Preparation, characterization and activity evaluation of p–n junction photocatalyst p-ZnO/n-TiO2
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Methyl orange
Zinc nitrate
p–n junction
In this paper, p-n coupled photocatalyst CoO/CdS/TiO 2 was prepared by method of impregnation. The structure and optical properties of CdS/TiO2 and CoO/CdS/TiO 2 were characterized by XRD, SEM, BET and UV–vis DRS. The photocatalytic activities of the photocatalysts were evaluated by photocatalytic degradation of methyl orange, and the effect of photocorrosion of CdS in CoO/CdS/TiO 2 was investigated by analyzing the cadmium concentration in the supernate collected after photocatalytic reactions. The results showed that p-n coupled photocatalyst CoO/CdS/TiO 2 not only showed higher efficiency in degradation of methyl orange than CdS/TiO 2 , but also exhibited resistance against cadmium leakage under light irradiation. The mechanism of the photocorrosion-delaying by p–n junction was also discussed.
Methyl orange
Cadmium sulfide
Degradation
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BiVO4 hollow nano-fiber photocatalytic material was prepared via two steps method of soaking and thermal transition using the cotton fiber as the template. The as-prepared samples were characterized by XRD, SEM and BET. The photocatalytic activity under visible light was evaluated by photocatalytic degradation of methyl orange(MO) in the solution. It was found that the samples calcinated at 400°C for 3.5 h had the hollow tube structure which is the copy of the cotton fibre structure and had the best photocatalytic activity. The decolorization rate of methyl orange can reach to be 97 % or so, increased 16 % than that of sample that prepared with no cotton fiber template. It indicated that the sample’s morphology and the specific surface area was the main reason of higher photocatalytic activity.
Methyl orange
Template method pattern
Degradation
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A comparative study of the Carbon Quantum Dots (CQDs) based composites photocatalyst for water purification was carried out. New finding of CQDs and TiO 2 have demonstrated significant advantage since it provides environmentally friendly for photocatalytic degradation of methyl orange (MO) dye. CQDS and TiO 2 were prepared by using hydrothermal method. The CQDs and CQDS/TiO 2 were fully characterized by using transmission electron microscope (TEM) to identify the size range and shape that involve in the adsorption process. The synthesized CQDs and CQDs/TiO 2 had small semi spherical morphology with 5 nm in size. The result of photocatalytic activity revealed that there is photocatalytic degradation of MO in the presence of only pure CQDs and CQDs/TiO 2 composites which the value of concentration decreased against time. CQDs/TiO 2 exhibited higher photocatalytic activity, which indicated that both CQDs and TiO 2 played important roles for the high photocatalytic activity under visible light irradiation.
Methyl orange
Carbon Quantum Dots
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Abstract Single-crystalline zinc oxide (ZnO) with needle-like and flower-like morphologies has been successfully synthesized by decomposition of Zn(OH)42− in aqueous solution at 90 °C. The reaction temperature, reaction time, and zinc source are important factors in determining the phase and morphology of ZnO. When using zinc acetate as the zinc source at 90 °C for 90 min in an oil bath, ZnO with the needle-like morphology was obtained. Whereas using zinc nitrate as the zinc source, ZnO with flower-like morphology was produced.
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Nanomter WO3 - TiO2 composite photocatalyst were prepared by sol-gel method. X -ray reflection diffraction (XRD) spectra and scanning electron microscope (SEM) have Been used to investigate the structural properties and surface morphology of the composite nanopowder. Photocatalytic degradation experiments for 10mg/L Methyl orange solution were performed to inspect the influence of different preparation conditions on its photocatalytic activity. Methyl orange solution photocatalytic degradation has been heightened with the augment of the WO3 -TiO2 Nanopowder ,but the quality of the Nanopowder has a right numerical value in photocatalytic degradation ; Changing the time, Methyl orange solution photocatalytic degradation has been heightened with the extended time,but the photocatalytic degradation ratio of the Methyl orange solution has a right numerical value with prolonged time ; The resultes showed that the composite WO3 -TiO2 Nanopowder with the highest photocatalytic activity was obtained as the doping amount of钨酸钠= 3% and the highest photocatalytic activity was 94. 8%.
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Fe3+ and Al 3+ co-doped TiO2(Fe3+/Al3+-TiO2)composite photocatalysts were prepared by the sol-gel method using Ti(OC4H9)4 as precursor and characterized by X-ray diffraction(XRD)and UV-Vis.The effect of calcination temperature and salts in photocatalytic system on the photocatalytic activity of Fe3+/Al3+-TiO2 were investigated by photocatalytic degradation of methyl orange irradiated by sunlight.The photocatalytic activity of Fe3+/Al3+-TiO2 was enhanced with increasing temperature.HCO3-and NO2-decreased its photocatalytic activity.
Methyl orange
Degradation
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Under ultraviolet radiation,the Nano-TiO2 photocatalytic products can produce hydroxyl(·OH),which is a strong oxidation.It can oxidize I-to produce I2,which can form blue complex with water-soluble starch.Based on this,a new method was proposed for evaluating the photocatalytic activity of photocatalytic products.Compared with the traditional methyl orange degradation method,the proposed method characterized with higher sensitivity and speedy.The proposed method was successful applied to evaluate the photocatalytic activity of some photocatalytic products which bought from market,and the results were more consistent with traditional methyl orange degradation method.
Methyl orange
Degradation
Ultraviolet
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Ag doped TiO2 was formed on the surface of carbon nanotube(CNT) by the sol-gel method, and characterized by TEM, XRD. The photocatalytic activity of the Ag-TiO2 /CNT was evaluated in degradation of methyl orange with a 300 W high pressure mercury lamp. Effect of Ag doping quantity on the photocatalytic activity of the photocatalys was investigated.The photocatalytic experiment indicated that the photocatalytic activity was firstly improved and then decreased with an increase of amount of Ag doped in TiO2 nanoparticles,the optimal doping quantity was 0.8% silver （ mass fraction of TiO2）, methyl orange could be degraded 99.3 % by Ag-TiO2/CNT under the optimal conditions after 120min.
Methyl orange
Mass fraction
Mercury-vapor lamp
Titanium Dioxide
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Methyl orange
Hydrothermal Synthesis
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Methyl orange
Titanium oxide
Degradation
Titanium Dioxide
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