| Autor: |
Pervaiz E; Solid State Functional Materials Research Lab, Ningbo Institute of Materials Technology and Engineering (NIMTE), Chinese Academy of Sciences, Ningbo 315201, People's Republic of China. Department of Chemical Engineering, School of Chemical & Materials Engineering (SCME), National University of Sciences & Technology (NUST), H-12 Islamabad, 44000 Pakistan., Syam Azhar Virk M, Bingxue Z, Yin C, Yang M |
| Jazyk: |
angličtina |
| Zdroj: |
Nanotechnology [Nanotechnology] 2017 Sep 20; Vol. 28 (38), pp. 385703. Date of Electronic Publication: 2017 Jul 27. |
| DOI: |
10.1088/1361-6528/aa8297 |
| Abstrakt: |
The fabrication of nanograins with a uniform morphology wrapped with reduced graphene oxide (RGO) in a designed manner is critical for obtaining a large surface, high porosity and efficient catalytic ability at mild conditions. Hybrid structures of metal oxides decorated on two-dimensional (2D) RGO lacked an interface and channels between the individual grains and RGO. The present work focuses on the synthesis of RGO-wrapped Co 3 O 4 nanograin architecture in micron-sized polyhedrons and the ability to reduce aromatic nitro compounds. Doping N in the designed microstructure polyhedrons resulted in very large surface area (1085.6 m 2 g -1 ) and pore density (0.47 m 3 g -1 ) microcages. Binding energies from x-ray photoelectron spectroscopy (XPS) and Raman intensities confirmed the presence of doped N and RGO-wrapped around Co 3 O 4 nanograins. However, the morphology and microstructure was supported by FESEM and HRTEM images revealing the fabrication of high integrity RGO-Co 3 O 4 microstructure hybrids composed of a 10 nm grain size with narrower grain size distribution. Ammonia treatment produced interconnected channels and dumbbell pores that facilitated ion exchange between the catalyst surface and the liquid medium at the grain boundary interfaces, and offered less mass transport resistance providing fast adsorption of reactants and desorption of the product causing surface renewal. Prepared N-RGO-Co 3 O 4 shows the largest percentage reduction (96%) of p-nitrophenol (p-NP) at room temperature as compared to pure Co 3 O 4 and RGO-Co 3 O 4 nanograin microstructures over 10 min. Fabricated architectures can be applied effectively for fast and facile treatment of industrial waste streams with complex organic molecules. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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