DOI: 10.35208/ert.1527049 ISSN: 2636-8498

Incorporation of Zirconium-Based Metal-Organic Framework on Kaolin for Boosting Rhodamine-B Adsorption

Nergiz Kanmaz
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This research was focused on the use of a zirconium-based metal-organic framework (UiO-66) supported kaolin composite (UiO-66@kaolin) for rhodamine-b (RB) adsorption. The proposed composite was prepared via solvothermal method, and the functional groups were characterized by FT-IR analysis. The adsorption performances of kaolin and UiO-66@kaolin were compared by equilibrium experiments and the maximum monolayer adsorption capacities calculated from the Langmuir model were found to be 2.10 mg g⁻¹ and 17.22 mg g⁻¹, respectively. It was observed that the adsorption capacity of pristine kaolin was significantly increased by UiO-66 support. Besides, kaolin mineral was fitted to the monolayer Langmuir isotherm model, while the isotherm character of the composite adsorbent was described by the multilayer model Freundlich. The equilibrium time for UiO-66@kaolin was obtained as 240 min and the adsorption process was identified to occur via chemisorption with pseudo-second-order model fitting. It was observed that RB removal rate decreased with decreasing pH and solution pH had a major effect on adsorption. The parameters gathered from thermodynamic data demonstrated that RB adsorption was exothermic and spontaneous. The effective removal of RB dye from wastewater systems using the prepared UiO-66@kaolin composite adsorbent was confirmed by extensive adsorption studies. The reported findings may inspire further potential investigations.

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