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Diaqua oxalato strontium(II) complex as a precursor for facile fabrication of [email protected]3, characterization, optical properties, morphological studies and adsorption efficiency

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Diaqua oxalato strontium(II) complex [Sr(C2O4)(H2O)2] was prepared via a precipitation reaction. Thermal treatment of the as-synthesized precursor at 550 °C resulted in formation of strontium carbonate (SrCO3) nanocrystals. A new composite of silver nanoparticles decorated with strontium carbonate ([email protected]3) was fabricated by heating a mixture of silver oxalate and strontium carbonate in air at 150 °C for 2 h. The spectral, morphological and thermal properties of the materials have been studied using different physicochemical techniques such as X-ray diffraction (XRD), scanning electron microscopy (SEM) with energy dispersive X-ray spectroscopy (EDX), high-resolution transmission electron microscopy (HR-TEM), Fourier infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), diffrential scanning calorimetry (DSC) and thermal gravimetric analysis (TGA). From the Debye–Scherrer equation the calculated particle size of Sr(C2O4)(H2O)2], SrCO3 and [email protected]3 are 62.1, 58.7, and 58.5 nm, respectively. The SEM and TEM images indicate tetragonal structure of [Sr(C2O4)(H2O)2] while SrCO3 and [email protected]3 appeared as cubic structures. The calculated energy band gap of SrCO3 and [email protected]3 using the Tauc equation are estimated at 5.9 and 4.7 eV, respectively. The adsorption capacity of the materials is tested for the adsorption of Congo red anionic dye and exhibited promising results. The adsorption capacity followed the order [email protected]3>SrCO3> [Sr(C2O4)(H2O)2] with efficiencies of 73.90, 67.55, and 60.50%, respectively.
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Keywords: Congo red; Strontium; band gap; silver decorated; thermal treatment

Document Type: Research Article

Affiliations: 1: Chemistry Department, College of Science, Jouf University, Sakaka, Saudi Arabia; 2: Electronic and Magnetic Materials Department, Advanced Material Division, Central Metallurgical Research and Development Institute (CMRDI), Cairo, Egypt; 3: College of Environmental Science and Engineering, North China Electric Power University, Beijing, PR China;

Publication date: April 3, 2019

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