Titanium dioxide-based photocatalytic material selectively modified by noble metal nanoparticles and its preparation method and application

A photocatalytic material, titanium dioxide technology, applied in the field of solar energy utilization and environmental protection, can solve the problems of low photocatalytic reduction efficiency and low solar light energy capture efficiency, achieve high photocatalytic reduction activity, simple process flow, and avoid self-forming. nuclear effect

Active Publication Date: 2019-06-18
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Through the selective modification of noble metal nanoparticles, the effective and directional separation of photogenerated electron-hole pairs is realized. After the photocatalytic material is excited by light, the photogenerated electrons are enriched on the surface, which greatly improves the photocatalytic reduction efficiency. Applied to the photocatalytic reduction and purification of nitrate in water under sunlight, which solves the problems of low photocatalytic reduction efficiency of traditional photocatalytic materials and low efficiency of sunlight light energy capture

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  • Titanium dioxide-based photocatalytic material selectively modified by noble metal nanoparticles and its preparation method and application
  • Titanium dioxide-based photocatalytic material selectively modified by noble metal nanoparticles and its preparation method and application
  • Titanium dioxide-based photocatalytic material selectively modified by noble metal nanoparticles and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] This embodiment is the preparation of nano-scale titanium dioxide crystals with surface-optimized growth, and the specific process is as follows:

[0049] First, dissolve 1.6g of titanium tetrafluoride in 400mL of tert-butanol solution to obtain a light yellow clear reaction solution; secondly, transfer the resulting solution into a polytetrafluoroethylene inner container, seal it with an autoclave outer container, and The reaction was incubated at ℃ for 72 hours to generate a suspension containing surface-optimized titanium dioxide crystals; finally, the resulting suspension was centrifuged, and the obtained powder was alternately washed 8 times with deionized water and absolute ethanol, and dried at 60 After drying at ℃ for 10 h, it was ground for later use.

[0050] The powder obtained in this embodiment is the titanium dioxide crystal grown on the surface, figure 1 (a) is the XRD pattern of the crystal, it can be seen that it is an anatase phase titanium dioxide cr...

Embodiment 2

[0052] This embodiment is the preparation of titanium dioxide-based photocatalytic materials selectively modified by silver nanoparticles, and the specific process is as follows:

[0053] 1) Ultrasonic disperse 50 mg of the powder obtained in Example 1 in 5 mL of absolute ethanol to obtain a suspension of titanium dioxide. Use a spin coater to coat 1 mL of the suspension on a quartz plate to form a thin film and dry it at 60° C. for 10 h for use.

[0054] 2) the quartz plate of the coating film obtained in step 1) is fixed on one side of the self-made reaction tank, and the dehydrated ethanol solution of 100mL silver nitrate is added in the reaction tank (Ag in the solution + Concentration is 10 -4 mol / L), high-purity argon was passed into the solution for half an hour in advance to blow oxygen and a protective atmosphere was maintained during the reaction process, and the light intensity was placed at 5mW / cm 2 The photodeposition reaction was carried out under ultraviolet li...

Embodiment 3

[0062] This example is the preparation of a micron-sized titanium dioxide-based photocatalytic material selectively modified by gold nanoparticles, and the specific process is as follows:

[0063] 1) Preparation of micron-scale surface-optimized titanium dioxide crystals, the process is as follows:

[0064] First, dissolve 0.32g of titanyl sulfate and 1.5mL of 40% hydrofluoric acid in 400mL of secondary deionized water to obtain a light yellow clear reaction solution; secondly, transfer the resulting solution into a polytetrafluoroethylene liner, and use an autoclave to The outer tank is well sealed, and the temperature is kept at 180 °C for 2 hours to generate a suspension containing titanium dioxide crystals grown on the surface; finally, the obtained suspension is centrifuged, and the obtained product is alternately washed with deionized water and absolute ethanol twice. powder 5 times, and after drying at 60°C for 10 h, grind it for later use.

[0065] 2) Ultrasonic dispe...

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Abstract

The invention discloses a photocatalytic material based on titanium dioxide selectively-modified with precious metal nanometer particles and a preparation method and an application of the photocatalytic material, and belongs to the technical fields of solar energy utilization and environmental protection. Through combination of crystal face engineering technology and selective photo-deposition design, selective modification of titanium dioxide crystals having preferred face growth with the precious metal nanometer particles is successfully achieved. Through selective modification with precious metal nanometer particles, effective and oriented separation of photo-induced electrons and electron-hole pairs is achieved. After the photocatalytic material is excited with light, the surface of the photocatalytic material is enriched with photo-induced electrons. The photocatalytic material can be directly applied to photocatalytic reduction purification of nitrate in water under the sunlight. The problems that a conventional photocatalytic material is low in reducing efficiency and the capture efficiency of solar energy is low are solved.

Description

technical field [0001] The invention relates to the technical field of solar energy utilization and environmental protection, in particular to a titanium dioxide-based photocatalytic material selectively modified by noble metal nanoparticles and a preparation method and application thereof. Background technique [0002] Titanium dioxide, as an important semiconductor photocatalytic material, has attracted extensive attention from scientific and technological workers due to its broad application prospects in the fields of solar energy utilization and environmental restoration. Starting from the basic principles of photocatalytic reactions, photocatalytic reactions can be divided into two categories, namely, photocatalytic oxidation reactions and photocatalytic reduction reactions. In the field of environmental remediation, most of the reports focus on the photocatalytic oxidation of environmental pollutants, while there are relatively few reports on the photocatalytic reducti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J21/06B01J23/50B01J23/52B01J37/00B01J35/02B82Y30/00C02F1/30C02F1/70C02F101/16
Inventor 李琦尚建库杨炜沂孙德臣周龙
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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