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Synthetic method for supported silver phosphate/silver catalyst

A synthesis method, silver phosphate technology, applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., to achieve the effects of improving utilization efficiency, ensuring stability, and increasing adsorption capacity

Inactive Publication Date: 2012-08-01
苏州拓丰市政工程有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, silver phosphate is a solid salt, and it is difficult to fix it directly between the bentonite layers.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Take by weighing 1mmol silver nitrate, be configured into 10mmol / L solution, add dropwise dilute ammonia water in this solution, shake while dropping, until the precipitation that appears at first just dissolves completely again, obtain silver ammonia solution; Take by weighing 20 g bentonite, Add 80 mL of distilled water to soak for 10 hours, add the previously obtained silver ammonia solution to the soaked bentonite suspension, stir while adding, continue stirring for 3 hours after the addition is completed, and age in a water bath at 80°C for 24 hours after stirring. After aging, wash with water 4 times, add 30mL of distilled water; add 0.01mol / L phosphoric acid dropwise, stir while adding dropwise, continue stirring for 4h after the dropwise addition is completed, the molar ratio of the amount of phosphoric acid added to the silver nitrate used is 1: 3. Aging in a water bath at 60°C for 24 hours after stirring, and washing with water several times after aging until t...

Embodiment 2

[0018] Weigh 1.2 mmol of silver nitrate, configure it into a 15 mmol / L solution, add dilute ammonia water dropwise to the solution, and oscillate while adding dropwise, until the initial precipitate just dissolves completely, to obtain a silver ammonia solution; weigh 20 g Bentonite, add 100 mL of distilled water and soak for 12 h, add the previously obtained silver ammonia solution into the soaked bentonite suspension, stir while adding, continue stirring for 4 h after the addition is completed, and place in a water bath at 85 Aging at ℃ for 24 hours, washing with water 5 times after aging, adding 30mL of distilled water; adding 0.1 mol / L phosphoric acid to it, stirring while dropping, and continuing to stir for 4 hours after the addition is completed, the amount of phosphoric acid added is the same as that of the silver nitrate used The molar ratio is 1:3. After the stirring, it is aged in a water bath at 65 °C for 24 hours. After the aging, it is washed several times with wa...

Embodiment 3

[0021] Weigh 1.1mmol of silver nitrate, configure it into a 12 mmol / L solution, add dilute ammonia water dropwise to the solution, and oscillate while adding dropwise, until the initial precipitate just dissolves completely, to obtain a silver ammonia solution; weigh 20 g Bentonite, add 90 mL of distilled water to soak for 11 h, add the previously obtained silver ammonia solution into the soaked bentonite suspension, stir while adding, continue stirring for 4 h after the addition is completed, and place in a water bath at 82 Aging at ℃ for 24 hours, washing with water for 4 times after aging, adding 40 mL of distilled water; adding 0.05 mol / L phosphoric acid dropwise, stirring while adding, and continuing to stir for 4 hours after the addition, the amount of phosphoric acid added and the silver nitrate used The molar ratio of the mixture is 1:3. After stirring, it is aged in a water bath at 62 °C for 24 hours. After aging, it is washed several times with water until the superna...

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PUM

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Abstract

The invention discloses a synthetic method for a supported silver phosphate / silver catalyst. The synthetic method includes steps of weighing 1-1.2mmol of silver nitrate to prepare 10-15mmol / L of solution at first and dripping weak aqua ammonia into the solution to obtain Tollens' reagent; then weighing 20g of bentonite; adding 80-100mL of distilled water into the bentonite to immerse the bentonite for 10 hours to 12 hours so as to obtain bentonite suspension; dripping the Tollens's reagent into the bentonite suspension, stirring, ageing in water bath at the temperature ranging from 80 DEG C to 85 DEG C for 24 hours, washing by four times to five times, and adding 30-50mL of distilled water; dripping 0.01-0.1mol / L of phosphoric acid in a product, stirring for 4 hours, leading the mole ratio of the adding quantity of the phosphoric acid to the used quantity of the silver nitrate to be 1:3, ageing in water bath at the temperature ranging from 60 DEG C to 65 DEG C for 24 hours after stirring is finished, and repeatedly washing until supernate is neutral; and finally drying at the temperature of 105 DEG C, grinding, and irradiating under an xenon lamp with the power of 400-500w for 50-80 minutes so as to obtain the supported silver phosphate / silver catalyst. Utilization efficiency to natural light is increased, stability of a system is guaranteed, a nanometer laminated structure of the bentonite is utilized, accordingly, absorption ability of the catalyst and a carrier is improved, and degradation efficiency is increased.

Description

[0001] technical field [0002] The invention relates to a synthesis method of a loaded silver phosphate / silver photocatalyst, belonging to the technical field of sewage treatment in environmental protection. Background technique [0003] Traditional water treatment methods have problems such as low efficiency, high cost, and secondary pollution, and sewage treatment has not been well resolved. The development and application of nanotechnology is likely to completely solve this problem. In 1972, A. Fujishima and K. Honda in the n-type semiconductor TiO 2 The photocatalytic decomposition of water was discovered on the electrode, and since then a large number of photocatalytic degradation of organic matter in wastewater has been studied. [0004] In June 2010, researchers from the Material Research Institute found that silver phosphate has the effect of photocatalyst, and the photooxidation effect is more than ten times that of various known photocatalysts. However, due to ...

Claims

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Application Information

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IPC IPC(8): B01J27/18C02F1/30
Inventor 马建锋李定龙崔冰莹杨彦张天立
Owner 苏州拓丰市政工程有限公司
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