Facile synthesis of ultra-thin CoxNi(1-x)/C nano-sheets and their remarkable catalytic properties in 4-nitrophenol reduction. Issue 4 (August 2018)

• Record Type: Journal Article
• Authors: Zhao, Yunlong; Cao, Baoyong; Wang, Xiaopeng; Wang, Xinyu; Al-Mamun, Mohammad; Zhao, Huijun; Wang, Jide; Zheng, Yajie; Su, Xintai
• Is Part Of: Journal of environmental chemical engineering. Volume 6:Issue 4(2018)
• Page Start: 5239
• Page End: 5248
• Publication Date: 2018-08
• Subjects: CoxNi(1-x)/Cnano-sheets -- Bimetallic nanocrystals -- Potassiumfulvic acid -- P-Nitrophenol -- P-Aminophenol; Chemical engineering -- Environmental aspects -- Periodicals; Environmental engineering -- Periodicals; Chemical engineering -- Environmental aspects; Environmental engineering; Periodicals; 660.0286
• DOI: 10.1016/j.jece.2018.08.023
• Languages: English
• ISSNs: 2213-2929

Abstract

Graphical abstract: Highlights: The thickness of 10∼30 nm Cox Ni(1-x) /C nanosheets (NSs) has been obtained by Molten salt methods. The low-cost Potassium fulvic acid as carbon resources was firstly used to obtain Cox Ni(1-x) /C NSs. With the 600 °C and ratio of Ni and Co is 1/1, the catalyst has the highest catalytic activity. The kapp of the Co0.5 Ni0.5 /C-600 NSs has maximum rate constant and is 1.3949 min −1 . Abstract: The mesoporous of ultra-thin Cox Ni(1-x) /C nano-sheets (NSs) have been synthesized by a molten-salt calcination approach. The nanocrystalline, composition, morphology and structure of the hybrid nano-sheets are confirmed with phenetic analysis of XRD, EDS, XPS, TEM and SEM. The as-synthesized of Cox Ni(1-x) /C NSs were obtained under varied temperature and ratio of Ni and Co, and the ultra-thin carbon species with thickness of 10–30 nm were fabricated from a novel and economical carbon source (potassium fulvic acid, P-FA). The Co0.5 Ni0.5 /C-600 NSs that was obtained from calcination temperature 600 °C and molar ratio of Co:Ni = 1:1 showed the best catalytic activity though the reduction of 4-nitrophenol (4-NP) as a common benchmark reaction. Furthermore, the homologous apparent rate constant kapp of the Co0.5 Ni0.5 /C-600 nanocatalyst is 1.3949 min −1 for reduction of 4-NP in presence of NaBH4, and all rate constant for Cox Ni(1-x) /C NSs were calculated with Pseudo-first rate equation. The excellent catalytic activity of the nanocatalyst was attributed to the larger specific surface area with 202.8 m 2 /g, excellent electrical conductivity of carbon material and synergistic effect of cobalt and nickel bimetal. We believe that our method can provide useful assistance for the synthesis of humic acid-based materials, and those may be applied to other domains.