Preparation method of vanadium and nitrogen co-doped titanium dioxide/activated carbon photocatalyst

Abstract

The invention relates to a preparation method of a vanadium and nitrogen co-doped titanium dioxide / activated carbon photocatalyst. The preparation method comprises the following steps: washing activated carbon which is dried and grinded and then adding into ethanol solution of titanate; stirring to form a titanium source, wherein the activated carbon and titanium dioxide are in the mass ratio of 1:(0.05-0.5), and the stirring time is 4 to 12 hours; adding citric acid and urea into the deionized water in sequence, and stirring to obtain a solution serving as a nitrogen source; adding oxalic acid and ammonium vanadate into the deionized water, and stirring to obtain a solution serving as a vanadium source; mixing the nitrogen source and the vanadium source to obtain an aqueous solution; dripping the aqueous solution into the titanium source dropwise; vigorously stirring, standing, ageing, drying and grinding, and roasting for 4 hours at 400 DEG C in a nitrogen atmosphere. According to the method, the process is simple; the prepared titanium dioxide photocatalyst is high in visible-light activity, high in degradation speed and low in cost.

Description

technical field

[0001] The invention relates to a preparation method of a photocatalyst, in particular to a preparation method of a vanadium and nitrogen co-doped titanium dioxide / activated carbon photocatalyst. Background technique

[0002] As a wide-bandgap semiconductor, titanium dioxide is widely used in the fields of atmospheric and water environment pollutant degradation, antibacterial, deodorization and self-cleaning due to its stable chemical properties and efficient photocatalytic activity. However, the band gap of titanium dioxide (anatase type) is 3.2eV, the absorption wavelength is less than 388nm, and the absorption band is in the ultraviolet region, which seriously restricts its practical application in photocatalysis and other aspects. Doping titanium dioxide with carbon, fluorine, nitrogen, sulfur, vanadium, iron, nickel and other non-metallic elements or transition metals can improve its photocatalytic activity and expand its visible light response range. R...

Examples

Embodiment 1

[0015] Titanate (isopropyl titanate or tetrabutyl titanate) and ethanol were mixed and stirred for 1 h. Add the activated carbon washed with water, dried and ground into the titanate solution, and stir for 4 hours to form a titanium source. The mass ratio of activated carbon and titanium dioxide is 1:0.05. Add citric acid and urea in deionized water in sequence, and stir for 1 h as a nitrogen source. Add oxalic acid and ammonium metavanadate into deionized water and stir for 1 h as vanadium source. The nitrogen source and the vanadium source were mixed into 25 mL of aqueous solution. The aqueous solution was added dropwise to the titanium source, stirred vigorously at 40°C for 2h, left to age for 5 days, dried and ground, and calcined at 400°C for 4h under a nitrogen atmosphere. The molar ratio of titanate to ethanol, citric acid, urea, ammonium metavanadate and oxalic acid is 1:10:2:0.05:0.01:0.02.

[0016] The prepared sulfur-vanadium co-doped supported titanium dioxide ...

Embodiment 2

[0018] Titanate (isopropyl titanate or tetrabutyl titanate) and ethanol were mixed and stirred for 1 h. Add the activated carbon washed with water, dried and ground into the titanate solution, and stir for 4 hours to form a titanium source. The mass ratio of activated carbon and titanium dioxide is 1:0.1. Add citric acid and urea in deionized water in sequence, and stir for 1 h as a nitrogen source. Add oxalic acid and ammonium metavanadate into deionized water and stir for 1 h as vanadium source. The nitrogen source and the vanadium source were mixed into 25 mL of aqueous solution. The aqueous solution was added dropwise to the titanium source, stirred vigorously at 40°C for 2h, left to age for 5 days, dried and ground, and calcined at 400°C for 4h under a nitrogen atmosphere. The molar ratio of titanate to ethanol, citric acid, urea, ammonium metavanadate and oxalic acid is 1:40:2:0.1:0.02:0.04.

[0019] The prepared sulfur-vanadium co-doped supported titanium dioxide ph...

