/SPC工艺中的降解受到抑制，其反应速率分别平均降低了67%和74%.UV/SPC工艺反应溶液的抑制率（25%）较UV/NaClO工艺反应溶液（63%）低38%.SA降解率达到97.5%以上时UV/SPC工艺的成本37.1$/（m3×order）]是UV/NaClO工艺成本4.0$/（m3×order）]的9.3倍，UV/NaClO工艺较UV/SPC工艺具有较高的经济效益.
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| 关 键 词： | UV-AOPs 自由基鉴定 自由基贡献 急性毒性 经济效益 |
| 收稿时间： | 2021-08-18 |
Comparison of UV/NaClO and UV/Sodium percarbonate processes for degradation of salicylic acid |
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| MA Xiao-yan,YANG Fan,LI Qing-song,YANG Qing-yun,CHEN Guo-yuan,LI Guo-xin.Comparison of UV/NaClO and UV/Sodium percarbonate processes for degradation of salicylic acid[J].China Environmental Science,2022,42(3):1182-1190. |
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| Authors: | MA Xiao-yan YANG Fan LI Qing-song YANG Qing-yun CHEN Guo-yuan LI Guo-xin |
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| Institution: | 1. College of Civil Engineering, Zhejiang University of Technology, Hangzhou 310014, China;2. Water Resource and Environment Institute, Xiamen University of Technology, Xiamen 361024, China;3. Key Laboratory of Water Resources Utilization and Protection of Xiamen, Xiamen University of Technology, Xiamen 361024, China |
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| Abstract: | The degradation of salicylic acid (SA) in aqueous solution by UV/NaClO and UV/SPC processes was investigated. The effects of oxidizer types and dosage on SA removal were compared. The free radicals in the two processes were identified by quenching method and electron paramagnetic resonance(EPR) spectroscopy. The second-order rate constants of ?OH and CO3?- with SA and the contributions of different components in the reaction system were determined by competitive kinetics. The removal of SA was compared in terms of environmental water samples simulation, acute toxicity and economic benefit. The pseudo-first-order kinetic rate constants of UV/NaClO and UV/SPC processes were 0.4378 and 0.3794min-1, respectively. ?OH and Cl? were detected in UV/NaClO process, while O2?-, ?OH and CO3?- were detected in UV/SPC process. The second-order rate constants of ?OH and CO3?- with SA were calculated to be 3.97x109 and 8x107L/(mol×s), respectively. Reactive chlorine species (RCS) (79.91%) functioned a dominant role in the removal of SA in UV/NaClO process, while O2?-(51.75%) and ?OH (41.42%) functioned a dominant role in UV/SPC process. The degradation of SA in environmental water samples by UV/NaClO and UV/SPC processes was inhibited, and the removal rates were reduced by 67% and 74%, respectively. The inhibition rate of UV/SPC process (25%) was 38% lower than that of UV/NaClO process(63%). The cost of UV/SPC process37.1$/(m3×order)] was 9.3 times higher than that of UV/NaClO process4.0$/(m3×order)] when SA degradation rate was above 97.5%. UV/NaClO process had higher economic benefit than UV/SPC process. |
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| Keywords: | UV-AOPs radical identify contribution of free radicals acute toxicity economic benefit |
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