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Author: search.filters.author.Faungnawakij, KajornsakSubject: search.filters.subject.Humic substance

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    Porous carbon adsorbent from humin derived from thai leonardite for methylene blue dye adsorption
    (2019-01-01)
    Sayjumpa, Jutaporn
    ;
    Jomhataikool, Buntita
    ;
    Faungnawakij, Kajornsak
    ;
    Kuboon, Sanchai
    ;
    Kraithong, Wasawat
    Leonardite is by-product from lignite mine found in northern Thailand. Leonardite is generally known as natural source of humic substances. Humic substances can be divided into three major fractions, i.e. humin, humic acids and fulvic acids. These fractions can be extracted by using solution adjusted to different acid alkaline (pH levels). Humin is a major product that can be extracted from Thai leonardite and it is over 80% yield of product. The morphology of humin is non-conductive bulk material with few porous structures. It can be used as adsorbent for dye adsorption or heavy metal and used as catalyst supporter. The synthesis of porous carbon from humin via carbonization process was investigated in this research. Humin was carbonized at different temperatures and characterized by SEM, FTIR, UV-Vis and BET. Porous carbon from humin was used in methylene blue dye adsorption. The result indicates that the particle size of humin was decreased with well-dispersed and non-agglomerate humin was observed in higher carbonization temperature. The adsorption capacity of humin was increased with increasing of temperature up to 700ºC and decreased at 900ºC according to surface area and porosity results. Although the carbon content of humin was increased at higher temperature, the function group used as adsorbent was decomposed.
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    Effect of humic acid extracted from Thailand's leonardite on rice growth
    (2019-01-01)
    Jomhataikool, Buntita
    ;
    Faungnawakij, Kajornsak
    ;
    Kuboon, Sanchai
    ;
    Kraithong, Wasawat
    ;
    Chutipaichit, Sutee
    Humic acid have been successfully extracted from leonardite using base-acid treatment. Humic acid is an essential part of soil. This material, present in good soil, makes available of uptake to the plant and the soil nutrients for improving the physical structure of the soil. To extract humic and fulvic acid, the Leonardite is processed in a strongly basic aqueous solution. To precipitate the humic acid, the solution is adjusted to pH 1 with a mineral acid. Carbon, Oxygen, Nitrogen, Aluminium, Silicon and Potassium were extracted from humic acid in humate form (Humic acid reacted with KOH). Rice grower have expressed interest about using humate as a soil fertilizer. This research, humic acid was used to amend soils to increase organic matter and application on rice berry growth. In addition, humic acid and leonardite was beneficial to leaf and root growth of rice berry compared with the control.