砷解毒的绿色途径：As2O3 机械化学转化为 As(0),ACS Sustainable Chemistry & Engineering

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砷解毒的绿色途径：As2O3 机械化学转化为 As(0)
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2024-02-07 , DOI: 10.1021/acssuschemeng.3c08074
Jianyong Che ₁ , Wenjuan Zhang _{1,

2} , Edouard Asselin ₃ , Kashif Mairaj Deen ₃ , Shuyue Feng ₂ , Yongqiang Chen _{1,

2} , Chengyan Wang _{1,

2}

Affiliation

随着含砷资源的不断开采和砷污染的日益关注，砷的处理已成为全球性挑战。元素砷由于其无毒性质，被认为是砷解毒和缓解的首选形式。我们引入了一种创新且环保的方法，通过室温下的机械化学处理将剧毒的三氧化二砷转化为无毒的元素砷。利用锌粉作为还原剂，乙酸作为反应介质，我们实现了高达 92.5% 的还原效率，生产出纯度约为 99% 的单质砷。热力学分析揭示了乙酸在稳定反应体系和消除胂形成方面的关键作用。密度泛函理论计算进一步证实锌表面H ₃ AsO ₃的还原是Zn-CH ₃ COOH-As ₂ O ₃体系中的主要反应。机械力的引入降低了反应的相对能量，从而在相对温和的条件下产生了优异的还原性能。这些发现可以为含砷废物的安全处置铺平道路，并提供减少三氧化二砷毒性的可持续途径。

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Green Route to Arsenic Detoxification: Mechanochemical Transformation of As2O3 to As(0)

With the continuous exploitation of arsenic-containing resources and growing concern over arsenic contamination, the disposal of arsenic has become a global challenge. Elemental arsenic, because of its nontoxic nature, is considered a preferred form for arsenic detoxification and mitigation. We introduce an innovative and eco-friendly method to convert the highly toxic arsenic trioxide into nonpoisonous elemental arsenic via a mechanochemical processing at room temperature. Utilizing zinc powder as the reductant and acetic acid as the reaction medium, we achieved a remarkable reduction efficiency of 92.5%, producing elemental arsenic of approximately 99% purity. Thermodynamic analysis revealed the pivotal role of acetic acid in stabilizing the reaction system and eliminating the formation of arsine. Density functional theory calculations further confirmed that the reduction of H₃AsO₃ on the zinc surface was the dominant reaction in the Zn–CH₃COOH–As₂O₃ system. The introduction of mechanical force lowered the relative energy of the reaction, resulting in superior reduction performance under relatively mild conditions. These findings could pave the way for the safe disposal of arsenic-containing waste and offer a sustainable route to reducing the toxicity of arsenic trioxide.

更新日期：2024-02-07

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