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In this paper, two kinds of CNT/TiO2 composites were synthesized by different sol-gel methods. Comparing to the TiO2 /CNTs prepared by method 1 (Tetrabutyl titanate+CNT, H2O), the catalysts synthesized by method 2 (Tetrabutyl titanate, CNT+H2O) showed higher photocatalytic activity and the optimum content of CNT was 1%. Furthermore, diverse reactors were introduced to deal with methyl orange and phenol...
As one of the typical indoor pollutants, formaldehyde has attracted more and more attention. It is well known that long-term exposure to even fairly low levels of formaldehyde will bring the risk of asthma, eczema and other diseases. In this study, the nano-TiO2/β-cyclodextrin (β-CD) coated paper was applied to remove formaldehyde under UV irradiation. The optimum composition of the nano-TiO2/ β-CD...
The loading photocatalyst of TiO2/hollow pearls was prepared by sol-gel method and hollow pearls as carrier. The results indicate that the approach of TiO2 loading on hollow pearls is viable. The scanning electron microscope (SEM) images show that the coating layer is symmetrical on the hollow pearls; the UV-vis DRS shows that TiO2/hollow pearls has strong absorption in the UV range, and the absorption...
A magnetically separated fly ash micro-sphere (MSFM) were prepared by citrate sol-gel process.The microstructure of the products were tested by SEM and EDS. It was found that the MSFM was coated with network of barium ferrite, which exhibited the magnetic absorption property. Then the TiO2 film photocatalysts immobilized on MSFM were prepared by sol-gel method, methods. The crystal phase and morphology...
Photoelectrochemical (PEC) degradation and electrodegradation (ED) of methyl orange were investigated in aqueous NaCl and Na2SO4 solutions. Photocatalytic degradation(PCD) was also performed in TiO2(P25) suspension under UV-irradiation for comparison. Electrodegradation efficiencies showed enhanced decolorization performance at higher concentrations of electrolyte solutions and applied potentials...
TiO2 catalyst was prepared by two kinds of different methods. The photocatalytic activity of TiO2 prepared by the hydrothermal method is 2.5 times higher than that by sol-gel in degradation dimethyl phthalate (DMP). The combined photocatalysis with UV irradiation and ozonation (TiO2/UV/O3) process considerably improved mineralization and degradation of dibutyl phthalate compared to combined photocatalysis...
Photoelectrocatalytic (PEC) degradation and electrodegradation (ED) of methyl orange were investigated in aqueous NaCl, NaHCO3 and Na2SO4 solutions. The effects of electrolytes concentration and applied potential were studied in the above two processes. Photocatalytic oxidation (PCO) was also performed in TiO2(P25) suspension under UV-irradiation for comparison. Enhanced decolorization performance...
Atrazine is a widely-used herbicide and always contaminates water bodies due to its relatively higher solubility and persistence. The removal efficiency of atrazine in water and the influencing factors by combined process of solar irradiation and S- doped TiO2 were studied in detail, in which S-doped TiO2 photo-catalyst with high sunlight activity was prepared by acid catalyzed hydrolysis method using...
Photocatalytic degradation of endocrine disrupting chemical bisphenol A (BPA) by TiO2 with 245 nm ultraviolet (UV) light was studied in a batch reactor. Response surface methodology (RSM) and central composite design (CCD) were employed to optimize three parameters, viz. TiO2 concentration, initial BPA concentration, and UV light intensity. The optimized conditions of photocatalytic degradation of...
La-doped TiO2/Ti photoelectrodes were prepared by anodization and characterized by SEM, XRD, XPS and UV/VIS/NIR. Photoelectrocatalytic (PEC) performance of La-doped TiO2/Ti photoelectrodes under visible light irradiation was tested. The results of these experiments showed that La-doped TiO2/Ti photoelectrodes prepared under voltage of 160 V, the current density of 100 mA/cm2, La(NO3)3 concentration...
This paper investigated the photochemical behavior of diphenolic acid (DPA) in the presence of beta-cyclodextrin (CD) and TiO2 suspensions under a 250 W metal halide lamp (lambdages 365 nm). The interaction of DPA with CD yielded the formation of inclusion complexes at 1:1 stoichiometric ratio in solution. The irradiation of DPA and TiO2 suspensions in the presence of beta-CD showed that the photodegradation...
The Fe3+-doped and undoped TiO2 nanoparticles have been prepared employing sol-gel method with hydrolysis mechanism. The nanoparticles were characterized with powder X-ray diffraction and scanning electron microscopy. The experimental results showed that Fe3+-doped TiO2 possess the average particle size in the nanoscale range. The photocatalytic performance of the nanoparticles was observed for degradation...
In this paper, our previous work on the fabrication of four models involving nanometer-size TiO2 and their environmental applications are reviewed. The material characterization and the ability to remove pollutants in water for four models are examined. The obtained models have exhibited excellent photo electrocatalytic activity, high photoconversion efficiency, superior charge separating ability...
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