Arsenic(III) sequestration by terrestrial-derived soil protein: Roles of redox-active moieties and Fe(III),Journal of Hazardous Materials

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Arsenic(III) sequestration by terrestrial-derived soil protein: Roles of redox-active moieties and Fe(III)
Journal of Hazardous Materials ( IF 12.2 ) Pub Date : 2024-09-06 , DOI: 10.1016/j.jhazmat.2024.135775
Lujian Lin ₁ , Bo Yuan ₁ , Shengjie Wu ₂ , Manlin Su ₁ , Hanyi Li ₁ , Xiaoting Zhang ₁ , Guanglong Zhang ₁ , Hualong Hong ₁ , Haoliang Lu ₁ , Jingchun Liu ₁ , Chongling Yan ₃

Affiliation

Glomalin-related soil protein (GRSP) has demonstrated significant potential for water purification and remediation of heavy metals in soils; however, its redox reactivity for As(III) sequestration and the corresponding redox-active component are still poorly understood. This study investigated the photochemical properties of GRSP and its mechanism of oxidation/adsorption of As(III). The results showed that UV irradiation triggered electron transfer and the production of reactive oxygen species (ROS) in GRSP, thereby facilitating As(III) oxidation with promotion rates ranging from 43.34 % to 111.1 %. The oxidation of As(III) occurred both on the GRSP photoforming holes and in the ROS reaction from the oxygen reduction products of the photoforming electrons. OH• and H2O2 played an important role in the oxidation of As(III) by GRSP, especially under alkaline conditions. Moreover, the presence of Fe(III) in GRSP facilitated the formation of OH• and its the oxidation capacity towards As(III). The binding of As(III) to the −COOH, −OH, and −FeO groups on the GRSP surface occurred through surface complexation. Overall, these findings provided new insights into the roles of the redox-active moieties and Fe(III) on GRSP in the promoted oxidation of As(III), which would help to deepen our understanding of the migration and transformation of As(III) in soils.

中文翻译：

陆地来源的土壤蛋白的砷（III）封存：氧化还原活性部分和 Fe（III）的作用

Glomalin 相关土壤蛋白（GRSP）在水净化和土壤重金属修复方面显示出巨大的潜力;然而，人们对其 As（III）螯合的氧化还原反应性和相应的氧化还原活性成分仍然知之甚少。本研究研究了 GRSP 的光化学性质及其对 As（III）的氧化/吸附机制。结果表明，紫外线照射触发了 GRSP 中的电子转移和活性氧（ROS）的产生，从而促进了 As（III）氧化，促进率从 43.34 % 到 111.1 %。As（III）的氧化既发生在 GRSP 光形成孔上，也发生在光形成电子的氧还原产物的 ROS 反应中。OH• 和 H2O2 在 GRSP 氧化 As（III）中起重要作用，尤其是在碱性条件下。此外，GRSP 中 Fe（III）的存在促进了 OH• 的形成，并且它是对 As（III）的氧化能力。As（III）与 GRSP 表面的 -COOH、-OH 和 -FeO 基团的结合是通过表面络合发生的。总的来说，这些发现为 GRSP 上的氧化还原活性部分和 Fe（III）在促进 As（III）氧化中的作用提供了新的见解，这将有助于加深我们对土壤中 As（III）迁移和转化的理解。

更新日期：2024-09-06

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