THERMAL ANALYSIS AND IR SPECTROSCOPY OF COFFFEE GROUNDS AND COFFEE-GROUND-DERIVED BIOCHARS
DOI:
https://doi.org/10.15421/jchemtech.v34i2.353798Keywords:
complex thermal analysis, spent coffee grounds, biochar, physical and chemical properties, infrared spectroscopy, surface structure characteristicsAbstract
The worsening environmental, food and energy crisis necessitates new approaches to recycling food waste into targeted products, one of which is coffee grounds. The produced biochars, featuring a high specific surface area and suitable pore dimensions, are considered relevant and promising for addressing environmental challenges in the waste management sector. The aim of the objective of this research is to produce biochar, which can be used efficiently and effectively in the future during the process of anaerobic digestion of food waste from a hotel and restaurant complex to produce biogas, to study its structural surface characteristics and its physicochemical characteristics using integral and differential infrared spectroscopy and complex thermal analysis. The differential infrared spectrum of the comparison of biochar and feedstocks is characterised by a decrease in the absorption intensity of the feedstock in the 3400 cm-1 region, which corresponds to the valence vibrations of the free OH- group, indicating an increase in hydrogen bonds in biochar. To evaluate the effect of temperature on the thermal decomposition of the samples, a comprehensive thermal analysis was used, including differential thermogravimetry (DTG), thermogravimetric analysis (ТG) and differential thermal (DТА) analyses. Тhe less intense mass loss of biochar-300 and biochar-500 samples compared to the samples of the feedstock and biochar-MX confirms the presence of fewer thermally unstable components in them. Compared to the raw material sample, the samples of all the studied biochars contain fewer components capable of thermal oxidation. Structural characteristics of the biochar surface have a significant impact on the functional properties of biochar, the specific surface of biochar is much higher than the specific surface of raw materials, which indicates the feasibility of the selected methods of modifying raw materials to increase their functional properties.
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