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Preparation method of titanium dioxide nanosheet-diatomite composite photocatalyst

A technology of titanium dioxide and diatomaceous earth, applied in physical/chemical process catalysts, chemical instruments and methods, separation methods, etc., can solve the problems of reducing the degradation efficiency of formaldehyde gas, low photocatalytic efficiency, etc., to improve efficiency and improve refractive performance. , Enhance the effect of pearlescent effect

Inactive Publication Date: 2017-03-15
FIRST NEW MATERIAL TECH DEV
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Problems solved by technology

[0005] Based on the problems existing in the above-mentioned prior art, the present invention provides a method for preparing a composite photocatalyst of titanium dioxide nanosheets and diatomite, which can solve the problem of photocatalysts formed by titanium dioxide nanoparticles or titanium dioxide nanoparticles and diatomite. The catalytic efficiency is low and the degradation efficiency of formaldehyde gas is also reduced

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  • Preparation method of titanium dioxide nanosheet-diatomite composite photocatalyst

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[0015] An embodiment of the present invention provides a method for preparing a titanium dioxide nanosheet and diatomite composite photocatalyst, comprising:

[0016] Diatomaceous earth pretreatment:

[0017] Pickling treatment of diatomite: put diatomite in a container, add deionized water, then add concentrated hydrochloric acid, reflux reaction for 5h under magnetic stirring, then suction filter, wash with deionized water and absolute ethanol respectively Three times until there is no chloride ion, vacuum-dry at 100°C, and obtain pretreated diatomite after drying;

[0018] Preparation of composite photocatalyst:

[0019] Disperse the pretreated diatomite in absolute ethanol, add titanium tetraisopropoxide, transfer it to a polytetrafluoroethylene-lined hydrothermal reactor, and then add it dropwise to the reactor with a mass concentration of 40% hydrofluoric acid, seal the polytetrafluoroethylene-lined hydrothermal reaction kettle, keep it warm at 160-220°C for 24-50 hour...

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Abstract

The invention discloses a preparation method of a titanium dioxide nanosheet-diatomite composite photocatalyst. The method comprises the following steps: pretreatment: putting diatomite into a container, adding deionized water and concentrated hydrochloric acid, carrying out reflux reaction for 5 hours under magnetic stirring, carrying out vacuum filtration, respectively washing with deionized water and anhydrous ethanol three times until no chlorine ion exists, and carrying out vacuum drying at 100 DEG C to obtain pretreated diatomite; and preparation of photocatalyst: dispersing the pretreated diatomite in anhydrous ethanol, adding titanium tetraisopropylate, transferring into a teflon-lined hydrothermal reaction kettle, dropwisely adding hydrofluoric acid into the reactor, sealing the teflon-lined hydrothermal reaction kettle, keeping the temperature at 160-220 DEG C for 24-50 hours, filtering the reaction product, washing and drying to obtain the titanium dioxide nanosheet-diatomite composite photocatalyst. The complementation of the advantages of high dispersity and pearly luster of composite photocatalyst is achieved, and the formaldehyde degradation efficiency can be effectively enhanced.

Description

technical field [0001] The invention relates to the field of preparation of composite photocatalysts, in particular to a method for preparing composite photocatalysts of titanium dioxide nanosheets and diatomite. Background technique [0002] As a photocatalyst, nano-titanium dioxide has the advantages of high photocatalytic activity, stable chemical properties, safe use, non-toxic and harmless, and has obvious potential advantages in the field of environmental protection. However, titanium dioxide photocatalytic materials prepared by chemical methods are often highly dispersed fine powders, which have problems such as poor dispersion, difficulty in recycling, and poor performance when used directly. Moreover, when it is applied to coatings and other fields, the photocatalytic effect will drop sharply due to the coating of part of the titanium dioxide particles. [0003] Diatomite has a high specific surface area, can absorb various organic and inorganic pollutants, has exc...

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Application Information

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IPC IPC(8): B01J21/06B01D53/86B01D53/72
CPCB01D53/8668B01J21/063B01D2258/06B01J35/39Y02C20/30
Inventor 余雪娇张仁哲
Owner FIRST NEW MATERIAL TECH DEV
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