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Subject: search.filters.subject.Pb(II) adsorption

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    One-Step Synthesis of Magnetic Biochar from Durian Shell Via K2FeO4 Activation for Lead Removal
    (2024-01-01)
    Pewpa, Orrawan
    ;
    Limmun, Warunee
    ;
    Ito, Ayumi
    ;
    Chungcharoen, Thatchapol
    This study explores the synthesis and application of magnetic biochar derived from durian shell (MDS) for Pb(II) removal. MDS was synthesized through a one-step method using K<inf>2</inf>FeO<inf>4</inf> activation. The synthesized MDS was characterized using various analytical techniques, showing a high specific surface area and oxygen-rich functional groups. These characteristics have made it highly effective at adsorbing Pb(II). The initial pH and MDS dosage effects on Pb(II) adsorption were examined. The highest adsorption capacity of MDS for Pb(II) was found to be 87.43 mg/g, which was observed at pH 7 and MDS dosage of 1 g/L. The pseudo-second-order (PSO) model was found to be the best fit for the kinetics of Pb(II) adsorption, suggesting chemisorption. These results are expected to contribute to the development of effective, economical, and environmentally friendly solutions for wastewater treatment, mainly targeting Pb(II) contamination.
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    Characterization and Application of Biochar Derived from Snake Fruit Peel for Lead Adsorption
    (2024-01-01)
    Maneesri, Wisit
    ;
    Choolaaied, Orasa
    ;
    Phanchindawan, Naree
    ;
    Ketpimol, Nopadol
    ;
    Limmun, Warunee
    Lead (Pb(II)) is a prominent contaminant in industrial wastewater, causing environmental and health risks. Traditional treatment methods often encounter limitations, including high operational costs and low efficiency in dilute solutions. This study presents an innovative, cost-effective solution utilizing biochar derived from snake fruit peels. Two biochar materials, SB500 and SB700, were produced via pyrolysis at 500 °C and 700 °C, respectively. The results indicate that the physicochemical properties of biochar change with increasing pyrolysis temperature. In addition, adsorption kinetics experiments showed that the two biochars displayed rapid adsorption within the first 60 min, with adsorption capacities of 28.08 mg/g for SB500 and 26.68 mg/g for SB700. This behavior can be attributed to a combination of physisorption and chemisorption mechanisms. These findings highlight the significance of the surface properties of biochar, especially its mesoporous structures and functional groups. Furthermore, this study suggested developing an efficient approach to mitigating the environmental and health impacts of Pb(II) contamination while addressing the issue of agricultural waste management.