Studies of Tow MOFs in their ion sensitivity and dyes absorption

Abstract

Nowadays, coordination polymers (CPs), especially metal-organic frameworks (MOFs), has becoming the focus because of their rich structures and extensive applications in detecting, absorbing, also as electrode materials [1-2]. It is well known that waste water contains metal ions and dyes and other harmful substances, which would damage the environment, affect the balance of ecological environment [3]. Therefore, it is particularly important to prepare materials with detection and adsorption properties.
In this work, 4- (2-carboxyvinyl) benzoic acid was selected to react with Cd(II) and Zn(II) by hydrothermal method to synthesize complexes 1 and 2. Fluorescence sensing results show that complex 1 have high recognition and selectivity for Fe3+, CrO42-, and Cr2O72-with high quenching constants (Ksv) and lower detection limits (LOD). In the test of dye adsorption properties, complex 2 shows the ability to adsorb MG dyes with its adsorption amount about 0.00316 mmol·g-1 in 10 mg complex 2.
In a word, these two MOFs can be used as excellent materials in detecting and removing harmful substances in water.