Single-step removal of Hexavalent chromium and phenol using meso zerovalent iron.,Chemosphere

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Single-step removal of Hexavalent chromium and phenol using meso zerovalent iron.
Chemosphere ( IF 8.1 ) Pub Date : 2020-01-24 , DOI: 10.1016/j.chemosphere.2020.125912
Selvaraj Ambika ₁ , M Devasena ₂ , Indumathi M Nambi ₃

Affiliation

Novel meso-zero valent iron (mZVI) was investigated for treating complex wastewater containing toxic heavy metal Cr6+ and organic compound phenol. This study is first of its kind illustrating coupled removal in single-step with H2O2 playing a major role as an oxidant and reductant. The mechanism involved was electron transfer from Fe0/2+ to Cr6+ resulting in Fe2+/3+ which in turn was consumed for phenol oxidation returning as Fe2+ into the system for further Cr6+ reduction. While comparing, single-step simultaneous removal of Cr6+ and phenol showed better performance in terms of pollutant removal, Fe2+/3+ recurrent reaction and precipitation generation, double-tep sequential removal performed better in iron active-corrosion time. It was also observed that the entire redox cycle of Cr6+-Cr3+-Cr6+ was reusable for co-contaminant phenol degradation at all pH with the recurrence of Fe2+-Fe3+-Fe2+. The proposed technique was checked for its viability in a single batch reactor and the complex chemistry of the reactions are unfolded by conducting chemical speciation and mass balance study at every stage of reaction. The unique functioning of mZVI was proven with micro-analysis of ZVI's surface and compared with granular ZVI, cZVI. The results obtained from this study open the door for a safer and cleaner single treatment system in removing both toxic heavy metals and organic compounds from contaminated surface water, groundwater and many such industrial effluents.

中文翻译：

使用内消旋零价铁一步一步除去六价铬和苯酚。

研究了新型中零价铁（mZVI）用于处理含有毒重金属Cr6 +和有机化合物苯酚的复杂废水。这项研究是同类研究中的首例，它说明了H2O2在氧化剂和还原剂中起主要作用的单步偶联去除方法。涉及的机理是电子从Fe0 / 2 +转移至Cr6 +，从而生成Fe2 + / 3 +，进而被苯酚氧化消耗，以Fe2 +的形式返回到系统中以进一步还原Cr6 +。相比之下，单步同时去除Cr6 +和苯酚在污染物去除，Fe2 + / 3 +循环反应和沉淀生成方面表现出更好的性能，双触头顺序去除在铁的活性腐蚀时间内表现更好。还观察到，在所有pH下，随着Fe2 + -Fe3 + -Fe2 +的重复出现，Cr6 + -Cr3 + -Cr6 +的整个氧化还原循环可用于共污染苯酚降解。在单批反应器中检查了所提议的技术的可行性，并通过在反应的每个阶段进行化学形态和质量平衡研究，揭示了反应的复杂化学。通过对ZVI表面的微观分析证明了mZVI的独特功能，并与颗粒状ZVI，cZVI进行了比较。这项研究获得的结果打开了一个更安全，更清洁的单一处理系统的大门，该系统可以从受污染的地表水，地下水和许多此类工业废水中去除有毒重金属和有机化合物。在单批反应器中检查了所提议的技术的可行性，并通过在反应的每个阶段进行化学形态和质量平衡研究，揭示了反应的复杂化学。通过对ZVI表面的微观分析证明了mZVI的独特功能，并与颗粒状ZVI，cZVI进行了比较。这项研究获得的结果打开了一个更安全，更清洁的单一处理系统的大门，该系统可以从受污染的地表水，地下水和许多此类工业废水中去除有毒重金属和有机化合物。在单批反应器中检查了所提议的技术的可行性，并通过在反应的每个阶段进行化学形态和质量平衡研究，揭示了反应的复杂化学。通过对ZVI表面的微观分析证明了mZVI的独特功能，并与颗粒状ZVI，cZVI进行了比较。这项研究获得的结果打开了一个更安全，更清洁的单一处理系统的大门，该系统可以从受污染的地表水，地下水和许多此类工业废水中去除有毒重金属和有机化合物。

更新日期：2020-01-26

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