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Diatomite-based composite material and preparation method thereof

A composite material and diatomite technology, applied in the field of photocatalysis, can solve the problems such as the catalytic purification effect of diatomite photocatalyst can not meet the requirements, etc., and achieve the effect of excellent photocatalytic effect

Inactive Publication Date: 2019-02-12
CHONGQING TECH & BUSINESS UNIV
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  • Summary
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  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0004] However, with the increasingly stringent requirements for environmental protection, higher performance requirements have been put forward for various environmental control materials. TiO 2 / The catalytic purification effect of diatomite photocatalyst has gradually failed to meet the requirements, how to improve its catalytic purification efficiency has become an urgent problem to be solved

Method used

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  • Diatomite-based composite material and preparation method thereof
  • Diatomite-based composite material and preparation method thereof
  • Diatomite-based composite material and preparation method thereof

Examples

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preparation example Construction

[0047] The present invention also provides a method for preparing the diatomite-based composite material described in the above technical solution, comprising the following steps:

[0048] a) depositing and growing graphene on diatomite by chemical vapor deposition to obtain a graphene-diatomite composite;

[0049] b) hydrothermally reacting the graphene-diatomite composite with a titanium source compound and a bismuth source compound to obtain a diatomite-based composite material.

[0050] According to the present invention, the graphene is deposited and grown on the diatomite by chemical vapor deposition to obtain the graphene-diatomite composite.

[0051] Wherein, the type, source, and dosage ratio of diatomite to graphene are consistent with those described in the above technical solution, and will not be repeated here.

[0052] In the present invention, the diatomite is preferably purified before chemical vapor deposition. The purification operation, condition parameter...

Embodiment 1

[0064] 1.1 Sample preparation

[0065] Get 5g diatomaceous earth and add in the there-necked flask that contains 50mL deionized water under magnetic stirring condition, then dropwise add 50g sulfuric acid solution (concentration is 40wt%), be placed in oil bath then, at 100 ℃, magnetic stirring reaction After 4 hours, 75 mL of deionized water was added, and the reaction was continued for 1 hour to obtain acid-treated diatomite. The resulting acid-treated diatomite was filtered and washed with deionized water until the pH was 7, then placed in a tube furnace and calcined at 450°C for 3 hours to obtain a white solid powder, which was pure diatomite.

[0066] In a tube furnace, 0.7g of pure diatomite was heated from room temperature to 1000°C under argon and hydrogen conditions, and after heating for 87 minutes, methane gas was introduced (the volume ratio of argon, hydrogen and methane was 100:10 : 1), diatomite was reacted at 1000° C. for 1 hour, then the supply of methane and...

Embodiment 2

[0086] Diatomite, the composite material obtained in Example 1, the composite material obtained in Comparative Example 1, and the composite material obtained in Comparative Example 2 were tested for photocatalytic activity, as follows:

[0087] Weigh 0.10g of samples respectively and place them in a beaker, add 30mL of deionized water, ultrasonically disperse for 5min, then transfer to a glass disc with a diameter of 12cm (place two in parallel when measuring the activity), and dry at 60°C for later use. The above-mentioned samples loaded in glass discs were placed in a continuous flow reactor to determine the photocatalytic purification of NO x performance.

[0088] The specific test process is as follows:

[0089] Place the glass disc loaded with the sample in a 5.4L cuboid (30cm×15cm×12cm) photocatalytic reactor, cover the upper surface of the reactor with quartz glass to seal, place a 150W metal halide lamp above the quartz glass, and install an ultraviolet light under th...

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Abstract

The invention provides a diatomite-based composite material and a preparation method thereof. The diatomite-based composite material is prepared from active components and a carrier; the active components are nano TiO2, nano Bi monomers and graphene; the carrier is diatomite. According to the diatomite-based composite material and the preparation method thereof, the diatomite is taken as the carrier, and the nano TiO2, the nano Bi monomers and the graphene taken as the active components, wherein Bi monomer particles and nano TiO2 are compounded to form heterojunction; separation of photo-induced electrons and improvement of photocatalytic property are facilitated through the plasma effect; meanwhile, the graphene carried by the diatomite-based material can be matched with TiO2 particles toimprove the conductivity; the three active components achieve the synergistic effect on the diatomite carrier, so that the photocatalytic efficiency of the material is remarkably improved, and the removal effect on NOx is enhanced.

Description

technical field [0001] The invention relates to the technical field of photocatalysis, in particular to a diatomite-based composite material and a preparation method thereof. Background technique [0002] Diatomite is one of China's important non-metallic mineral resources, and its proven reserves rank second in the world and first in Asia. Diatomaceous earth is deposited on the bottom of the water by the remains of diatoms growing in ocean lakes, and is gradually deposited by the natural environment. The main mineral composition is its opal and its variants, and the chemical composition is mainly SiO 2 , and contains a small amount of Al 2 o 3 , Fe 2 o 3 , CaO, N 2 O, MgO, etc. There are many types of diatomaceous earth, mainly including straight chain type, round sieve type, crown disk type, and feather pattern type. Diatomite has many excellent properties such as light weight, large specific surface area, high porosity, strong liquid adsorption capacity, and high c...

Claims

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Application Information

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IPC IPC(8): B01J23/18B01D53/56B01D53/86
CPCB01D53/8628B01J23/18B01J35/33B01J35/39
Inventor 刘晓英姜德彬张育新董帆张贤明柳云骐王金淑封丽
Owner CHONGQING TECH & BUSINESS UNIV
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