Rashidi Fatemeh, Larki Arash, Jafar Saghanezhad Seyyed
Department of Marine Chemistry, Faculty of Marine Science, Khorramshahr University of Marine Science and Technology, Khorramshahr, Iran.
Department of Marine Chemistry, Faculty of Marine Science, Khorramshahr University of Marine Science and Technology, Khorramshahr, Iran.
Spectrochim Acta A Mol Biomol Spectrosc. 2024 Mar 5;308:123762. doi: 10.1016/j.saa.2023.123762. Epub 2023 Dec 16.
Due to the growing concern about the environmental effects of heavy metals, researchers are developing materials that possess high absorption capacity in addition to selectivity and high absorption speed. Recently, covalent organic frameworks (COFs) have been considered as emerging and promising adsorbents for the removal of many types of pollutants. In this work, a novel and selective adsorbent (Cys-AuNPs@COF) was prepared by embedding gold nanoparticles functionalized with L-cysteine in melamine-based COF for the removal of Cr(VI) ions from wastewater. The synthesized Cys-AuNPs@COF were characterizedby Fourier-transform infrared spectroscopy (FT-IR), X-ray diffraction analysis (XRD), Field emission scanning electron microscopy (FESEM), Energy-dispersive X-ray spectroscopy (EDX), Thermo-gravimetric analysis (TGA), and elemental mapping (EMA) analysis. The removal of Cr(VI) ions was performed using a batch mode process by taking advantage of response surface methodology (RSM) based on a central composite design (CCD) model. The maximum adsorption capacity of Cys-AuNPs@COF was 151.5 mg g. The experimental results followed the Langmuir model and showed pseudo-second-order kinetics. A portable, low-cost, and highly sensitive device with a smartphone colorimeter platform was developed for in situ measurement of trace amounts of chromium (VI) ions. Due to its simplicity and versatility, this method has the potential to serve as an alternative to conventional field analysis methods.
由于对重金属环境影响的关注度不断提高，研究人员正在开发除具有选择性和高吸附速度外还具备高吸附容量的材料。最近，共价有机框架（COF）被认为是用于去除多种污染物的新兴且有前景的吸附剂。在这项工作中，通过将用L-半胱氨酸功能化的金纳米颗粒嵌入三聚氰胺基COF中制备了一种新型选择性吸附剂（Cys-AuNPs@COF），用于从废水中去除Cr(VI)离子。通过傅里叶变换红外光谱（FT-IR）、X射线衍射分析（XRD）、场发射扫描电子显微镜（FESEM）、能量色散X射线光谱（EDX）、热重分析（TGA）和元素映射（EMA）分析对合成的Cys-AuNPs@COF进行了表征。利用基于中心复合设计（CCD）模型的响应面方法（RSM），采用分批模式进行Cr(VI)离子的去除。Cys-AuNPs@COF的最大吸附容量为151.5 mg/g。实验结果符合朗缪尔模型并呈现伪二级动力学。开发了一种基于智能手机比色计平台的便携式、低成本且高灵敏度的装置，用于原位测量痕量铬（VI）离子。由于其简单性和通用性，该方法有可能成为传统现场分析方法的替代方法。
