KINETIC STUDY FOR THE REMOVAL OF Cr(VI) IONS FROM AQUEOUS SOLUTIONS BY NATURAL PEMZA

Abstract

A large part of industries discharge wastewater containing toxic substances without any prior treatment. Pollution of the environment, especially with water containing heavy metals, is a very serious problem today. Among these heavy metals, chromium is one of the most dangerous. In this paper, for the removal of Cr(VI) from aqueous solutions, we used pemza, raw inorganic material from Bojanciste, near Kavadarci, Republic of North Macedonia. With special emphasis, we have focused on studing the kinetics of the adsorption process of chromium ions with low-cost adsorbent, pemza. From the results of this research we have concluded that the correlation coefficients are higher (R²>0.99) for pseudo second–order reactions. At the same time, the experimental values q_e agree with the values calculated by applying this kinetic model. This indicates that the kinetic reaction for the Cr(VI)-pemza system proceeds according to this mechanism.