| 紫外活化过硫酸盐降解水中三氯蔗糖动力学和机制 |
| 摘要点击 1943 全文点击 694 投稿时间：2020-01-06 修订日期：2020-04-06 |
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| 中文关键词 三氯蔗糖(SUC) 人工甜味剂(Ass) 紫外/活化过硫酸盐 动力学 降解机制 |
| 英文关键词 sucralose (SUC) artificial sweeteners(Ass) UV/persulfate kinetics degradation mechanism |
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| 中文摘要 |
| 以新兴污染物人工甜味剂三氯蔗糖（SUC）为对象，研究紫外活化过硫酸盐（UV/PS）对其的降解效果.考察UV光强、PS投加量、溶液初始pH值和阴离子浓度等因素的影响，解析UV/PS降解SUC过程中的降解产物并评估其生态毒性.结果表明，对比单一UV和单一PS，UV/PS降解SUC效果更为明显，SUC降解反应速率常数随光强、PS投加量增加而增大，中性条件更有利于SUC降解，背景离子NO3-和HCO3-对UV/PS降解SUC有一定的抑制作用，而Cl-和SO42-促进降解过程.基于高分辨质谱HRMS和GC-MS解析出16种中间产物，降解过程主要涉及羟基化、氧化和醚裂解等反应.发光细菌毒性实验和ECOSAR预测结果表明，UV/PS降解SUC过程中会产生毒性高于母物质的中间产物，对生态环境存在潜在威胁. |
| 英文摘要 |
| The degradation of emerging pollutant artificial sweetener sucralose (SUC) using UV/persulfate (UV/PS). The effects of several process parameters, including UV light intensity, PS dosage, pH, and anion concentration, were also investigated. The degradation products and their toxicity during the UV/PS process were further analyzed and evaluated. It is reported that, compared with single UV or PS, the degradation of SUC by UV/PS was more obvious. The degradation rate constants increased with an increase in the light intensity and PS dosage. The SUC degradation could be improved under neutral conditions. The background ions NO3- and HCO3- could inhibit the degradation process, while Cl- and SO42- ions could accelerate the process. Sixteen intermediate products were identified using high-resolution mass spectrometry (HRMS) and GC-MS. Hydroxylation, oxidation, ether cracking, and other reactions were involved. A degradation path was further proposed. Moreover, luminescent bacteria toxicity test and ECOSAR prediction showed that the intermediates with higher toxicity could be produced during UV/PS, which could pose a potential threat to the ecological environment. |
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