Evolution and correlation of the physiochemical properties of bamboo char under successive pyrolysis process

Abstract

This study investigated the effects of bamboo age, bamboo parts, and pyrolysis temperatures on the physiochemical properties of bamboo char throughout a series of pyrolysis processes spanning from 150 °C to 1000 °C. The results indicated that as the pyrolysis temperature increased from 150 °C to 500 °C, the yield of bamboo char experienced a rapid decline, settling at a maximum of 69%, with no significant impact from bamboo age and parts. Subsequently, as the pyrolysis temperature continued to rise from 500 °C to 1000 °C, the yield stabilized at 25.74–32.64%. Besides, fixed carbon (FC), volatile matter (VM), and ash content were temperature-dependent, while the H/C, O/C, (N + O)/C, and aromatic index kept constant after reaching 500 °C. Notably, 800 °C was confirmed to be a crucial turning point for physiochemical properties, at which the graphitic structural changes occurred, pore collapsed, and potassium salts released. Bamboo age was proved to enhance the stability. Pearson correlation coefficient (PCC) analysis revealed that the pyrolysis temperature was positively correlated (p < 0.01) with ash (0.76), FC (0.97), AI (0.81), R₅₀ (0.77), and C–C/C = C/C–H (0.87). Conversely, negative correlations (p < 0.01) were observed with VM (−0.91), O/C (0.88), H/C (−0.95), (N + O)/C (−0.87), C loss (−0.79), and labile organic-C (−0.78). Additionally, bamboo age was negatively correlated (p < 0.01) with C loss (−0.40), volatile organic-C (−0.63), labile organic-C (−0.45), and recalcitrant organic-C (−0.40), but positively associated with R₅₀ (0.54), refractory organic-C (0.42), and inorganic-C (0.52). Bamboo parts did not exhibit significant correlations with char properties.

Highlights

•	500 °C and 800 °C served as key turning points for the properties of biochar.
•	Bamboo age had a positive effect on thermal stability and chemical stability.
•	There was no significant difference in properties between different parts (internodes and nodes) of bamboo.

Keywords

Bamboo char / Temperature / Physicochemical properties / Evolution / Correlation

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Funding

National Key Research and Development Program of China(2022YFD2200904); Fundamental Research Funds of ICBR(1632020013)