Synthesize optimization, characterization, and application of ZIF-8 adsorbent for elimination of olive oil from aqueous
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RESEARCH ARTICLE
Synthesize optimization, characterization, and application of ZIF-8 adsorbent for elimination of olive oil from aqueous solution Maedeh Anisi 1 & Ali Asghar Ghoreyshi 1
&
Elaheh Mehrvarz 1 & Ahmad Rahimpour 1
Received: 3 June 2020 / Accepted: 15 October 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract In view of the importance of water quality and environmental aspect, zeolitic imidazolate framework-8 (ZIF-8) adsorbent was synthesized via a solvothermal approach for oil removal from water. Response surface methodology-central composite design approach (RSM-CCD) using a statistical software (Design expert, version 8.0.6) was employed to identify the influence of three independent variables of ZIF-8 synthesis procedure including ligand/salt molar ratio, solvent/salt molar ratio, and synthesis temperature on the oil adsorption capacity and yield of adsorbent as RSM responses. The optimum conditions for preparing ZIF-8 were found as follows: ligand/salt molar ratio of 10.4, solvent/salt ratio of 702.7, and temperature of 52.9 °C, which resulted in 1120 mg/g of olive oil uptake and 43% of ZIF-8 yield. Morphological and structural properties of the prepared adsorbent were characterized by N2 adsorption-desorption, XRD, FE-SEM, and FTIR analyses. Batch equilibrium adsorption experiments were conducted under varied system parameters expected to affect the ZIF-8 adsorption capacity including oil concentration, ZIF-8 dosage, contact time, and temperature. The isotherm and kinetic of olive oil adsorption onto ZIF-8 followed the Freundlich and pseudo-first-order models, respectively. The evaluation of thermodynamic parameters demonstrated that olive oil adsorption onto optimized ZIF-8 was spontaneous and exothermic in nature. In addition, the used ZIF-8 can be recovered effectively using a simple ethanol-washing method. Based on experimental results, the ZIF-8 prepared in this study can be successfully used in oil/water emulsion separation. Keywords Adsorption . ZIF-8 . Olive oil . Emulsion . Response surface methodology . Oil/water emulsion
Introduction Water as a critically important component is necessary for vital activities of living beings on the earth. Unfortunately, the quality of surface and ground water reservoirs is deteriorating day by day via continuous addition of unfavorable materials in them (Ali 2012). In general, the water pollutants may be categorized as chemical (organic and inorganic) and biological in nature. Oils as organic pollutants in water have hazardous and
Responsible Editor: Tito Roberto Cadaval Jr Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11356-020-11283-0) contains supplementary material, which is available to authorized users. * Ali Asghar Ghoreyshi [email protected] 1
Chemical Engineering Department, Babol Noshirvani University of Technology, Babol, Iran
irreparable effects on the environment and ecosystem (Li et al. 2017). Olive oil production is an important agriculture and economic
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