CN104549195A - Preparation method of titanium dioxide magnesium oxide-doped compound photocatalyst - Google Patents

Abstract

The invention relates to a preparation method of a titanium dioxide magnesium oxide-doped compound photocatalyst, and belongs to the field of fine chemical engineering. The method comprises the following steps: dissolving tetraethyl titanate and glacial acetic acid with 20mL of absolute ethyl alcohol under the water area condition at 60 DEG C, and stirring to obtain a uniform yellow solution; adding magnesium oxide and distilled water to another reaction bottle, mixing and shaking evenly; slowly dropwise adding the solution to a tetraethyl titanate reaction bottle, stirring evenly, and adjusting the pH to be 2.5; putting the solution into a microwave apparatus for irradiation, standing at room temperature, and ageing to obtain gel; and drying the gel, grinding into powder, and carrying out thermal treatment to obtain the titanium dioxide magnesium oxide-doped compound photocatalyst. The method is short in reaction time, relatively low in cost, and easy to produce in large scale.

Description

A kind of titania additive magnesia composite photo-catalyst preparation method

Technical field

The invention belongs to field of fine chemical, relate to a kind of titania additive magnesia composite photo-catalyst preparation method.

Background technology

In today that economic height is sent out, earth resource constantly reduces, and environmental pollution is extremely serious, and people are that searching novel energy and Environment control do huge effort.Since Fujishima and Honda in 1972 finds the hydrolysis of silica electrode, photocatalysis causes the very big concern in each field such as chemistry, physics at this point.Titanium dioxide has chemistry and thermal stability is good, nontoxic, the features such as the good and long service life of catalytic performance are widely used, but research finds, also there are some shortcomings in titanium dioxide: adsorption capacity is poor, and cost of manufacture is high, greater band gap, the larger ultraviolet of energy can only be absorbed, to visible light-responded poor ability.In order to solve many drawbacks of titanium dioxide, people's research is carried out modification to titanium dioxide and is made large quantity research, titania modifiedly comprises noble metal loading, semiconductor coupling and dye sensitization etc., and wherein ion doping is one of the most effective method of modifying.Ion doping method mainly contains colloidal sol---gel method, ion implantation, photochemical precipitation method, hydro-thermal method etc., these method Production Times are long, harsh to equipment requirement, unsuitable large-scale production, the present invention discloses a kind of titania additive magnesia composite photo-catalyst preparation method, simple to operate, the technological reaction time is short, can be mass-produced.

Summary of the invention

The present invention is directed to the deficiency on technology today, provide a kind of titania additive magnesia composite photo-catalyst preparation method, this method technique is simple, and cost is lower, and easy scale changes into product.

In order to reach above-mentioned purpose, the concrete technical scheme of employing is:

(1) under 60 DEG C of water area conditions, in reaction bulb, add 10g tetraethyl titanate, 10mL glacial acetic acid 20mL anhydrous alcohol solution, stir 30-50 minute, obtain uniform yellow solution;

(2) another answer in bottle add 5g magnesia, 20mL distilled water mixing shake up, solution is slowly added dropwise in the reaction bulb described in (1), stirs, add 2mol/L nitric acid regulate pH2.5;

(3) microwave frequency again solution being put into microwave instrument 2450MHz irradiates 30 minutes, and be placed to room temperature, ageing obtains colloid;

(4) by colloid as in vacuum drying oven, in vacuum drying oven, 80 DEG C of oven dry, obtain xerogel;

(5) by gel pulverize, put into muffle furnace and calcine 1-2 hour.Be cooled to room temperature, fine gtinding obtains titania additive magnesia composite photo-catalyst.

Application process of the present invention is:

(1) under 60 DEG C of water area conditions, in reaction bulb, add 10g tetraethyl titanate, 10mL glacial acetic acid 20mL anhydrous alcohol solution, stir 30-50 minute, obtain uniform yellow solution;

(2) another answer in bottle add 5g magnesia, 20mL distilled water mixing shake up, solution is slowly added dropwise in the reaction bulb described in (1), stirs, add 2mol/L nitric acid regulate pH2.5;

(3) microwave frequency again solution being put into microwave instrument 2450MHz irradiates 30 minutes, and be placed to room temperature, ageing obtains colloid;

(4) by colloid as in vacuum drying oven, in vacuum drying oven, 80 DEG C of oven dry, obtain xerogel;

(5) by gel pulverize, put into muffle furnace and calcine 1-2 hour.Be cooled to room temperature, grinding obtains titania additive magnesia composite photo-catalyst.

Specific embodiments:

In reaction bulb, 10g tetraethyl titanate is added under 60 DEG C of water area conditions, 10mL glacial acetic acid 20mL anhydrous alcohol solution, stir 30-50 minute, obtain uniform yellow solution, answer in bottle at another and add 5g magnesia, the mixing of 20mL distilled water shakes up, solution is slowly added dropwise in a upper reaction bulb, stir, the nitric acid adding 2mol/L regulates pH2.5, the microwave frequency again solution being put into microwave instrument 2450MHz irradiates 30 minutes, be placed to room temperature, ageing obtains colloid, by colloid as in vacuum drying oven, 80 DEG C of oven dry in vacuum drying oven, obtain xerogel, by gel pulverize, put into muffle furnace and calcine 1-2 hour.Be cooled to room temperature, grinding obtains titania additive magnesia composite photo-catalyst.

Example 1

The dusty gas of 1 cube is gathered in the waste gas got rid of in chemical industry field, in gas, the content of S is 232mg/L after testing, above-mentioned obtained titania additive magnesia composite photo-catalyst to be placed in dusty gas sample 1 hour, the content recording S is 2.3mg/L, and clearance is 99%.

Example 2

The dusty gas of 1 cube is gathered in the waste gas got rid of in chemical industry field, in gas, the content of S is 287mg/L after testing, above-mentioned obtained titania additive magnesia composite photo-catalyst to be placed in dusty gas sample 1 hour, the content recording S is 1.9mg/L, and clearance is 99%.

Example 3

The dusty gas of 1 cube is gathered in the waste gas got rid of in chemical industry field, in gas, the content of S is 152mg/L after testing, above-mentioned obtained titania additive magnesia composite photo-catalyst to be placed in dusty gas sample 1 hour, the content recording S is 0.80mg/L, and clearance is 99%.

Claims (1)

1. a titania additive magnesia composite photo-catalyst preparation method, is characterized in that:

(1) under 60 DEG C of water area conditions, in reaction bulb, add 10g tetraethyl titanate, 10mL glacial acetic acid 20mL anhydrous alcohol solution, stir 30-50 minute, obtain uniform solution;

(2) in another reaction bulb, add 5g magnesia, the mixing of 20mL distilled water shakes up, be slowly added dropwise to by solution in the reaction bulb described in (1), stir, the nitric acid adding 2mol/L regulates pH2.5;

(3) microwave frequency again solution being put into microwave instrument 2450MHz irradiates 30 minutes, and be placed to room temperature, ageing obtains colloid;

(4) by colloid as in vacuum drying oven, in vacuum drying oven, 80 DEG C of oven dry, obtain xerogel;

(5) by gel pulverize, put into muffle furnace and calcine 1-2 hour.Be cooled to room temperature, grinding obtains titania additive magnesia composite photo-catalyst.