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A Dispersion Method of Ultrafine Pt Nanoparticles on the Surface of Anatase/Bronzeite Mixed Crystal Titanium Dioxide
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A titanium dioxide, nanoparticle technology, applied in the field of photocatalysis
Active Publication Date: 2020-10-30
NORTHEAST NORMAL UNIVERSITY
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Problems solved by technology
Up to now, there is no report on the treatment of anatase / bronzeite mixed crystal TiO by microwave ultrasonic method. 2 Technology to surface and disperse ultrafine Pt nanoparticles to increase the hydrogen production rate of water splitting
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Embodiment 1
[0042] Add 0.5g of anatase / bronzeite mixed crystal titanium dioxide powder into the ultrasonic reaction vessel, then add 100mL of ultrapure water, the ultrasonic power is 1500W, the pulse frequency is 1:1, the microwave heating power is 200W, and the reaction temperature is 80°C , the reaction time is 8 hours. Subsequently, photoreduction deposition of Pt was carried out on the anatase / bronzeite mixed crystal titanium dioxide after microwave ultrasonic treatment, and 90 mL of ultrapure water and 10 mL of methanol were added to the reactor, and then 0.05 g of anatase after microwave ultrasonic treatment for 8 hours was added. Titanium ore / bronzeite mixed crystal titanium dioxide, and then add 0.25 mL of chloroplatinic acid aqueous solution with a mass concentration of 1 wt.% to the solution, and the light time for photoreduction is 1 hour. This embodiment is the best embodiment.
[0043] Comparative sample
[0044] Add 90mL of ultrapure water and 10mL of methanol into the rea...
Embodiment 2
[0047] Add 0.5g of anatase / bronzeite mixed crystal titanium dioxide powder into the ultrasonic reaction vessel, then add 100mL of ultrapure water, the ultrasonic power is 1500W, the pulse frequency is 1:1, the microwave heating power is 200W, and the reaction temperature is 80°C , the reaction time is 4 hours. Subsequently, photoreduction deposition of Pt was carried out on the anatase / bronzeite mixed crystal titanium dioxide after microwave ultrasonic treatment, and 90 mL of ultrapure water and 10 mL of methanol were added to the reactor, and then 0.05 g of anatase after microwave ultrasonic treatment for 4 hours was added. Titanium ore / bronzeite mixed crystal titanium dioxide, and then add 0.25 mL of chloroplatinic acid aqueous solution with a mass concentration of 1 wt.% to the solution, and the light time for photoreduction is 1 hour.
[0048] The Pt / anatase / bronzeite mixed crystal titanium dioxide obtained by the method of this embodiment, the ultrafine Pt nanoparticles a...
Embodiment 3
[0050] Add 0.5g of anatase / bronzeite mixed crystal titanium dioxide powder into the ultrasonic reaction vessel, then add 100mL of ultrapure water, the ultrasonic power is 1500W, the pulse frequency is 1:1, the microwave heating power is 200W, and the reaction temperature is 80°C , the reaction time is 8 hours. Subsequently, photoreduction deposition of Pt was carried out on the anatase / bronzeite mixed crystal titanium dioxide after microwave ultrasonic treatment, and 90 mL of ultrapure water and 10 mL of methanol were added to the reactor, and then 0.05 g of anatase after microwave ultrasonic treatment for 8 hours was added. Titanium ore / bronzeite mixed crystal titanium dioxide, and then add 0.25mL chloroplatinic acid aqueous solution with a mass concentration of 1wt.% to the solution, and the light time for photoreduction is 2 hours.
[0051] The Pt / anatase / bronzeite mixed crystal titanium dioxide obtained by the method of this embodiment, the ultrafine Pt nanoparticles are d...
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Abstract
The invention relates to the field of photocatalysis and relates to an anatase / dioptase mixed-crystal titanium dioxide surface superfine Pt nano particle dispersion method. The method disclosed by theinvention comprises the steps: performing surface microwave ultrasonic treatment on anatase / dioptase mixed-crystal titanium dioxide; then performing photodeposition on Pt to obtain anatase / dioptase mixed-crystal titanium dioxide surface superfine Pt nano particles (-3nm); performing photodeposition on surface-untreated titanium dioxide to loaded Pt to obtain large-size Pt nano particles (7 to 12nm) dispersed on the surface of the anatase / dioptase mixed-crystal titanium dioxide. Furthermore, a photocatalysis hydrogen generation rate of microwave ultrasonic treated loaded Pt is 3 times of the photocatalysis hydrogen generation rate of microwave ultrasonic untreated loaded Pt, and a hydrogen regeneration rate of microwave ultrasonic treated Pt loaded anatase / dioptase mixed-crystal titanium dioxide is 23 times of the hydrogen regeneration rate of microwave ultrasonic untreated Pt unloaded anatase / dioptase mixed-crystal titanium dioxide. According to the method disclosed by the invention,the superfine Pt nano particles can be dispersed on the surface of the anatase / dioptase mixed-crystal titanium dioxide; furthermore, a water decomposition hydrogen speed is greatly improved.
Description
technical field [0001] The invention relates to the field of photocatalysis, in particular to a method for dispersing ultrafine Pt nanoparticles on the surface of anatase / bronzeite mixed crystal titanium dioxide. Background technique [0002] Since Fujishima and Honda in 1972 in the n-type semiconductor TiO 2 Since the photoelectric catalysis of water was realized on single crystal electrodes, heterogeneous photocatalytic technology has attracted great attention of scientific and technological researchers from all walks of life in the world. Therefore, the use of solar photocatalytic hydrogen production is one of the important ways to solve the energy crisis and environmental pollution problems. one. As the most important clean energy in the 21st century, hydrogen is considered to be the most ideal fuel. Scientists want to use sunlight to convert hydrogen in water into hydrogen, but the catalytic efficiency of photocatalysts has not been very satisfactory. Researchers have...
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