Nashrieh Shimi va Mohandesi Shimi Iran

Nashrieh Shimi va Mohandesi Shimi Iran

Optimization of the Performance of LaMO3 (M: Mn, Fe, Co & Ni) Nanocatalysts in the Advanced Oxidation of Ciprofloxacin Pharmaceutical Pollutants Using Response Surface Methodology

Document Type : Research Article

Authors
1 Department of Inorganic Chemistry, Faculty of Chemistry, University of Kashan, Kashan, IR. IRAN
2 Department of Applied Chemistry, Faculty of Chemistry, Kashan University, Kashan, IR. IRAN
Abstract
In this research, lanthanum perovskite nanocatalysts with some transition metals LaMO3 (M: Mn, Fe, Co & Ni) by sol-gel method with two different complexing agents citric acid and cetyltrimethylammonium chloride were prepared Characterization of perovskite nanostructures prepared by X-ray diffraction (XRD), scanning electron microscope (SEM), X-ray energy diffraction spectroscopy (EDS), dynamic light scattering (DLS), nitrogen absorption and desorption by Blair method - Emmett-Taylor (BET) were performed. The XRD results showed that the perovskites prepared in the presence of citric acid had a more perfect crystal structure. SEM and EDS analysis confirmed the nano structure and uniform distribution of elements in perovskite, and also DLS analysis showed that the largest size distribution of perovskite particles examined in the fluid medium is between 100-500 nm. The performance of the prepared nanostructures in the degradation of ciprofloxacin in the presence of the oxidant potassium persulfate was investigated. The perovskite nanocatalyst LaCoO3 prepared in the presence of citric acid had the highest percentage of ciprofloxacin degradation (71%). With the aim of modeling the effect of some operating variables and optimizing the degradation percentage on the optimized LaCoO3 catalyst, the experiment was designed with the response surface method (RSM). The results of the analysis of variance (ANOVA) and the regression coefficient of the obtained model (R2) indicated the significance of the modeling. The highest pollutant degradation percentage on the selected catalyst was predicted to be 97.69%, which will be achieved at a temperature of 47.77°C, pH equal to 7.17, nanocatalyst mass 0.12 grams and potassium persulfate mass 0.28 grams. The result of the laboratory conducted under these conditions was also very close to the result predicted by the model.
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