Structural Design of Low Toxicity Metal–Organic Frameworks for Multifunction Detection of Organic and Inorganic Contaminants from Water
Shuang Gai, Ruiqing Fan, Jian Zhang, Jiakai Sun, Pengxiang Li, Ziqi Geng, Xin Jiang, Yayu Dong, Jiaqi Wang, Yulin Yang
Abstract
Metal–organic frameworks (MOFs)-based sensors for monitoring toxic substances in wastewater have attracted great attention due to the efficient and reliable performance. Here, we has synthesized two novel zinc-based MOFs [Zn(ttb)2(H2O)2]n (Zn1-ttb) and {[Zn(ttb)2]·0.5CH3CN}n (Zn2-ttb) through changing the polarity of reaction solvents and finally obtained target 2D MOF material [Zn(ttb)(bdc)0.5]n(Zn3-ttb-bdc) by successfully introducing an ancillary ligand H2bdc (Httb = 1-(triazo-1-ly)-4-(tetrazol-5-ylmethyl)benzene, H2bdc = 1,4-benzenedicarboxylic acid). As-prepared Zn3-ttb-bdc exhibits high water and chemical stability as well as excellent fluorescence property. Due to the −COOH binding sites from H2bdc, Zn3-ttb-bdc shows high sensitivity and a rapid luminescent response to a representative organic micropollutant trinitrophenol (TNP) and inorganic pollutants (Fe3+ and Cr2O72–) in wastewater. The mechanisms of multifunctional detection abilities of Zn3-ttb-bdc toward different types of pollutants are further studied. This work presents the structural design in preparing MOF materials for multifunctional detection performance, thus opening new perspectives for emerging MOF-based sensors as environmental monitors.