Influence of pyrolysis temperature on the physicochemical properties of biochars obtained from herbaceous and woody plants

Abstract

This work aimed to investigate the effect of pyrolysis temperature on the yield and properties of biochars synthesized from herbaceous and woody plants. Four typical materials, including two herbaceous plants (rice straw, corn straw) and two woody plants (camellia oleifera shells, garden waste), were used in the experiments under five operating temperatures (from 300 °C to 700 °C, with an interval of 100 °C). The results showed biochar derived from herbaceous plants had a significantly higher pH (from 7.68 to 11.29 for RS), electrical conductivity (EC, from 6.5 Ms cm⁻¹ to 13.2 mS cm⁻¹ for RS), cation exchange conductivity (CEC, from 27.81 cmol kg⁻¹ to 21.69 cmol kg⁻¹ for RS), and ash content (from 21.79% to 32.71% for RS) than the biochar from woody plants, but the volatile matter (VM, from 42.23% to 11.77% for OT) and specific surface area (BET, from 2.88 m² g⁻¹ to 301.67 m² g⁻¹ for OT) in the woody plant-derived biochar were higher. Except for CEC and VM, all the previously referred physicochemical characteristics in the as-prepared biochars increased with the increasing pyrolysis temperature, the H/C and O/C values of herbaceous and woody plant-derived biochar were lower than 0.9 and 0.3, respectively, confirming their potential as the material for carbon sequestration. The results revealed that biochar made from herbaceous plants was more suitable for acidic soil amendments. In contrast, woody plant-derived biochar were recommended to remove heavy metals in environmental remediation and water treatment.

Keywords

Biochar / Pyrolysis temperature / Herbaceous plants / Woody plants

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Funding

Basic and Applied Basic Research Foundation of Guangdong Province(2022A1515010941)

Science and technology plan projects of Guangzhou(202206010069)

Meizhou Science and Technology Project(2021A0304001)

Key-Area Research and Development Program of Guangdong Province(2020B020215003)