Shili Q I N, Xudong H E, Fenglong J I N, Ying W A N G, Hongtao C H U, Shuang H A N, Yangyang S U N, Lidi G A O
College of Chemistry and Chemical Engineering, Qiqihar University Qiqihar Heilongjiang 161006 P. R. China.
Center of Inspection and Testing, Qiqihar Administration for Market Regulation Qiqihar Heilongjiang 161006 P. R. China
RSC Adv. 2022 Jun 28;12(29):18784-18793. doi: 10.1039/d2ra01236g. eCollection 2022 Jun 22.
Hg is one of the most toxic chemical species in the water environment, and thus developing a new fluorescent covalent organic framework for both the detection and removal of Hg is highly desirable. Herein, a fluorescent composite, termed TpPa-1 COF@CDs, was synthesized by inverse emulsion polymerization method using an imine covalent organic framework as the supporting material and carbon dots as the fluorescent sensor element. The crystallinity, porosity, rich functional receptors (hydroxyl and amino groups), thermal stability and fluorescent properties of TpPa-1 COF@CDs were characterized. The results showed that TpPa-1 COF@CDs exhibited a good detection and removal performance for Hg, which was evidenced by its high sensitivity (LOD = 0.75 μg L), superior selectivity, large adsorption capacity (235 mg g), fast adsorption rate (30 min equilibrium time) and good regeneration (at least five cycles). More importantly, the simple functional monomer, short reaction time and metal-free raw material made TpPa-1 COF@CDs reliable, cost effective and eco-friendly. This research demonstrated the facile construction of a functional covalent organic framework composite for water environmental remediation technologies of metal pollution.
汞是水环境中毒性最强的化学物质之一，因此开发一种用于检测和去除汞的新型荧光共价有机框架非常必要。在此，通过反相乳液聚合法，以亚胺共价有机框架为支撑材料、碳点为荧光传感元件，合成了一种名为TpPa-1 COF@CDs的荧光复合材料。对TpPa-1 COF@CDs的结晶度、孔隙率、丰富的功能受体（羟基和氨基）、热稳定性和荧光性质进行了表征。结果表明，TpPa-1 COF@CDs对汞具有良好的检测和去除性能，其高灵敏度（检测限 = 0.75 μg/L）、卓越的选择性、大吸附容量（235 mg/g）、快速吸附速率（平衡时间30分钟）和良好的再生性（至少五个循环）证明了这一点。更重要的是，简单的功能单体、短反应时间和无金属原料使TpPa-1 COF@CDs可靠、经济高效且环保。本研究展示了一种用于金属污染水环境修复技术的功能性共价有机框架复合材料构建方法的简便性。
