A photocatalyst of vanadium pentoxide composite titanium dioxide for the degradation of formaldehyde

Abstract

The invention relates to preparation of a composite photocatalyst, and particularly relates to a photocatalytic material which is formed by loading a P25 type nano TiO2 / V2O5 composite on foamed nickel having large specific surface area and has high catalytic degradation performance. The preparation method comprises the following steps: dissolving ammonium metavanadate in water, performing wet milling together with P25, impregnating, loading onto the foamed nickel, drying, and calcining at 500 DEG C for 1 hour, thus obtaining the foamed nickel loaded V2O5 / P25 photocatalytic material. According to the invention, the preparation method is simple; no expensive equipment is required; the raw materials are low in price; the mechanical performance is favorable; and the photocatalytic degradation rate and visible light response range of the prepared catalyst are greatly improved in comparison with P25. When the composite photocatalyst is used for degrading harmful gas such as formaldehyde and the like in rooms and automobiles, the problems that the powdery photocatalyst is difficult to recover and regenerate after use and the like can be avoided.

Description

technical field

[0001] The invention belongs to the field of photocatalysis, and specifically involves using foamed nickel as a load substrate, V 2 o 5 Preparation method of composite titanium dioxide P25 photocatalytic material, and its ability to degrade formaldehyde. Background technique

[0002] Photocatalytic oxidation has become the most promising air purification technology because of its simple technical operation, mild conditions, low energy consumption, and no secondary pollution. Among them, nano-TiO 2 Semiconductor has become a research hotspot in many photocatalysts because of its good chemical stability, corrosion resistance, high activity, low cost, non-toxicity, and no secondary pollution. But TiO 2 The band gap is wide, and only a small amount of ultraviolet light can be absorbed; at the same time, the photon quantum efficiency is low, and it is not easy to recycle and reuse. As a result, its application prospects are limited. Overall, nano-TiO 2 There...

Examples

Embodiment 1

[0023] ν of Example 1 1 4.3×10 -3 mg / L / min, the ν of Example 2 2 3.8×10 -3 mg / L / min, ν of Example 3 3 4.5×10 -3 mg / L / min, ν of Example 4 4 6.8×10 -3 mg / L / min, so: ν 4 > ν3 > ν 2 > ν 1 , and in Examples 5 to 7, the photodegradation of formaldehyde becomes the main reason for the reduction of formaldehyde concentration before the temperature is stabilized (about 30 minutes), so the calculated rate does not match the actual situation, but by figure 1 It can be seen that the effects of these three examples on degrading formaldehyde are similar.

[0024] In the photocatalytic process, compounded V 2 o 5 The degradation rate of the P25 photocatalyst is larger than that of the uncomposited one. at V 2 o 5 / TiO 2 When the compounding ratio is very small, along with the increase of the compounding ratio, the degradation rate increases, and when the compounding ratio reaches 0.12 of embodiment 5, the degradation reaches the maximum, and the compounding reaches the best ef...

technical field

[0001] The invention belongs to the field of photocatalysis, and specifically involves using foamed nickel as a load substrate, V 2 o 5 Preparation method of composite titanium dioxide P25 photocatalytic material, and its ability to degrade formaldehyde. Background technique

[0002] Photocatalytic oxidation has become the most promising air purification technology because of its simple technical operation, mild conditions, low energy consumption, and no secondary pollution. Among them, nano-TiO 2 Semiconductor has become a research hotspot in many photocatalysts because of its good chemical stability, corrosion resistance, high activity, low cost, non-toxicity, and no secondary pollution. But TiO 2 The band gap is wide, and only a small amount of ultraviolet light can be absorbed; at the same time, the photon quantum efficiency is low, and it is not easy to recycle and reuse. As a result, its application prospects are limited. Overall, nano-TiO 2 There...

Examples

Embodiment 1

[0023] ν of Example 1 1 4.3×10 -3 mg / L / min, the ν of Example 2 2 3.8×10 -3 mg / L / min, ν of Example 3 3 4.5×10 -3 mg / L / min, ν of Example 4 4 6.8×10 -3 mg / L / min, so: ν 4 > ν3 > ν 2 > ν 1 , and in Examples 5 to 7, the photodegradation of formaldehyde becomes the main reason for the reduction of formaldehyde concentration before the temperature is stabilized (about 30 minutes), so the calculated rate does not match the actual situation, but by figure 1 It can be seen that the effects of these three examples on degrading formaldehyde are similar.

[0024] In the photocatalytic process, compounded V 2 o 5 The degradation rate of the P25 photocatalyst is larger than that of the uncomposited one. at V 2 o 5 / TiO 2 When the compounding ratio is very small, along with the increase of the compounding ratio, the degradation rate increases, and when the compounding ratio reaches 0.12 of embodiment 5, the degradation reaches the maximum, and the compounding reaches the best ef...

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