Hubei Key Laboratory of Mineral Resources Processing and Environment, School of Resources and Environmental Engineering, State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, China.
China-UK Water and Soil Resources Sustainable Utilization Joint Research Centre, Farmland Irrigation Research Institute, Chinese Academy of Agricultural Sciences, Xinxiang 453002, China.
Bioresour Technol. 2021 Jan;319:124199. doi: 10.1016/j.biortech.2020.124199. Epub 2020 Oct 2.
In this study, biochar derived from municipal sludge was activated by zinc chloride, which was first time used as the precursor for hydrothermal synthesis of magnetic sludge biochar (Fe/Zn-SBC) for tetracycline (TC) and ciprofloxacin (CIP) removal. The maximum adsorption capacity of Fe/Zn-SBC for TC and CIP were 145 mg g and 74.2 mg g at 25 °C, respectively. Kinetics, isotherms, thermodynamics and characterization analysis suggested that the adsorption process was dominated by pore filling, oxygen-containing groups complexation, π-π conjugation and hydrogen bonding. Fe/Zn-SBC had the high selective adsorption capacity for TC and CIP in a wide pH range and even at the high ionic strength. The magnetic sensitivity ensured its easy separation performance. The co-processing of ultrasound and ethanol could effectively regenerate the used Fe/Zn-SBC. Also, it exhibited great environmental safety in the pH range of 3 to 12. These superiority suggested that it is a promising adsorbent for antibiotics removal.
在这项研究中，利用氯化锌对城市污泥衍生的生物炭进行了活化，这是首次将其用作水热合成磁性污泥生物炭（Fe/Zn-SBC）的前体，以去除四环素（TC）和环丙沙星（CIP）。在 25°C 下，Fe/Zn-SBC 对 TC 和 CIP 的最大吸附容量分别为 145 mg/g 和 74.2 mg/g。动力学、等温线、热力学和特性分析表明，吸附过程主要受孔填充、含氧基团络合、π-π 共轭和氢键控制。Fe/Zn-SBC 在很宽的 pH 范围甚至在高离子强度下对 TC 和 CIP 具有高选择性吸附能力。磁敏性确保了其易于分离的性能。超声和乙醇的共同处理可以有效地再生用过的 Fe/Zn-SBC。此外，它在 pH 值为 3 到 12 的范围内表现出很好的环境安全性。这些优势表明，它是一种很有前途的抗生素去除吸附剂。
