CHEMICAL AND STRUCTURAL CHARACTERISTICS AND SORPTION PROPERTIES BIOCHAR FROM WASTE COFFEE GROUNDS
DOI:
https://doi.org/10.15421/jchemtech.v33i1.316519Keywords:
waste coffee sludge; biochar; sorption properties; environmental protection technologiesAbstract
The processing of waste coffee grounds is a global problem, and its transformation into a target secondary product is an urgent and promising task. The aim of the study is to produce biochar that can be used in the process of anaerobic digestion of food waste from a hotel and restaurant complex to produce biogas and to determine its sorption characteristics. The chemical composition of the raw materials and biochar obtained by pyrolysis and microwave irradiation showed that the proportion of lignin and ash increases with increasing temperature. Studies of the interaction of lead ions with plant material and its modified forms show that sorption by biochar is much higher than by raw materials, probably due to differences in chemical composition, surface properties, etc. Comparison of the data on the sorption of lead ions by modified forms (biochar) allows us to conclude that the method of preparation has a significant effect on the sorption value. The pyrolysis temperature of the biochar has a favourable effect on the sorption properties of the samples. The obtained adsorption isotherms are of the L-type. The maximum sorption values are observed under the experimental conditions at an initial concentration of lead ions of 1.00 mg/ml. The study of the kinetic parameters of the processes of lead ion sorption by biochar preparations based on the curve of residual lead ion concentrations shows that equilibrium in the system is achieved in a few hours. The maximum sorption values are observed after 2.5-3 hours of incubation.
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