ZnClで活性化したサトウキビバガス由来の活性炭系吸着剤による塩酸テトラサイクリンの吸着・脱着性能と機構の解明

Adsorption and Desorption Performance and Mechanism of Tetracycline Hydrochloride by Activated Carbon-Based Adsorbents Derived from Sugar Cane Bagasse Activated with ZnCl.

• Yixin Cai
• Liming Liu
• Huafeng Tian
• Zhennai Yang
• Xiaogang Luo

抄録

ZnClで修飾したサトウキビバガス由来の活性炭系吸着剤による塩酸テトラサイクリンの吸着・脱着挙動を調べた。この活性炭をSEM, EDX, BET, XRD, FTIR, XPSで試験した。この活性炭は、平均細孔径が2.52 nm、細孔容積が0.45 m gに達し、831 m gの高いBET表面積を示した。バッチ実験の結果はフロイントリッヒ方程式,擬似2次動力学及び粒子内拡散モデルにより記述することができ、318Kの条件下で最大吸着容量は239.6mg gに達した。特性評価とバッチ実験の結果を解析し、吸着・脱着機構を検討した。テトラサイクリン塩酸塩と活性炭は、π-π相互作用とカチオン-π結合により結合していた。溶離液としてエタノールを用い、テトラサイクリン塩酸塩の10個の水素結合アクセプターと結合し、水素結合により複合体を形成してリサイクルを達成した。

Adsorption and desorption behaviors of tetracycline hydrochloride by activated carbon-based adsorbents derived from sugar cane bagasse modified with ZnCl were investigated. The activated carbon was tested by SEM, EDX, BET, XRD, FTIR, and XPS. This activated carbon exhibited a high BET surface area of 831 m g with the average pore diameter and pore volume reaching 2.52 nm and 0.45 m g, respectively. The batch experimental results can be described by Freundlich equation, pseudo-second-order kinetics, and the intraparticle diffusion model, while the maximum adsorption capacity reached 239.6 mg g under 318 K. The effects of flow rate, bed height, initial concentration, and temperature were studied in fixed bed adsorption experiments, and adsorption data were fitted with six dynamic adsorption models. The results of characterizations and the batch experiments were analyzed to study the adsorption and desorption mechanisms. Tetracycline hydrochloride and activated carbon were bonded together by π-π interactions and cation-π bonds. Ethanol was used as an eluent which bonded with 10 hydrogen bond acceptors on tetracycline hydrochloride to form a complex by hydrogen bonding to achieve recycling.