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Black TiO2 nano material as well as preparation method and application thereof

A nano-material and black technology, applied in chemical instruments and methods, titanium oxide/hydroxide, light water/sewage treatment, etc., can solve the problems of high energy consumption and high risk of operation process, and achieve simple operation and low cost Effect

Active Publication Date: 2017-06-27
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Black TiO 2 The preparation of nanomaterials is mostly prepared by direct reduction of hydrogen heat treatment, which needs to be carried out under harsh reduction conditions such as high temperature and high pressure, and there are problems such as high risk in the operation process and high energy consumption.

Method used

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  • Black TiO2 nano material as well as preparation method and application thereof
  • Black TiO2 nano material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] First, weigh 2g of dried Arborvitae leaf powder, add 200mL of deionized water, place it in a constant temperature oil bath at 30°C, mix and stir for 2 hours, and then filter to obtain the filtrate. Take 30mL of the filtrate and 20mL of deionized water and add 1140μL, 48.56 MM silver nitrate aqueous solution was stirred at 90°C for 1.0h to obtain a mixed solution, and 0.6g TiO 2 The carrier was added to the obtained mixture (so that the Ag load was 1 wt%), stirred thoroughly for 1 hour, filtered, washed with water, and dried in vacuum. The obtained powder was treated in an air atmosphere at 450°C for 4 hours, and the plant biomass was removed to obtain a powder Catalyst A.

[0026] Photocatalytic degradation of methylene blue: prepare 20mg / L methylene blue solution for photocatalytic degradation reaction in the laboratory, take a certain amount (500mL) of the dye solution and pour it into the reaction kettle, take the initial sample, add the catalyst and absorb it in the...

Embodiment 2

[0028] Catalyst A was prepared according to the method of Example 1, and further treated at 600° C. for 4 hours under a 10% hydrogen / nitrogen mixed atmosphere to obtain catalyst B. Catalyst evaluation conditions are the same as in Example 1, and the catalytic reaction results are shown in Table 1.

Embodiment 3

[0030] Catalyst A was prepared according to the method of Example 1, and further treated at 500° C. for 4 hours under a 10% hydrogen / nitrogen mixed atmosphere to obtain catalyst C. Catalyst evaluation conditions are the same as in Example 1, and the catalytic reaction results are shown in Table 1.

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Abstract

The invention provides a black TiO2 nano material. A preparation method of the black TiO2 nano material comprises the following steps: adding water into dried platycladus orientalis leaf fragments, stirring, then filtering, taking filtrate, adding aqueous solution of a Ag precursor, and then stirring for 1-3 hours at the temperature of 50-90 DEG C, so that a mixed solution is obtained; adding TiO2 powder into the obtained mixed solution, stirring for 1-3 hours, then filtering, and washing and drying a filter cake, so that Ag / TiO2 solid powder is obtained; and in a H2 / N2 mixed atmosphere with the volume fraction of H2 being 5-50%, roasting the obtained Ag / TiO2 solid powder for 3-6 hours at the temperature of 450-800 DEG C, so that the product is obtained. According to the invention, hydrogen spillover on the surface of precious metal Ag is utilized for the first time, reduction is carried out under relatively mild conditions for preparing black TiO2, the preparation method is low in cost and simple in operation, and the obtained black TiO2 nano material has the characteristics of high activity, high stability and the like when being used in reaction for photocatalytic degradation of dye wastewater.

Description

[0001] (1) Technical field [0002] The present invention relates to a kind of black TiO 2 Nanomaterials and their preparation methods and applications, the invention utilizes hydrogen overflow reduction on the surface of Ag nanoparticles to prepare black TiO with high light conversion efficiency 2 nanomaterials, black TiO 2 Nanomaterials can be used for photocatalytic degradation of dye wastewater. [0003] (2) Background technology [0004] Dye pollutants are one of the main sources of global environmental pollution, and the main source of dye wastewater is the large amount of wastewater discharged from the printing and dyeing industry. Due to the high content of organic matter, complex components, and difficulty in degrading this kind of wastewater, traditional treatment methods such as biological treatment, coagulation sedimentation, adsorption and other processes are not ideal for the treatment of dye wastewater, and it is easy to cause secondary pollution. Therefore, i...

Claims

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Application Information

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IPC IPC(8): C02F1/30C01G23/08C02F101/30C02F101/34C02F101/38
Inventor 杜明明王国梁曾淦宁王杰李银晓盛加楠斯鹏松
Owner ZHEJIANG UNIV OF TECH
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