Biomass Derived Sheet-like Carbon/Palladium Nanocomposite: An Excellent Opportunity for Reduction of Toxic Hexavalent Chromium

Abstract

Palladium nanoparticles (Pd NPs) immobilized on a garlic skin-derived activated carbons (GACs) is reported. The morphology, structure, surface compositions, and textural properties of the GACs and Pd@GAC catalyst were investigated by a variety of physicochemical characterization techniques, which revealed a dispersion of Pd NPs with average particle size of ca. 21 nm on sheet-like graphitized GACs with surface areas and pore volumes as high as 1836 m2 g–1 and 0.89 cm3 g–1, respectively. As a result, the Pd@GAC with a Pd loading of ca. 1–2 wt% exhibited superior activity for catalytic reduction of toxic Cr­(VI) to Cr­(III) surpassing most metal-based catalysts reported in the literature. As evidenced by a comprehensive UV–vis spectrophotometric study, the eco-friendly Pd@GAC catalyst reported herein, which can be facilely prepared with biowaste feedstocks, also showed excellent catalytic performances for efficient reduction of Cr­(VI) with extraordinary stability and recyclability over at least five repeated catalytic test cycles.

Rapid synthesis of ultrasmall platinum nanoparticles supported on macroporous cellulose fibers for catalysis

“…Pt and Pd). [27][28][29] In the case of FA, low pH can cause the transition metal catalysts to dissolve in aqueous solution. Therefore, there is a need for the utilization of noble metal NPs due to their chemical and physical robustness against FA.…”

“…The generated CO then adsorbs onto the PtNP surface, and has the ability to reduce organic and inorganic species while being oxidized to CO 2 . 70,71 The third pathway, also known as the formate pathway, involves the formation of formate and its subsequent oxidation to CO 2 and the release of H 2 gas. 72,73 Therefore, either way, FA decomposition can simultaneously reduce organic and inorganic species in the presence of PtNPs.…”

Green mediated synthesis of palladium nanoparticles using aqueous leaf extract of Gymnema sylvestre for catalytic reduction of Cr (VI)

“…Amongst them, Cr (VI) is the most hazardous one. Cr (VI) has hazardous effects on organisms and its removal from soil and water bodies has gained a considerable attention in last few decades [1,2]. Cr (VI) is known a highly toxic, non-biodegradable and cancer causing material.…”

Catalytic Activity of Bimetallic (Ruthenium/Palladium) Nano‐alloy Decorated Porous Carbons Toward Reduction of Toxic Compounds

“…[46] It was still challenging nowadays to developa ne fficient approachf or remediation or reductivet ransformation (Cr VI !Cr III )w ith as uitable catalysti n mild conditions. [47] Fe salts and sulfur compounds as the reducing agents may produce secondary waste. [48] They are impractical to treat large amount of Cr VI containing wastewater.F Ai s an alternative to reducing via dehydrogenation (HCOOH!…”