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TiO2/WO3 visible-light photocatalyst with surface oxygen vacancy, and preparation method and application thereof

A photocatalyst and surface oxygen technology, applied in the field of photocatalytic materials, can solve problems such as the reduction of photocatalyst activity, and achieve the effects of promoting migration and separation, good catalytic activity, and increased visible light photocatalytic activity

Inactive Publication Date: 2017-03-08
INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In recent years, it has been widely reported that defects have an important impact on the generation, separation, migration and capture of photogenerated charge and hole pairs, but not all defects are beneficial to photocatalytic activity. Deep defects inside the crystal can become photogenerated electrons and electrons. The recombination center of holes leads to the decrease of photocatalyst activity

Method used

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  • TiO2/WO3 visible-light photocatalyst with surface oxygen vacancy, and preparation method and application thereof
  • TiO2/WO3 visible-light photocatalyst with surface oxygen vacancy, and preparation method and application thereof
  • TiO2/WO3 visible-light photocatalyst with surface oxygen vacancy, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Weigh 2.59 g of P25 and dissolve it in 1000 mL of 10% v / v nitric acid solution, and stir at room temperature. Add 35.0 g of ammonium tungstate hydrate gradually under stirring, stir for 1 hour until the mixture is uniform, leave it at room temperature for aging for 24 hours, filter, wash with deionized water for 5-6 times, dry at 100°C for 24 hours, muffle furnace 500 Calcined at ℃ for 24 hours to obtain TiO 2 / WO 3 , wherein the molar ratio of titanium and tungsten is 4:1. Then pure hydrogen was reduced at a flow rate of 50 ml / min at 300 °C for 2 hours to obtain a photocatalyst with surface oxygen vacancies. The resulting catalyst was labeled 300T.

Embodiment 2

[0016] In Example 1, the pure hydrogen reduction temperature was changed to 200 °C, and the reduction time was still 2 hours, that is, the cost example, marked as 200T.

Embodiment 3

[0018] In Example 1, the pure hydrogen reduction temperature was changed to 400 °C, and the reduction time was still 2 hours, that is, the cost example, marked as 400T.

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Abstract

The invention discloses a TiO2 / WO3 visible-light photocatalyst with surface oxygen vacancy, and a preparation method and application thereof. The TiO2 / WO3 visible-light photocatalyst is prepared through the following steps: with P25, HNO3 and an ammonium tungstate hydrate as precursors, carrying out calcination by controlling the temperature in a range of 450 to 550 DEG C in static air so as to obtain TiO2 / WO3; and with pure hydrogen as a reducing agent, carrying out reduction by controlling the temperature in a range of 200 to 600 DEG C so as to obtain the TiO2 / WO3 with surface oxygen vacancy. The TiO2 / WO3 visible-light photocatalyst with the surface oxygen vacancy provided by the invention forms visible light absorption in a wavelength range of 400 to 800 nm, and has good visible-light photocatalytic degradation efficiency to gaseous toluene; meanwhile, the TiO2 / WO3 visible-light photocatalyst has simple preparation method and significant effects, and can improve the utilization rate of sunlight.

Description

technical field [0001] The invention belongs to the technical field of photocatalytic materials, in particular to a surface oxygen-deficient TiO for photocatalytic degradation of gas-phase organic pollutants 2 / WO 3 Photocatalyst and its preparation method and application. Background technique [0002] Environmental issues directly affect sustainable economic and social development and human health, and their effective governance has received more and more attention. Photocatalytic technology is a treatment technology developed in recent decades, and has broad market prospects in the degradation of organic pollutants. TiO 2 Because of its good stability, mild reaction conditions, high catalytic activity, and low price, it has become the most commonly used photocatalyst, but its wide band gap (3.0-3.2 eV) can only absorb ultraviolet light, which accounts for only 4% of sunlight. The utilization rate of solar energy is low; another restrictive factor is TiO irradiated by u...

Claims

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Application Information

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IPC IPC(8): B01J23/30B01D53/86B01D53/72
CPCB01D53/8668B01J23/002B01J23/30B01J35/39
Inventor 贾宏鹏李娟娟蔡松财许珍
Owner INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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