铁对水中亚砷酸盐的氧化吸附：机理观点,Environmental Science: Water Research & Technology

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铁对水中亚砷酸盐的氧化吸附：机理观点
Environmental Science: Water Research & Technology ( IF 3.5 ) Pub Date : 2022-09-12 , DOI: 10.1039/d2ew00522k
Puthiya Veetil Nidheesh ₁ , Govindaraj Divyapriya ₂ , Elizabeth B. Cerkez ₃ , Ashitha Gopinath ₁ , Tuhin Banerji _{4,

5} , Daniel R. Strongin ₃

Affiliation

在居住在地球上的所有社区中，没有饮用水的生活是毫无疑问的。过去几十年的报告显示，地下水中砷的污染水平令人震惊，来自自然和人为来源，完全去除仍然是一个争论的话题。亚砷酸盐 (As( III )) 被认为是一种更有效的砷形式，因为它主要作为中性物质存在于天然水中（pH 值为 6-9），这使得去除过程具有挑战性。然而，在相同的 pH 条件下，氧化形式的砷酸盐 (As( V )) 作为带负电荷的物质存在，可以通过吸附、沉淀或凝结过程。砷的这一基本特性需要通过各种氧化技术将亚砷酸盐转化为砷酸盐，以提高从受污染水中的去除率。为此，铁和与铁相关的化合物由于其天然丰富性和与砷的反应性而作为氧化剂在水处理行业中获得了极大的关注。本综述致力于讨论亚砷酸盐氧化吸附过程中与各种铁和铁基化合物有关的机制。此外，该评论还深入了解了可以利用铁和铁基矿物质消除水中砷的不同技术。

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Oxidative sorption of arsenite from water by iron: a mechanistic perspective

Sustenance of life without potable water is unquestionable among all communities inhabiting the earth. Reports of the past few decades showcase the alarming contamination levels of arsenic in groundwater arising from both natural and anthropogenic sources, where the complete removal is still a topic of debate. Arsenite (As(III)) is considered a more potent form of arsenic as it predominantly exists as a neutral species in natural water (pH of 6–9) making the removal process challenging. However, under the same pH conditions, the oxidized form, arsenate (As(V)), exists as a negatively charged species, allowing removal via adsorption, precipitation, or coagulation processes. This fundamental property of arsenic necessitates the conversion of arsenite to arsenate by various oxidation techniques to enhance removal from contaminated waters. To this end, iron and iron-related compounds have gained immense attention as oxidizing agents in the water treatment industry due to their natural abundance and reactivity with arsenic. This review is devoted to the discussion of the mechanisms pertaining to various iron and iron-based compounds during the oxidative adsorption of arsenite. Moreover, the review provides insight into the different technologies that can utilize iron and iron-based minerals for the elimination of arsenic from water.

更新日期：2022-09-12

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