Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for preparing three-element doped high-activity titanium deoxide catalyst

Inactive Publication Date: 2009-08-19
NANKAI UNIV
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

One of the most important ways is doping, including excessive metal doping, rare earth metal doping, etc. These doping forms reduce the semiconductor band gap and expand the photoresponse range to a certain extent, but another problem is that whether it is interstitial Type of doping or substitution type doping, many times in TiO 2 The electron-hole recombination probability is increased in the crystal, which leads to the enhancement of the visible light catalytic ability of the catalyst, while the ultraviolet photocatalytic ability decreases
[0004] Simultaneous doping methods include sol-gel method, hydrothermal synthesis method, vapor phase deposition method, ion beam sputtering method, etc. These methods generally have the problem of high cost or high equipment requirements, and it is difficult to realize industrial scale production

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for preparing three-element doped high-activity titanium deoxide catalyst
  • Method for preparing three-element doped high-activity titanium deoxide catalyst
  • Method for preparing three-element doped high-activity titanium deoxide catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Take a certain amount of InCl 3 4H 2 O solid, using deionized water as a solvent, prepared as 0.6753mol / L InCl 3 solution. Take 40ml of absolute ethanol, stir on a magnetic stirrer at room temperature, add 260 μl of InCl 3 Solution and 1ml hydrochloric acid (analytical pure), slowly drop into 12ml tetrabutyl titanate (concentration is 98%), then every 15 minutes respectively 0.2ml concentration is 99% SnCl 4 solution and 3ml of ammonia water with a concentration of 25%, quickly form a precipitate, place it for 5 hours to evaporate the solvent, bake it in an oven at 100°C for 10 hours, grind it into powder with an agate mortar, put it in a crucible, and place it in a muffle furnace at 450°C in air Calcined in the atmosphere for 2.5h to obtain nano-scale three-element doped TiO 2 Photocatalyst A (see Figure 1-3 Middle A curve). In this catalyst, TiO 2 Anatase phase (see attached figure 1 XRD spectrum of the sample), where TiO 2 The molar ratios of In element, Sn...

Embodiment 2

[0022] Experimental condition, step are the same as embodiment one, change InCl 3 The amount of solution added was 52 microliters to obtain TiO 2 The molar ratio of In element, Sn element and N element is 100:0.1, 100:5, 86:100 nano-scale optical TiO 2 Catalyst B (see Figure 1-3 Middle B curve), using the above photocatalytic activity evaluation method, under the light irradiation, the degradation rate of p-chlorophenol was 73.08% after 8 hours, and under the excitation of ultraviolet light, the degradation rate was 91.23% after 1 hour.

Embodiment 3

[0024] Experimental condition, step are the same as embodiment one, change InCl 3 The amount of solution added was 156 microliters, and TiO 2 Nano-scale optical TiO with molar ratios of In, Sn and N elements of 100:0.3, 100:5, 86:100, respectively 2 Catalyst C (see Figure 1-3 Middle C curve), using the above-mentioned photocatalytic activity evaluation method, under the light irradiation, the degradation rate of p-chlorophenol was 79.25% after 8 hours, and under the excitation of ultraviolet light, the degradation rate was 64.91% after 1 hour.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle sizeaaaaaaaaaa
Login to View More

Abstract

The invention discloses a new method for preparing a three-element doped high-activity titanium dioxide catalyst. It uses titanate or titanate as a precursor, ammonia water, indium salt, and tin salt as dopants, and prepares an anatase phase titanium dioxide catalyst by hydrolysis precipitation. The average particle size of the catalyst is 9.5nm, the crystal form is all anatase phase, and it has strong visible and ultraviolet photocatalytic activity. The invention has the following advantages: the titanium dioxide catalyst is prepared by co-doping a non-metal element and two metal elements, has high photocatalytic activity, and has great application potential in the fields of environmental science and engineering applications. The invention has simple process, low requirements on equipment, small product particle size, large specific surface area, good dispersibility, all are in anatase phase, and compared with pure TiO2, the activity of ultraviolet light and visible light is greatly improved.

Description

【Technical field】 [0001] The invention relates to a method for preparing a titanium dioxide nano-powder catalyst, which belongs to the technical field of catalysis. More specifically, the invention provides a method for preparing a titanium dioxide nano-photocatalyst doped with three elements and having high catalytic activity. 【Background technique】 [0002] In the 21st century, resource scarcity, energy shortage and environmental pollution are becoming more and more serious. These have become the main problems and challenges facing the world today. In order to achieve sustainable development and the harmonious unity of the ecological environment, human survival and social development, human beings must be required to take active measures to address these problems and challenges, which makes pollution prevention and control a global issue. In recent decades, research on photochemical degradation of pollutants has been continuously emerging and in-depth. Among them, semicond...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): B01J21/06B01J37/03
Inventor 曹亚安王恩君赵路松龙绘锦
Owner NANKAI UNIV