STUDY OF THE ADSORPTION EFFICACY OF Cr (III) ON A METAL OXIDE-BASED MATERIAL DERIVED FROM THE QUARTZ SAND ENRICHMENT PROCESS.
Alma Shehu ,Sonila Duka, Loreta Vallja, Nevila Broli, Majlinda Vasjari,
In the present study, a metal oxide based material, derived from the enrichment process of quartz coastal sand was used as adsorbent for the removal of chromium (III). Following additional modification of the adsorbent, the effect of operational parameters including pH, contact time and Cr (III) concentration were studied according to one-factor-at-a-time procedure. Obtained results revealed that selected material exhibited higher adsorption efficacy in alkaline solution (pH = 6-9). The maximum removal efficacy (>93%) was achieved after 180 minutes of contact time, adsorbent dosage 5 g/L and initial chromium concentration 20 mg/L. The adsorption isotherms were better described by the Freundlich equation (R2 = 0.934). Adsorption of trivalent chromium ions onto selected material followed the pseudo second order model (R2 = 0.996). Hence, the residual materials derived from the enrichment processes of quartz sand can be used as alternative adsorbent for the removal of trivalent chromium ions from aqueous solutions.