Hydrochars produced by hydrothermal carbonisation of seaweed, coconut shell and oak: effect of processing temperature on physicochemical adsorbent characteristics
Hydrochars produced by hydrothermal carbonisation of seaweed, coconut shell and oak: effect of processing temperature on physicochemical adsorbent characteristics
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DOI：
10.1007/s42452-022-05085-x
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发表时间：
2022-07
影响因子：
2.6
通讯作者：
E. Danso-Boateng;A. Ross;Ted Mariner;J. Hammerton;Melissa Fitzsimmons
中科院分区：
文献类型：
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作者：
E. Danso-Boateng;A. Ross;Ted Mariner;J. Hammerton;Melissa Fitzsimmons
本研究解决了生产氢焦从褐藻（墨角藻）（FS-HCs），椰子壳（CS-HCs），和橡树（Oak-HCs）作为潜在的吸附剂，使用水热碳化（HTC）。采用间歇式水热反应器研究了不同温度（200、220、250 °C）下热处理温度对氢焦物化吸附性能的影响。增加HTC温度会导致CS-HCs和Oak-HCs中形成许多球体，增加其孔隙率，但FS-HCs除外。氢焦的比表面积随着HTC温度的增加而增加; FS-HCs为10.93-12.78 m2/g，CS-HCs为2.18-21.94 m2/g，除了Oak-HCs从4.89 m2/g下降到3.09 m2/g。随着HTC温度的升高，氢焦中挥发分含量降低，固定碳含量增加，氢碳比（FS-HCs除外）和氧碳比降低。对于所有的氢焦，增加HTC温度的结果在zeta电位幅度略有下降，带负电荷的表面，使它们成为阳离子污染物的潜在吸附剂。该研究证实，HTC工艺与原始生物质相比改善了氢焦的关键化学和物理特性，并且随着处理温度的升高，物理化学吸附剂特性增强。
The present study addresses the production of hydrochars from brown seaweed (Fucus serratus) (FS-HCs), coconut shell (CS-HCs), and oak (Oak-HCs) as potential adsorbents using hydrothermal carbonisation (HTC). The effect of HTC processing temperature on the physicochemical adsorbent characteristics of the hydrochars is investigated at different temperatures (200, 220, 250 °C) using a hydrothermal batch reactor. Increasing HTC temperature causes the formation of many spheres in CS-HCs and Oak-HCs, increasing their porosity, except FS-HCs. The surface area of the hydrochars increases with increasing HTC temperature; 10.93–12.78 m2/g for FS-HCs, 2.18–21.94 m2/g for CS-HCs, except for Oak-HCs which decreases from 4.89 to 3.09 m2/g. Increasing HTC temperature decreases volatile matter content in the hydrochars, increases fixed carbon content, and decreases H/C ratio (except for FS-HCs) and O/C ratio of the hydrochars. For all the hydrochars, increasing the HTC temperature results in a slight decrease in zeta potential magnitude, with negatively charged surfaces, making them potential adsorbents for cationic pollutants. The study confirms that the HTC process improves key chemical and physical characteristics of the hydrochars compared to the original biomass, and that the physicochemical adsorbent characteristics are enhanced as the processing temperature increases.