Abstract

Chromium is a dangerous heavy metal that is a frequently observed contaminant of aquatic systems due to its industrial applications. Although chromium is very important for several industries, the environmental problems associated with Cr (VI) are severe. Adsorptive treatment has emerged as an efficient treatment technology used in the last decades by various researchers for the removal of Cr (VI) from wastewater streams and it is being done considering numerous naturally available biosorbents. Herein, the intelligence of plant waste-based biosorbents in their native and chemically modified state to achieve the best Cr (VI) removal in aqueous system is reviewed. The kinetics and mechanism of removal of these compounds are studied as well. Both the pH of the solution and the initial concentration of Cr (VI) are the significant factors affecting the Cr removal. A Cr removal process from the water samples was interpreted in terms of an adsorption, and/or adsorption-coupled reduction. With detailed coverage on various biosorbents like maximum adsorption capacities, and adsorbent desorption and regeneration, the plant-based biosorbents are chosen as a major element for removal of Cr (VI) in water.