Dual-Functionalized Fluorescent Cationic Organic Network: Highly Efficient Detection and Removal of Dichromate from Water

作者：Zhi Jun Li, Hua‐Dong Xue, Yun‐Xiang Ma, Qi Zhang, LI Yan-chun, Miao Xie, Huili Qi, Xudong Zheng · 发表于：ACS Applied Materials & Interfaces · 年份：2019 · DOI：10.1021/acsami.9b17074 · 被引用次数：47 · 研究领域：Metal-Organic Frameworks: Synthesis and Applications、Molecular Sensors and Ion Detection、Advanced Nanomaterials in Catalysis

Dichromate is a widespread contaminant in wastewater, threatening the health of humans and other organisms. Therefore, effective detection and removal of dichromate from water is of great significance. Herein, a tetraphenylethylene functionalized cationic organic network ( CON-LDU2 ) was constructed via a facile quaternization reaction. CON-LDU2 was successfully integrated with both detection and removal functionalities toward dichromate. On the one hand, benefiting from the strong fluorescence, CON-LDU2 was employed as a chemosensor, it could efficiently and selectively probe Cr 2 O 7 2– in water with “turn-off” fluorescent response. On the other hand, the cationic skeleton and free anions inside framework make CON-LDU2 an excellent adsorbent for Cr 2 O 7 2–, it could capture Cr 2 O 7 2– from water with rapid kinetics and high capacity. The kinetic constant for adsorption of Cr 2 O 7 2– can reach up to 1.784 g mg –1 min –1, while the capacity is determined as 325 mg g –1 . Furthermore, CON-LDU2 displayed good recyclability and can be reused for at least 5 cycles. Therefore, CON-LDU2 can serve as an ideal candidate not only in detection but also in removal of Cr 2 O 7 2– in water medium.