当前位置: X-MOL 学术Environ. Sci.: Processes Impacts › 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.)
Enhanced tetrabromobisphenol A debromination by nanoscale zero valent iron particles sulfidated with S0 dissolved in ethanol
Environmental Science: Processes & Impacts ( IF 5.5 ) Pub Date : 2020-10-16 , DOI: 10.1039/d0em00375a
Heli Wang 1, 2, 3, 4, 5 , Yin Zhong 1, 2, 3, 4, 5 , Xifen Zhu 1, 2, 3, 4, 5 , Dan Li 1, 2, 3, 4, 5 , Yirong Deng 1, 2, 3, 4, 5 , Weilin Huang 6, 7, 8, 9 , Ping'an Peng 1, 2, 3, 4, 5
Affiliation  

Modification of nanoscale zero-valent iron (nZVI) with reducing sulfur compounds has proven to improve the reactivity of nZVI towards recalcitrant halogenated organic contaminants. In this study, we develop a novel method for the preparation of sulfidated nZVI (S-nZVI) with S0 (a low cost and available reducing sulfur agent) dissolved in ethanol under mild conditions and apply it for the transformation of tetrabromobisphenol A (TBBPA), a potential persistent organic pollutant. Surface analysis shows that S0 dissolved in ethanol has been successfully doped into nZVI via a reaction with Fe0 to form a relatively homogeneous layer of FeS/FeS2 on the nZVI surface. The H2 production test and the electrochemical analysis show that the FeS/FeS2 layer not only slows the H2 evolution reaction but also enhances the electron transfer. Debromination kinetics indicate that the resulting S-nZVI with a S/Fe ratio of 0.015–0.05 possesses higher debromination activity for TBBPA and its debromination products (i.e., tri-BBPA, di-BBPA, mono-BBPA and BPA) in comparison with nZVI. Among them, S-nZVI at a S/Fe of 0.025 (S-nZVIS-0.025) has the greatest debromination rate constant (kobs) of 1.19 ± 0.071 h−1 for TBBPA. It debrominates TBBPA at a faster rate than other conventional S-nZVI made from Na2S and Na2S2O4 and has been successfully applied in the treatment of TBBPA-spiked environmental water samples (including river water, groundwater, and tap water). The results suggest that the modification of nZVI with S0 dissolved in ethanol is a simple, safe, inexpensive, and effective sulfidation technique, which can be applied for the large-scale production of S-nZVI for treating contaminated water.

中文翻译:

纳米零价铁粒子被溶解在乙醇中的硫化硫硫化后增强的四溴双酚A脱溴

业已证明,用还原性硫化合物修饰纳米级零价铁(nZVI)可以提高nZVI对难降解的卤代有机污染物的反应性。在这项研究中,我们开发了一种在温和的条件下以S 0(低成本和可用的还原性硫磺剂)溶解在乙醇中的硫化nZVI(S-nZVI)的制备方法,并将其用于四溴双酚A(TBBPA)的转化),一种潜在的持久性有机污染物。表面分析表明,溶解在乙醇中的S 0通过与Fe 0反应成功地掺杂到nZVI中从而在nZVI表面形成了相对均匀的FeS / FeS 2层。H 2生产测试和电化学分析表明,FeS / FeS 2层不仅减缓了H 2析出反应,而且增强了电子转移。脱溴动力学表明,与nZVI相比,生成的S / Fe比为0.015-0.05的S-nZVI对TBBPA及其脱溴产物(tri-BBPA,di-BBPA,mono-BBPA和BPA)具有更高的脱溴活性。。其中,S / Fe为0.025的S-nZVI(S-nZVI S-0.025)对于TBBPA具有最大的脱溴速度常数(k obs)为1.19±0.071 h -1。与其他由Na 2 S和Na 2制成的常规S-nZVI相比,它能更快地使TBBPA脱溴。S 2 O 4并已成功用于处理TBBPA加标的环境水样品(包括河水,地下水和自来水)。结果表明,用溶于乙醇的S 0对nZVI进行改性是一种简单,安全,廉价,有效的硫化技术,可用于大规模生产S-nZVI来处理污水。
更新日期:2020-12-17
down
wechat
bug