Synthesis of boron and zirconium co-doped titanium dioxide nanopowders by the sol-gel technique /

Ağartan, Lütfi
Effects of water/Ti precursor molar ratio (R ratio) and calcination regime on the photocatalytic properties of undoped, boron (B) doped, zirconium (Zr) doped, and B and Zr co-doped TiO2 powders synthesized by sol-gel process were researched. Undoped powders were synthesized for R ratio of 1, 3, 5, 10, 30, and 50 while doped and co-doped powders were synthesized for R ratio of 50. Undoped powders were calcined at 300, 400, and 500oC for 1, 2, and 3 h while doped and co-doped powders were calcined at 300 and 500oC for 1 h. X-ray diffraction analysis indicated that doped and undoped powders composed of only anatase crystals, except the undoped powders synthesized for low R ratio calcined at 500oC. Rietveld analyses suggested that B and Zr were successfully doped into the crystal structure of TiO2 and changed the lattice parameters. Scanning electron microscopy investigations revealed that all powders were in the range of 15 to 40 nm in size and were highly agglomerated. Diffuse reflectance spectroscopy measurements showed that all powders had band gap energy of around 3.2 eV and their reflectance could be shifted to visible light region of the electromagnetic spectrum. Upon B and Zr co-doping better methylene blue degradation was achieved in UV light and daylight. The improvement in photocatalytic performance due to co-doping was attributed to the changes in structural and morphological features.


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The aim of this study was to synthesize magnetic Fe3O4 chitosan nanoparticles (m-Fe3O4-CNs) by ionic gelation method and use them as adsorbent for the removal of Bromothymol Blue (BB) from aqueous solutions. Also, the effect of various parameters on the preparation of m-Fe3O4-CNs was investigated in this study. The nanoparticles were characterized by transmission electron microscopy (TEM), scanning electron microscopy (SEM), dynamic light scattering (DLS), Fourier transform infrared (FTIR) spectroscopy and ...
Interaction of ADN with some group II and III elements
Türker, Burhan Lemi (2016-11-01)
Ammonium dinitramide (ADN) has been studied quantum chemically at the level of UB3LYP/6-31++G(d,p) in order to get some information about its behavior in the presence of some group II and III elements (viz., Be, Mg, B and Al). The results indicate that Be and Mg are being oxidized by AND, but B and Al are not. In the case of Be and Mg, the reduction of ADN is accompanied by the removal of NO2 moiety which has negative total charge. On the other hand, the interaction pattern of these elements with dinitramic...
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Ertas, M; Çırpan, Ali; Toppare, Levent Kamil (Elsevier BV, 2004-05-07)
A new dipyrrolyl monomer was synthesized via the reaction between 4-pyrrol-1-yl phenol and butanedioyl dichloride. Electrochemical behavior of this monomer, succinic acid bis-(4-pyrrol-1-yl-phenyl) ester (SM) was studied. Homopolymerization was achieved by chemical and constant Current electrolysis methods. Copolymerization of SM with thiophene was performed by constant potential electrolysis in acetonitrile (AN)-tetrabutylammonium tetrafluoroborate (TBAFB) and dichloromethane (DCM)-TBAFB, solvent-electroly...
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A new compound consisting of 2-thienyl units linked by polyether bridge has been synthesized and its electrochemical polymerization was performed via constant potential electrolysis (CPE) in an electrolytic solution containing 0.1 M tetrabutylammonium hexafluorophosphate (TBAPF(6)) dissolved in CH3CN. Chemical polymerization was carried out using FeCl3 as oxidizing agent. It is found that both methods gave the same polymer product without any cleavage of the polyether bridge between thiophene (Th) rings. Al...
Citation Formats
L. Ağartan, “Synthesis of boron and zirconium co-doped titanium dioxide nanopowders by the sol-gel technique /,” M.S. - Master of Science, Middle East Technical University, 2014.