Biowaste-derived Ni/NiO decorated-2D biochar for adsorption of methyl orange

• Published in: Journal of environmental management Vol. 344; p. 118418
• Main Authors: Mon, Phyu Phyu, Cho, Phyu Phyu, Chandana, L., Srikanth, V.V.S.S., Madras, Giridhar, Ch, Subrahmanyam
• Format: Journal Article
• Language: English
• Published: England Elsevier Ltd 15.10.2023
• Subjects: Adsorption; Chitosan; Methyl orange; NiCl2; Persulfate activation; Chitosan; Persulfate activation; Adsorption; Methyl orange; NiCl2; NiCl
• ISSN: 0301-4797; 1095-8630
• DOI: 10.1016/j.jenvman.2023.118418

Eco-friendly carbothermal techniques were used to synthesize nanocomposites of biowaste-derived Ni/NiO decorated-2D biochar. The use of chitosan and NiCl2 in the carbothermal reduction technique was a novelty to synthesize the Ni/NiO decorated-2D biochar composite. Potassium persulfate (PS) was found to be activated by Ni/NiO decorated-2D biochar, which is thought to oxidize organic pollutants through an electron pathway designed by the reactive complexes formed between PS and the Ni/NiO biochar surface. This activation led to the efficient oxidation of methyl orange and organic pollutants. Analyzing Ni/NiO decorated-2D biochar composite before and after the methyl orange adsorption and degradation procedure allowed us to report on the process of its elimination. The Ni/NiO biochar with PS activation showed higher efficiency than Ni/NiO decorated-2D biochar composite as this material was able to degrade over 99% of the methyl orange dye. The effects of initial methyl orange concentration, dosages effect, solution pH, equilibrium studies, kinetics, thermodynamic studies, and reusability were examined and evaluated on Ni/NiO biochar. [Display omitted] •We have invented a method for producing economically feasible Ni/NiO decorated-2D biochar.•Normal and Potassium persulfate (PS) activation of Ni/NiO biochar composites is compared for Methyl Orange (MO) adsorption.•Ni/NiO decorated-2D biochar provides qmax of 139.47 mg/g for MO adsorption and reached equilibrium within 50 min.•The adsorption and degradation efficiency of 82% and 99% towards MO was achieved within 50 min and 10 min.•The Ni–NiO/PS activation utilization efficiency might be the most effective way to degrade the methyl orange dye.