School of Environmental Engineering, Wuhan Textile University, Wuhan, 430073, China.
Yangtze River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Wuhan, Hubei, 430223, China.
Environ Res. 2023 Dec 15;239(Pt 1):117227. doi: 10.1016/j.envres.2023.117227. Epub 2023 Sep 30.
Excessive phosphate and tetracycline (TC) contaminants pose a serious risk to human health and the ecological environment. As such exploring the simultaneous adsorption of phosphate and TC is garnering increasing attention. In this study, an efficient lanthanum ferrate magnetic biochar (FLBC) was synthesised from crab shells using an ultrasound-assisted sol-gel method to study its performance and mechanisms for phosphate and TC adsorption in aqueous solutions in mono/bis systems. According to the Langmuir model, the developed exhibited a maximum adsorption capacity of 65.62 mg/g for phosphate and 234.1 mg/g for TC (pH:7.0 ± 0.1, and 25 °C). Further, it exhibited high resistance to interference and pH suitability. In practical swine wastewater applications, whereby the concentrations of phosphate and TC are 37 and 19.97 mg/L, respectively, the proposed material demonstrated excellent performance. In addition, electrostatic adsorption, chemical precipitation and ligand exchange were noted to be the main mechanisms for phosphate adsorption by FLBC, whereas hydrogen bonding and π-π interaction were the main adsorption mechanisms for TC adsorption. Therefore, this study successfully prepared a novel and efficient adsorbent for phosphate and TC.
过量的磷酸盐和四环素（TC）污染物对人类健康和生态环境构成严重威胁。因此，探索同时吸附磷酸盐和 TC 的方法越来越受到关注。本研究采用超声辅助溶胶-凝胶法，以蟹壳为原料，合成了一种高效的镧铁氧体磁性生物炭（FLBC），用于研究其在单/双体系水溶液中吸附磷酸盐和 TC 的性能和机理。根据 Langmuir 模型，所制备的材料对磷酸盐的最大吸附容量为 65.62 mg/g，对 TC 的最大吸附容量为 234.1 mg/g（pH：7.0±0.1，25°C）。此外，它还表现出对干扰和 pH 适应性的高抵抗力。在实际的猪废水中，磷酸盐和 TC 的浓度分别为 37 和 19.97 mg/L，该材料表现出优异的性能。此外，静电吸附、化学沉淀和配体交换被认为是 FLBC 吸附磷酸盐的主要机制，而氢键和π-π相互作用是吸附 TC 的主要机制。因此，本研究成功制备了一种新型高效的磷酸盐和 TC 吸附剂。
