分子印迹磁性生物炭对土霉素的选择性去除。

Selective removal of oxytetracycline by molecularly imprinted magnetic biochar.

机构信息

School of Environment, South China Normal University, Guangzhou, 510006, China; Normal University (Qingyuan) Environmental Remediation Technology Co., Ltd., Qingyuan 511500, China.

Normal University (Qingyuan) Environmental Remediation Technology Co., Ltd., Qingyuan 511500, China; Guangdong Technology Research Center for Ecological Management and Remediation of Water System, Guangzhou 510006, China; College of Resources and Environment, Zhongkai University of Agriculture and Engineering, Guangzhou 510006, China.

出版信息

Bioresour Technol. 2024 Mar;395:130394. doi: 10.1016/j.biortech.2024.130394. Epub 2024 Feb 1.

DOI:10.1016/j.biortech.2024.130394

PMID:38301940

Abstract

Molecularly imprinted magnetic biochar (MBC@MIPs) was synthesized through molecular imprinting precipitation polymerization. This material demonstrated a selective adsorption capacity of oxytetracycline (OTC) from water samples. Upon characterization of MBC@MIPs, results revealed the formation of a memory cavity shell layer on the magnetic biochar's surface, exhibiting a distinctive recognition effect alongside commendable magnetic and thermal stability. Analysis of the adsorption kinetics indicated that the OTC adsorption process aligned well with the pseudo-second-order rate equation, with chemisorption acting as the predominant mechanism for antibiotic adsorption onto MBC@MIPs. The data could be well described by the Langmuir isotherm model. At 299 K, MBC@MIPs showed a maximum binding capacity of 67.89 mg·g, surpassing that of MBC (38.84 mg·g) by 1.77 times. MBC@MIPs exhibited the highest selectivity towards OTC, with an imprinting factor (IF) of 5.64. Even amidst interference from antibiotics, MBC@MIPs maintained a significant adsorption capacity for OTC (6.10 mg·g), with IF of 6.70.

摘要

通过分子印迹沉淀聚合合成了分子印迹磁性生物炭（MBC@MIPs）。该材料表现出从水样中选择性吸附土霉素（OTC）的能力。对 MBC@MIPs 进行表征后，结果表明在磁性生物炭表面形成了一个记忆空腔壳层，表现出独特的识别效果以及良好的磁稳定性和热稳定性。吸附动力学分析表明，OTC 的吸附过程符合拟二级速率方程，化学吸附是抗生素吸附到 MBC@MIPs 上的主要机制。数据可以很好地用朗缪尔等温线模型描述。在 299 K 时，MBC@MIPs 的最大结合容量为 67.89 mg·g，比 MBC（38.84 mg·g）高 1.77 倍。MBC@MIPs 对 OTC 表现出最高的选择性，印迹因子（IF）为 5.64。即使在抗生素的干扰下，MBC@MIPs 对 OTC 的吸附容量仍保持在 6.10 mg·g，IF 为 6.70。