[Reflectance spectroscopic characterization of thallium wastewater treatment by pyrite and pyrite slag].

The surface hydroxyls in pyrite and slag were investigated, and the result showed that the hydroxyls in pyrite slag were induced by residual pyrite. The diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) indicated that the surface hydroxyls in pyrite and slag reacted with thallium ion in the process of wastewater treatment. The 3 550 cm(-1) peak and 3 402 cm(-1) peak weakened after pyrite and slag treatment, nevertheless the 3 550 cm(-1) peak lowered and shifted to higher frequencies by about 70 cm(-1) with slag treatment. The reflectance spectroscopy in visible region was used to characterize the change of particle and specific surface in these treatment process, and furthermore, the fact that the activity of both pyrite and slag increased in repetitive use was explained.