Characteristics of the surface chemistry of linden pyrochar after removal of labile organic matter

3rd International Conference Environment and Sustainable Development of Territories: Ecological Challenges of the 21st Century

生态环境科学;地球科学;经济学

Valeeva, A.A.^1 ; Smirnova, E.V.^1 ; Giniyatullin, K.G.^1 ; Vorobev, V.V.^2 ; Biktasheva, L.R.^1 ; Grachev, A.N.^3

Institute of Environmental Sciences, Kazan Federal University, Kremlevskaya str., 18, Kazan

420008, Russia^1

Interdisciplinary Centre of Analytical Microscopy, Kazan Federal University, Kazan

420008, Russia^2

Kazan National Research Technological University, K. Marksa Str. 68, Kazan

420015, Russia^3

关键词: Labile organic matter;    Laboratory experiments;    Low-temperature pyrolysis;    Organic substances;    Organosilicon polymers;    Phenolic surfaces;    Stretching vibrations;    Tertiary alcohols;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/107/1/012124/pdf
DOI  :  10.1088/1755-1315/107/1/012124

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

The changes of chemical properties of the pyrochar surface were studied in the laboratory experiment that simulated pedogenic transformation of pyrochar under the influence of soil biota. The native pyrochar samples were obtained by pyrolysis of linden wood residues at the temperature of 250°C, 450°C and 650°C. Their modified samples were obtained by removing an easily degradable pool of organic substances that can be used by microorganisms during the first months after application to the soil. In low-temperature linden pyrochar (250°C and 450°C) dominated carboxylic and phenolic surface groups, in high-temperature (650°C) - lactonic groups. After removal of readily decomposable organic substances the acidity of the phenolic and lactonic groups in pyrochar of low-temperature pyrolysis sharply decreased. Characteristic feature of all studied samples is the presence in IR spectra of absorption bands of gyroxyl, carbonyl, methylene groups and organosilicon polymers. The feature of IR spectra of linden pyrochar (250°C and 450°C) is the presence of absorption bands of the stretching vibrations of the tertiary alcohols and phenols C-O group.