Contribution of pyrolytic gas medium to the fabrication of co-impregnated biochar
作者： Dong-Wan Cho , Sohyun Kim , Daniel C.W. Tsang , Nanthi S. Bolan , Taejin Kim
DOI: 10.1016/J.JCOU.2018.06.003
关键词:
摘要: Abstract Co-impregnated biochars were fabricated by pyrolysis of spent coffee grounds (SCG) or glucose as carbon (C) sources under N2 and CO2. The formed biochar samples characterized with FE-SEM, TEM/EDS, XRD, TGA, Raman, XPS, BET, further used catalytic medium for the reduction p-nitrophenol in presence NaBH4. physicochemical characteristics significantly changed types C precursor flow gas stream. from SCG stream showed good dispersion Co nanoparticles (10–20 nm) matrix compared to that produced CO2 stream, but BET surface area was very small (4.5 m2 g−1) due pore blockage thermal degradation products. SCG-derived possessed highly porous structure CO2-assisted volatilization. In contrast, glucose-derived biochar, significant porosity occurred excess devolatilization conditions, while biochar. These contrasting results demonstrated significance crystallinity degradability precursors. performance better correlated external rather than microporosity.
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