School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, 710055 Shaanxi, Xi'an, PR China; Key Laboratory of Northwest Water Resources, Environment and Ecology, MOE, PR China; Key Laboratory of Environmental Engineering, Shaanxi Province, PR China.
School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, 710055 Shaanxi, Xi'an, PR China; Key Laboratory of Northwest Water Resources, Environment and Ecology, MOE, PR China; Key Laboratory of Environmental Engineering, Shaanxi Province, PR China.
Bioresour Technol. 2022 Feb;346:126672. doi: 10.1016/j.biortech.2022.126672. Epub 2022 Jan 6.
The object of this work was to synthesize an iron and aminoacetic acid sequentially modified hierarchical porous biochar (AC-Fe@HPBC) for tetracycline (TC) removal from aqueous solution. Results showed that AC-Fe@HPBC had a larger surface area (362.5370 m/g), developed microporous structure (0.1802 cm/g), and numerous functional groups, which provided more adsorption sites. The maximum adsorption capacity towards TC by AC-Fe@HPBC was 457.85 mg/g, 1.43, 1.29 and 1.20-fold than that of HPBC, AC@PHBC and Fe@HPBC, respectively, and the super-fast adsorptive equilibrium was achieved within 10 min. Additionally, introducing amino and carboxyl functional groups on the AC-Fe@HPBC surface significantly broadened the operation pH range (3-11). Site energy analysis indicated TC and AC-Fe@HPBC had stronger adsorption affinity at a higher temperature. The adsorption mechanism involved pore filling, surface complexation, H-bond and π-π interaction. Moreover, the reusability experiments proved AC-Fe@HPBC as an effective adsorbent for TC removal from aqueous solution.
本工作旨在合成一种铁和氨基酸依次修饰的分级多孔生物炭（AC-Fe@HPBC），用于从水溶液中去除四环素（TC）。结果表明，AC-Fe@HPBC 具有更大的表面积（362.5370 m/g）、发达的微孔结构（0.1802 cm/g）和众多的功能基团，为吸附提供了更多的活性位点。AC-Fe@HPBC 对 TC 的最大吸附容量为 457.85 mg/g，分别是 HPBC、AC@PHBC 和 Fe@HPBC 的 1.43、1.29 和 1.20 倍，且在 10 min 内达到超快速吸附平衡。此外，在 AC-Fe@HPBC 表面引入氨基和羧基官能团，显著拓宽了操作 pH 范围（3-11）。点位能分析表明，TC 和 AC-Fe@HPBC 在较高温度下具有更强的吸附亲和力。吸附机制涉及孔填充、表面络合、氢键和π-π 相互作用。此外，重复使用实验证明 AC-Fe@HPBC 是一种从水溶液中有效去除 TC 的吸附剂。
