黄铁矿处理重金属废水的光谱表征

将反射光谱和吸收光谱用于黄铁矿处理酸性重金属废水的研究，探讨了黄铁矿的表面反应以及黄铁矿与重金属的相互作用。漫反射红外光谱分析证实，在处理废水过程中，黄铁矿中表面羟基与重金属离子发生反应;并通过考察黄铁矿中碳酸盐，合理解释了黄铁矿处理酸性重金属废水后的溶液自然均趋于中性(pH 7)的现象。可见区的反射光谱用于表征处理过程中的黄铁矿的颗粒及比表面变化，解释了黄铁矿在重复使用时其活性反而增强的原因。吸收光谱及XPS表征表明，黄铁矿处理含Cr(Ⅵ)废水，是一个由Cr(Ⅵ)到Cr3+再到Cr(OH)₃的吸附沉淀过程。

Spectroscopic Characterization of Heavy Metal Wastewater Treatment by Pyrite

Treatment of acidic heavy metal wastewater by pyrite was studied by reflectance spectroscopy and absorption spectroscopy. The surface reaction in pyrite and the interaction between pyrite and heavy metal were investigated. The diffuse reflectance FTIR spectroscopy (DRIFTS) showed that the surface hydroxyls in pyrite reacted with heavy metal ion in the process of wastewater treatment, and furthermore, the phenomenon of the acidic wastewater driven to neutrality(pH 7) naturally after treatment was reasonably explained by analyzed carbonate in pyrite. The reflectance spectroscopy in visible region can be used to characterize the change of mineral particle and specific surface in this treatment process, and the reasons for the activity of pyrite increasing in repetitive use were explained. A process of adsorption-precipitation from Cr ( VI) to Cr3+ and to Cr(OH)3 was proved by absorption spectroscopy and XPS during the treatment of Cr(VI)-bearing wastewater by pyrite.