零价铁(ZVI)去除Cu^(2+)的特性及机制研究

Characteristics and Mechanism of Cu^(2+) Removal by Zero-Valent Iron(ZVI) from Aqueous Solution

研究了零价铁去除水溶液中铜离子的影响因素及动力学特性,并利用X射线衍射(XRD)分析对反应机制进行了探讨.结果表明,当溶液中Cu2+的浓度为300 mg/L,零价铁的用量为1 g/L时,Cu2+的去除率>99%.Cu2+的去除速度很快,且反应前30min零价铁去除Cu2+的过程可以用一级反应动力学方程模拟.零价铁去除Cu2+的机制主要基于氧化还原反应,Cu2+的还原产物主要为Cu和Cu2O.

The influencing factors and kinetics of copper ions removal from aqueous solution by zero-valent iron （ZVI） was investigated, the mechanism of Cu2＋ removal was analyzed using X-ray diffraction （XRD）. The experimental results showed that ZVI had been turned out to be an effective tool for the removal of Cu2＋ from aqueous solution. More than 99 % of Cu2＋ could be removed at an initial concentration of 300 mg/L by ZVI at the dosage of 1 g/L. The removal of Cu2＋in the first 30 min could be described by the first-order kinetic model with high correlation coefficient. The XRD analysis suggested that the mechanism for Cu2＋ removal was mainly based on the redox reaction, which resulted in the formation of Cu2＋ and CuO as the main reduced products of Cu2＋ .