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Preparation method and application of a silver-doped tungsten oxide photocatalyst
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A technology of photocatalyst and tungsten oxide, which is applied in the field of photocatalytic materials, can solve the problems of complex preparation process, high equipment requirements, and difficult conditions to control, and achieve the effect of simple preparation process, low equipment requirements, and promotion of separation
Active Publication Date: 2019-10-15
FUZHOU UNIV
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[0005] In the prior art before the present invention, S. Mohammed etc. [S. Mohammed, et al. Enhancedvisible light photocatalytic activity of pristine and silver (Ag) doped WO 3 nanostructured thin films[J]. J Mater Sci: Mater Electron (2016) 27:12185–12192] Obtaining Ag-doped WO by liquid phase method 3 , the preparation process is complicated, the conditions are difficult to control, and the equipment requirements are high
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Embodiment 1
[0023] The invention provides an Ag-doped WO 3 The preparation method of the photocatalyst adopts the solid-phase method, and the specific operation steps are:
[0024] Accurately weigh 50mg AgNO 3 Solid particles and 1g of HPW (phosphotungstic acid) were mixed in a mortar and ground for 0.5 hours to make them fully mixed.
[0025] After mixing evenly, transfer it to a crucible, place it in a muffle furnace, and calcinate at 550 °C for 4 h (the heating rate is 5 °C / min), and the Ag-doped WO 3 Photocatalyst, the product is marked as A 5 W 100 .
Embodiment 2
[0027] The invention provides an Ag-doped WO 3 The preparation method of the photocatalyst adopts the solid-phase method, and the specific operation steps are:
[0028] Accurately weigh 100mg AgNO 3 Solid particles and 1g of HPW (phosphotungstic acid) were mixed in a mortar and ground for 0.5 hours to make them fully mixed.
[0029] After mixing evenly, transfer it to a crucible, place it in a muffle furnace, and calcinate at 550 °C for 4 h (the heating rate is 5 °C / min), and the Ag-doped WO 3 The photocatalyst product is labeled as, A 10 W 100 .
Embodiment 3
[0031] The invention provides an Ag-doped WO 3 The preparation method of the photocatalyst adopts the solid-phase method, and the specific operation steps are:
[0032] Accurately weigh 150mg AgNO 3 Solid particles and 1g of HPW (phosphotungstic acid) were mixed in a mortar and ground for 0.5 hours to make them fully mixed.
[0033] After mixing evenly, transfer to a crucible, place in a muffle furnace, 550°C for 4h (heating rate is 5°C / min), and Ag-doped WO 3 Photocatalyst, A 15 W 100 .
[0034] The prepared Ag-doped WO 3 After the photocatalyst was added to the rhodamine B solution (10ppm), after irradiating with a xenon lamp (300W, equipped with a 420nm cut-off filter) for 2h, A 10 W 100 The degradation efficiency of rhodamine B solution is the best, the degradation rate reaches 91%, and the kinetic constant of the first order reaction k=0.0186min -1 , respectively WO 3 1.8 times (WO 3 The degradation rate of photocatalyst to rhodamine B solution is 50%) and 3.6 t...
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Abstract
The invention belongs to the technical field of photocatalytic materials, and specifically relates to a preparation method and application of a silver-doped tungstenoxide photocatalyst. The method uses phosphotungstic acid as the tungsten source and silver nitrate as the doping silver source. By changing the Ag dopingImpurity content, Ag-doped WO is synthesized in one step using solid-phase method 3 catalyst of light. The results obtained show that Ag successfully entered the WO 3 lattice site, which is WO 3 Photocatalysts create conditions for efficient utilization of sunlight and efficient electron-hole separation. In the experiment of photocatalytic degradation of rhodamine B (RhB), Ag-doped WO 3 exhibits better performance than pure WO 3 Better visible light catalytic performance. The invention has the advantages of simple preparation process, low equipment requirements, high repeatability, and easy large-scale industrial preparation.
Description
technical field [0001] The invention belongs to the technical field of photocatalytic materials, in particular to an Ag-doped WO 3 Preparation method of photocatalyst and application in water pollution control and environmental remediation. Background technique [0002] WO 3 Due to its excellent photochemical stability, strong oxidation ability of valence band holes, low price, non-toxicity, and wide range of sources, it is considered as a promising photocatalytic material. However, like other semiconductor photocatalysts, pure WO 3 The photocatalytic performance of α is relatively weak due to its weak utilization of sunlight and fast recombination of photogenerated electrons and holes. These disadvantages limit WO 3 large-scale commercial application. [0003] Noble metaldoping is to improve WO 3 Effective means for photocatalytic performance. On the one hand, noble metal doping can be used in WO 3 A doping energy level is formed between the valence band and the co...
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