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| Stability and carbon sequestration potential of hydrochar derived from Cyperus alternifolius |
| Received:June 25, 2021 |
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| KeyWord:Cyperus alternifolius;hydrochar;stability;carbon sequestration |
| Author Name | Affiliation | E-mail | | WANG Yuting | School of Environmental Science and Engineering, Tianjin University, Tianjin 300372, China | | | CHEN Guanyi | School of Environmental Science and Engineering, Tianjin University, Tianjin 300372, China
School of Mechanical Engineering, Tianjin University of Commerce, Tianjin 300134, China
School of Science, Tibet University, Lhasa 850012, China | | | LI Lei | School of Environmental Science and Engineering, Tianjin University, Tianjin 300372, China | | | CUI Xiaoqiang | School of Environmental Science and Engineering, Tianjin University, Tianjin 300372, China | cuixiaoqiang@tju.edu.cn |
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| Abstract: |
| To explore the stability and carbon sequestration potential of hydrochar from wetland plants, hydrochars were prepared from Cyperus alternifolius L(.CA) at 200, 220, 240℃, and 260℃. Elemental analysis, Fourier transform infrared spectroscopy(FTIR), X-ray Diffraction(XRD), Thermogravimetric analysis(TG), and chemical oxidation were employed to explore the physicochemical properties and thermal and chemical stability of hydrochar and to further evaluate the carbon sequestration potential of hydrochar at different temperatures. The results showed that as the hydrothermal carbonization temperature increased, the yield of hydrochar decreased, the pH value and ash content increased, the H/C and O/C ratios decreased, the labile oxygen-containing functional groups such as -OH and -C-O decreased, and the aromatization degree increased. The results of the Thermogravimetric analysis and stability coefficient(R50) showed that the R50 value of hydrochars prepared at different temperatures ranged from 0.47 to 0.59. The H2O2 oxidation trial showed that the hydrochar prepared at a medium-low temperature of 220℃ had the best oxidation resistance, with a stable carbon content of 54.14% after oxidation. In addition, the analysis results of the carbon sequestration potential showed that with increased carbonization temperature, the carbon sequestration coefficient of the hydrochar derived from CA fluctuated in the range of 30.21%~31.54%, and the CO2 equivalent of the long-term carbon sequestration potential ranged from 2.76 Mt·a-1 to 2.88 Mt·a-1. The study showed that the medium-low temperature hydrochars prepared at 200℃ and 220℃ had good chemical stability and advantages in the short-term carbon sequestration effect, whereas the high-temperature hydrochar prepared at 260℃ had the best thermal stability and long-term carbon sequestration potential, and good prospects for carbon sequestration and emission reduction. |
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