Abstract:
The objective of this research was to study the properties of durian shells biochars prepared
by the pyrolysis process. The durian shells were contained in a closed chamber and heated
in an electric furnace at diff erent temperatures which varied from 500 oC to 900 oC for 10 hours.
After heating, durian shells turned into black color. Density and porosity, surface morphology,
elemental compositions, and crystalline phases of biochars were investigated by Archimedes
immersion technique, scanning electron microscope (SEM), Energy dispersive x-ray
spectrometry (EDX) and X-ray diff ractometer (XRD), respectively. An increase in pyrolysis
temperature led to yield reduction and an increase in the bulk density of biochars. SEM analysis
showed the distribution of pore on all biochars fractures with similar apparent porosity values
of more than 70%. The main elements in all biochars contained carbon (C) and oxygen (O),
which were studied by EDX analysis. XRD results showed phase formation of carbon in
biochar, which could form both amorphous and semi-crystalline phases. While oxygen could be
composed in other elements in biomass through many forms of mineralogical compositions
as CaCO3 (Calcite), KHCO3 (kalicinite), and Ca3(PO4)2. Moreover, the alkali lignin phase
appears in biochar at 500 oC and 600 oC conditions because of a highly cross-linked structure
of the lignin. The CaCO3 and Ca3(PO4)2 phases could decompose at low pyrolysis temperature,
but KHCO3 phase formed at high temperatures hence the thermal stability of the KHCO3
phase was higher than CaCO3 and Ca3(PO4)2 phases.
Address:
NAKHON RATCHASIMA
Email:
kitiya.ni@rmuti.ac.th
Created:
2563
Modified:
2025-09-11
Issued:
2566-02-25
บทความ/Article
application/pdf
ISBN:
26729369 (Online)
BibliograpyCitation :
RMUTI JOURNAL Science and Technology Vol. 13, No. 3, September - December 2020