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3 Nanoparticles
Published in Odireleng Martin Ntwaeaborwa, Luminescent Nanomaterials, 2022
S.J. Mofokeng, F.V. Molefe, L.L. Noto, M.S. Dhlamini
There are three crystallophic phases of zinc titanite compounds, originating from ZnO-TiO2 composites. The two phases with a cubic structure are Zn2Ti3O8 and Zn2TiO4, and the third one with both hexagonal and cubic structure is ZnTiO3 [14]. As mentioned above, ZnTiO3 is a perovskite structure which has important applications in the electronic industry as dielectric ceramic, bioimaging, photon catalysis, and light emitting diodes owing to its exceptional luminescence properties due to many oxygen vacancies [14, 15]. In our study, the compound was doped with up- and downconverting (RE3+) ions, to convert unabsorbed solar spectra to absorbable spectra by dye sensitized solar cells. The polymorphs of zinc titanate are commonly produced from a combination of ZnO and TiO2 materials at high temperatures. At lower synthetic temperatures, the cubic Zn2Ti3O8 phase is formed. By further annealing the ZnO-TiO2 compound at higher temperatures, the ZnTiO3 perovskite is formed at temperatures T < 900°C. At annealing temperatures T > 900°C, the ZnTiO3 decomposes into Zn2TiO4 phase [14].
Antimicrobial Activity of Nanosized Photocatalytic Materials
Published in Devrim Balköse, Ana Cristina Faria Ribeiro, A. K. Haghi, Suresh C. Ameta, Tanmoy Chakraborty, Chemical Science and Engineering Technology, 2019
Rakshit Ameta, Monika Trivedi, Jayesh Bhatt, Dipti Soni, Surbhi Benjamin, Suresh C. Ameta
Stoyanova et al.47 synthesized nanosized ZnTiO3 powders using aqueous and nonaqueous sol–gel methods. Zinc acetate and titanium ethoxide were employed as starting materials for the preparation of zinc titanate by aqueous route. Nano-ZnTiO3 powder was also synthesized by a nonaqueous route reaction among TiCl4, ZnCl2, and benzyl alcohol at moderate temperatures. ZnTiO3 powders showed photocatalytic activity in the degradation of malachite green under UV-light illumination. The bactericidal activity of ZnTiO3 was also studied against E. coli bacteria.
ZIF-based zinc titanate composite as sufficient sorbent for removal of Congo red from aqueous solutions
Published in Journal of Asian Ceramic Societies, 2020
Taybeh Farahmand, Saeedeh Hashemian, Ali Sheibani
Dyes are generally present in the effluents of textile industries. Zinc titanate and Zinc titanate @ ZIF successfully synthesized by a simple method. The nano particles characterized by FTIR, SEM, TEM, BET and XRD methods. The results of SEM and TEM images showed formation of nano size particles. Zinc titanate and Zinc titanate @ ZIF examined as potential adsorbent for removal of CR from aqueous solution. Nano-sized zinc titanate @ ZIF had a tendency to adsorption of CR dye. The adsorption of CR was found to be dependent on contact time, pH and adsorbent dosage.CR was removed at contact time 60 min and 10 min for zinc titanate and zinc titanate @ ZIF, respectively, at pH 6. The kinetic data of CR sorption are in a good agreement with pseudo second order kinetic model. The adsorption of CR onto zinc titanate@ZIF was spontaneously and endothermic in nature. The Langmuir isotherm model followed adsorption of CR dye on synthesized samples. Zinc titanate @ ZIF sorbent was reused successfully.