Department of Chemistry, Tehran North Branch, Islamic Azad University, Tehran, Iran.
Department of Chemical Engineering, ETSEIB, Universitat Politècnica de Catalunya, Diagonal 647, 08028, Barcelona, Spain.
Chemosphere. 2021 May;271:129610. doi: 10.1016/j.chemosphere.2021.129610. Epub 2021 Jan 11.
This study reports on an easy and scalable synthesis method of a novel magnetic nanocomposite (GO/ZIF-8/γ-AlOOH) based on graphene oxide (GO) nanosheets decorated with zeolitic imidazolate framework-8 (ZIF-8), pseudo-boehmite (γ-AlOOH), and iron oxide (FeO) nanoparticles by combining solvothermal and solid-state dispersion (SSD) methods. The nanocomposite was successfully applied to remove of diclofenac sodium (DCF) - a widely used pharmaceutical - from water. Response Surface Methodology (RSM) was used to optimize the adsorption process and assess the interactions among the influencing factors on DCF removal efficiency; including contact time, adsorbent dosage, initial pH, solution temperature, and DCF concentration. Adsorption isotherm results showed a good fitting with the Langmuir isotherm model with an exceptional adsorption capacity value of 2594 mg g at 30 °C, which was highly superior to the previously reported adsorbents. In addition, kinetic and thermodynamic investigations further illustrated that the adsorption process was fast (equilibrium time = 50 min) and endothermic. The regeneration of GO/ZIF-8/γ-AlOOH nanocomposite using acetic acid solution (10% v/v) after a simple magnetic separation was confirmed in five consecutive cycles, which eliminate the usage of organic solvents. The nanocomposite has also shown a superior performance in treating a simulated hospital effluent that contained various pharmaceuticals as well as other organic, and inorganic constituents.
本研究报告了一种基于氧化石墨烯（GO）纳米片的新型磁性纳米复合材料（GO/ZIF-8/γ-AlOOH）的简便、可扩展的合成方法，该纳米复合材料通过溶剂热和固态分散（SSD）方法合成，GO 纳米片上修饰有沸石咪唑酯骨架-8（ZIF-8）、拟薄水铝石（γ-AlOOH）和氧化铁（FeO）纳米颗粒。该纳米复合材料成功应用于从水中去除一种广泛使用的药物——双氯芬酸钠（DCF）。响应面法（RSM）用于优化吸附过程，并评估影响 DCF 去除效率的因素之间的相互作用，包括接触时间、吸附剂用量、初始 pH 值、溶液温度和 DCF 浓度。吸附等温线结果表明，该吸附等温线非常适合 Langmuir 等温线模型，在 30°C 时的吸附容量值为 2594mg/g，远高于先前报道的吸附剂。此外，动力学和热力学研究进一步表明，吸附过程快速（平衡时间=50 分钟）且吸热。使用 10%（v/v）的乙酸溶液对 GO/ZIF-8/γ-AlOOH 纳米复合材料进行简单的磁分离后，可在五个连续循环中进行再生，无需使用有机溶剂。该纳米复合材料在处理含有各种药物以及其他有机和无机成分的模拟医院废水方面也表现出了优异的性能。
