Preparation of the extruded UiO-66-based Metal-Organic Framework for the diazinon removal from the real samples

Abstract

An adsorbent was introduced for the diazinon (DIZ) adsorption and removal from real samples. A mixture of the activated metal-organic framework (MOF) and a binder was used as an efficient adsorbent. Tetra(4-Sodium sulfonatophenyl)porphyrin was used as a complexing agent to investigate the spectrum of DIZ in Ultraviolet–visible spectroscopy (UV–Vis). The structural properties of the prepared adsorbent were studied by FT-IR, SEM, XRD, TGA, 31P NMR, and BET methods. To achieve the best efficiency of the DIZ adsorption and removal by the active-shaped Metal-Organic Framework (AE-MOF UiO-66), various practical factors such as pH effect, amount of adsorbent, contact time, and the concentration of the solution specimen were optimized. Under optimized conditions, the linear dynamic range for DIZ determination was 10–500 ng/mL with a limit of detection (LOD) of 2.5 ng/mL. The relative standard deviations (RSD%, n = 5) was 3% for the determination of 30.4 ng/mL of DIZ. The study of the adsorption kinetics demonstrated that the rate of DIZ adsorption by AE-MOF UiO-66 correlates well with the pseudo-second-order model. The monolayer adsorption of the DIZ molecules on the AE-MOF UiO-66 surface fits well with the Langmuir isotherm model. A green AE-MOF UiO-66-based adsorbent with a high adsorption capacity was developed for DIZ adsorption and removal from the real specimens.