Carbon-Doped Tungsten Trioxide Exploration

As we all know, tungsten trioxide (WO₃) is an important material and it is indispensable for us in life. It has a wide range of applications in the field of gas detection and photocatalysis. The special structures and morphology of tungsten trioxide determine their excellent performance. The preparation for the quasi one-dimensional structure of the carbon-doped tungsten trioxide nanofibers (C-dopedWO₃) is based on template method as template, to explore the performance of carbon-doped tungsten trioxide Absorbent template method as a template prepared to quasi one-dimensional structure of the carbon-doped WO₃ nanofibers (C-dopedWO₃), which can improve the gas sensing performance and photocatalytic properties of the material.

the systematically study of carbon-doped tungsten trioxide performance based on the use of XRD, TEM, SEM, HRTEM, XPS, Raman spectra and other research samples by means of the analysis, which can find that there are the material selectivity and stability with acetone, and Methylene Blue as model pollutants investigats the photocatalytic activity of the material.

Exploration results are as follows:
(1) The carbon-doped WO₃ monoclinic phase under template prepared, the analysis of SEM, TEM, HRTEM and other means of testing shows: WO₃-500 fiber diameter with the diameter of the ultrafine nanocrystals composed about 20-40nm 5-10μm, which contains a large number of pores and a hollow structure. The grain size increases by the calcination temperature. The key peaks of C1s XPS spectra of samples of WC 282.2eV appear Raman spectra of carbon into the G-peak, etc. The results show that doped WO₃lattice of carbon atoms.

(2) In the test of different condition of different gases (such as acetone, methanol, ethanol, ammonia, etc.) of gas sensing of different operating conditions, we can find carbon-doped WO₃ shows high selectivity and sensitivity to acetone gas. The minimum detectable concentration of materials can reach 0.1ppm and material optimum calcination temperature is determined as 500 ℃ at 300 ℃. The WO₃-500 sensitivity of 5ppm acetone sample gas reaches 7.9; at 95% relative humidity conditions, the sensitivity of 5ppm acetone resistance remains 5.72. By repeating the gas sensing tests found to have long-term stability, H₂S and other toxic gases can not lead to inactivation of sensitive material.

(3) Comparing with pure WO₃ contrast, the WO₃-500 degradation of methylene blue catalytic activity improves significantly. Under visible light irradiation conditions, WO₃-500 and H₂O₂ Fenton system constructes within 120min of methylene blue degradation rate reaching 97.1%. The synergies of WO₃-500 and H₂O₂ are to enhance the degradation rate of methylene blue and degradation rate. Carbon -doped WO₃ catalyst has good stability and it is easily to separate from the degradation of the system, the catalyst reuse still shows high catalytic activity.

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