Zeolitic Imidazolate Framework ZIF-ZNI Nanocrystals used for Oil-water Separation

Abstract

Background: The oil removal from industrial effluents is one of the biggest problems faced in the world. It is a very important environmental issue and it is necessary to solve this problem. In this sense, ZIFs are increasingly important in the environmental area. Objective: This work reports a method for the synthesis of ZIF-zni nanocrystals, at room temperature in 1 h, and a performance of the ZIF-zni nanoadsorbent in the oil removal from oil-water emulsion. Methods: ZIF-zni was produced from the solvothermal method and it was characterized by X-ray diffraction, electron microscopy, contact angle, infrared spectroscopy and thermogravimetry. Oil-water emulsion was produced by lubricant oil and distilled water. Batch-type adsorption at 200 rpm for 2 h was used to evaluate the potential of ZIF-zni for the separation of the oil-water emulsion with initial oil concentration (100, 300 mg/L) and temperature (30, 60 °C). Results: The characterizations showed that the crystalline phase of ZIF-zni was successfully obtained. The ZIF-zni exhibit a very high removal percentage (above 95 %) and adsorption capacity. The predictions of multiple linear regression models determined based on the factorial design of experiments are excellent. Conclusion: The value up to 2879 mg/g of adsorption capacity was reached, thus indicating that the use of the nanoadsorbent ZIF-zni has great potential in the process of separating oil-water emulsion.

Oil removal from oil/water emulsion by Zeolitic Imidazolate Framework-8 (ZIF-8): A study of pH, and adsorption kinetic

“…Our research group has published some papers on the production of adsorbents and zeolite membranes for separation oil/water and ZIF-8 Barbosa, Barbosa, & Rodrigues, 2015;Scheibler et al, 2014;Barbosa et al, 2020;Barbosa, Barbosa, & Rodrigues, 2015). In addition, a series of studies were developed in the preparation of ZIFs and various applications (Barbosa, 2019;Tomaz, 2020;Tomaz et al, 2021;Rodrigues, 2021).…”