Title:Zeolitic Imidazolate Framework ZIF-ZNI Nanocrystals used for Oil-water
Separation
Volume: 7
Issue: 1
Author(s): Patrícia Fernandes Tomaz, Diogo Pierre Alves Rodrigues, Tellys Lins Almeida Barbosa and Meiry Glaucia Freire Rodrigues*
Affiliation:
- Development Laboratory of New
Materials, Academic Unit of Chemical Engineering, Federal University of Campina Grande, Campina Grande, Brazil
Keywords:
Metal-organic frameworks, polymorphism, nanotechnology, lubricant oil, emulsion, demulsification.
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 nano adsorbent in the oil removal from the 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. Oilwater
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.