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One-step synthesis of N-doped metal/biochar composite using NH_3-ambiance pyrolysis for efficient degradation and mineralization of Methylene Blue

引用

Journal of Environmental Sciences 2019年第4期31卷 29-41页

作者： Md Manik Mian Guijian Liu Balal Yousaf Biao Fu Rafay Ahmed Qumber Abbas Mehr Ahmed Mujtaba Munir Liu Ruijia CAS Key Laboratory of Crust-Mantle Materials and the Environments School of Earth and Space SciencesUniversity of Science and Technology of China State Key Laboratory of Loess and Quaternary Geology Institute of Earth EnvironmentChinese Academy of Sciences

A series of new biochar-supported composite based on the combination of biochar and metallic nanoparticles(NPs)were produced through single-step pyrolysis of FeCl_3–Ti(OBu)_4 laden agar biomass under NH_3 *** physiochemical properties of composites were characterized *** has found that heating temperature and N-doping through NH_3-ambiance pyrolysis significantly influence the visible-light sensitivity and bandgap energy of *** catalytic activities of composites were measured by degradation of Methylene Blue(MB)in the presence or absence of H_2O_2 and visible-light *** best catalyst(N–TiO_2–Fe_3O_4-biochar)exhibits rapid and high MB removal competency(99.99%)via synergism of adsorption,photodegradation,and Fenton-like *** production of O_2U^-and UOH radicles performs MB degradation and mineralization,confirmed by scavenging experiments and degradation product *** local trap state Ti^(3+),Fe_3O_4,and N-carbon of the catalyst acted as active *** has suggested that the Ti^(3+)and N-doped dense carbon layer improve charge separation and shuttle that prolonged photo-Fenton like ***,the catalyst is highly stable,collectible,and recyclable up to 5 cycles with high MB degradation *** work provides a new insight into the synthesis of highly visible-light sensitized biocharsupported photocatalyst through NH_3-ambiance pyrolysis of NPs-laden biomass.

关键词： biochar-supported photocatalyst N–TiO2–Fe3O4-biochar NH3-ambiance pyrolysis Methylene Blue Photocatalysis

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