Adsorption and catalytic reduction of hexavalent chromium based on nanomaterials: A review on metal, metallic oxide, metallic sulfide and carbon-based catalyst.

Chromium (Cr) is widely recognized as a significant environmental contaminant and a major contributor to global pollution. As a result, there is a strong emphasis on developing effective methods for the removal and reduction of Cr(VI). This review examines various applications of nanomaterial catalysts, including metallic oxides, metals, metallic sulfides, and carbon-based materials. These materials encompass naturally occurring substances, synthetically produced compounds, and artificially modified forms, all of which typically exhibit favorable adsorption properties and catalytic activity. We systematically summarize the mechanisms of adsorption and catalytic reduction associated with these nanomaterials, including photocatalysis, electrocatalysis, and direct catalysis. Finally, we explore the future directions and prospects of nanomaterials in environmental remediation, highlighting the key challenges that must be addressed in this field.