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Preparation method of catalyst capable of magnetic separation

A photocatalyst and magnetic separation technology, applied in catalyst carriers, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of catalyst activity influence, secondary pollution, reduction of catalyst utilization rate, etc., and achieve high-efficiency photocatalytic activity , the effect of avoiding secondary pollution

Inactive Publication Date: 2014-09-17
JIANGSU UNIV
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AI Technical Summary

Problems solved by technology

[0003] For catalysts, catalytic activity is a measure, but its recycling is also very important. Commonly used precipitation methods, filtration methods, etc. cannot quickly and fully separate the catalysts. On the one hand, the utilization rate of the catalyst is reduced. On the other hand, the catalyst Residues in water may also cause secondary pollution, so the separation of catalysts is also a particularly important factor in evaluating catalysts
Using an external magnetic field to magnetically separate catalysts is a good means, and most magnetically recyclable photocatalysts are achieved by doping magnetic materials, such as: a magnetic photocatalyst and its preparation method (patent CN200610124739.9) And a preparation method of magnetic nano-microsphere photocatalytic composite material (patent CN201110367254.3) The process is relatively complicated, and this kind of preparation method often affects the activity of the catalyst

Method used

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  • Preparation method of catalyst capable of magnetic separation
  • Preparation method of catalyst capable of magnetic separation
  • Preparation method of catalyst capable of magnetic separation

Examples

Experimental program
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Effect test

Embodiment 1

[0033] (1) Screening and modification of fly ash, use a 300-mesh sieve to remove oversized particles of fly ash with magnetic properties, weigh 5g of magnetic fly ash (MFACs) into a 250mL three-neck flask, add 120mL of 1M HCl solution. Keep the temperature at 80°C and mechanically stir the reaction for 3 hours. Suction filtration, washing with deionized water until neutral (pH=7), and vacuum drying at 30°C for 12 hours. Acid-activated magnetic fly ash is prepared. Then weigh 3g of acid-activated magnetic fly ash, 10g of APTES and 120.7mL of toluene, pass through nitrogen protection, keep the temperature at 70°C and react with mechanical stirring for 12 hours. Toluene and methanol were washed three times respectively, and vacuum-dried at 30°C for 12 hours to obtain amino magnetic fly ash (NH 2 -MFACs). Then take by weighing 2g amino magnetic fly ash and 3g succinic anhydride and add 49.2mLDMF again, mechanical stirring room temperature reaction 24 hours, DMF and ethanol eac...

Embodiment 2

[0040] (1) According to the method of Example 1 (1), the acid-activated magnetic fly ash was prepared. Then weigh 1g of acid-activated magnetic fly ash, 10g of APTES and 120.7mL of toluene, pass through nitrogen protection, keep the temperature at 70°C and react with mechanical stirring for 12 hours. Toluene and methanol were washed three times respectively, and vacuum-dried at 30°C for 12 hours to obtain amino magnetic fly ash (NH 2 -MFACs). Then take by weighing 0.5g amino magnetic fly ash and 3g succinic anhydride and add 49.2mLDMF again, mechanical stirring room temperature reaction 24 hours, DMF and ethanol each wash three times, 30 ℃ of vacuum drying 12 hours, make carboxyl magnetic fly ash (COOH -MFACs).

[0041] (2) To synthesize cadmium sulfide-magnetic fly ash photocatalyst, weigh 0.1g carboxyl magnetic fly ash and disperse it in 80ml water, then add 0.5g cadmium sulfate, 0.3g thiourea and 5g ammonia water. The reaction was carried out at 60° C. for 3 hours under ...

Embodiment 3

[0043] (1) According to the method of Example 1 (1), the acid-activated magnetic fly ash was prepared. Then weigh 5g of acid-activated magnetic fly ash, 10g of APTES and 120.7mL of toluene into nitrogen protection, keep the temperature at 70°C and react with mechanical stirring for 12 hours. Toluene and methanol were washed three times respectively, and vacuum-dried at 30°C for 12 hours to obtain amino magnetic fly ash (NH 2 -MFACs). Then take by weighing 3g amino magnetic fly ash and 3g succinic anhydride and add 49.2mL DMF again, mechanical stirring room temperature reaction 24 hours, DMF and ethanol each wash three times, 30 ℃ of vacuum drying 12 hours, make carboxyl magnetic fly ash (COOH- MFACs).

[0044] (2) Synthesis of cadmium sulfide-magnetic fly ash photocatalyst, weigh 1g of carboxyl magnetic fly ash and disperse in 80ml of water, then add 0.5g of cadmium sulfate, 0.3g of thiourea and 5g of ammonia water. The reaction was carried out at 60° C. for 3 hours under n...

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Abstract

The invention relates to a preparation method of a catalyst capable of magnetic separation, and belongs to the technical field of environmental material preparation. The preparation method of the catalyst capable of magnetic separation comprises the following steps: by adopting a chemical precipitation method, firstly, screening and modifying coal ash to prepare carboxyl magnetic pulverized coal ash, then mixing uniformly carboxyl magnetic pulverized coal ash, water, cadmium sulfate, thiourea and ammonium hydroxide, introducing nitrogen to react to prepare a CdS-MFACs composite photocatalyst. The preparation method of the magnetic separation catalyst has a relatively degrading effect on antibiotics in waste water, and the main action mechanism for degrading danofloxancin mesylate by the CdS-MFAs composite photocatalysis is discussed by observing the degrading process. The preparation method of the magnetic separation catalyst has the technical advantages that the load-type photocatalyst improves the utilization ratio of the photocatalyst, and reduces secondary pollution caused by using the catalyst in the using process; especially, industrial waste material magnetic pulverized coal ash is adopted as a base body material, not only is the effect of treating waste by waste reached, but also the photocatalyst reclaimed by an applied magnetic field can be prepared simply and easily, and great convenience is provided for the preparation and reclamation of a magnetic photocatalyst.

Description

technical field [0001] The invention relates to a method for preparing a CdS-magnetic fly ash composite photocatalyst by using a chemical deposition method, which belongs to the technical field of environmental material preparation. Background technique [0002] Danoxacin mesylate is a fluoroquinolone antibiotic with strong bactericidal ability and broad-spectrum antibacterial properties. However, its drug resistance and its side effects also seriously affect people's life at the same time, and long-term low-level accumulation is prone to drug resistance; therefore, it is an important link to rationally treat antibiotic and medical wastewater in life and production. At present, photocatalytic technology has been widely used in the research of wastewater treatment in the environment. And developed a large number of photocatalysts, such as titanium dioxide, tungsten trioxide, zinc oxide, cadmium sulfide and so on. Especially for visible light catalysts, due to their good res...

Claims

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Application Information

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IPC IPC(8): B01J27/04B01J32/00C02F1/30C02F103/36C02F101/34C02F101/38
CPCY02W10/37
Inventor 赫明闫永胜逯子扬霍鹏伟
Owner JIANGSU UNIV
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