Slow Pyrolysis as a Promising Approach for Producing Biochar from Sunflower Straw

Yan Yue, Qimei Lin, Muhammad Irfan, Qun Chen, Xiaorong Zhao, Guitong Li


Slow pyrolysis opened new channels for the highly efficient utilization of sunflower straw in salt-affected regions and obtained not only 28% to 40% biochar, but also 29% to 44% syngas and 29% to 31% bio-oil. Biochar yield decreased with increasing temperature, whereas syngas increased and bio-oil changed minimally. Both syngas and bio-oil had potential value as fuel. The biochar produced at 700 °C had the highest pH, ash content, and water-soluble K+ of 11.9, 212 g/kg, and 23.9 g/kg, respectively, and the lowest atomic ratios for H/C and O/C of 0.19 and 0.10, respectively. However, C, other minerals, surface area, and cation exchange capacity (CEC) of biochar reached a stable level at 500 °C. Therefore, the differential characteristics of the biochar derived from sunflower straw might show potential value in removing pollutants and improving soil fertility at 500 °C.


Sunflower straw; Slow pyrolysis; Biochar; Syngas; Bio-oil

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