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Radiolytic formation of non-toxic Cr(III) from toxic Cr(VI) in formate containing aqueous solutions: A system for water treatment

机译:在含甲酸盐的水溶液中由有毒的六价铬放射分解形成无毒的六价铬:水处理系统

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摘要

Toxic hexavalent chromium Cr(VI) in the form of potassium dichromate was radiolytically reduced to non-toxic trivalent chromium Cr(III) in N_2O-saturated aqueous solutions containing formate. This reduction by the electron donor (CO_2H·/CO_2~(·-)) produced by continuous radiolysis of water, was a linear function of the absorbed dose. This reaction was pH and dose rate dependent. pH was an important parameter in the reduction, as it affects both chemical speciation of Cr(VI) and formate. Possible mechanisms related to dose rate dependence of removal of Cr(VI) are presented. At pH 3 a decrease in the radiation induced reduction of Cr(VI) was observed with increasing hydrogen peroxide concentration. A mechanism to account for this variation is proposed. These findings suggest that irradiation of Cr(VI) solutions in presence of formate can be effective, economical and simple means for treatment of waste water contaminated with hexavalent Cr(VI).
机译:在含甲酸盐的N_2O饱和水溶液中,重铬酸钾形式的有毒六价铬Cr(VI)被辐射分解为无毒的三价铬Cr(III)。水的连续辐射分解所产生的电子给体(CO_2H·/ CO_2〜(·-))的这种减少是吸收剂量的线性函数。该反应是pH和剂量率依赖性的。 pH是还原反应中的重要参数,因为它会影响Cr(VI)和甲酸的化学形态。提出了与剂量率依赖性去除Cr(VI)有关的可能机理。在pH 3下,随着过氧化氢浓度的增加,观察到了辐射诱导的Cr(VI)还原的减少。提出了解决这种变化的机制。这些发现表明,在甲酸存在下辐射Cr(VI)溶液可以是一种有效,经济和简单的方法,用于处理被六价Cr(VI)污染的废水。

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