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Novel visible catalyst-silver phosphate and preparation method thereof

A photocatalyst and silver phosphate technology, applied in the field of photocatalysis, can solve the problems of non-absorption of visible light and large band gap, and achieve the effect of improved photocatalytic activity, simple and easy preparation method, and conducive to large-scale promotion

Inactive Publication Date: 2010-02-17
FUZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The object of the invention is to provide a novel visible light catalyst Ag 3 PO 4 And preparation method thereof, the present invention solves TiO in the prior art 2 Ag 3 PO 4 Applied in the field of photocatalysis, and the preparation method is simple and easy, does not require complex and expensive equipment, and the synthesis conditions are mild

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  • Novel visible catalyst-silver phosphate and preparation method thereof
  • Novel visible catalyst-silver phosphate and preparation method thereof
  • Novel visible catalyst-silver phosphate and preparation method thereof

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preparation example Construction

[0013] The preparation steps of the present invention are as follows:

[0014] (1) The preparation steps of silver ammonia solution are: dissolve 0.05-0.50mol silver nitrate solid in 200mL deionized water, stir for 10 minutes to obtain 200mL silver nitrate solution with a concentration of 0.25-2.5mol / L; take another 1-10mL Concentration is the strong ammonia water of 25.0w%, add deionized water and dilute to 50mL, the ammonia solution that will make is dripped in the above-mentioned silver nitrate solution slowly, when the color of solution just becomes colorless, stop dripping, continue to stir for 10 Minutes to obtain a colorless and transparent silver ammonia solution with a concentration of 0.2-2.0mol / L;

[0015] (2) Dissolve 0.02 to 0.2 mol of sodium dihydrogen phosphate solid in 100 mL of deionized water, stir for 10 minutes to obtain 100 ml of sodium dihydrogen phosphate solution with a concentration of 0.2 to 2.0 mol / L and transfer it to the dropping funnel, Slowly dr...

Embodiment 1

[0019] Preparation of Novel Visible Light Catalysts

[0020] Weigh 0.15mol AgNO 3 The solid was dissolved in 200 mL of deionized water and stirred for 10 minutes to obtain AgNO 3 solution; in addition, use a pipette to measure 3mL of concentrated ammonia water (25%) and add 47ml of deionized water to dilute, stir evenly and slowly drop into the above AgNO 3 Solution, continue stirring for 10 minutes after the dropwise addition, to obtain a colorless and transparent silver ammonia solution. Weigh another 0.05mol NaH 2 PO 4 The solid was dissolved in 100 mL deionized water and stirred for 10 minutes to obtain NaH 2 PO 4 solution and transfer it to the dropping funnel, control the rate of addition (2-3 seconds per drop), slowly add dropwise to the above-mentioned silver ammonia solution, continue stirring for 5-6 hours after the addition, and centrifuge the obtained yellow turbid solution, Washing, drying at 60°C, and grinding to obtain yellow Ag 3 PO 4 powder. figure 1 ...

Embodiment 2

[0022] Novel Visible Light Catalyst Ag 3 PO 4 Degradation of rhodamine B

[0023] Ag will be obtained 3 PO 4 The powder was used as a photocatalyst to degrade Rhodamine B. Weighed 80 mg sample and added 80 mL RhB solution (10-5 mol / L), and stirred for 1 hour in the dark, so that the RhB solution reached adsorption / desorption equilibrium on the surface of the catalyst. Then turn on the light source to carry out the photocatalytic reaction, take 3mL of the reaction solution every 5min, and after centrifugation, the supernatant is detected by a Cary-500 spectrophotometer. The change of RhB concentration during the degradation process was determined according to the absorbance value at 554nm of the sample. The light of the reaction is a 500W halogen tungsten lamp placed in a double glass jacket (through condensed water), and a filter is used to ensure that the incident light is visible light (420nm image 3 As shown, it can be seen from the figure that when no catalyst is added...

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Abstract

The present invention provides a novel visible catalyst-silver phosphate and a preparation method thereof, solving the problems of wide TiO2 forbidden band, no absorbability of visible weakness, and the like in the prior art and applying Ag3PO4 to the field of photocatalysis for the first time. In the invention, a silver ammonia solution for replacing a silver nitrate solution is used as a silversource, the reaction of silver ions and phosphate ions is slowed, and then the catalyst is obtained and has the effect of high-efficiency photocatalytic degradation. The preparing method of the invention is simple and is favorable to extensive popularization.

Description

technical field [0001] The invention belongs to photocatalytic technology in environmental treatment, in particular to a novel visible light catalyst silver phosphate and a preparation method thereof. technical background [0002] The use of photocatalysis to eliminate and degrade pollutants is one of the most active research fields at present, and many semiconductor photocatalysts have been researched and developed. Among them, nano-TiO 2 Due to its low cost, non-toxicity, high stability, good catalytic performance and recyclable utilization, it has attracted widespread attention. However, due to the anatase TiO 2 , the bandgap width is wide, and it needs to be excited by the ultraviolet light of λ<387.5nm to show catalytic activity, and the energy of the ultraviolet light region in sunlight is less than 5% of the total energy, while the visible light with lower energy accounts for the total energy. most of the energy. Therefore, the development of new visible light ...

Claims

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Application Information

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IPC IPC(8): B01J27/18C01B25/37A62D3/17A62D101/20
Inventor 付贤智苏文悦刘长安刘平戴文新李朝晖陈旬王绪绪
Owner FUZHOU UNIV
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