中文摘要：

以典型砷超富集植物——蜈蚣草茎叶收获物为研究对象,开展了水热液化后处理及粗生物油改性实验研究。在粒度75μm、液固比6.7∶1、温度380℃、压强25 MPa条件下,对蜈蚣草进行水热液化后处理后,蜈蚣草茎叶中91.51%以上的重金属进入水溶液,68.56%的生物质转化为粗生物油。经GC-MS检测,粗生物油中有机物成分主要为苯环类23.79%、烷烃类13.96%、酯类20.75%、醇类3.10%、酮类25.11%、烯烃类7.19%;以正十二烷为溶剂,在温度150℃、时间2 h、氢压1.0 MPa以及钯碳催化剂5%的条件下对粗生物油进行催化加氢改性,得到的改性生物油含苯环类1.17%、烷烃类87.75%、酯类1.26%、醛酮类2.70%、烯烃类2.71%。经改性后,粗生物油中苯环类有机物大幅降低,烷烃类有机物大幅增长,热值由38.86 MJ·kg^-1提高到46.85 MJ·kg^-1,有利于生物油的能源化利用。

英文摘要：

This study attempted to separate toxical metals and yield crude bio-oil from the stems and leaves of Pteris vittata,which is an arsenic hyperaccumulator,using a hydrothermal upgrading process. Under the conditions of 75 μm granularity,liquid-solid ratio of 6. 7 ∶ 1,25 MPa pressure,and temperature of 380 ℃,more than 91. 51% of the main heavy metals were separated into an aqueous solution,and 68. 56% of the biomass was converted into crude bio-oil. GC-MS analysis results showed that the organic components of the bio-oil in the cyclohexane phase mainly consisted of 23. 79% benzodiazepines,13. 96% alkane,20. 75% esters,3. 10% alcohols,25. 11% ketones,and 7. 19% olefin. The crude bio-oil was then subjected to catalytic hydrogenation modification under the following conditions： solvent,dodecanoic,temperature of 150 ℃,duration of 2 h,hydrogen pressure of1. 0 MPa and carbon palladium catalyst（ Pt 5%） of 0. 5 g. The concentration of the benzodiazepine components were decreased,while the concentration of alkane components increased drastically. The resultant modified biooil was composed of 1. 17%,87. 75%,1. 26%,2. 70%,and 2. 71% benzodiazepines,alkane,esters,ketones,and olefins,respectively. The calorific value increased from 38. 86 MJ ·kg^-1to 46. 85 MJ·kg^-1,which would be beneficial for the energy utilization of heavy metals in the hyperaccumulator harvest.