生物炭负载的零价铁催化过硫酸盐氧化去除at去津：反应性，自由基产生和转化途径。,Environmental Research

当前位置： X-MOL 学术 › Environ. Res. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

生物炭负载的零价铁催化过硫酸盐氧化去除at去津：反应性，自由基产生和转化途径。
Environmental Research ( IF 7.7 ) Pub Date : 2020-02-19 , DOI: 10.1016/j.envres.2020.109260
Zhao Jiang ₁ , Jiaojiao Li ₁ , Duo Jiang ₁ , Yan Gao ₁ , Yukun Chen ₁ , Wei Wang ₁ , Bo Cao ₁ , Yue Tao ₁ , Lei Wang ₁ , Ying Zhang ₁

Affiliation

阿特拉津是一种广泛使用的除草剂，其存在对农业和人类居住环境构成潜在威胁。这项工作研究了零价铁和生物炭复合物（ZVI / BC）活化过硫酸盐（PS）降解阿特拉津的性能和机理。结果表明，30去津在30min内的去除率达到73.47％。此外，通过响应面法获得了最佳参数（175 mg / L ZVI / BC，2 mM PS和初始pH为3）。同时，在最佳条件下获得了较高的at去津去除率（83.77％）。自由基猝灭研究和电子自旋共振表明，PS活化过程中产生的活性物质以及SO4·-和HO·是阿特拉津降解的主要活性物质。根据铁腐蚀产物和XPS分析，提出了ZVI / BC-PS体系的反应机理，即负载在复合材料上的ZVI进一步活化了PS，生成了SO4·-和HO·，它们伴随着铁的价态变化最终导致at去津的降解。另外，通过GC-MS和LC-MS的结果，r去津在ZVI / BC-PS系统中的降解途径包括脱烷基，烷基氧化和脱氯-羟基化。这些发现表明，ZVI / BC活化的过硫酸盐可能是降解at去津的有效技术。通过GC-MS和LC-MS分析烷基氧化和脱氯-羟基化。这些发现表明，ZVI / BC活化的过硫酸盐可能是降解at去津的有效技术。通过GC-MS和LC-MS分析烷基氧化和脱氯-羟基化。这些发现表明，ZVI / BC活化的过硫酸盐可能是降解at去津的有效技术。

"点击查看英文标题和摘要"

Removal of atrazine by biochar-supported zero-valent iron catalyzed persulfate oxidation: Reactivity, radical production and transformation pathway.

Atrazine is a widely used herbicide whose presence poses a potential threat to agriculture and human living environment. This work studied the degradation performances and mechanisms of zero-valent iron and biochar composite (ZVI/BC) activated persulfate (PS) for atrazine. The results showed that the removal percentage of atrazine reached 73.47% within 30 min. Furthermore, the optimal parameters (175 mg/L ZVI/BC, 2 mM PS and initial pH of 3) were obtained through response surface methodology. Meanwhile, the high atrazine removal percentage (83.77%) was obtained under the optimal conditions. Radical quenching studies and electron spin resonance revealed that active substances produced during PS activation, as well as that SO4·- and HO· were dominant active species for the atrazine degradation. According to iron corrosion products and XPS analysis, the reaction mechanism of ZVI/BC-PS system was proposed as that ZVI loaded on the composites further activated PS to produce SO4·- and HO· which accompany with the valent changing of iron and finally causing degradation of atrazine. In addition, the degradation pathways of atrazine in ZVI/BC-PS system included dealkylation, alkyl oxidation and dechlorination-hydroxylation by the results of GC-MS and LC-MS. These findings demonstrated that ZVI/BC activated persulfate may be an efficient technique for the degradation of atrazine.

更新日期：2020-02-20

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南

全部期刊列表>>