Reusable waste-derived magnetic mesoporous activated carbon for efficient preconcentration and adsorptive removal of fluoroquinolones

IF 5.5 Q1 ENGINEERING, CHEMICAL

Chemical Engineering Journal Advances Pub Date : 2025-05-13 DOI:10.1016/j.ceja.2025.100771

Bongiwe Apatia Mvala , Tshimangadzo S. Munonde , Mokae Fanuel Bambo , Kgabo Phillemon Matabola , Philiswa Nosizo Nomngongo

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Abstract

In this study, a magnetic mesoporous activated carbon derived from PET waste plastic bottles and acid mine drainage (AMD-mag@PET-MMAC) was employed for the enrichment and adsorptive removal of selected fluoroquinolone (FQ) antibiotics. The quantification of FQ antibiotics in aqueous and real samples was achieved using liquid chromatographic systems. At optimum conditions, the maximum adsorption capacities ranging from 233- 385 mg/g were obtained, confirming the suitability of the adsorbent for the removal of FQs in real water samples. The Langmuir and Pseudo-second order models best described the equilibrium isotherm and kinetic data. The adsorption mechanism involves hydrogen bonding, pore filling, π-π interactions and electrostatic interactions. The analytical performance of the method revealed a linear range of 0.2–100 ng/L with R² values greater than 0.99, %RSD values <5 % and LOD and LOQ ranges of 0.06–0.21 and 0.2–0.69 ng/L and 0.6 ng/L, respectively. The method was validated using real wastewater samples spiked with known concentrations of the analytes.

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可重复使用的废物衍生的磁性介孔活性炭用于氟喹诺酮类药物的高效预富集和吸附去除

本研究以PET废塑料瓶和酸性矿山废水（AMD-mag@PET-MMAC）为原料制备磁性介孔活性炭，对选定的氟喹诺酮类抗生素进行富集和吸附去除。采用液相色谱系统对实际样品和实际样品中的FQ抗生素进行定量分析。在最佳条件下，获得的最大吸附量为233 ~ 385 mg/g，证实了吸附剂对实际水样中FQs的去除效果。Langmuir和伪二阶模型最好地描述了平衡等温线和动力学数据。吸附机理包括氢键、孔隙填充、π-π相互作用和静电相互作用。该方法的线性范围为0.2 ~ 100 ng/L, R2 < 0.99, RSD < 5%，检出限和检出限分别为0.06 ~ 0.21、0.2 ~ 0.69 ng/L和0.6 ng/L。该方法被验证使用真实的废水样品加入已知浓度的分析物。

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