Phawachalotorn, Chanadda

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Preferred name
Phawachalotorn, Chanadda
Alternative Name
Phawachalotorn, C.
Main Affiliation
Email
chanadda.ph@kmitl.ac.th

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    Item type:Publication,
    Innovative eco-friendly methyl orange removal: Mechanism, kinetic, and thermodynamic study using starch cryogel-integrated mesoporous silica nanoparticles
    (2024-11-15)
    Taweekarn, Tarawee
    ;
    Wongniramaikul, Worawit
    ;
    Sriprom, Wilasinee
    ;
    Limsakul, Wadcharawadee
    ;
    Phawachalotorn, Chanadda
    This study introduces a novel, eco−friendly composite, uncalcined mesoporous silica nanoparticles incorporated into a starch cryogel (MSNs-Cry), designed for the effective removal of methyl orange (MO) from water. MSNs−Cry integrates uncalcined mesoporous silica nanoparticles (MSNs) within a starch cryogel network, leveraging the high adsorption capacity of MSNs. The composite achieved a maximum adsorption capacity of 18.98 mg g⁻<sup>1</sup> and demonstrated high removal efficiencies of 99.00 % ± 0.21 % in synthetic water (10 mg L<sup>−1</sup> MO) and 92.77 % ± 1.76 % in real wastewater containing 0.43 mg L<sup>−1</sup> MO. The Langmuir isotherm model provided a superior fit (R<sup>2</sup> = 0.9930) compared to the Freundlich model (R<sup>2</sup> = 0.9180), and the adsorption kinetics followed a pseudo−second−order model (R<sup>2</sup> = 0.9917). The primary adsorption mechanisms included electrostatic attraction, hydrophobic interactions, and hydrogen bonding. The process was endothermic (ΔH° = 31.3 kJ mol<sup>−1</sup>), spontaneous, and more favorable at higher temperatures (ΔG° = −34.2 to −38.6 kJ mol<sup>−1</sup> at 298–318 K). In the presence of sodium silicate at 13.1 times the MO concentration, removal efficiency drops by 35.77 %, and with sodium sulfate and urea at 100 times the MO concentration, it decreases by 8.65 %. Despite these challenges, MSNs−Cry effectively removes MO in the presence of the anionic dye Congo Red and metal ions, demonstrating its selective adsorption capabilities. The tablet form of MSNs−Cry prevents the loss of uncalcined MSNs, mitigating potential environmental and operational impacts. Additionally, the composite's effectiveness at a natural pH of 6.65 eliminates the need for pH adjustment, offering a cost−effective solution for real−world applications. This study establishes MSNs−Cry as a promising material for sustainable water purification.