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Author: search.filters.author.Buasri, AchanaiHas files: No

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    Coconut Residue-Derived Nanoporous Carbon via Hydrothermal Carbonization for Nanoporous Carbon-Based Supercapacitor Electrodes
    (2025-07-01)
    Ruenroengrit, Kemchat
    ;
    Kunyuan, Jumpon
    ;
    Ruttanadech, Nuttapong
    ;
    Kaewtrakulchai, Napat
    ;
    Puengjinda, Pramote
    The increasing demand for sustainable and cost-effective energy storage solutions has driven interest in biomass-derived carbon materials for supercapacitor electrodes. This study explores the valorization of coconut residue (CR), an abundant agricultural waste, as a carbon precursor for nanoporous carbon (NPC) production. NPC was synthesized via hydrothermal carbonization (HTC) of CR, followed by chemical activation using potassium hydroxide (KOH) at varying temperatures (700, 800, and 900 °C). The effects of activation temperature on the structure and electrochemical performance of the NPC were systematically investigated. The activated materials exhibited amorphous, highly porous structures, with surface areas increasing alongside activation temperature—reaching a maximum of 1969 m<sup>2</sup> g<sup>−1</sup> at 900 °C. Electrochemical characterization was conducted using a three-electrode setup through cyclic voltammetry (CV) and galvanostatic charge–discharge (GCD) in a 1 M Na<inf>2</inf>SO<inf>4</inf> electrolyte. The sample activated at 900 °C with a CR:KOH weight ratio of 1:2.5 achieved the highest specific capacitance of 52 F g<sup>−1</sup> at a specific current of 1 A g<sup>−1</sup>. These findings underscore the potential of CR as a low-cost and sustainable raw material for fabricating efficient electrode materials in energy storage applications.
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    Optimization and performance prediction of carbon dioxide adsorption on chitosan/activated carbon/epichlorohydrin composite materials using Box–Behnken design and artificial neural network approaches
    (2025-06-01)
    Loryuenyong, Vorrada
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    Nakhlo, Worranuch
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    Srikaenkaew, Praifha
    ;
    Yaidee, Panpassa
    ;
    Eiad-Ua, Apiluck
    Spent coffee grounds (SCGs) can be used as biomass to synthesize activated carbon (AC) through physical carbonization and chemical activation. Epichlorohydrin (EP) was used to create the chitosan (CS) and AC biopolymer composites via emulsion crosslinking. The main goal of this research is to boost the efficiency of CS/AC/EP composite materials for carbon dioxide (CO<inf>2</inf>) capture by adsorption. The impact of CS content, AC concentration, and EP quantity on CO<inf>2</inf> removal was studied applying the Box–Behnken design (BBD)-based response surface methodology (RSM) and artificial neural network (ANN)-based artificial intelligence (AI) models. The conditions for the adsorption process were optimized to forecast the maximum CO<inf>2</inf> adsorption utilizing BBD and ANN approaches. Optimal process parameters of 15.11 g CS content, 38.95 %w/w AC concentration, and 7.16 g EP quantity resulted in a CO<inf>2</inf> adsorbed of approximately 7.62 cm<sup>3</sup>/g. The coefficient of determination (R<sup>2</sup>) for the BBD model was 0.9995, while the correlation coefficient (R) for the ANN model was 0.9992. The CO<inf>2</inf> adsorption efficiency of adsorbents is enhanced by increasing the amounts of AC and EP. This study provides a technique for predicting and improving CO<inf>2</inf> capture through the development of porous polymer composite beads (CBs) with a high CO<inf>2</inf> adsorption capacity.
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    Enhanced CO2 Capture Potential of Chitosan-Based Composite Beads by Adding Activated Carbon from Coffee Grounds and Crosslinking with Epichlorohydrin
    (2024-08-01)
    Loryuenyong, Vorrada
    ;
    Nakhlo, Worranuch
    ;
    Srikaenkaew, Praifha
    ;
    Yaidee, Panpassa
    ;
    Buasri, Achanai
    Carbon dioxide (CO<inf>2</inf>) capture has been identified as a potential technology for reducing the anthropic emissions of greenhouse gases, particularly in post-combustion processes. The development of adsorbents for carbon capture and storage is expanding at a rapid rate. This article presents a novel sustainable synthesis method for the production of chitosan/activated carbon CO<inf>2</inf> adsorbents. Chitosan is a biopolymer that is naturally abundant and contains amino groups (–NH<inf>2</inf>), which are required for the selective adsorption of CO<inf>2</inf>. Spent coffee grounds have been considered as a potential feedstock for the synthesis of activated coffee grounds through carbonization and chemical activation. The chitosan/activated coffee ground composite microspheres were created using the emulsion cross-linking method with epichlorohydrin. The effects of the amount of chitosan (15, 20, and 25 g), activated coffee ground (10, 20, 30, and 40%w/w), and epichlorohydrin (2, 3, 4, 5, 6, 7 and 8 g) were examined. The CO<inf>2</inf> capture potential of the composite beads is superior to that of the neat biopolymer beads. The CO<inf>2</inf> adsorbed of synthesized materials at a standard temperature and pressure is improved by increasing the quantity of activated coffee ground and epichlorohydrin. These findings suggest that the novel composite bead has the potential to be applied in CO<inf>2</inf> separation applications.