Photocatalytic activity of CuO nanoparticles incorporated in mesoporous structure prepared from bis(2-aminonicotinato) copper(II) microflakes
(1. Research Laboratory of Inorganic Materials Synthesis, Department of Chemistry,
Iran University of Science and Technology, Tehran 16846-13114, Iran;
2. Department of Physics, Sharif University of Technology, Tehran 11155-9161, Iran;
3. Institute for Nanoscience and Nanotechnology, Sharif University of Technology, Tehran 14588-89694, Iran)
Iran University of Science and Technology, Tehran 16846-13114, Iran;
2. Department of Physics, Sharif University of Technology, Tehran 11155-9161, Iran;
3. Institute for Nanoscience and Nanotechnology, Sharif University of Technology, Tehran 14588-89694, Iran)
Abstract: An easy method for preparing CuO nanoparticles incorporated in a mesoporous structure was presented based on the thermal decomposition of a copper complex. The novel copper coordination compound of [Cu(anic)2]·0.75H2O (anic=2-aminonicotinate) with the microflake morphology was synthesized through the reaction of 2-aminonicotinic acid (Hanic) and copper(II) nitrate. Using elemental analysis and Fourier transform infrared (FTIR) spectroscopy, the chemical composition of CuC12H11.5N4O4.75was proposed. Calcination process at 550 °C for 4 h transformed the microflakes into CuO nanoparticles incorporated in a mesoporous structure. The FTIR peaks assigned to 2-aminonicotinate were completely removed after calcination, confirming CuO formation. X-ray diffraction (XRD) analysis also confirmed the generation of pure and crystalline CuO. SEM showed CuO nanoparticles with the average diameter of 75 nm. The diffuse reflectance spectrum (DRS) of the CuO nanoparticles showed a band gap energy of ~1.58 eV. The degradation efficiency toward rhodamine B was almost 100 % after 5 h illumination when both CuO and H2O2 were utilized. The results show that the product can be used as an efficient photocatalyst for water treatment.
Key words: copper oxide; nanostructure; 2-aminonicotinic acid; photocatalyst; thermal decomposition; degradation efficiency