Introduction: The use of antibiotics in veterinary medicine and medical applications has increased widely and the possibility of contamination of water sources with such compounds has increased which causes adverse effects such as increased bacterial resistance and digestive disorders. Therefore, the aim of this study was to use the ultrasonic process with Fe-doped TiO2 nano-particle in the Removal of flumequine. Materials and Methods: The present study was an experimental-laboratory study conducted as a batch system. nanoparticles were synthesized by the sol-gel method and SEM, XRD, and DRS analyzes were used to determine the properties of nanoparticles. The effect of different variables including pH (3-11), initial concentration of flumequine (25-75 mg/L), and concentration of nanoparticles (200-600 mg/L) at different times (15-60 min) Was examined in sonocatalytic removal of flumequine. Results: The results of this study showed that the maximum removal efficiency of flumequine was 96. 5 % at pH 3, initial concentration of 25 mg/L, and a nanoparticle dose of 600 mg/L, a reaction time of 60 minutes was obtained using ultrasonic waves with a constant frequency of 35 kHz. Conclusion: Due to the high removal efficiency of sonocatalytic process, the use of this process for the removal of flumequine in water and wastewater treatment processes is recommended.

in this work, M-doped TiO2 nanostructures (M: Fe, Co and Ni) were synthesized by reverse microemulsion method. The as-prepared products were analyzed by different techniques such as scanning electron microscopy (SEM), Transmission electron microscopy (TEM), X-ray diffraction (XRD) and Fourier Transform Infrared Spectroscopy (FT-IR). The effect of various dopants (Fe, Co and Ni) on band gap and photocatalytic properties of TiO2 was investigated. The decolorization abilities of the asprepared M-TiO2 nanostructures (M = Fe, Co and Ni) under UV and visible irradiation were investigated using three dyes: Acid Red 1, Reactive Blue 21 and Indigo Carmine. The role of pH value and reaction time on photocatalytic performance of products was also studied. The results showed that the degradation of dyes in lower pH is more and photocatalytic performance Fedoped TiO2 is better than the others. Kinetic investigation of the photodegradation illustrated reactions were following the Langmuir-Hinshelwood mechanism. Prog. Color Colorants Coat. 11 (2018), 209-220© Institute for Color Science and Technology.

In this study, to improve the nanoparticle dispersion and increasing possible interaction between nanoparticle and polymeric matrix in the UP/TiO2 nanocomposite, the surface of the TiO2 nanoparticles was modified in the new approach; first the surface of TiO2 nanoparticles was modified by a coupling agent as 3-(methacryloxy) propyl trimethoxy silane and then polymerized in the presence of ethyl acrylate and methyl methacrylate monomers with AIBN as initiator. FTIR spectroscopy confirmed the presence of the coupling molecule and consequently copolymer macromolecular chains on the surface of TiO2 nanoparticles. Transmission electron microscopy (TEM) was used to study the morphology of the particles before and after the surface grafting. Mechanical properties and ultraviolet visible (UV/Vis) spectroscopy of various samples, including the doubly modified-TiO2 nanoparticles and the unmodified-TiO2 nanoparticles were also investigated. The results showed that surface remodification of TiO2 nanoparticles improve nanoparticles dispersion, mechanical properties and UV protection of the UP/TiO2 nanocomposite.

Nano photo-catalyst coatings, exposed to high-energy photons, have the ability to remove toxic organic compounds from gaseous and aqueous environments. But these coatings, due to lower surface area, are less efficient than nanoparticles. Microstructure of these coatings should be modified in order to improve their efficiency. In this study, nanostructured TiO2/Al2O3 heterogeneous films were synthesized by the sol-gel method. Quartz sheets were used as the substrates, and Al2O3 and TiO2 sols were, in turn, deposited on these substrates by the spin coating method, respectively. The deposited layers were sintered at 800oC and 500oC, respectively. Crystallization of gamma-alumina and anatase phases was confirmed by X-ray diffraction (XRD). The average crystallite size of the anatase films was measured to be about 30 nm by using scanning electron microscopy (SEM). UV-vis absorption spectroscopy was used to calculate the energy gap, and based on the measured absorption wavelengths; the total gaps were calculated to be 3.81 eV and 4.47 eV, for TiO2 and TiO2/Al2O3 layers, respectively. The emission spectra obtained by the photoluminescence analysis were used to confirm the oxygen vacancy formation. Our results showed that, by the addition of Al2O3, neutral oxygen vacancies may be thermodynamically stable stabilized in TiO2.

There are numerous applications of nanomaterials in catalysis, biosensing, biotechnology, electronics, magnetic fluids, energy storage and also in the biomedical field, especially in gene or drug delivery and diagnostics. Nanomaterials have amazing capabilities to stimulate neu ronal cells toward neuronal cell proliferation, neuronal cell adhesion, axonal growth, and neuroprotection. Researchers have demonstrated that nanomaterials can also differentiate stem cells into neuronal cells. Recently, the impact of nanomaterials on the proliferation and differentiation of normal, cancer, and stem cells have been investigated greatly. In this study, the effects of titanium dioxide nanoparticles (TiO2NPs) on the differentiation of neural stem cells are examined. Our findings indicate that TiO2 nanoparticles lead to differentiation tendencies biased towards neurons from neural stem cells, suggesting TiO2 nanoparticles might be a beneficial inducer for neuronal differentiation. We found that pheochromocytoma cell line (PC12 cells) exposed to TiO2, Au/TiO2, Ag/TiO2 nanoparticles significantly increased the differentiation of neural stem cells and promoted neurite outgrowth. Our data may have resulted from the stimulation of cell adhesion molecules that are associated with cell-matrix interactions through nanoparticle. The findings of this work proposes the use of the Ag/TiO2 nanoparticles which also have antibacterial and antioxidant characteristics, as a suitable method to improve Nerve Growth Factor (NGF) activity and efficacy, thus, opening the novel window for substantial neuronal repair therapeutics.