Microalgae are considered as a promising alternative to fossil fuels due to their ease of cultivation, short growth cycle and no occupation of cultivated land. In this study, N,N-Dimethylformamide (DMF) solvent was employed to assist hydrothermal pretreatment of Chlorella for coproduction of sugar, nitrogenous compounds and carbon dots (CDs). The effect of pretreatment conditions on the composition and pyrolysis bio-oil distribution of hydrothermal solid residues as well as CDs characteristic were investigated by varying the temperature (180–220 ℃) and reaction time (1–9 h). The results showed that pretreated residues had higher cellulose. And the yield of sugar and N-contained compounds reached 41.59% and 63.57% in the pyrolysis bio-oil of pretreated algae residues, respectively. Moreover, CDs obtained from hydrothermal solution fluoresced red under 365 nm excitation. The paper provides a new method for the complete utilization of microalgae.

由于微藻易于栽培、生长周期短且不占用耕地，微藻被认为是化石燃料的有前途的替代品。在本研究中，N,N-二甲基甲酰胺 (DMF) 溶剂用于辅助小球藻的水热预处理用于联合生产糖、含氮化合物和碳点 (CD)。通过改变温度（180-220 ℃）和反应时间（1-9 h）研究了预处理条件对水热固体残渣的组成和热解生物油分布以及CDs特性的影响。结果表明，预处理的残留物具有较高的纤维素。经预处理的藻渣热解生物油中糖和含氮化合物的产率分别达到41.59%和63.57%。此外，从水热溶液中获得的 CD 在 365 nm 激发下发出红色荧光。该论文为微藻的全面利用提供了一种新方法。