Research On Cu₂o\WO₃Composite Photocatalyst Preparation And Its Photocatalytic Properties

Cu2O, WO3have a good response to visible light in photocatalysis has good prospects,has become a hot research. This article was prepared by glucose reduction WO3preparedCu2O, chemical precipitation and low temperature hydrothermal method,chemicalprecipitation core-shell structure WO3/Cu2O prepared composite photocatalyst. By X-raydiffraction (XRD), scanning electron microscopy (SEM), spectroscopy (UV-vis) and Fouriertransform infrared spectroscopy to characterize them, using its degradation of methylene bluesolution to analyze its photocatalytic properties. And to study the structures photocatalyticreaction system, using polyester fiber cotton load photocatalyst using xenon lamps simulatevisible light photocatalytic degradation of formaldehyde experiment. The results showed that:(1) Size reduction method using glucose Cu2O particles of small, generally less than50nm, more uniform particle size, showing cube or microsphere-based, clear structure,particle integrity. XRD analysis shows the test results, there are five peaks, peaks were29.64°,36.34°,42.42°,61.32°,73.42°point, which corresponds to the crystal plane indicesare (110),(111),(200),(220) and (311), which is consistent with the standard library Cu2Ospectra, showed red-brown powder was prepared Cu2O. Cu2O by the UV-visible spectrumcurve at the wavelength of360nm or more, a significant increase in absorbance, the presenceof peaks at about580nm, i.e., the visible region of the spectrum, indicating a betterphotocatalytic effect Cu2O under visible light. The FT-IR spectra of Cu2O can be seen in thepresence of an oxidizing-OH groups.(2) Were prepared using chemical precipitation and low temperature hydrothermalmethod WO3split the two methods, clear crystal structure, smaller particle size. XRD analysisshows the test results, WO3low temperature prepared at2θ=16.50,25.60and34.90appeared typical orthorhombic hydrated WO3H2O three strongest peak. Overall, the methodcan be easily prepared uniform particle size distribution of nano WO3powders. WO3can beseen in the SEM electron microscopy, WO3smaller particle size, usually around200nm. Uniform crystal size, surface area, showing flaky crystals, bonding with each other, poordispersion. WO3powders prepared by low-temperature hydrothermal uniform particle size tonanometer level. The Fourier Transform Infrared testing can be seen in a clear image3400trough, where the presence of a hydroxyl group is OH, prepared as described WO3photocatalyst having oxidation.(3) Composite light Cu2O\WO3catalyst was prepared to consider the nuclear shellstructure to Cu2O core and shell surface load WO3was prepared by loading photocatalyst.Upcoming prepared Cu2O voted not to join in forming WO3. Study its photocatalyticproperties. XRD analysis shows the result, XRD peak WO3crystal did not change thecomposite, respectively, at the2θ=31.74,45.52,66.26,75.32there is a clear peak, the peakcorresponding to the original Cu2O crystals have different degrees of offset which process iscomplex due to the solid solution crystals larger atomic radius will cause an increase ofdatoms, theta angle decreases, so that the peak to the left. In the preparation of core-shellcomposite photocatalyst structure, the presence of the complex process that leads to the innerdiameter of Cu2O becomes large, so that the peak shift. Thus, the preparation of the compositephotocatalyst, leading to changes in the original crystal, thus affecting its photocatalyticproperties. XRD analysis to compare. WO3in the composite peak has increased, decreasedpeak and Cu2O, and an offset.WO3/Cu2O composite photocatalyst SEM electron microscopy analysis, moleculardiameter of about10um, can clearly be seen that the surface of Cu2O cubes wrapped in a layerof WO3molecules form a complex. Its specific surface area is increased, agglomerationbetween molecules. By UV-visible spectral scanning composite photocatalyst WO3/Cu2Obetter absorb light in the visible range, and after WO3/Cu2O complex, enhances its absorptionpeaks in the visible range of the visible beneficial to its catalytic properties.(4) Through the degradation of methylene blue solution experiments, Cu2O\WO3composite photocatalytic degradation of methylene blue solution is more effective than asingle Cu2O and WO3degradation effect. Showed that the composite Cu2O\WO3improvedphotocatalytic degradation.