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Abstract
Transition metal (Mn, Fe, Co,) doped TiO2nanoparticles were synthesized by the sol-gel method. All the prepared samples were calcined at different temperatures like 200°C to 800°C and characterized by X-ray diffraction (XRD) and energy dispersive X-ray (EDX) analysis. The studies revealed that transition metal (TM) doped nanoparticles have smaller crystalline size and higher surface area than pure TiO2. Dopant ions in the TiO2structure caused significant absorption shift into the visible region. The results of photodegradation of formaldehyde in aqueous medium under UV light showed that photocatalytic activity of TiO2nanoparticles was significantly enhanced by the presence of some transition metal ions. Chemical oxygen demand (COD) of formaldehyde solutions done at regular intervals gave a good idea about mineralization of formaldehyde.
Highlights
Titanium dioxide is one of the most efficient photocatalysts for degradation of azo dyes
Its complex effects by different ions and their lower atomic % concentration levels are still not clearly elucidated. As part of such continued efforts, this research has studied the doping behaviors of three metal ions with their atomic concentration levels of 1%–4% at % on crystal phase, particle sizes, X-ray diffraction (XRD) patterns, and photoreactivity of TiO2 nanoparticles
XRD studies of the transition metal (TM) doped TiO2 materials were performed in the Rigaku Miniflex-II Desktop XRD diffractometer coupled to a Cu X-ray tube, the Cu-Kα wavelength of which was selected by means of the nickel filter
Summary
Titanium dioxide is one of the most efficient photocatalysts for degradation of azo dyes. In order to enhance the photocatalytic activity of TiO2, interfacial charge-transfer reaction should be increased and electron-hole recombination decreased by modifying the properties of TiO2 colloids [3, 4]. A dopant ion may act as an electron trap or hole trap This would prolong the life-time of the generated charge carriers, resulting in an enhancement in photocatalytic activity [8]. Its complex effects by different ions and their lower atomic % concentration levels are still not clearly elucidated As part of such continued efforts, this research has studied the doping behaviors of three metal ions with their atomic concentration levels of 1%–4% at % on crystal phase, particle sizes, XRD patterns, and photoreactivity of TiO2 nanoparticles. The effect of dopant concentration on degradation of formaldehyde was investigated in order to contribute to understanding of enhancing their environmental application
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