Chromium (VI) Removal from Waste Water using Low-Cost Adsorbent-Review

Abstract

Heavy metal contamination in water is one of the world's most severe environmental and ecological issues. Mining, agricultural, and industrial activities contribute to stream heavy metal contamination. The Environmental Protection Agency has classified chromium as one of the most toxic and hazardous metals. Chromium is removed from aqueous solutions and industrial effluents in various ways. Various adsorbents are utilized to remove Cr(VI) metal from wastewater. The removal of chromium from wastewater using adsorbents has seen significant advances in efficiency and cost. However, the recycling of utilized adsorbents received little attention. When the chromium concentration is low (1–100 mg/l), current approaches to extract chromium ions from wastewaters are costly and unsuccessful. As a result, developing alternative technologies is critical right now. Adsorption system that uses dead biomass to collect chromium in wastewater can be utilized to replace traditional processes for chromium contamination remediation. adsorbents are made from biomass that arepresent in abundance as waste is a step toward a prospective method because of its high absorption capacity and low-cost raw material source. This review article will discuss various agricultural waste-based adsorbents and their regeneration techniques for the effective removal of Cr(VI) from the aqueous solution in an cost effectiveand ecofriendly approach.