A kind of preparation method of nano wo3/tio2-iron modified zeolite composite photocatalyst

A composite light and catalyst technology, applied in physical/chemical process catalysts, molecular sieve catalysts, chemical instruments and methods, etc., can solve the problems of inconvenient disassembly and recycling, low efficiency of photogenerated carriers, and low utilization rate, etc. The effect of improving efficiency, good degradation effect and simple preparation process

Active Publication Date: 2019-01-25
TONGJI UNIV
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  • Abstract
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AI Technical Summary

Problems solved by technology

Overall, nano-TiO 2 There are still several important problems in the application of semiconductor photocatalytic degradation of organic pollutants: (1) TiO 2 The band gap is wide, 3.2ev, and it can only absorb and utilize ultraviolet light with a wavelength of less than 380nm, which accounts for only 3% to 5% of sunlight, and the utilization rate of light is low; (2) Nano-TiO 2 The photogenerated electrons and holes of the semiconductor are easy to recombine, resulting in TiO 2 The efficiency of photogenerated carriers is low; (3) nanoscale TiO 2 Photocatalyst powder is used in air purifiers, which is inconvenient to disassemble and recycle
However, if only the WO 3 and TiO 2 As a photocatalyst, the composite has good photocatalytic efficiency, but it is not easy to separate it from water

Method used

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  • A kind of preparation method of nano wo3/tio2-iron modified zeolite composite photocatalyst

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Embodiment 1

[0030] Nano WO in this embodiment 3 / TiO 2 -The preparation method of iron-modified zeolite composite photocatalyst, specifically comprises the following steps:

[0031] (1) Disperse 5 g of artificial zeolite A in 50 mL of 10 mol / L NaOH solution, and stir at 100 ° C for 1 hour to form a zeolite precursor;

[0032] (2) Preparation of nano-WO 3 (20nm particle size) and TiO 2 (particle size is 20nm) mixed aqueous solution, and then fully mixed with the zeolite precursor to prepare a mixed gel;

[0033] (3) subjecting the mixed gel to crystallization treatment, and after the crystallization is completed, the intermediate is obtained through separation, washing and drying;

[0034] (4) The intermediate is fully mixed with 50 mL of 4mol / L ferric chloride solution, separated, washed and dried, and then calcined at a high temperature to obtain the nano-WO 3 / TiO 2 - Iron-modified zeolite composite photocatalyst.

[0035] In step (1), the amount of zeolite added in the alkali so...

Embodiment 2

[0041] Nano WO in this embodiment 3 / TiO 2 -The preparation method of iron-modified zeolite composite photocatalyst, specifically comprises the following steps:

[0042] (1) Disperse 10 g of artificial zeolite X in 100 mL of 12 mol / L NaOH solution, and stir at 120 ° C for 3 hours to form a zeolite precursor;

[0043] (2) Preparation of nano-WO 3 (particle size is 40nm) and TiO 2 (particle size is 40nm) mixed aqueous solution, and then fully mixed with the zeolite precursor to prepare a mixed gel;

[0044] (3) subjecting the mixed gel to crystallization treatment, and after the crystallization is completed, the intermediate is obtained through separation, washing and drying;

[0045](4) The intermediate is fully mixed with 100 mL of 5 mol / L ferric nitrate solution, separated, washed and dried, and then calcined at a high temperature to obtain the nano-WO 3 / TiO 2 - Iron-modified zeolite composite photocatalyst.

[0046] In step (1), the amount of zeolite added in the alk...

Embodiment 3

[0052] Nano WO in this embodiment 3 / TiO 2 -The preparation method of iron-modified zeolite composite photocatalyst, specifically comprises the following steps:

[0053] (1) Add the silicon source and the aluminum source into the alkali solution, mix well, and react at 150°C for 3 hours to prepare the zeolite precursor;

[0054] (2) Nano WO 3 (30nm particle size) and TiO 2 (particle size is 30nm) is added in the zeolite precursor, fully mixed, and mixed gel is obtained;

[0055] (3) subjecting the mixed gel to crystallization treatment, and after the crystallization is completed, the intermediate is obtained through separation, washing and drying;

[0056] (4) The intermediate is fully mixed with the iron salt solution, separated, washed and dried, and then calcined at a high temperature to obtain the nano-WO 3 / TiO 2 - Iron-modified zeolite composite photocatalyst.

[0057] In step (1), the molar ratio of silicon source, aluminum source and alkali solution is 1:2:200. ...

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Abstract

The invention relates to a preparing method of a nanometer WO3 / TiO2-iron modified zeolite composite photocatalyst. The method includes (1) adding a silicon source and an aluminum source into an alkali solution, fully mixing, and reacting at 60-150 DEG C for 3-50 h to prepare a zeolite precursor, (2) adding nanometer WO3 and nanometer TiO2 into the zeolite precursor, and fully mixing to prepare mixed gel, (3) subjecting the mixed gel to crystallization treatment, and preparing an intermediate through separating, washing and drying after the crystallization treatment is finished, and (4) fully mixing the intermediate with an iron salt solution, separating, washing, drying, and sintering at a high temperature to obtain the nanometer WO3 / TiO2-iron modified zeolite composite photocatalyst. Compared with the prior art, the method is simple, high in flexibility, and high in the adjustable range of a silicon-aluminum ratio, effectively increases the organic pollutant degradation efficiency of the photocatalyst and has a good application prospect.

Description

technical field [0001] The invention belongs to the technical field of composite photocatalysts, and relates to a method for preparing a photocatalyst, in particular to a nano-WO 3 / TiO 2 -The preparation method of iron-modified zeolite composite photocatalyst. Background technique [0002] With the rapid development of agriculture and industry, a large amount of waste water has caused great harm to the natural environment and human body. Wastewater rich in high concentrations of organic matter has many sources and a large amount of discharge. Untreated or incompletely treated wastewater will cause great harm to the environment. [0003] Photocatalytic reduction is one of the effective methods to remove organic pollutants, especially the technology of visible light removal of organic pollutants is more common. Among them, titanium dioxide has been widely used in the photocatalytic degradation of organic pollutants due to its non-biological toxicity, relatively low price, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/03B01J35/10C02F1/30C02F101/38
CPCY02W10/37
Inventor 刘敏敏于水利侯立安
Owner TONGJI UNIV
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