Reviewing the effect of pyrolysis temperature on the fourier-transform infrared spectra of biochars
Reviewing the effect of pyrolysis temperature on the fourier-transform infrared spectra of biochars
PDFAuthors: Narges Hemati Matin and Elena Aydin
Volume/Issue: Volume 25: Issue 2
Published online: 01 Nov 2022
Pages: 160 - 173
Abstract
Pyrolysis of feedstocks to produce biochar for soil remediation employed to be a convenient method regarding improvement of soil fertility, increasing carbon stability and decreasing greenhouse gas emissions. Biochar properties and its eff ect after incorporation into the soils vary depending on the characteristics of feedstocks and pyrolysis process. This paper aims to compare the eff ect of pyrolysis temperature on the frequency of functional groups in diff erent biochars made from plant feedstocks over the temperature range from 300 °C to 700 °C. An increase in pyrolysis temperature positively aff ects biochar surface properties until the deformation step in C = O, –COOH, and OH groups and as a result, the surface area of biochar decreases at high temperature (more than 600 °C). The breakdown of hemicellulose, cellulose, and lignin also occurs at temperatures more than 600 °C. Consequently, the biochar quality is reduced with increasing pyrolysis temperature although such biochar may be suitable for rising the content of stable carbon in the soils. Over the long-term, the stability of biochar can contribute to carbon sequestration, retention of water and ions in the soil.
Keywords: pyrolysis temperature, carbonization, degradation, functional groups
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