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Acidified mixed crystal TiO2 nanowire loaded photocatalyst and preparation and application of photocatalyst

A photocatalyst and nanowire technology, which is applied in the direction of physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc., can solve the problem of high photogenerated electron-hole pair recombination rate, solar Low light utilization rate, low responsiveness and other problems, to achieve the effect of broadening the scope of application, easy separation and recovery, and improving catalytic activity

Active Publication Date: 2015-06-24
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, TiO 2 There are still some problems in the practical application of nanomaterials: (1) Due to the wide band gap, they can only absorb ultraviolet light, have low responsiveness in the visible light range, and low utilization rate of sunlight; (2) Photogenerated electrons-space The recombination rate of hole pairs is high
These disadvantages seriously restrict its application in practical industry

Method used

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  • Acidified mixed crystal TiO2 nanowire loaded photocatalyst and preparation and application of photocatalyst
  • Acidified mixed crystal TiO2 nanowire loaded photocatalyst and preparation and application of photocatalyst
  • Acidified mixed crystal TiO2 nanowire loaded photocatalyst and preparation and application of photocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Example 1: Acid-functionalized mixed crystal TiO 2 nanowire loaded Fe 2 o 3 Catalyst Synthesis

[0025] (1) Disperse titanium dioxide P25 (Germany Degussa company, purity 99.5%, CAS No. NO: 13463-67-7) powder (1.5g) in 10M NaOH aqueous solution (140mL), and ultrasonically mix to obtain a suspension , put the suspension in a hydrothermal kettle, react at 200°C for 24h, cool to room temperature, filter out the precipitate, place it in 0.1M hydrochloric acid aqueous solution (150mL) for acidification, rinse with deionized water, and place in Dry in a vacuum drying oven to obtain titanate nanowires, then place the obtained titanate nanowires in a muffle furnace and calcinate at 600°C for 4 hours to obtain white mesoporous mixed crystal TiO 2 Nanowires (TNWs) 1.0 g;

[0026] (2) The obtained mixed crystal TNWs (1.0 g) was placed in Fe(NO 3 ) 3(0.361g) and absolute ethanol / water (volume ratio 1:1, 50ml) solution, add dropwise 0.5M sulfuric acid aqueous solution (1ml), i...

Embodiment 2

[0029] Example 2: Acid-functionalized mixed crystal TiO 2 Nanowire loaded Co 2 o 3 Catalyst Synthesis

[0030] (1) with embodiment 1 step (1);

[0031] (2) Place the obtained mixed crystal TNWs (1.0 g) in Co(NO 3 ) 2 (0.197g) and absolute ethanol / water (volume ratio 1:1, 80ml), add dropwise 0.5M sulfuric acid aqueous solution (1mL), immerse and stir to obtain a suspension, which is transferred to a hydrothermal kettle , reacted at 60°C for 6h, cooled to room temperature, discarded the supernatant, and dried in vacuum to obtain solid S-Co 2 o 3 / mixed crystal TNWs 0.8g.

Embodiment 3

[0040] The catalysts prepared in Examples 1-2 and Comparative Examples 1-2 were applied to the photocatalytic degradation reaction of organic printing and dyeing wastewater. The effect of functional modification and carrier selection on catalytic performance was analyzed by calculating and analyzing the decolorization rate of printing and dyeing wastewater.

[0041] Experimental steps for photocatalytic degradation of active organic printing and dyeing wastewater: prepare 1L of reactive brilliant red X-3B dye solution with a concentration of 100mg / L, adjust the pH of the reaction solution to 6.0 with dilute hydrochloric acid or sodium hydroxide solution according to the experimental requirements, and then weigh them respectively Take 0.5 g of each of the above catalysts and add them into the dye solution, turn on the magnetic stirrer, and mix the catalyst and the dye solution evenly. Before the photocatalytic degradation experiment, the reaction solution was shaken for 30 minu...

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Abstract

The invention provides an acidified mixed crystal TiO2 nanowire loaded photocatalyst. The photocatalyst is prepared by using the following method: dispersing titanium dioxide P25 in a NaOH aqueous solution, carrying out hydrothermal reaction on the obtained mixture, and after the reaction is completed, filtering out precipitates; putting the precipitates into a hydrochloric acid solution, carrying out impregnation acidification, washing the precipitates by using deionized water, drying the precipitates in a vacuum drying oven, and putting the precipitates into a muffle furnace and calcining for 2-8h at the temperature of 500-600 DEG C so as to obtain a mixed crystal TiO2 nanowire; adding the mixed crystal TiO2 nanowire and transition metal salt into an ethanol aqueous solution, dropwise adding a sulfuric acid aqueous solution, soaking and stirring, carrying out a hydrothermal reaction, and after the reaction is completed, removing liquid supernatant; and carrying out vacuum drying on the obtained object so as to obtain the photocatalyst. The photocatalyst can be applied to the visible light catalytic oxidation reaction of industrial organic wastewater, and is high in catalytic activity, good in stability, economical and efficient.

Description

(1) Technical field [0001] The invention relates to a photocatalytic material and its preparation method, as well as its application in the technical field of environmental pollution control, in particular to an acid-functionalized mixed crystal TiO 2 Nanowire-supported metal oxide photocatalyst and its preparation method and application. (2) Background technology [0002] After entering the 21st century, materials, energy and information are the three pillars of contemporary civilization, and energy and environmental issues have increasingly become major challenges that human development must face. It is found that solar energy is an efficient and inexhaustible energy source, and its development brings new hope to human beings. Photocatalytic technology has become an ideal environmental pollution control technology because it can directly use solar energy for oxidation reaction, and has great application prospects in the fields of energy and environment. [0003] Since Fu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/745B01J23/75C02F1/30C02F1/72C02F101/30
CPCY02W10/37
Inventor 张国亮秦磊陈磊
Owner ZHEJIANG UNIV OF TECH
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