コーヒー粕由来の水熱活性炭：合成、特性評価、メチレンブルー吸着性能
COFFEE-GROUND–DERIVED HYDROTHERMALLY ACTIVATED CARBON: SYNTHESIS, CHARACTERIZATION, AND ADSORPTION PERFORMANCE TOWARD METHYLENE BLUE (原題)
Makhabbat Kunarbekova, А. Қаныкешова, Krisztina László, Jakpar Jandosov, Zhexenbek Toktarbay
🤖 gxceed AI 要約
日本語
コーヒー粕を水熱炭化とアルカリ活性化で多孔質炭素に変換し、メチレンブルー吸着性能を評価。活性炭は細孔構造と含酸素官能基により高い吸着能を示し、廃棄物の資源化と排水処理への応用可能性を示した。
English
Spent coffee grounds were converted into porous carbons via hydrothermal carbonization and alkaline activation. The activated carbons showed enhanced methylene blue adsorption due to developed porosity and oxygen functional groups, demonstrating a sustainable route for waste valorization and wastewater treatment.
Unofficial AI-generated summary based on the public title and abstract. Not an official translation.
📝 gxceed 編集解説 — Why this matters
日本のGX文脈において
日本では食品廃棄物の削減と資源循環が重視されており、コーヒー粕の有効活用は廃棄物処理コスト削減や循環経済への貢献が期待される。ただし、GX政策や開示制度との直接的な関連は薄い。
In the global GX context
Globally, this research aligns with circular economy and waste-to-resource initiatives, offering a low-cost adsorbent for wastewater treatment. However, it has limited direct relevance to climate disclosure or transition finance frameworks.
👥 読者別の含意
🔬研究者:廃棄物由来吸着材の合成と性能評価に関する方法論と知見を提供。
🏢実務担当者:排水処理や廃棄物管理の現場で、コーヒー粕由来の吸着材を利用する可能性を示唆。
📄 Abstract（原文）
Spent coffee grounds (SCGs), an abundant lignocellulosic agro-industrial residue, were valorized into porous carbonaceous adsorbents through hydrothermal carbonization (HTC) followed by alkaline activation, aiming at the efficient removal of methylene blue (MB) from aqueous solutions. HTC was conducted under subcritical water conditions at temperatures of 180-220 °C and residence times of 2-6 h, producing hydrochars with tunable physicochemical properties. The obtained hydrochars were subsequently activated using potassium hydroxide in a microwave reactor to enhance surface functionality and porosity. The structural, textural, and chemical characteristics of the materials were comprehensively analyzed by N₂ physisorption (BET surface area and pore size distribution), FTIR spectroscopy, SEM, XRD/Raman spectroscopy, and elemental analysis (XRF/EDX). Batch adsorption experiments were performed to evaluate the adsorption kinetics, equilibrium isotherms, and thermodynamic behavior toward methylene blue. The activated coffee-ground-derived carbons exhibited rapid adsorption kinetics and significantly enhanced adsorption capacities compared to non-activated hydrochars. The improved performance was attributed to the synergistic effects of developed micro- and mesoporous structures and abundant oxygen-containing surface functional groups. Mechanistic analysis indicated that methylene blue uptake was governed by a combination of pore filling, electrostatic attraction, π– π electron donor–acceptor interactions between the aromatic carbon surface and dye molecules, hydrogen bonding, and intraparticle diffusion. The results demonstrate that hydrothermal carbonization coupled with mild alkaline activation provides an effective and sustainable route for converting spent coffee grounds into high-performance adsorbents. This study elucidates the relationships between synthesis conditions, surface chemistry, textural properties, and adsorption performance, highlighting the potential of SCG-derived activated carbon for practical wastewater treatment applications.
🔗 Provenance — このレコードを発見したソース
- openalex https://doi.org/10.53360/2788-7995-2026-2(22)-74first seen 2026-08-22 04:58:50
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