Preparation method of micron-order load type TiO2 catalyst

A micron-scale, supported technology, applied in molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve problems such as difficulty in meeting the requirements of photocatalytic degradation reactions, low quantum yield, and difficulty in particle separation. The effect of delaying the hydrolysis-polycondensation reaction, simplifying the preparation process and improving the load fastness

Active Publication Date: 2013-02-06
TIANJIN URBAN CONSTR COLLEGE
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to nanoscale TiO 2 Particles are difficult to separate from aqueous media, which limits the size of nano-sized TiO 2 Application of Catalyst in Practical Water Treatment Process
Micron-sized large particle size TiO 2 Easy to separate from aqueous media, but difficult to meet the requirements of photocatalytic degradation reaction due to low quantum yield

Method used

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  • Preparation method of micron-order load type TiO2 catalyst

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preparation example Construction

[0025] Such as figure 1 As shown, the micron-scale supported TiO of the present invention 2 The preparation method of catalyst comprises the following steps:

[0026] (1) Activation pretreatment of the carrier

[0027] Using micron-sized MCM-41 mesoporous molecular sieve as micron-sized supported TiO 2 Catalyst carrier, the MCM-41 mesoporous molecular sieve is placed in a muffle furnace, and the heat treatment and activation of the MCM-41 mesoporous molecular sieve is carried out by using a heat treatment crystallization forming step temperature rise and heat preservation method. The activation step is: heating up to within 1h-2h 200°C-250°C, constant temperature for 1h-2h; then heat up to 350°C-400°C within 1h-2h, constant temperature for 1h-2h; finally heat up to 550°C-600°C within 1h-2h, constant temperature for 4h-6h ;

[0028] (2) Preparation of butyl titanate hydrolysis buffer

[0029] Add 8.52 mL of concentrated hydrochloric acid with a mass fraction of 36% to 38% ...

Embodiment 1

[0037] Example 1 Loading capacity 20% micron-sized loaded TiO 2 Catalyst preparation

[0038] Mix 10mL butyl titanate and 10mL absolute ethanol to form A solution and place it in a pear-shaped separating funnel, take 2.1ml distilled water and 5ml hydrolysis buffer and mix thoroughly to form C component and place it in a pear-shaped separating funnel , then weigh 9.40g of activated MCM-41 molecular sieve and 100ml of butyl titanate hydrolysis buffer, mix them in a beaker, disperse ultrasonically for 20min to form component B, put it on a magnetic stirrer, start stirring, and add dropwise to component B For component A, add component C dropwise after 2 minutes. The dropping speed of component A is about 60-90 drops / min. At the initial stage of dropping, first add component A dropwise, and after 2 minutes, start to add component C dropwise, and the dropping rate of component C is 20-30 drops / min. Use ultrasonic waves to treat the butyl titanate hydrolysis system intermittently...

Embodiment 2

[0039] Example 2 Loading capacity 30% micron-sized loaded TiO 2 Catalyst preparation

[0040] Mix 10mL butyl titanate and 10mL absolute ethanol to form A solution and place it in a pear-shaped separating funnel, take 2.1ml distilled water and 5ml hydrolysis buffer and mix thoroughly to form C component and place it in a pear-shaped separating funnel , then weigh 5.48g of activated MCM-41 molecular sieves and 50ml of butyl titanate hydrolysis buffer, mix them in a beaker, and disperse ultrasonically for 15 minutes to form component B. Put it on a magnetic stirrer, start stirring, and add dropwise to component B For component A, add component C dropwise after 2 minutes. The dropping speed of component A is about 60-90 drops / min. At the initial stage of dropping, first add component A dropwise, and after 2 minutes, start to add component C dropwise, and the dropping rate of component C is 20-30 drops / min. Use ultrasonic waves to treat the butyl titanate hydrolysis system inter...

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Abstract

The invention provides a preparation method of a micron-order load type TiO2 catalyst. The preparation method comprises the following steps: preprocessing a carrier, preparing hydrolysis buffer solution, and preparing the micron-order load type TiO2 catalyst. According to the preparation method, a micron-order MCM-41 mesoporous molecular sieve is taken as a carrier, TiO2 nanometer crystals are generated in situ in pore passages of the carrier through adopting a sol-gel method, and the mass ratio of TiO2 nanometer crystals ranges from 20% to 70%. The MCM-41 mesoporous molecular sieve and TiO2 are coupled to be prepared into the high-activity micron-order load type TiO2 catalyst, so that the dispersity of nanometer TiO2 powder in water media is improved, nanometer TiO2 powder is easy to separate and recover, the photocatalytic activity of TiO2 photocatalyst can be effectively improved, the recovery rate of TiO2 photocatalyst can achieve 100% by adopting a microporous filter membrane to filter and recover TiO2 photocatalyst.

Description

technical field [0001] The invention relates to inorganic functional materials and fine chemical preparation technology, and is a kind of micron-scale loaded TiO 2 Catalyst preparation method. Background technique [0002] Photocatalytic technology is an emerging green water treatment technology. It has outstanding advantages such as mild reaction conditions, the ability to mineralize most organic matter and eliminate heavy metal ion pollution. It has become an effective method for treating refractory wastewater. Among many semiconductor oxides, TiO 2 Because of its high efficiency, non-toxic, stable chemical properties, etc., it has unique advantages in the treatment of refractory organic matter mineralization and removal of heavy metal ion toxicity, and is a promising water treatment technology. [0003] Nano-sized TiO 2 The catalyst has the characteristics of quantum size effect and quantum tunneling effect, and has high photon quantum efficiency and photocatalytic act...

Claims

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Application Information

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IPC IPC(8): B01J29/03B01J35/10C02F1/30
Inventor 费学宁解立平刘玉茹董业硕姜远光
Owner TIANJIN URBAN CONSTR COLLEGE
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