Zero-valent iron nanoparticles embedded into reduced graphene oxide-alginate beads for efficient chromium (VI) removal

Inorganic nanoparticles for reduction of hexavalent chromium: Physicochemical aspects

“…Reduction of Cr(VI) by inorganic nanoparticles is termed as enhanced reduction while reduction of Cr(VI) by some suitable reducing agent in the presence of inorganic nanoparticles (nano-catalysts) is known as catalytic reduction. The use of inorganic nanoparticles as reductants ( Fazlzadeh et al, 2017 ; Lv et al, 2017 ; Qian et al, 2017 ; Su et al, 2016 ; Zhou et al, 2020 ) as well as catalysts ( Lv et al, 2020 ; Shao et al, 2017 ; Zhang et al, 2018 ) for Cr(VI) reduction has become the subject of interest due to high efficiency, low cost, environment friendly approach, applicability on industrial scale and no harmful byproduct formation in comparison to organic matter where re-oxidation may occur ( Wang et al, 2019 ). In this treatment, Cr(VI) is completely converted into Cr(III) which has low mobility as compared to Cr(VI) ( Li et al, 2016a ).…”

Recent advances in hexavalent chromium removal from aqueous solutions by adsorptive methods

“…Besides, reductants like suldes, ferrous iron, thiosulphate, zerovalent iron, and C/FeS/Fe composites have also been used. 18,72,164,165 Several studies have accounted for the reduction of Cr(VI) during adsorption 3,4,16,30,32,166,167 while others have ignored. 21,54,92,147,148,158,168,169 Energy-dispersive X-ray spectroscopy and X-ray photoelectron spectroscopy (XPS) has been used to account for the presence or absence of Cr(III) in the surface of adsorbents aer adsorption.…”

Preparation of Activated Carbon Supported Bead String Structure Nano Zero Valent Iron in a Polyethylene Glycol-Aqueous Solution and Its Efficient Treatment of Cr(VI) Wastewater

“…The following are available online at http://www.mdpi.com/1420-3049/25/1/47/s1, Figures S1-S6, Tables S1 and S2 [11,26,33,48,49,[55][56][57][58][59][60][61][62].…”