The effects of nanoparticle dosage, initial hexavalent chromium concentration, pH value, reaction temperature, and initial concentration of humic acid (HA) on chromate (CrO42−) removal from landfill leachate by nanoscale zero-valent iron (NZVI) and hematite (α-Fe2O3) nanoparticles were examined in the present investigations. The Cr(VI) removal rate decreased as the initial Cr(VI) concentration and the reaction temperature increased, whereas corresponding removal rate by NZVI was higher than that of α-Fe2O3. The optimum pH for the removal of Cr(VI) by NZVI was found to be 5.0 and more than 99.0% of Cr(VI) was removed within 5 h. However, the removal rate by α-Fe2O3 decreased as pH increased. Presence of HA resulted in substantial reduction in the rate and extent of Cr(VI) removal by NZVI, whereas Cr(VI) removal rate by α-Fe2O3 did not significantly decrease as HA concentration increased from 0.5 g/L to 3.0 g/L. Increasing the dosage of nanoparticles enhanced the rate constant and the removal of Cr(VI) by NZVI and α-Fe2O3 followed pseudo-first-order reaction kinetics. The information should be very useful for the successful application of NZVI and α-Fe2O3 for the treatment of groundwater or raw wastewater.
Keywords: hexavalent chromium, humic acid, nanoscale zero-valent iron