CuFeO2改性生物炭对四环素的吸附特性

利用共沉淀和水热法于生物炭（BC250、BC350、BC450、BC550和BC650）负载CuFeO₂，得到的复合材料对水中四环素（TC）具有较好的去除效果.CuFeO₂与BC450质量比为2 ：1的CuFeO₂改性生物炭（CuFeO₂/BC450=2 ：1）对TC的吸附性能最强.TC于CuFeO₂/BC450=2 ：1的吸附符合颗粒内扩散模型，表明吸附是界面和孔隙扩散控制的过程.在中性pH、298 K下，CuFeO₂/BC450=2 ：1对TC的Langmuir最大吸附量为82.8 mg ·g^-1，远大于BC450的13.7 mg ·g^-1和CuFeO₂的14.8 mg ·g^-1.热力学结果表明，CuFeO₂/BC450=2 ：1对TC的吸附是自发和吸热过程.随pH增加，CuFeO₂/BC450=2 ：1对TC的吸附去除呈先增加后降低的趋势，中性条件时效果最佳.CuFeO₂/BC450=2 ：1对TC的强吸附得益于CuFeO₂负载对材料孔隙结构的改善、比表面积的增大和表面官能团、电荷属性的改变.研究结果为净化抗生素污染提供了一种高效的磁性吸附剂.

Adsorption Characteristics of Tetracycline by CuFeO2-modified Biochar

CuFeO₂-modified biochars were prepared through co-precipitation and hydrothermal methods, and the composites had high efficiency removal for tetracycline (TC) from water. The CuFeO₂-modified biochar with a 2:1 mass ratio of CuFeO₂ to BC450 (CuFeO₂/BC450=2:1) demonstrated the best adsorption performance. The kinetic process of TC adsorption by CuFeO₂/BC450=2:1 was well fitted with the intraparticle diffusion model, suggesting that the adsorption process was controlled by film and pore diffusion. Under the condition of neutral pH and 298 K, the maximum adsorption capacity of the Langmuir model of CuFeO₂/BC450=2:1 was 82.8 mg·g^-1, which was much greater than that of BC450 (13.7 mg·g^-1) and CuFeO₂(14.8 mg·g^-1). The thermodynamic data suggested that TC sorption onto CuFeO₂/BC450=2:1 was a spontaneous and endothermic process. The removal of TC by CuFeO₂/BC450=2:1 increased first and then decreased with increasing pH, and the maximum adsorption occurred under the neutral condition. The strong adsorption of TC by CuFeO₂/BC450=2:1 could be attributed to better porosity, larger specific surface area, and more active sites (e.g., functional groups and charged surfaces). This work provided an efficient magnetic adsorbent for removing antibiotics.