Recent innovative research on chromium (VI) adsorption mechanism

Chromium (VI) is an important heavy metal commonly found in tannery wastewater. In order to manage this type of environmental pollution, there needs to be a better understanding of Cr(VI) adsorption mechanisms. This article reviews the recent usage of various adsorbents to adsorb Cr(VI) from wastewater. The paper provides an overview of the removal capacity of numerous adsorbents in terms of Cr(VI) speciation, empirical modeling, surface complexation model (SCM) and spectroscopic measurements carried out by a wide number of researchers. Special emphasis was given to summarise various proposed Cr(VI) adsorption mechanism. It has been noted that Cr(VI) adsorption has been studied using a wide range of adsorbent materials with adsorption capacity from low to higher depending several factors including the…