Citation: Yang ZHOU, Lili YAN, Wenjuan ZHANG, Pinhua RAO. Thermal regeneration of biogas residue biochar and the ammonia nitrogen adsorption properties[J]. Chinese Journal of Inorganic Chemistry, ;2025, 41(8): 1574-1588. doi: 10.11862/CJIC.20250032 shu

Thermal regeneration of biogas residue biochar and the ammonia nitrogen adsorption properties

School of Chemistry and Chemical Engineering, Shanghai University of Engineering and Technology, Shanghai 201620, China

Corresponding author: Pinhua RAO, raopinhua@sues.edu.cn
Received Date: 26 January 2025
Revised Date: 23 June 2025

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Based on the study of the characteristics and mechanism of ammonia nitrogen (NH₄⁺) adsorption by biogas residue biochar, we focused on the thermal regeneration of saturated biogas residue biochar, and investigated the influence mechanism of thermal regeneration parameters (regeneration temperature, regeneration time, heating rate, protective gas, and gas flow rate) on the adsorption performance of biochar. The adsorption capacity of NH₄⁺ by biogas residue biochar could reach 19.12 mg·g^-1, which was in line with the Langmuir model. The adsorption mechanism was mainly surface coordination and ion exchange reaction. Optimal hot regeneration parameters were as fllowed: the temprepure was 200 ℃, the protective gas was N₂, the flow rate was 0.5 L·min^-1, and the regeneration was carried out at a heating rate of 5 ℃ ·min^-1 for 1 h. The initial adsorption and regeneration rate was 99.59%. After 10 adsorption-regeneration cycles, the adsorption and regeneration rate still reached 89.55%, and the weight loss rate was less than 5%. Characterization was carried out through various technical means such as thermogravi-metric infrared spectroscopy (TG-IR), Fourier transform infrared (FTIR) spectroscopy, X-ray photoelectron spectroscopy (XPS), specific surface area and porosity analysis, and scanning electron microscopy (SEM). The results showed that multiple cycles of thermal regeneration could destroy the oxygen-containing functional groups such as C=O, —OH, and —COOH on the surface of saturated biochar. Meanwhile, some adsorption sites were permanently occupied, resulting in a gradual decrease in the adsorption regeneration rate. Hot regeneration could achieve the thermal desorption of the vast majority of ammonia nitrogen in saturated biochar, effectively restoring the pore structure and adsorption sites of oxygen-containing functional groups on the surface of biochar.
- biogas residue,
- biochar,
- thermal regeneration,
- ammonia nitrogen
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