State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, PR China.
State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, PR China.
J Colloid Interface Sci. 2022 Dec;627:793-803. doi: 10.1016/j.jcis.2022.07.063. Epub 2022 Jul 19.
Tetracycline (TC) has poor degradability and hepatotoxicity which will increase the burden on the aquatic environment when discharged into lakes in large quantities. LDH materials are often used as adsorbents because of their superior surface area and controllability of morphology. Herein, NiFe LDH hollow microspheres (NFHMS) were synthesized by a facile hydrothermal method. The removal of tetracycline by the as-prepared material in an aquatic environment was systematically investigated through comprehensive characterizations. The NFHMS sample presents a larger specific surface area than the two control samples, which contributes to its higher adsorption performance. The adsorption mechanisms of TC on NFHMS is mainly electrostatic adsorption. The fitting results of experimental data coincide well with pseudo-second-order and Weber-Morris models through kinetic simulation. Moreover, the Langmuir model is verified to be more suitable than the Freundlich model in elucidating molecular surface adsorption, and the maximum adsorption capacity of NFHMS obtained from the Langmuir model is 90.9 mg g. Higher temperature is beneficial to improve the adsorption performance, and the adsorption process is spontaneous and endothermic. The initial pH of the solution will affect the adsorption capacity, and the partial neutral condition is more favorable. In addition, NFHMS sample exhibits good stability in cyclic tests. Therefore, NFHMS material is expected to be a very promising adsorbent for treating tetracycline in wastewater.
四环素（TC）的降解性差，具有肝毒性，如果大量排入湖泊，会增加对水生态环境的负担。LDH 材料通常被用作吸附剂，因为它们具有较大的比表面积和形态可控性。本文通过简便的水热法合成了 NiFe LDH 空心微球（NFHMS）。通过综合表征系统地研究了在水环境中制备的材料对四环素的去除作用。与两个对照样品相比，NFHMS 样品具有更大的比表面积，这有助于提高其吸附性能。TC 在 NFHMS 上的吸附机制主要为静电吸附。通过动力学模拟，实验数据的拟合结果与准二级和 Weber-Morris 模型吻合较好。此外，Langmuir 模型比 Freundlich 模型更适合解释分子表面吸附，从 Langmuir 模型得到的 NFHMS 的最大吸附容量为 90.9 mg/g。较高的温度有利于提高吸附性能，吸附过程是自发的和吸热的。溶液的初始 pH 值会影响吸附容量，偏中性条件更有利。此外，NFHMS 样品在循环测试中表现出良好的稳定性。因此，NFHMS 材料有望成为处理废水中四环素的一种很有前途的吸附剂。
