Raman and Fourier transform infrared spectroscopic study of pyromorphite-vanadinite solid solutions.

Due to the great range of the application fields for apatites, there is a strong need to complete the data set determining the properties of these minerals. In this study, Raman and Infrared spectra of the phases from pyromorphite Pb(PO)Cl - vanadinite Pb(VO)Cl series were investigated. Totally, 9 samples (2 end-members and 7 solid solutions of the series) were synthesized at 25°C and pH=3.

Removal of lead and phosphate ions from aqueous solutions by organo-smectite.

Smectite has been modified using hexadecyltrimethyl ammonium bromide in an amount of double cationic exchange capacity. This alteration makes it possible to use organo-smectite as a sorbent to remove anionic forms. The experiment consisted of the interchangeable sorption of phosphate(V) and lead(II) by organo-smectite.