Wei Fuhua, Yu Xiang, Ren Qinhui, Chen Hongliang, Zhang Yutao, Liang Zhao
College of Chemistry and Chemical Engineering, Anshun University, Anshun, Guizhou 561000, China.
Institute of Micro/Nano Materials and Devices, Ningbo University of Technology, Ningbo City 315211, China.
J Phys Chem A. 2024 Sep 19;128(37):7889-7898. doi: 10.1021/acs.jpca.4c03714. Epub 2024 Sep 4.
The composite material, consisting of graphene oxide (GO) and chromium metal-organic frameworks (Cr-MOFs), was successfully synthesized by using a solvothermal method. The organic ligand employed was 2,5-dihydroxyterephthalic acid, while chromium acetate served as the source of the metal. The resulting material underwent characterization through Fourier transform infrared, scanning electron microscopy, and X-ray diffraction techniques. Subsequently, the adsorption capacity of the composite material toward moxifloxacin was evaluated. The results indicated a gradual increase in the moxifloxacin removal rate from GO/Cr-MOFs over time until reaching an equilibrium with a maximum removal rate of 90.4%. Additionally, it was observed that higher temperatures led to a decrease in the adsorption capacity. By incorporating 30 mg of GO/Cr-MOFs into a solution containing 40 ppm of moxifloxacin, the adsorption capacity could be maximized at 222.25 mg/g. Experimental data on MOF adsorption of moxifloxacin were analyzed using pseudo-first-order kinetics (PFO), pseudo-second-order kinetics (PSO), and Langmuir, Freundlich, and Temkin isotherm models for theoretical research purposes. Results showed that the PSO model exhibited a better correlation than the PFO model did. Furthermore, experimental data demonstrated good agreement with the Freundlich isothermal model, suggesting its effectiveness in accurately describing the adsorption process. Henceforth, it can be concluded that chemisorption plays a significant role in removing moxifloxacin by GO/Cr-MOFs. The van't Hoff equation analysis revealed an exothermic and spontaneous nature of moxifloxacin adsorption onto GO/Cr-MOFs. Compared to other materials, the GO/Cr-MOF composite exhibited high potential for applications such as drug removal or related fields.
采用溶剂热法成功合成了由氧化石墨烯（GO）和铬金属有机框架（Cr-MOFs）组成的复合材料。所使用的有机配体为2,5-二羟基对苯二甲酸，而醋酸铬作为金属源。通过傅里叶变换红外光谱、扫描电子显微镜和X射线衍射技术对所得材料进行了表征。随后，评估了该复合材料对莫西沙星的吸附能力。结果表明，随着时间的推移，GO/Cr-MOFs对莫西沙星的去除率逐渐增加，直至达到平衡，最大去除率为90.4%。此外，观察到较高的温度会导致吸附能力下降。将30 mg的GO/Cr-MOFs加入到含有40 ppm莫西沙星的溶液中，吸附容量可在222.25 mg/g时达到最大值。为了进行理论研究，使用伪一级动力学（PFO）、伪二级动力学（PSO）以及朗缪尔、弗伦德利希和坦金等温线模型对MOF吸附莫西沙星的实验数据进行了分析。结果表明，PSO模型比PFO模型具有更好的相关性。此外，实验数据与弗伦德利希等温线模型吻合良好，表明其在准确描述吸附过程方面的有效性。因此，可以得出结论，化学吸附在GO/Cr-MOFs去除莫西沙星的过程中起着重要作用。范特霍夫方程分析表明，莫西沙星吸附到GO/Cr-MOFs上具有放热和自发的性质。与其他材料相比，GO/Cr-MOF复合材料在药物去除等相关领域具有很高的应用潜力。
