Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu 611756, China.
College of Environmental Science and Engineering, Hunan University, Changsha 410082, China.
Bioresour Technol. 2021 Feb;322:124543. doi: 10.1016/j.biortech.2020.124543. Epub 2020 Dec 15.
The influence of persulfate assisted hydrothermal carbonization (HTC) (160 °C-220 °C) of spirulina and hydrochar properties was assessed. The elementary composition and proximate analysis of hydrochar were investigated on the carbonization degree and basic fuel properties, and the surface functional groups and morphological characteristics of hydrochar were analyzed as well as thermal stability. Results suggested that persulfate assisted process enhanced the carbonization degree of hydrochar by oxygen reduction (1.53%-2.74%) and increase of C ratio, and HHVs increased 0.81-1.39 MJ/kg at temperature above 180 °C. The -OH and CO on hydrochar surface were significantly reduced, and C-(C, H) and C-(O, N) were weakened by persulfate addition and more C-H peaks was formed. Additionally, the persulfate addition enhanced the thermal stability of hydrochar by lowing the maximum mass loss rate. The result suggested that HTC can be conducted with persulfate at lower temperature for hydrochar biofuel production.
评估了过硫酸盐辅助水热碳化（HTC）（160°C-220°C）对螺旋藻和水热炭性质的影响。通过碳化程度和基本燃料性质研究了水热炭的元素组成和近似分析，并分析了水热炭的表面官能团和形态特征以及热稳定性。结果表明，过硫酸盐辅助过程通过还原氧（1.53%-2.74%）和增加 C 比来提高水热炭的碳化程度，并且在温度高于 180°C 时 HHVs 增加了 0.81-1.39 MJ/kg。水热炭表面的-OH 和 CO 显著减少，过硫酸盐的添加减弱了 C-(C, H) 和 C-(O, N)，形成了更多的 C-H 峰。此外，过硫酸盐的添加通过降低最大质量损失率来提高水热炭的热稳定性。结果表明，过硫酸盐可以在较低温度下用于 HTC 以生产水热炭生物燃料。
