EFFECTS OF Fe3O4 ON PREPARATION OF BIO-OIL AND DENITROGENATED BIOCHAR BY MICROALGAE LIQUEFACTION IN ETHANOL

Zhang Tao; Pan Haoxiang; Gao Huanting; Gong Xun

doi:10.19912/j.0254-0096.tynxb.2023-2101

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Acta Energiae Solaris Sinica ›› 2025, Vol. 46 ›› Issue (4) : 619-627. DOI: 10.19912/j.0254-0096.tynxb.2023-2101

EFFECTS OF Fe₃O₄ ON PREPARATION OF BIO-OIL AND DENITROGENATED BIOCHAR BY MICROALGAE LIQUEFACTION IN ETHANOL

Zhang Tao¹, Pan Haoxiang¹, Gao Huanting², Gong Xun²

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Abstract

The microalgae harvested by magnetic separation were liquefied in ethanol to prepare high-quality bio-oil, and the by-product Fe₃O₄-loaded nitrogen-enrich microalgae biochar was recovered and reused. The denitrification performance at low temperature （150 ℃） was tested, and potential pathways of denitrification were explored by in-situ DRIFTS. The results show that Fe₃O₄ promotes the decomposition of proteins in microalgae during the liquefaction process and increases the oil yiels. Meanwhile, the percentage of pyridine and pyrrole compounds in the biochar increases. The loading of Fe₃O₄ can effectively improve the denitrification efficiency of the biochar, which was the result of the synergistic effect of oxygen- and nitrogen-containing functional groups on the surface of algae-based biochar and Fe₃O₄ in the denitrification reaction.

Key words

microalgae / bio-oil / biomass / biomass char / denitrification / Fe₃O₄

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Zhang Tao, Pan Haoxiang, Gao Huanting, Gong Xun. EFFECTS OF Fe₃O₄ ON PREPARATION OF BIO-OIL AND DENITROGENATED BIOCHAR BY MICROALGAE LIQUEFACTION IN ETHANOL[J]. Acta Energiae Solaris Sinica. 2025, 46(4): 619-627 https://doi.org/10.19912/j.0254-0096.tynxb.2023-2101

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