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Author: search.filters.author.Chaiwat, WeerawutSubject: search.filters.subject.Carbonization

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    Synthesis of nanoporous material from lignin via carbonization assisted acid activation
    (2020-01-01)
    Ngamthanacom, Nutchaporn
    ;
    Kaewtrakulchai, Napat
    ;
    Chaiwat, Weerawut
    ;
    Chuenchom, Laemthong
    ;
    Fuji, Masayoshi
    Waste lignin (WL) from the pulp mill and paper was studied for its potential application to prepare the nanoporous carbon with high porosity via carbonization assisted acid activation. The effect of acid activation such as HNO3, HCl, H2SO4, and H3PO4 on lignin transformation to nanoporous carbon investigated. The physicochemical properties of nanoporous carbon were comprehensively characterized through N2 sorption, Scanning electron microscope (SEM), X-ray diffraction (XRD), and Fourier transform infrared (FTIR), respectively. N2 sorption revealed that the condition using 5% vol of phosphoric acid activation at carbonization temperature of 700°C for 2 h exhibited the highly porous structure of carbon nanoparticles with a total pore volume of 0.035 cm<sup>3</sup> /g. With the properly selecting process variables of waste lignin development could be producing high porosity nanoporous carbon.
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    Influence of acid-treatment on waste lignin for synthesis of carbon nanoparticles
    (2019-01-01)
    Ngamthanacom, Nutchaporn
    ;
    Kaewtrakulchai, Napat
    ;
    Chaiwat, Weerawut
    ;
    Chuenchom, Laemthong
    ;
    Fuji, Masayoshi
    Waste lignin (WL) obtained from paper mills, was studied for its potential application in preparing carbon nanoparticles (CNPs) with high porosity. This was done by impregnation of 0, 5, 10 and 20% concentrations of phosphoric acid under various carbonization temperatures (600, 700, 800 and 900°C). The physicochemical properties of CNPs were characterized through nitrogen sorption, X-ray diffraction (XRD), Scanning electron microscopy (SEM), and Fourier transforms infrared spectroscopy (FTIR). Nitrogen sorption revealed that the condition using 10% concentration of phosphoric acid treatment at a carbonization temperature of 700°C formed carbon nanoparticles with a highly porous structure (Surface area 27.65 m<sup>2</sup> /g and pore volume 0.07 cm<sup>3</sup> /g). Additionally, in order to high surface area, porosity and concentrated carbon nanoparticle.