Elmekawy Ahmed, Quach Qui, Abdel-Fattah Tarek M
Applied Research Center at Thomas Jefferson National Accelerator Facility and Department of Molecular Biology and Chemistry at Christopher, Newport University, Newport News, VA, 23606, USA.
Department of Physics, Tanta University, Tanta, Al Gharbiyah, Egypt.
Sci Rep. 2023 Aug 8;13(1):12845. doi: 10.1038/s41598-023-38420-2.
In this study, we used solvent assisted mechano-synthesis strategies to form multifunctional organic-inorganic nanocomposites capable of removing both organic and inorganic contaminants. A zeolite X (Ze) and activated carbon (AC) composite was synthesized via state-of-the-art mechanical mixing in the presence of few drops of water to form Ze/AC. The second composite (Ze/L/AC) was synthesized in a similar fashion, however this composite had the addition of disodium terephthalate as a linker. Both materials, Ze/AC and Ze/L/AC, were characterized using scanning electron microscope (SEM), energy-dispersive X-ray spectroscopy (EDS), Powdered X-ray diffraction (P-XRD), Fourier-transform infrared spectrometry (FTIR), Accelerated Surface Area and Porosimetry System (ASAP), and thermal gravimetric analysis (TGA). The SEM-EDS displayed the surface structure and composition of each material. The sodium, oxygen and carbon contents increased after linker connected Ze and AC. The P-XRD confirmed the crystallinity of each material as well as the composites, while FTIR indicated the function groups (C=C, O-H) in Ze/L/AC. The contaminant adsorption experiments investigated the effects of pH, temperature, and ionic strength on the adsorption of methylene blue (MB) and Co(II) for each material. In MB adsorption, the first-order reaction rate of Ze/L/AC (0.02 h) was double that of Ze/AC (0.01 h). The reaction rate of Ze/L/AC (4.8 h) was also extraordinarily higher than that of Ze/AC (0.6 h) in the adsorption of Co(II). Ze/L/AC composite achieved a maximum adsorption capacity of 44.8 mg/g for MB and 66.6 mg/g for Co(II) ions. The MB adsorption of Ze/AC and Ze/L/AC was best fit in Freundlich model with R of 0.96 and 0.97, respectively, which indicated the multilayer adsorption. In the Co(II) adsorption, the data was highly fit in Langmuir model with R of 0.94 and 0.92 which indicated the monolayer adsorption. These results indicated both materials exhibited chemisorption. The activation energy of Ze/L/AC in MB adsorption (34.9 kJ mol) was higher than that of Ze/L/AC in Co (II) adsorption (26 kJ mol).
在本研究中，我们采用溶剂辅助机械合成策略来制备能够去除有机和无机污染物的多功能有机-无机纳米复合材料。通过在几滴水滴存在下进行先进的机械混合，合成了沸石X（Ze）和活性炭（AC）复合材料，即Ze/AC。第二种复合材料（Ze/L/AC）以类似方式合成，不过该复合材料添加了对苯二甲酸钠作为连接剂。使用扫描电子显微镜（SEM）、能量色散X射线光谱仪（EDS）、粉末X射线衍射仪（P-XRD）、傅里叶变换红外光谱仪（FTIR）、加速表面积和孔隙率测定系统（ASAP）以及热重分析（TGA）对Ze/AC和Ze/L/AC这两种材料进行了表征。SEM-EDS展示了每种材料的表面结构和组成。连接剂连接Ze和AC后，钠、氧和碳的含量增加。P-XRD证实了每种材料以及复合材料的结晶度，而FTIR表明了Ze/L/AC中的官能团（C=C、O-H）。污染物吸附实验研究了pH值、温度和离子强度对每种材料吸附亚甲基蓝（MB）和Co（II）的影响。在MB吸附中，Ze/L/AC的一级反应速率（0.02 h）是Ze/AC（0.01 h）的两倍。在Co（II）吸附中，Ze/L/AC的反应速率（4.8 h）也远高于Ze/AC（0.6 h）。Ze/L/AC复合材料对MB的最大吸附容量为44.8 mg/g，对Co（II）离子的最大吸附容量为66.6 mg/g。Ze/AC和Ze/L/AC对MB的吸附最符合Freundlich模型，R值分别为0.96和0.97，这表明是多层吸附。在Co（II）吸附中，数据高度符合Langmuir模型，R值分别为0.94和0.92，这表明是单层吸附。这些结果表明这两种材料均表现出化学吸附。Ze/L/AC在MB吸附中的活化能（34.9 kJ/mol）高于其在Co（II）吸附中的活化能（26 kJ/mol）。
