Bamboo biochar-catalytic degradation of lignin under microwave heating

Abstract

Lignin biochar-catalytic depolymerization using biochar Fe-600, Fe-800, Ni-600, Ni-800 catalysts under microwave-heating (180 °C for 30 min) was explored in an ethanol/formic acid (1:1) media. Non-catalyst depolymerization was also studied and compared with the biochar-catalysts results. Characteristics of the bio-char catalysts were analyze by BET, XRD, and FT-IR. GPC, FT-IR, and MALDI-TOF MS spectrometry were also used to characterize the depolymerization products. The experimental results showed that the S_BET, V_t, and V_mec and average pore diameter of the biochars are considerably dependent on the preparation temperature and type of cation (Ni²⁺ or Fe³⁺). The maximum yield of bio-oil product was obtained as 85 wt% with the addition of biochar Ni-600 and the total amount of oligomers or monomers with a molecular weight of 164 to 446 reaches 80.4%.

Keywords:

• Bamboo Organosolv lignin
• bamboo biochar-catalyzed depolymerization
• microwave-assisted depolymerization
• MALDI-TOF MS

Additional information

Funding

This study was supported by the Research Project of State Key Laboratory of Food Science and Technology Nanchang University (Project No. SKLF-ZZB-201722); Key project of Jiangxi Provincial Department of Science and Technology Jiangxi (20161BBF60057); the National Natural Science Foundation of China (21466022), (21878137) and (21766019); and Natural Science Foundation of Jiangxi Province (20181BAB206030).