Synthesis of high performance Ni3C-Ni decorated thermally expanded reduced graphene oxide (TErGO/Ni3C-Ni) nanocomposite: A stable catalyst for reduction of Cr(VI) and organic dyes

Catalytic reduction of in-flow aqueous Cr(vi) using a slurry of activated carbon fiber-supported Ni nanoparticles in a coiled flow inverter

“…The apparent rate constant is determined to be 1.94 min −1 . Similar batch literature studies using the Ni-based catalysts have reported the rate constant in the range of 1.05–2.74 min −1 for the Cr( vi ) to Cr ( iii ) reduction, 29,35 corroborating the effectiveness of the CFI technology for sustaining a good mixing in the reactor.…”

Inorganic nanoparticles for reduction of hexavalent chromium: Physicochemical aspects

“…Reduced graphene oxide does not only stabilize Ni nanoparticles but also enhances their catalytic activity towards reduction of Cr(VI). Fabrication and stabilization of Ni nanoparticles in the form of Ni 3 C-Ni on thermally expanded reduced graphene oxide (TERGO) has been also reported by Akram et al (2019) .

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“…Nickel nanoparticles are well known for their catalytic potential towards different reactions but to the best of our survey, only few reports are available on their use in reduction of Cr(VI) to Cr(III) with formic acid ( Zhu et al, 2019 ; Bhowmik et al, 2014 ; Akram et al, 2019 ). Although Ni is non-noble metal like Fe but it cannot reduce Cr(VI) without additional source of hydrogen.…”

“…Although Ni is non-noble metal like Fe but it cannot reduce Cr(VI) without additional source of hydrogen. For example, Akram et al (2019) have reported thermally expanded reduced graphene oxide (TERGO) decorated with nickel carbide-nickel nanoparticles (Ni 3 C-NiNPs) to obtain (TER/Ni 3 C-NiNPs) nano-catalytic system with excellent catalytic potential towards Cr(VI) reduction to Cr(III) in aqueous medium. No additional reducing agent and capping agent was used for nanocomposite fabrication.…”

Photocatalytic Cr(VI) elimination over BUC-21/N-K2Ti4O9 composites: Big differences in performance resulting from small differences in composition

“…Therefore, the removal of Cr(VI) from water is necessary. Among the various treatment methods available, including adsorption, electro-reduction, chemical reduction, and others, photocatalysis is typically used to reduce highly toxic Cr(VI) to low-toxicity Cr(III) because of its simple working conditions and environmental sustainability [10][11][12].…”