Stable In(III)-Based Metal–Organic Frameworks for Selective Detection of 4-Nitroaniline and Antibiotics in Water
Ziqing Zhang, Zhiyuan Wu, Zhijia Li, Yunfang Zhao, Muxin Yu, Feilong Jiang, Lian Chen, Maochun Hong
Abstract
Detection of harmful chemical reagents and pollutants is of great significance for protecting human health and environmental sustainability. In this work, a 3D metal–organic framework, named In-BTDI, has been synthesized, featuring a two-fold interpenetrated framework. In-BTDI shows intense luminescence with the emission peak at 502 nm and exhibits high structural and photo-stability in water and common organic solvents, which provides a good foundation to be unitized as a chemical sensor. In-BTDI can selectively and sensitively sense 4-nitroaniline (4-NA) and antibiotics by the fluorescence quenching effect not only in the organic solvent but also in water. It is noteworthy that the limits of detection (LOD) of 4-NA and antibiotics in water are 240 and 202 ppb, respectively, both reaching a ppb level, suggesting the good detection ability of trace analytes in water. The sensing mechanism was then discussed in detail.