Hydrothermal Treatment of the Pristine and Contaminated Cd/Zn Hyperaccumulators for Bio-Oil Production and Heavy Metal Separation
文献类型： 外文期刊
第一作者： Cui, Xiaoqiang
作者： Cui, Xiaoqiang;Li, Xiangming;Zhang, Jianwei;Cheng, Zhanjun;Yan, Beibei;Chen, Guanyi;Lin, Qiang;Yang, Xiaoe;Xiao, Hui;Chen, Guanyi
作者机构：
关键词： hydrothermal liquefaction; phytoremediation; hyperaccumulator; heavy metal; biocrude
期刊名称：ACS SUSTAINABLE CHEMISTRY & ENGINEERING （ 影响因子：9.224； 五年影响因子：9.458 ）
ISSN： 2168-0485
年卷期： 2022 年 10 卷 1 期
页码：
收录情况： SCI
摘要： Hydrothermal conversion is a promising technology to dispose of biomass wastes. To achieve the harmless treatment of heavy metal (HM) hyperaccumulators and production of bio-oil, hydrothermal conversion of two types of Sedum alfredii [i.e., uncontaminated S. alfredii (SAL) and the harvested S. alfredii after phytoremediation (SAH)] at 210-300 degrees C was conducted in this study. Only 0.53-1.59% of Cd and 0.34-5.94% of Zn in SAH migrated to bio-oils, which were much lower than those in hydrochar and the aqueous products. High hydrothermal conversion temperature promoted the bio-oil yield, and the S. alfredii-derived bio-oils showed considerable higher heating values (32.07-33.83 MJ/kg). The main components of bio-oils were aliphatic hydrocarbons, followed by oxygen-containing compounds (e.g., alcohols, phenols, and ketones/aldehydes) and nitrogen-containing compounds. The bio-oils derived from SAL contained a higher content of aliphatic hydrocarbons (56.39-60.11%) and N-containing compounds (9.03-15.17%), while the SAH-derived bio-oils had more ketones/aldehydes (15.17-19.79%), which could be ascribed to the component difference of feedstocks and the catalytic effect of Zn. Moreover, the distillable fraction (boiling point <538 degrees C) in the bio-oils was up to 79.89-86.90%. These results suggest that hydrothermal conversion of S. alfredii could be a promising technique for the HM separation and value-added bio-oil production.
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