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http://dx.doi.org/10.17137/korrae.2022.30.3.13

Removal Properties of Methylene Blue using Biochar Prepared from Street Tree Pruning Branches and Household Wood Waste  

Do, Ji-Young (Department of Environmental Engineering, Kwangwoon University)
Kim, Dong-Su (Department of Environmental Engineering, Kwangwoon University)
Park, Kyung-Chul (Department of Environmental Engineering, Kwangwoon University)
Park, Sam-Bae (Department of Environmental Engineering, Kwangwoon University)
Chang, Yoon-Young (Department of Environmental Engineering, Kwangwoon University)
Yang, Jae-Kyu (Department of Environmental Engineering, Kwangwoon University)
Publication Information
Journal of the Korea Organic Resources Recycling Association / v.30, no.3, 2022 , pp. 13-22 More about this Journal
Abstract
In order to improve water quality of the water system contaminated with dyes, biochars prepared using discarded waste resources were applied in this study. Biochars with a large specific surface area were manufactured using street tree pruning products or waste wood, and were applied to remove an organic dye in synthetic water. Biochars were made by pyrolysis of typical street tree porch products (Platanas, Ginkgo, Aak) and waste wood under air-controlled conditions. Methylene blue (MB), which is widely used in phosphofibers, paper, leather, and cotton media, was selected in this study. The adsorption capacity of Platanas for MB was the highest and the qmax value obtained using the Langmuir model equation was 78.47 mg/g. In addition, the adsorption energy (E) (kJ/mol) of MB using the Dubinin-Radushkevich (D-R) model equation was 4.891 kJ/mol which was less than 8 kJ/mol (a criteria distinguishing physical adsorption from chemical adsorption). This result suggests a physical adsorption with weak interactions such as van der Waals force between the biochar and MB. In addition, the physical adsorption may resulted from that Platanas-based biohar has the largest specific surface area and pore volume. The ∆G value obtained through the adsorption experiment according to temperature variation was -3.67 to -7.68, which also suggests a physical adsorption. Considering these adsorption results, the adsorption of MB onto Platanas-based biochar seems to occur through physical adsorption. Overall, it was possible to suggest that adsorption capacity of the biochr prepared from this study was equal to or greater than that of commercial activated carbon reported in other studies.
Keywords
Adsorption; Biochar; Methylene blue; Pyrolysis;
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Times Cited By KSCI : 1  (Citation Analysis)
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