Unveiling the crucial role of iron mineral phase transformation in antimony(V) elimination from natural water

Eco-Environment & Health Pub Date : 2023-09-01 DOI:10.1016/j.eehl.2023.07.006

Xiaoyun Liu , Yunyan Wang , Hongrui Xiang , Jiahui Wu , Xu Yan , Wenchao Zhang , Zhang Lin , Liyuan Chai

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引用次数: 4

Abstract

Antimony (Sb) in natural water has long-term effects on both the ecological environment and human health. Iron mineral phase transformation (IMPT) is a prominent process for removing Sb(V) from natural water. However, the importance of IMPT in eliminating Sb remains uncertain. This study examined the various Sb–Fe binding mechanisms found in different IMPT pathways in natural water, shedding light on the underlying mechanisms. The study revealed that the presence of goethite (Goe), hematite (Hem), and magnetite (Mag) significantly affected the concentration of Sb(V) in natural water. Elevated pH levels facilitated higher Fe content in iron solids but impeded the process of removing Sb(V). To further our understanding, polluted natural water samples were collected from various locations surrounding Sb smelter sites. Results confirmed that converting ferrihydrite (Fhy) to Goe significantly reduced Sb levels (<5 μg/L) in natural water. The emergence of secondary iron phases resulted in greater electrostatic attraction and stabilized surface complexes, which was the most likely cause of the decline of Sb concentration in natural water. The comprehensive findings offer new insights into the factors governing IMPT as well as the Sb(V) behavior control.

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揭示了铁矿物相变在天然水除锑过程中的关键作用

天然水体中的锑对生态环境和人类健康有着长期的影响。铁矿物相变（IMPT）是从天然水中去除Sb（V）的一个突出过程。然而，IMPT在消除Sb方面的重要性仍不确定。这项研究考察了在天然水中不同IMPT途径中发现的各种Sb–Fe结合机制，揭示了潜在的机制。研究表明，针铁矿（Goe）、赤铁矿（Hem）和磁铁矿（Mag）的存在显著影响了天然水中Sb（V）的浓度。升高的pH水平促进了铁固体中较高的Fe含量，但阻碍了去除Sb（V）的过程。为了进一步了解，从锑冶炼厂周围的不同地点采集了受污染的天然水样。结果证实，将水铁矿（Fhy）转化为Goe显著降低了天然水中的Sb水平（<；5μg/L）。次生铁相的出现导致了更大的静电引力和稳定的表面络合物，这是天然水中Sb浓度下降的最可能原因。这些综合发现为IMPT的控制因素以及Sb（V）行为控制提供了新的见解。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Eco-Environment & Health 环境科学与生态学-生态、环境与健康

CiteScore

11.00

自引率

0.00%

发文量

审稿时长

22 days

期刊介绍： Eco-Environment & Health (EEH) is an international and multidisciplinary peer-reviewed journal designed for publications on the frontiers of the ecology, environment and health as well as their related disciplines. EEH focuses on the concept of “One Health” to promote green and sustainable development, dealing with the interactions among ecology, environment and health, and the underlying mechanisms and interventions. Our mission is to be one of the most important flagship journals in the field of environmental health. Scopes EEH covers a variety of research areas, including but not limited to ecology and biodiversity conservation, environmental behaviors and bioprocesses of emerging contaminants, human exposure and health effects, and evaluation, management and regulation of environmental risks. The key topics of EEH include: 1) Ecology and Biodiversity Conservation Biodiversity Ecological restoration Ecological safety Protected area 2) Environmental and Biological Fate of Emerging Contaminants Environmental behaviors Environmental processes Environmental microbiology 3) Human Exposure and Health Effects Environmental toxicology Environmental epidemiology Environmental health risk Food safety 4) Evaluation, Management and Regulation of Environmental Risks Chemical safety Environmental policy Health policy Health economics Environmental remediation