The effect of extraction of labile organic fractions on surface properties of pyrochars

International Scientific Conference «AGRITECH-2019: Agribusiness, Environmental Engineering and Biotechnologies»

农业科学;生态环境科学;生物科学

Smirnova, E.V.^1 ; Giniyatullin, K.G.^1 ; Okunev, R.V.^1 ; Guseva, I.A.^1 ; Gordeeva, K.A.^1

Institute of Environmental Sciences, Kazan Federal University, Kremlevskaya str., 18, 420008, Russia^1

关键词: Cation exchange capacities;    Isothermal conditions;    Organic fractions;    Pyrolysis temperature;    Qualitative characteristics;    Qualitative compositions;    Soluble organic matters;    UV-Vis spectrometry;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/315/4/042009/pdf
DOI  :  10.1088/1755-1315/315/4/042009

来源: IOP

【 摘 要 】

The changes in the properties of pyrochars and the possibility of their use as soil meliorants were evaluated. Pyrochars obtained from linden residues at fixed pyrolysis temperatures of 250°C, 450°C and 650°C and under isothermal conditions in the temperature range from 450°C to 650°C have been studied. Their labile fractions of organic matter extracted with Na4P2O7-NaOH solution and hot water was investigated by UV-VIS spectrometry and after extraction cation exchange capacity of pyrochars was characterized. For the qualitative characteristics of the selected fractions, ratio of the absorption of a colored solution of organic matter at λ = 254 nm to the content of organic carbon was calculated. It was concluded, that the pool of water-soluble and alkaline-soluble organic matter of pyrochars is a mixture of organic compounds of uncertain qualitative composition, whose properties are determined by the pyrolysis temperature. Extraction of this water-soluble and alkaline-soluble organic matter leads to a change in cation exchange capacity of pyrochars.