Inorganic nanoparticles for reduction of hexavalent chromium: Physicochemical aspects

Abstract

Graphical abstract

Recent Advances in Biomass-Based Waste Materials for the Removal of Chromium (VI) from Wastewater: A Review

“…Recently, several review papers on removing Cr(VI) from water and wastewaters by adsorption process have been published [23][24][25]. Most of the reviews focused only one specifi c type of adsorbents such as carbon nanotubes [26], activated carbon derived from biomass [27], carbonaceous nanomaterials [28],microporous polymers [29], silica-based materials [30], chitosanbased nanocomposite [31], magnetic iron oxides [32], nanoparticle-based adsorbent [33,34], polyaniline-based materials [35], metal-organic framework (MOF)derivatives and their composites [36], and natural minerals [37]. This study off ers a signifi cant and thorough review on removing Cr(VI) from water by using biomass-based waste materials (BMWs) as adsorbents, especially those that have emerged in recent years.…”

Silver nanoparticles supported on smart polymer microgel system for highly proficient catalytic reduction of Cr+6 to Cr+3 with formic acid

“…[ 46 ] Several reports on pathway of Cr +6 reduction with FA in the company of noble metal nanoparticles have been published which have been recently reviewed by some of us. [ 3 ] The initial step of nanoparticles catalyzed reduction of Cr +6 on the surface of noble metal nanoparticles may be dehydrogenation or decarbonylation of FA. In case of dehydrogenation, FA is converted into CO 2 and H 2 , although CO and H 2 O are produced in case of decarbonylation of FA.…”

“…Several industrial units such as leather tanning, chrome plating, electroplating, and wood preservation involve use of chromium compounds at large scale. [1][2][3][4] Most of chromium compounds are water soluble, and excess of these compounds is thrown as aqueous waste into water bodies. Hexavalent chromium (Cr +6 ) has been found 300 times more toxic as compared with trivalent chromium (Cr +3 ).…”

Metallic Copper‐Containing Composite Photocatalysts: Fundamental, Materials Design, and Photoredox Applications

“…The photochemical reduction of Cr(VI) to Cr(III) by semiconductor photocatalysis technique has been made extensive efforts in recent years. [95] Sulagna Patnaik et al [38c] constructed a MoO 3 /g-C 3 N 4 composite, and introduced Cu nanoparticles by impregnation method, which was used in the reduction of hexavalent chromium. The preparation route is shown in Figure 9c.…”