One-step synthesis of N-doped metal/biochar composite using NH3-ambiance pyrolysis for efficient degradation and mineralization of Methylene Blue

Date

2019-04-01

Author

Mian, Md Manik
Liu, Guijian
Yousaf, Balal
Fu, Biao
Ahmed, Rafay
Abbas, Qumber
Munir, Mehr Ahmed Mujtaba
Liu Ruijia, Liu Ruijia

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A series of new biochar-supported composite based on the combination of biochar and metallic nanoparticles (NPs) were produced through single-step pyrolysis of FeCl3-Ti(OBu)(4) laden agar biomass under NH3 environment. The physiochemical properties of composites were characterized thoroughly. It has found that heating temperature and N-doping through NH3-ambiance pyrolysis significantly influence the visible-light sensitivity and bandgap energy of composites. The catalytic activities of composites were measured by degradation of Methylene Blue (MB) in the presence or absence of H2O2 and visible-light irradiation. Our best catalyst (N-TiO2-Fe3O4-biochar) exhibits rapid and high MB removal competency (99.99%) via synergism of adsorption, photodegradation, and Fenton-like reaction. Continuous production of O-2 center dot(-) and center dot OH radicles performs MB degradation and mineralization, confirmed by scavenging experiments and degradation product analysis. The local trap state Ti3+, Fe3O4, and N-carbon of the catalyst acted as active sites. It has suggested that the Ti3+ and N-doped dense carbon layer improve charge separation and shuttle that prolonged photo-Fenton like reaction. Moreover, the catalyst is highly stable, collectible, and recyclable up to 5 cycles with high MB degradation efficiency. This work provides a new insight into the synthesis of highly visible-light sensitized biochar-supported photocatalyst through NH3-ambiance pyrolysis of NPs-laden biomass. (c) 2018 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.

URI

https://hdl.handle.net/11511/89952

Journal

JOURNAL OF ENVIRONMENTAL SCIENCES

DOI

https://doi.org/10.1016/j.jes.2018.06.014

Collections

Department of Environmental Engineering, Article

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Citation Formats

M. M. Mian et al., “One-step synthesis of N-doped metal/biochar composite using NH3-ambiance pyrolysis for efficient degradation and mineralization of Methylene Blue,” JOURNAL OF ENVIRONMENTAL SCIENCES, pp. 29–41, 2019, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/89952.