College of Food Science and Engineering, Northwest A&F University, Yangling 712100, Shaanxi, China.
Qinghai Provincial Key Laboratory of Qinghai-Tibet Plateau Biological Resources, Northwest Institute of Plateau Biology, Chinese Academy of Sciences, 23 Xinning Road, Xining, Qinghai 810008, P. R. China.
ACS Appl Mater Interfaces. 2020 Mar 18;12(11):13189-13199. doi: 10.1021/acsami.9b23098. Epub 2020 Mar 5.
Nondegradable heavy metals have caused great dangers to the environment and human health. Combining stimuli-responsive materials with conventional MOF-based adsorbents has been considered an effective method to generate intelligent adsorbents for superior control over the adsorption process. Herein, a smart MOF-based ratiometric fluorescent adsorbent was designed to accurately monitor the progression of the removal of copper ions with dual-emitting fluorescence signal. Unlike the traditional difunctional materials, this delicately designed platform overcomes the huge energy gap to achieve two functions simultaneously. This unconventional platform provides a reliable fluorescent response toward Cu during the removing process, changing linearly related to the degree of the adsorption process, which holds extreme promise in effectively monitoring the adsorption process. The underlying relationship of the adsorption and fluorescence response process toward copper was investigated by density functional theory (DFT) calculations. In particular, because of the favorable ion binding affinity of ZIF-8 and self-calibrating effect of RhB, the as-prepared smart adsorbent demonstrates a superior adsorption performance of 608 mg g, broad response range (0.05-200 ppm, 2.07 × 10to 8.29 × 10 M), ultrahigh sensitivity (0.04 ppm, 1.91 × 10 M) toward Cu and strong anti-interference ability. This smart adsorbent opens an intelligent pathway to promote substantial advancements in the fields of environmental monitoring and industrial waste management.
不可降解的重金属对环境和人类健康造成了极大的危害。将刺激响应材料与传统的基于 MOF 的吸附剂结合，被认为是生成智能吸附剂的有效方法，可以更好地控制吸附过程。本文设计了一种基于智能 MOF 的比率荧光吸附剂，以通过双发射荧光信号准确监测铜离子去除过程的进展。与传统的双功能材料不同，这种精心设计的平台克服了巨大的能量间隙，实现了两种功能的同时应用。这种非传统平台为去除过程中的 Cu 提供了可靠的荧光响应，与吸附过程的程度呈线性相关，在有效监测吸附过程方面具有巨大的应用潜力。通过密度泛函理论（DFT）计算研究了吸附和荧光响应过程与铜之间的关系。特别是，由于 ZIF-8 的有利离子结合亲和力和 RhB 的自校准效应，所制备的智能吸附剂对 Cu 表现出优异的吸附性能（608mg/g）、宽响应范围（0.05-200ppm，2.07×10-5~8.29×10-5M）、超高灵敏度（0.04ppm，1.91×10-5M）和较强的抗干扰能力。这种智能吸附剂为环境监测和工业废物管理领域的发展开辟了一条智能化途径。
