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Peculiar adsorption migration organic soil compound photocatalyst and mechanical mixing preparation method

A mechanical mixing and mobility technology, which is applied in the direction of catalyst activation/preparation, catalyst carrier, chemical instruments and methods, etc., achieves the effect of low price, simple equipment and avoiding secondary pollution problems

Inactive Publication Date: 2010-06-02
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Preparation and screening of specific adsorption-migration organobentonite for adsorption-photocatalysis technology is a very meaningful and promising exploration, but no similar research has been published by researchers so far

Method used

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  • Peculiar adsorption migration organic soil compound photocatalyst and mechanical mixing preparation method

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preparation example Construction

[0018] The preparation principle of organic bentonite is to utilize the exchangeable cations (Ca 2+ 、Na + 、K + , Mg 2+ ) is exchanged with organic cations, the amount of cations added is 20% to 40% of the cation exchange capacity, and the surfactant used is dodecyltrimethylammonium bromide or cetyltrimethylammonium bromide. The organic soil modified by 20% CEC equivalent of dodecyltrimethylammonium bromide is referred to as 20 dodecyltrimethylammonium bromide, containing 80% of 20 dodecyltrimethylammonium bromide The composite material is referred to as 80-20 dodecyltrimethylammonium bromide, and other materials are referred to by analogy.

[0019] The mechanical grinding method combines the organic bentonite / primitive bentonite with the catalyst mainly due to electrostatic force, van der Waals force, etc., and the ultrasonic-centrifugal method can separate the two to achieve the purpose of recycling and reuse.

Embodiment 1

[0021] Put 5g of bentonite over 40 mesh and 0.3CEC equivalent of dodecyltrimethylammonium bromide into the beaker, add distilled water to keep the water-soil ratio at 8:1, stir and react at 50-80°C for 12h, and the stirring speed is 100r / min, then aged at 60°C for 12h, centrifuged and washed 3 times at a centrifugal speed of 3000r / min, 15min each time, dried at 70°C, and ground through a 40-mesh sieve. Add organic soil and commercial catalyst P25 with a mass ratio of 0.5:1 in a mortar, and mechanically grind for 10 minutes.

Embodiment 2

[0023] Put 20g of bentonite over 100 mesh and 0.4CEC equivalent of cetyltrimethylammonium bromide into the beaker, add distilled water to keep the water-to-soil ratio at 15:1, stir and react at 80°C for 24h, and the stirring speed is 200r / min , then aged at 90°C for 24 hours, centrifuged and washed 4 times at a centrifugal speed of 4000r / min for 15 minutes each time, dried at 80°C, and ground through a 100-mesh sieve. Add organic soil and commercial catalyst P25 with a mass ratio of 4:1 in a mortar, and mechanically grind for 15 minutes.

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Abstract

The invention discloses a peculiar adsorption migration organic soil compound photocatalyst and a mechanical mixing preparation method. The preparation method comprises the following steps: 1) adding 5-20 g of bentonite (sieving by a 40-100 mesh sieve) and a cationic surfactant with the cation exchange capacity of 0.2-0.4 into a beaker, adding distilled water while keeping the ratio of water to bentonite at 8-15:1, stirring to carry out the reaction for 12-24 hours at 50-80 DEG C at the speed of 100-200 r / min, aging for 12-24 hours at 60-90 DEG C, centrifugally washing 3-4 times at the speed of 3000-4000 r / min for 15-20 minutes each time, drying at 70-80 DEG C, grinding, and sieving by a 40-100 mesh sieve to obtain organic soil; 2) and adding the organic soil and a commercial catalyst P25 into a mortar in the mass ratio of 0.5-4:1, and mechanically grinding for 10-15 minutes. The invention has favorable adsorption-migration, overcomes the adverse effect of excessive adsorbent affinity, has the advantages of simple preparation process, favorable adsorption-migration of the adsorbent, high uniformity of the carried TiO2 film, and lower cost, and can be easily used for large-scale industrial production.

Description

technical field [0001] The invention relates to a composite photocatalyst with specific adsorption and migration organic soil and a preparation method for mechanical mixing. Background technique [0002] Faced with the serious problem of indoor VOCs pollution, people have adopted a variety of methods to deal with it. In summary, these methods can be divided into two categories: one is non-destructive methods, and the other is destructive methods. The former includes adsorption methods and improving ventilation conditions, while photocatalytic materials with good stability, high reactivity, and low price and non-toxicity have become the main representatives of destructive treatment methods. Combining high-efficiency adsorbents with catalysts and attempting to prepare adsorption-photocatalytic integrated functional materials has become an important research direction for VOCs in photocatalytic treatment chambers at home and abroad. Various activated carbon materials with large...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/06B01J37/04B01J32/00
Inventor 沈学优陈侠胜刘建磊陈坤洋白鸽
Owner ZHEJIANG UNIV
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