Synthesis and shaping of Zr-UiO-66 MOF applicable as efficient phosalone adsorbent in real samples

Abstract

The development of versatile and effective adsorbents to eliminate organophosphorous pesticides from irrigation tail water is of special importance. The performance of the UiO-66-based metal–organic framework (UiO-66 MOF) for phosalone elimination from the real samples was evaluated. Characterization of the constructed MOFs was carried out by FT-IR, 31P NMR, TGA, BET, XRD, and SEM techniques. To elevate the adsorption ability of the UiO-66 MOF, as-synthesized material was chemically activated and then extruded (AE UiO-66 MOF). The phosalone adsorption on the AE UiO-66 MOF was investigated using UV–Vis, FT-IR, and 31P-NMR spectroscopy techniques. The influence of variables such as pH, sorbent amount, time period, and initial phosalone concentration were evaluated, and optimized conditions were determined to reach the desired performance. The kinetic study indicated a pseudo-second-order kinetic behavior for the phosalone adsorption by sorbent, which was fitted well to the Langmuir isotherms. The applicability of the AE UiO-66 MOF for phosalone adsorption in lentil, red bean, corn, tomato juice, and tap and river water was evaluated with satisfactory results (relative recovery = 84–96 %).