Method for preparing polymer heterogeneous Fenton-like catalyst-polyvinylidene fluoride (PVDF) catalytic membrane

A polymer and catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, organic compound/hydride/coordination complex catalysts, etc. and other problems, to achieve the effect of simple method, easy operation and large specific surface area

Inactive Publication Date: 2011-04-06
HARBIN INST OF TECH
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to load iron ions on the PVDF membrane, which solves the problem of difficult recovery of iron ions in traditional Fenton, H 2 o 2 The problem of low utilization rate and small application range provides a preparation method of polymer heterogeneous Fenton-like catalyst-PVDF catalytic membrane

Method used

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  • Method for preparing polymer heterogeneous Fenton-like catalyst-polyvinylidene fluoride (PVDF) catalytic membrane
  • Method for preparing polymer heterogeneous Fenton-like catalyst-polyvinylidene fluoride (PVDF) catalytic membrane
  • Method for preparing polymer heterogeneous Fenton-like catalyst-polyvinylidene fluoride (PVDF) catalytic membrane

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specific Embodiment approach 1

[0008] Specific embodiment one: The preparation method of the polymer heterogeneous Fenton-like catalyst-PVDF catalytic membrane in this embodiment is carried out in the following steps: 1. Weigh 4 to 20 parts of polyvinylidene fluoride, 50 parts by mass, respectively ~90 parts of solvent and 0.1~10 parts of additives are mixed, then stirred at 45℃~60℃ until completely dissolved, kept at constant temperature for 30min~30h at 30℃~55℃, and then scraped the film on a clean glass plate , then immerse in a coagulation bath (distilled water) for 30min to 24h to obtain a PVDF membrane; 2. Put the PVDF membrane prepared in step 1 into an ethanol solution with a volume concentration of 50% to 75% for pretreatment for 5min to 120min, Then treat it with deionized water for 10min to 120min; 3. Put the PVDF membrane treated in step 2 into an alkali solution with a concentration of tetrabutylammonium bromide of 0.1 to 4mg / mL, and then base it at 0°C to 70°C Treat for 5min to 15min, and wash...

specific Embodiment approach 2

[0009] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that in step 1, 8-15 parts of PVDF, 60-80 parts of solvent and 1-8 parts of additives are weighed and mixed according to the ratio of parts by weight. Other steps and parameters are the same as in the first embodiment.

specific Embodiment approach 3

[0010] Specific embodiment 3: The difference between this embodiment and specific embodiment 1 is that in step 1, 10 parts of PVDF, 70 parts of solvent and 5 parts of additives are weighed and mixed according to the ratio of parts by weight. Other steps and parameters are the same as in the first embodiment.

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Abstract

The invention relates to a method for preparing a polymer heterogeneous Fenton-like catalyst-polyvinylidene fluoride (PVDF) catalytic membrane, in particular to a preparation method of a Fenton-like catalytic membrane. By using the preparation method, the problems that iron ions are difficult to recover, and H2O2 has low utilization rate and small application range are solved. The method comprises the following steps: firstly, mixing PVDF powder, a solvent and an additive, stirring, and keeping stand, and carrying out knifing on a clean glass sheet; secondly, carrying out pretreatment on an ethanol solution, and cleaning with deionized water; thirdly, carrying out alkali treatment, and cleaning with the deionized water until neutrality; fourthly, grafting; fifthly, swelling and sulfonating; and finally, putting a solution containing Fe<3+>, vibrating in a water bath to obtain the PVDF catalytic membrane. In the invention, the catalyst has high oxidation resistance and large specific surface area, and can not only purify difficultly degradable macromolecular dye substances but also effectively catalyze organic pollutants in H2O2 degradable water through using the interception function of the membrane, and the method is simple and convenient to operate; and simultaneously, wastewater comes up to the reuse standard, thereby having significance for the development of environmental sustainability.

Description

technical field [0001] The invention relates to a preparation method of a Fenton-like catalytic membrane. Background technique [0002] Fenton oxidation has many advantages, such as simple method, fast oxidation rate, low reagent concentration, cost-effective, etc., and the reagent is environmentally friendly. However, the optimal pH value is 3.0-4.0. When the pH value is greater than 4, iron will be oxidized with hydroxide. The form of iron is precipitated, which greatly reduces the reaction rate, and most biochemical systems will be inhibited when the pH is less than 5.0, and the pH value is greatly reduced. It is not suitable for the restoration of soil and groundwater. In order to prevent the precipitation of iron when the pH value rises, some strong complexing agents are added to the reaction system to stabilize iron ions. Therefore, an improved (Modified) Fenton with ferrous complexes as catalysts has appeared. System and the Fenton-like system using the complex of fe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/28B01J35/02
Inventor 马军张瑛洁吴培瑛刘增贺
Owner HARBIN INST OF TECH
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