Embodiment 3

[0021] Titanate (isopropyl titanate or tetrabutyl titanate) and ethanol were mixed and stirred for 1 h. Add the activated carbon washed with water, dried and ground into the titanate solution, and stir for 4 hours to form a titanium source. The mass ratio of activated carbon and titanium dioxide is 1:0.2. Add citric acid and urea in deionized water in sequence, and stir for 1 h as a nitrogen source. Add oxalic acid and ammonium metavanadate into deionized water and stir for 1 h as vanadium source. The nitrogen source and the vanadium source were mixed into 25 mL of aqueous solution. The aqueous solution was added dropwise to the titanium source, stirred vigorously at 40°C for 2h, left to age for 5 days, dried and ground, and calcined at 400°C for 4h under a nitrogen atmosphere. The molar ratio of titanate to ethanol, citric acid, urea, ammonium metavanadate and oxalic acid is 1:40:2:0.2:0.03:0.06.

[0022] The prepared sulfur-vanadium co-doped supported titanium dioxide ph...

technical field

[0001] The invention relates to a preparation method of a photocatalyst, in particular to a preparation method of a vanadium and nitrogen co-doped titanium dioxide / activated carbon photocatalyst. Background technique

[0002] As a wide-bandgap semiconductor, titanium dioxide is widely used in the fields of atmospheric and water environment pollutant degradation, antibacterial, deodorization and self-cleaning due to its stable chemical properties and efficient photocatalytic activity. However, the band gap of titanium dioxide (anatase type) is 3.2eV, the absorption wavelength is less than 388nm, and the absorption band is in the ultraviolet region, which seriously restricts its practical application in photocatalysis and other aspects. Doping titanium dioxide with carbon, fluorine, nitrogen, sulfur, vanadium, iron, nickel and other non-metallic elements or transition metals can improve its photocatalytic activity and expand its visible light response range. R...

Examples

Embodiment 1

[0015] Titanate (isopropyl titanate or tetrabutyl titanate) and ethanol were mixed and stirred for 1 h. Add the activated carbon washed with water, dried and ground into the titanate solution, and stir for 4 hours to form a titanium source. The mass ratio of activated carbon and titanium dioxide is 1:0.05. Add citric acid and urea in deionized water in sequence, and stir for 1 h as a nitrogen source. Add oxalic acid and ammonium metavanadate into deionized water and stir for 1 h as vanadium source. The nitrogen source and the vanadium source were mixed into 25 mL of aqueous solution. The aqueous solution was added dropwise to the titanium source, stirred vigorously at 40°C for 2h, left to age for 5 days, dried and ground, and calcined at 400°C for 4h under a nitrogen atmosphere. The molar ratio of titanate to ethanol, citric acid, urea, ammonium metavanadate and oxalic acid is 1:10:2:0.05:0.01:0.02.

[0016] The prepared sulfur-vanadium co-doped supported titanium dioxide ...

Embodiment 2

[0018] Titanate (isopropyl titanate or tetrabutyl titanate) and ethanol were mixed and stirred for 1 h. Add the activated carbon washed with water, dried and ground into the titanate solution, and stir for 4 hours to form a titanium source. The mass ratio of activated carbon and titanium dioxide is 1:0.1. Add citric acid and urea in deionized water in sequence, and stir for 1 h as a nitrogen source. Add oxalic acid and ammonium metavanadate into deionized water and stir for 1 h as vanadium source. The nitrogen source and the vanadium source were mixed into 25 mL of aqueous solution. The aqueous solution was added dropwise to the titanium source, stirred vigorously at 40°C for 2h, left to age for 5 days, dried and ground, and calcined at 400°C for 4h under a nitrogen atmosphere. The molar ratio of titanate to ethanol, citric acid, urea, ammonium metavanadate and oxalic acid is 1:40:2:0.1:0.02:0.04.

[0019] The prepared sulfur-vanadium co-doped supported titanium dioxide ph...

Embodiment 3

[0021] Titanate (isopropyl titanate or tetrabutyl titanate) and ethanol were mixed and stirred for 1 h. Add the activated carbon washed with water, dried and ground into the titanate solution, and stir for 4 hours to form a titanium source. The mass ratio of activated carbon and titanium dioxide is 1:0.2. Add citric acid and urea in deionized water in sequence, and stir for 1 h as a nitrogen source. Add oxalic acid and ammonium metavanadate into deionized water and stir for 1 h as vanadium source. The nitrogen source and the vanadium source were mixed into 25 mL of aqueous solution. The aqueous solution was added dropwise to the titanium source, stirred vigorously at 40°C for 2h, left to age for 5 days, dried and ground, and calcined at 400°C for 4h under a nitrogen atmosphere. The molar ratio of titanate to ethanol, citric acid, urea, ammonium metavanadate and oxalic acid is 1:40:2:0.2:0.03:0.06.

[0022] The prepared sulfur-vanadium co-doped supported titanium dioxide ph...