Selenate reduction by sulfidized zero-valent iron (S-ZVI)

硫化零价铁 (S-ZVI) 还原硒酸盐

• 批准号: 419963714
• 负责人: Professor Dr. Stefan Peiffer
• 金额: --
• 依托单位: Canadian Light Source
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2019
• 资助国家: 德国
• 起止时间: 2018-12-31 至 2021-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/419963714?language=en
• 关键词: Selenate; reduction; sulfidized; zero; valent

One the one hand, selenium is an essential nutrient, on the other hand it is highly toxic at elevated concentrations. The most soluble species in water are selenite (Se(IV)) and selenate (Se(VI)). Because of their solubility, both species can rapidly attain toxic levels in the aquatic food chain. In this proposal we will explore the potential of sulfide modified zero-valent iron (S-ZVI) to reduce Se(VI) to Se(0) and/or Se(-II). Sulfidation of ZVI has received growing attention in the last 3 to 4 years as a method to enhance selectivity and specificity of contaminant degradation by using ZVI as an abiotic reductant. To date, no study has been performed the effect on selenate removal. In the proposed research we will study along three work packages the following hypothesis: i) The S/Fe ratio of S-ZVI determines its reactivity towards Se(VI), ii) the presence of oxygen and Fe(II) affects the effectiveness of S-ZVI to reduce Se(VI), iii) Se(VI) reduction by S-ZVI is affected by pH due to electrostatic effects, and iv) application of S-ZVI particles in filter-bed systems is an effective method for removal of selenate from solution. The kinetics and mechanisms of the interaction between S-ZVI and selenate will be studied in batch experiments in combination with synchrotron based methods in collaboration with the Canadian Light Source. In addition we will perform filter-bed experiments packed with S-ZVI.

一方面，硒是一种必需的营养素，另一方面，它在高浓度下具有高度毒性。在水中最易溶解的物质是亚硒酸盐（Se（IV））和硒酸盐（Se（VI））。由于它们的溶解性，这两个物种在水生食物链中可以迅速达到有毒水平。在本提案中，我们将探索硫化物改性零价铁（S-ZVI）将Se（VI）还原为Se（0）和/或Se（-II）的潜力。在过去的3到4年中，硫化的ZVI作为一种非生物还原剂，作为一种提高污染物降解的选择性和特异性的方法受到越来越多的关注。到目前为止，还没有研究对硒酸盐去除的影响。在拟议的研究中，我们将研究沿着三个工作包，以下假设：i）S-ZVI的S/Fe比决定其对Se（VI）的反应性，ii）氧和Fe（II）的存在影响S-ZVI还原Se（VI）的有效性，iii）由于静电效应，S-ZVI的Se（VI）还原受pH影响，S-ZVI粒子在滤床系统中的应用是从溶液中去除硒酸盐的有效方法。S-ZVI和硒酸盐之间相互作用的动力学和机制将在批量实验中结合同步加速器的方法与加拿大光源合作进行研究。此外，我们将进行过滤床实验与S-ZVI包装。