Welcome to Chinese Journal of Tropical Crops,

Chinese Journal of Tropical Crops ›› 2020, Vol. 41 ›› Issue (7): 1498-1504.DOI: 10.3969/j.issn.1000-2561.2020.07.029

• Agricultural Ecology & Environmental Protection • Previous Articles    

Characteristics of Biochar Prepared from Hainan Typical Feedstocks in Different Temperatures

ZOU Ganghua,DAI Minjie,ZHAO Fengliang(),SHAN Ying   

  1. Hainan Key Laboratory of Tropical Eco-Circular Agriculture / Environment and Plant Protection Institute, Chinese Academy of Tropical Agricultural Sciences, Haikou, Hainan 571101
  • Received:2019-08-02 Revised:2019-10-29 Online:2020-07-25 Published:2020-08-24
  • Contact: ZHAO Fengliang


Material and pyrolysis temperature have important effects on the properties of biochar. Nine typical feedstocks (e.g., coconut shell, banana stem, rubber branch and so on) in Hainan were selected to analyze the properties of the biochar prepared at different temperatures (300, 500 and 700 ℃), as well as the internal correlation. pH, C/H ratio, specific surface area (SSA), and P of the biochar increased as the pyrolysis temperature increased, whereas the yield, hydrogen and sulfur content decreased. Carbon or nitrogen content, electrical conductivity (EC), K, Ca and Mg content, and cation exchange capacity (CEC) of biochar presented different change with the increase of temperature due to varied raw materials. The content of heavy metals in the biochar was not beyond the concentration limited in standards. Carbon content, C/N ratio and P, K, Ca and Mg content in the biochar were all positively correlated with that in raw material (P<0.05). Potassium content in feedstocks had significant effects on pH, EC and CEC of biochar. Considering the properties of yield, carbon content, SSA, CEC and mineral elements, the biochars from mushroom residue, coconut shell and banana pseudostem were better. This conclusion would be helpful for feedstock selection for the biochar production in tropical areas.

Key words: feedstock, temperature, tropical area, biochar, property

CLC Number: