Abstract
Most traditional methods are only used to remove free oil from wastewater, and they are not efficient for separating oil-water emulsions. The adsorption separation process can be widely applied for the treatment of emulsions, mainly due to the cost and benefit of the process and the wide variety of materials that can be used as adsorbents, for example activated carbon, clays, zeolites, etc. Among the various types of porous materials called "Metal Organic Frameworks" (MOFs) are the zeolitic imidazolate (ZIFs) structures. The zeolitic structure of the ZIFs allows to exhibit high surface areas and thus to be promising adsorbents. To evaluate the adsorption capacity of ZIF-8 in the removal of emulsified oil, ZIF-8 was synthesized using Zn metal and as organic binder 2-methylimidazole (Hmim), dissolved in methanol at room temperature. ZIF-8 was characterized by X-ray diffraction (XRD) technique to determine the crystalline structure. To evaluate the capacity of the emulsified oil, a pH-influence test and chemical kinetics were determined. The best pH of the emulsion for removal was pH 6. The chemical kinetics performed at pH 6 presented the best fit with the pseudo-second model with correlation coefficient 0.93. According to the kinetic data, a removal percentage of 92.43% was found with only 30 min of removal.
Highlights
As oily wastewater, they are identified as oily effluents, are a class of generalized pollutants from various types of sources that have a major impact on the environment (Tian et al, 2019)
It was observed that the diffraction patterns of the metalorganic structure of ZIF-8 agree with the reference patterns from the data of the ZIF-8 structure published (Park et al, 2006), this shows that the synthesized material is highly crystalline and without impurities
3.2 Influence of pH The pH value of the aqueous solution plays an important role in the emulsion oil/water adsorption
Summary
They are identified as oily effluents, are a class of generalized pollutants from various types of sources that have a major impact on the environment (Tian et al, 2019). In addition to being toxic, oily wastewater contains petroleum hydrocarbons, phenols and poly aromatic hydrocarbons that can slow the growth of animals and plants. As for humans, this pollutant generates risks of mutations and cancers (Ismail et al, 2020). Oils in wastewater can be found in different forms free, emulsified and dispersed (Pintor et al, 2016). The emulsified oil has particles smaller than 20 μm in diameter and the drops are stabilized by the chemical action of surface agents (Pintor et al, 2016). Emulsions are more difficult to treat due to their high stability in the aqueous phase (Wahi et al, 2013)
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