Nawz Tahreem Haq, Masood Muhammad Talha, Safdar Amna, Shahid Muhammad, Noor Tayyaba, Hussain Muzammil, Razi Ayesha, Umer Malik Adeel
School of Chemical and Materials Engineering (SCME), National University of Sciences and Technology (NUST), H-12 Sector, Islamabad 44000, Pakistan.
School of Interdisciplinary Engineering and Sciences (SINES), National University of Science and Technology (NUST), H-12 Sector, Islamabad 44000, Pakistan.
Micromachines (Basel). 2023 Jul 30;14(8):1534. doi: 10.3390/mi14081534.
The zeolitic imidazolate framework-67 (ZIF-67) adsorbent and its composites are known to effectively remove organic dyes from aqueous environments. Here, we report a unique crystalline MoS@ZIF-67 nanocomposite adsorbent for the efficient removal of methyl orange (MO) dye from an aqueous medium. In situ synthetic techniques were used to fabricate a well-crystalline MoS@ZIF-67 nanocomposite, which was then discovered to be a superior adsorbent to its constituents. The successful synthesis of the nanocomposite was confirmed using XRD, EDX, FTIR, and SEM. The MoS@ZIF-67 nanocomposite exhibited faster adsorption kinetics and higher dye removal efficiency compared with its constituents. The adsorption kinetic data matched well with the pseudo-second-order model, which signifies that the MO adsorption on the nanocomposite is a chemically driven process. The Langmuir model successfully illustrated the MO dye adsorption on the nanocomposite through comparing the real data with adsorption isotherm models. However, it appears that the Freundlich adsorption isotherm model was also in competition with the Langmuir model. According to the acquired thermodynamics parameters, the adsorption of MO on the MoS@ZIF-67 nanocomposite surface was determined to be spontaneous and exothermic. The findings of this research open an avenue for using the MoS@ZIF-67 nanocomposite to efficiently remove organic dyes from wastewater efflux.
沸石咪唑酯骨架结构-67（ZIF-67）吸附剂及其复合材料能够有效去除水环境中的有机染料。在此，我们报道了一种独特的晶体MoS@ZIF-67纳米复合吸附剂，用于从水介质中高效去除甲基橙（MO）染料。采用原位合成技术制备了结晶良好的MoS@ZIF-67纳米复合材料，结果发现它是一种比其组分更优异的吸附剂。利用X射线衍射（XRD）、能量散射X射线光谱（EDX）、傅里叶变换红外光谱（FTIR）和扫描电子显微镜（SEM）对纳米复合材料的成功合成进行了确认。与它的组分相比，MoS@ZIF-67纳米复合材料表现出更快的吸附动力学和更高的染料去除效率。吸附动力学数据与伪二级模型拟合良好，这表明纳米复合材料对MO的吸附是一个化学驱动过程。通过将实际数据与吸附等温线模型进行比较，朗缪尔模型成功地说明了纳米复合材料对MO染料的吸附情况。然而，弗伦德里希吸附等温线模型似乎也与朗缪尔模型存在竞争关系。根据获得的热力学参数，确定MO在MoS@ZIF-67纳米复合材料表面的吸附是自发的且放热的。本研究结果为利用MoS@ZIF-67纳米复合材料从废水流出物中高效去除有机染料开辟了一条途径。
