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Heavy metal ion adsorption type polyvinylidene fluoride (PVDF) hollow fiber membrane

A technology of heavy metal ions and fiber membranes, applied in alkali metal compounds, alkali metal oxides/hydroxides, membrane technology, etc., to achieve good spinning performance, easy industrial implementation, and high packing density

Active Publication Date: 2012-07-04
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In view of the shortcomings of existing PVDF separation membranes in the application of heavy metal ion adsorption, the technical problem to be solved by the present invention is to provide a hybrid hollow fiber separation membrane with adsorption function for heavy metal ions such as lead, cadmium, nickel, molybdenum, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1: The PVDF-attapulgite hybrid hollow fiber separation membrane with adsorption function for heavy metal ions contains modified attapulgite, and the mass ratio of the PVDF to the modified attapulgite is 1: 0.01; by the following method preparation:

[0027] (1) Preparation of spinning solution. Weigh PVDF and add it to a beaker filled with 500 mL of DMF, and the mass percentage of PVDF in DMF is 18%. A porogen PEG with a molecular weight of 10000 was added, and the amount of PEG added was 8% by mass in DMF. The beaker was placed in a water bath at 60°C, and the solid was dissolved under electromagnetic stirring to obtain a casting film feed solution. A certain amount of modified attapulgite is added to the feed liquid, so that the mass ratio of PVDF to attapulgite is 1:0.01, fully stirred and ultrasonically oscillated to disperse evenly to obtain a spinning solution.

[0028] (2) Preparation of PVDF-attapulgite hybrid hollow fiber membrane. Pour the spinn...

Embodiment 2

[0032] Embodiment 2: basically the same as Example 1

[0033] (1) Preparation of spinning solution. Weigh PVDF and add it to a beaker filled with 500 mL of DMF, and the mass percentage of PVDF in DMF is 16%. A porogen PEG with a molecular weight of 10000 was added, and the amount of PEG added was 8% by mass in DMF. The beaker was placed in a water bath at 60°C, and the solid was dissolved under electromagnetic stirring to obtain a casting film feed solution. A certain amount of modified attapulgite is added to the feed liquid, so that the mass ratio of PVDF to attapulgite is 1:0.05, fully stirred and ultrasonically oscillated to disperse uniformly to obtain a casting solution.

[0034] (2) Preparation of PVDF-attapulgite hybrid hollow fiber membrane. Pour the spinning stock liquid into the still of the dry-wet spinning machine, seal the spinning machine pot, heat the spinning machine pot so that the temperature of the spinning stock liquid is at 30° C., and perform vacuum d...

Embodiment 3

[0039] (1) Preparation of spinning solution. Weigh PVDF and add it to a beaker filled with 500 mL of DMF, and the mass percentage of PVDF in DMF is 17%. A porogen PEG with a molecular weight of 10000 is added, and the amount of PEG added is 10% by mass in DMF. The beaker was placed in a water bath at 60°C, and the solid was dissolved under electromagnetic stirring to obtain a casting film feed solution. A certain amount of modified attapulgite is added to the feed liquid, so that the mass ratio of PVDF to attapulgite is 1:0.05, fully stirred and ultrasonically oscillated to disperse uniformly to obtain a casting solution.

[0040] (2) Preparation of PVDF-attapulgite hybrid hollow fiber membrane. Pour the spinning stock liquid into the still of the dry-wet spinning machine, seal the spinning machine pot, heat the spinning machine pot so that the temperature of the spinning stock liquid is at 40° C., and perform vacuum degassing treatment for 30 minutes. After the degassing t...

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Abstract

The invention discloses a heavy metal ion adsorption type polyvinylidene fluoride (PVDF) hollow fiber membrane. The invention belongs to the technical field of membranes and in particular relates to a preparation technology for an organic-inorganic hybrid hollow fiber membrane. The heavy metal ion adsorption type PVDF hollow fiber membrane comprises modified attapulgite, wherein the mass ratio of the PVDF to the modified attapulgite is (1:0.01)-(1:0.1). The heavy metal ion adsorption type PVDF hollow fiber membrane has the advantages that high pressure resistance is achieved, a supporting body is not required, a membrane component has any sizes and shapes and large filling density, and unit volume membrane area and flux are large. In addition, the hybrid membrane is high in spinning performance, the spinning membrane-forming process is simple in process, and cost is low.

Description

technical field [0001] The invention belongs to the technical field of membranes, and in particular relates to a preparation technology of an organic-inorganic hybrid hollow fiber membrane. Specifically, it is a hollow fiber ultrafiltration membrane with adsorption function for heavy metal ions prepared by composite hybridization of polyvinylidene fluoride membrane material and attapulgite. Background technique [0002] With the rapid development of the chemical industry and metallurgical industry, the pollution of wastewater containing heavy metal ions such as lead, copper, chromium, mercury, etc. from electrolytes, electroplating solutions, and mining and metal smelting processes is becoming more and more serious. The pollution of heavy metal wastewater has become It has become a serious environmental and social problem, and it is a key problem in economic development, environmental health, and drinking water safety that urgently need to be solved. [0003] In recent year...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/34B01D67/00B01D69/08B01J20/28B01J20/26
Inventor 赵义平张桂芳李培欣陈莉申向张强
Owner TIANJIN POLYTECHNIC UNIV
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