Regenerating method for polyvinylidene fluoride separation membrane carrying thiourea group and used for absorbing silver ions

A polyvinylidene fluoride and polyvinylidene fluoride microsphere technology, applied in separation methods, filtration separation, filter regeneration and other directions, can solve the problems of functional separation membrane precious metal recycling technology research and description and other problems, and achieve easy industrial production and implementation , the effect of stable loading and simple preparation process

Active Publication Date: 2019-07-23
YANSHAN UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Although the relevant literature provides the preparation method and application range of the functional separation membrane, which provides a new way for the recovery of precious metals, it does not research and explain the regeneration of the functional separation membrane and the recovery and utilization of precious metals. From the perspective of engineering application, there are certain defects and limitations

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  • Regenerating method for polyvinylidene fluoride separation membrane carrying thiourea group and used for absorbing silver ions
  • Regenerating method for polyvinylidene fluoride separation membrane carrying thiourea group and used for absorbing silver ions
  • Regenerating method for polyvinylidene fluoride separation membrane carrying thiourea group and used for absorbing silver ions

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preparation example Construction

[0048] The invention provides a preparation method of a polyvinylidene fluoride separation membrane carrying a thiourea group, which is used to absorb silver ions in wastewater. Carbon-carbon double bonds are generated, and then 4-chloromethylstyrene is introduced into the polyvinylidene fluoride molecular chain through a chemical grafting process, and then the thiourea Grafted on the polyvinylidene fluoride skeleton, and finally using phase transfer technology to prepare a polyvinylidene fluoride separation membrane with thiourea groups, the specific steps are:

[0049] S11, alkalization treatment of polyvinylidene fluoride:

[0050] Raw materials with the following mass ratios are used: polyvinylidene fluoride microspheres: tetrabutylammonium bromide: sodium hydroxide: deionized water = 30-45:8.06:40:250;

[0051] Dissolve tetrabutylammonium bromide and sodium hydroxide in deionized water, stir until completely dissolved into a uniform solution, and then heat and stir in a ...

Embodiment 1

[0070] S1. Preparation of polyvinylidene fluoride separation membrane carrying thiourea groups:

[0071] S11, alkalization treatment of polyvinylidene fluoride:

[0072] Take by weighing 8.06g of tetrabutylammonium bromide and 40g sodium hydroxide in a 500mL beaker, then add 250mL of deionized water into the beaker, stir the solution in the beaker to make the added tetrabutylammonium bromide and hydrogen Sodium oxide was dissolved, tetrabutylammonium bromide and sodium hydroxide were dissolved, and the glass rod was used to continue stirring the solution for 3 minutes to make it uniform; after that, the mouth of the beaker was sealed with plastic wrap and placed on a multifunctional magnetic stirrer, and the heating and Stirring control switch, the speed is set to 450r / min, after the temperature of the solution used for alkalization in the beaker rises to 80°C, remove the plastic wrap at the mouth of the beaker, add 40g of polyvinylidene fluoride microspheres into the beaker a...

Embodiment 2

[0125] S1. Preparation of polyvinylidene fluoride separation membrane carrying thiourea groups:

[0126] S11, alkalization treatment of polyvinylidene fluoride:

[0127]Take by weighing 8.06g of tetrabutylammonium bromide and 40g sodium hydroxide in a 500mL beaker, then add 250mL of deionized water into the beaker, stir the solution in the beaker to make the added tetrabutylammonium bromide and hydrogen Sodium oxide was dissolved, tetrabutylammonium bromide and sodium hydroxide were dissolved, and the glass rod was used to continue stirring the solution for 3 minutes to make it uniform; after that, the mouth of the beaker was sealed with plastic wrap and placed on a multifunctional magnetic stirrer, and the heating and Stirring control switch, the speed is set to 450r / min, after the temperature of the solution used for alkalization in the beaker rises to 80°C, remove the plastic wrap at the mouth of the beaker, add 30g of polyvinylidene fluoride microspheres into the beaker an...

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Abstract

The invention provides a regenerating method for a polyvinylidene fluoride separation membrane carrying a thiourea group and used for absorbing silver ions. The regenerating method comprises the following steps: firstly, performing alkalization treatment on a polyvinylidene fluoride microsphere, thereby generating a carbon-carbon double bond in a molecular structure thereof; introducing 4-chloromethyl styrene into a polyvinylidene fluoride molecular chain through a chemical grafting process; utilizing a chemical bonding action between the introduced thiourea group and the thiourea molecule tograft the thiourea group onto a polyvinylidene fluoride skeleton; adopting a phase transfer process for preparing the polyvinylidene fluoride separation membrane carrying the thiourea group. The regenerating method is simple in preparation process and is easy for industrial production; the thiourea group introduced into the separation membrane is stable and is difficult to leach and lose; the prepared separation membrane has excellent absorbing selectivity to the silver ions in effluent; the regenerating eluant of separation membrane is prepared for separating the silver ions from the separation membrane, so as to realize regeneration and recycling of the separation membrane; the invention also provides the method for recycling the silver ions and regenerating the regenerating eluant of separation membrane.

Description

technical field [0001] The invention belongs to the technical field of waste water treatment, and relates to a method for regenerating a polyvinylidene fluoride separation membrane carrying a thiourea group for absorbing silver ions. Background technique [0002] Since the middle of the 20th century, the electroplating industry has developed from general decorative protection to high corrosion resistance, high temperature resistance, and electrical conductivity. Among them, electroplating silver is widely used in the fields of electronics, electricity, automobiles, aviation, aerospace and jewelry. The wastewater containing heavy metals and precious metals generated during the electroplating process has complex components and is not easy to dispose of. If it is discharged directly without treatment, it will not only cause waste of resources, but also pollute the water body, and metal ion pollutants will be transmitted through the food chain and can be absorbed in the organism...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26B01J20/28B01J20/30B01J20/34B01D65/02B01D67/00B01D69/02B01D71/34B01D71/82C02F1/28C02F1/44C02F101/20
CPCB01D65/02B01D67/0011B01D67/0013B01D69/02B01D71/34B01D71/82B01D2321/162B01D2321/168B01D2321/2058B01D2325/12B01J20/265B01J20/28033B01J20/3475C02F1/285C02F1/44C02F2101/20C02F2303/14C02F2303/16
Inventor 宋来洲刘培吕晓龙王秀丽何本桥林立刚田磊李希达
Owner YANSHAN UNIV
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