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Author: search.filters.author.Choodum, AreeSubject: search.filters.subject.Composite

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    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.
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    Effective recovery of phosphate from wastewater using biodegradable calcium-rich shell wastes composite macroporous cryogel
    (2024-06-20)
    Kaewnoo, Satabodee
    ;
    Wongniramaikul, Worawit
    ;
    Boonkanon, Chanita
    ;
    Taweekarn, Tarawee
    ;
    Kleangklao, Bussakorn
    The recovery of phosphorus from wastewater holds promise as a sustainable source of organic phosphorus for agricultural use while aiding in meeting legislative discharge limits for phosphorus to control and mitigate eutrophication. This study introduces a novel approach in which calcium-rich calcined oyster shell (Ca–COS) is immobilized on a starch-based monolithic cryogel, resulting in a green tablet (Cry–Ca–COS) capable of efficiently recovering phosphate from water through chemisorption on the material surface and precipitation in the liquid phase. The formed tablet prevents sorbent loss post-adsorption, facilitating reusability. Under optimal conditions (i.e., three 0.83 cm thick Cry–Ca–COS tablets, an initial phosphate concentration of 12 mg L<sup>−1</sup> in 1 L without pH adjustment (pH 6.3), and a contact time of 60 minutes), a phosphate removal efficiency of 83.11% ± 0.68% and a maximum removal capacity of 9.97 mg g<sup>−1</sup> were achieved. Both the Langmuir isotherm model and pseudo-second-order kinetic model exhibited good fits to the experimental data, with an estimated activation energy of 81.9 kJ mol<sup>−1</sup> and a positive enthalpy of 9.3 kJ mol<sup>−1</sup>, indicating an endothermic chemisorption process with a monolayer surface coverage of phosphate on Cry–Ca–COS. In real samples, Cry–Ca–COS demonstrated a high removal efficiency ranging from 98.48% ± 1.87%–99.16% ± 0.72%, with the adsorbed material biodegrading within 24 days under soil burial conditions. A preliminary study was conducted to explore the feasibility of utilizing phosphate-adsorbed Cry–Ca–COS as a fertilizer for cultivating water spinach (Ipomoea aquatica Forsk.), and further in-depth investigation is required for a comprehensive report in the future. Thus, Cry–Ca–COS emerges as an environmentally friendly and effective tool for phosphate removal and recovery.