Bismuth vanadate is one of the most widely used semiconductors for photoelectrochemical water splitting using sunlight due to its activity in the presence of visible light, stability, and cost-effectiveness. In addition to having a suitable band gap, this semiconductor has disadvantages such as high electron-hole recombination. In this research, with the aim of reducing electron-hole recombination and increasing the efficiency of bismuth vanadate photoelectrodes, templated mesoporous titanium dioxide prepared by P123, F127, and Brij 58 copolymers were used. The effect of three and two-block copolymers on the properties of prepared mesoporous synthesized titanium dioxide and their effect on the bismuth vanadate photoelectrode was investigated by FE-SEM, XRD, UV-vis, and BET analyses. These copolymers changed the porosity by creating cavities of different sizes, resulting in different loads of bismuth vanadate on titanium dioxide. To evaluate the photoelectrochemical results, LSV and electrochemical impedance spectroscopy were performed on the photoelectrodes. Absorption in the visible region showed an increase in current at a potential of 1.23V vs RHE and a low charge transfer resistance in Meso TiO2 / BiVO4 samples. The results showed that the templated mesoporous titanium dioxide increases the activity of bismuth vanadate up to 2.5 times.

Increasing use of dyes and pollution with containing dyes is one of the major environmental problems and, various methods for the treatment of effluents containing dyes have been investigated. In this study, TiO2, CoFe2O4 and TiO2/CoFe2O4 nanofibers were prepared using electrospinning process and the effect of voltage and electrospinning distance on the diameter and morphology of nanofibers were investigated. Samples of prepared nanofiber were used as adsorbents for decolonization of effluents containing direct and red 80 dyes. The effect of various parameters such as the content of adsorbent, dye concentration and pH on the decolonization efficiency was investigated. Structural and optical properties of prepared nanofibers were characterized by scanning electron microscopy (SEM), X-ray diffraction pattern (XRD), specific surface determination test (BET) and, UV-Vis spectroscopy has been used to study the adsorption of dyes. The obtained SEM images showed that the average diameter of all three prepared nanofiber samples of TiO2, CoFe2O4 and TiO2 / CoFe2O4 is less than 100 nm. The results of XRD show that the nanostructures prepared after heat treatment have a structure with a crystalline dominant phase. BET results show that the dye degradation rate k in TiO2/CoFe2O4 nanofibers is 93.45 (ppm/h), which is much better than the other two nanofibers. The results show that the dye degradation efficiency of TiO2/CoFe2O4 nanofibers was much better than TiO2 and CoFe2O4.

Introduction: Diazinon is an organophosphate pesticides that widely used for agricultural pests and vectors. Diazinon resists to biodegradation so there is major concern about it. The aim of present work was to study the decompostionof diazinon by nano-photocatalytic ZnO-TiO2 in the presence of UVC radiation.Materials and Methods: This work is a laboratory-experimental study. Characterization of nanoparticles was determined through TEM pattern. The number of samples was determined by Taguchi statistical method. The samples with definite concentration of diazinon and nanopartical in different operational conditions were exposed to UVC radiation, individually .Diazinon concentration was measured using HPLC. Data analysis was performed using the software Minitab 16.Results: The results showed that with increasing reaction time, the removal of diazinon increases but by increasing the dose of nanoparticles and Diazinon concentration the removal rate decreases. The highest removal efficiency rate was 95%.Conclusion: The combination of catalysts is a new method for the removal of diazinon. The results showed that the photocatalytic nano-ZnO-TiO2 has a positive effect on diazinon degradation.

This paper studies the structural, optical and ultraviolet photodetection of rutile titanium dioxide nanorods (TiO2). A regular array of relatively vertically aligned TiO2 nanorods has been grown on fluorine doped tin oxide (FTO) coated glass substrate by using one step hydrothermal synthesis method. The morphology and crystal structure were studied by scanning electron microscopy and X-ray diffraction, respectively. Photoluminescence (PL) and diffuse reflectance spectroscopy were used as experimental methods for band gap energy estimation of nanostructures. The room temperature Photoluminescence spectra were measured under two different excitation energies of 4. 13 and 3. 82 eV. The results indicate the dependence of the PL spectrum to excitation energy. Thus, the band gap energy of nanorods is approximately equal to 3. 04 eV and observed in the PL spectrum under 4. 13 eV excitation energy. Comparing the applied reported methods for calculating the band gap energy by using diffuse reflectance spectra and Kubelka-Munk method shows that the most relevance to PL data exist with application of equation. The ultraviolet photodetection performance of TiO2 nanorods in Au/TiO2/Au device structure under 365 nm illumination is evaluated by determining resposivity, sensivity and rise and decay tims.

The present investigation was carried out to evaluate the effects of dioxide titanium particles on growth and performance character. Based on previous works, it is expected that TiO2 nanoparticles (NPs) improving the feed efficiency and promote silk protein synthesis in the silkworm can be improved important traits such as cocoon shell weight and cocoon weight. The experiment was designed in a completely randomized design with three replications. Five groups of silkworms fed diets with dioxide titanium nanoparticles at 0, 5, 10, 50, and 100 mg/l in duration 4 and 5 instars. Data were analyzed by SAS software, and Duncan test was used to compare the mean. It was observed that the addition of dioxide titanium nanoparticles at different levels significantly improved percent viability, cocoon and cocoon shell performance compared control group. In comparison to the control treatment, cocoon weights rose by 3. 3 and 3. 85 percent in 5 and 10 mg/l dioxide titanium, respectively. In comparison to the control treatment, 5 mg/l nanoparticles had a higher cocoon shell weight and cocoon shell ratio of 10. 40 and 6. 27 percent, respectively. Results showed that using dioxide titanium nanoparticles in 5 and 10 mg/l can increase cocoon and cocoon shell performance, but it has not effect on these traits with higher concentration.

In this paper, the effect of titanium dioxide nanoparticles on the response of the freely suspended nano-fluid was investigated in an external electric field. Applying the external electric field to liquid film carrying electric current caused the layer rotation. It was due to the surface charge response of the layer to the electric field. The effect of surface charge on titanium dioxide nano-fluid rotation at various concentrations was studied. The results showed that the presence of nanoparticles in the fluid doubled the rotation velocity. Also, the effect of ultraviolet radiation on the rotation velocity of the fluid was examined, showing that there was no significant impact on rotation velocity. Finally, the needed time to reach the maximum rotation velocity of the nano-fluids layers was measured.