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Preparation method of composite flat membrane for adsorbing heavy metal ions and product thereof

A technology for adsorbing heavy metals and flat membranes, which is applied in the fields of alkali metal compounds, chemical instruments and methods, and adsorption water/sewage treatment. It can solve the problems of large adsorption capacity and high adsorption efficiency, and achieve stable physical properties of the membrane. The effect of easy industrial implementation

Inactive Publication Date: 2014-01-01
TIANJIN CNCLEAR ENVIRONMENTAL PROTECTION SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In view of the shortcomings of the existing PVDF-attapulgite hybrid separation membrane in the application of heavy metal ion adsorption, the technical problem to be solved by the present invention is to provide a new modification method for attapulgite, and the attapulgite modified by this method It has good adsorption capacity for heavy metal ions such as mercury, copper, lead, cadmium, nickel, molybdenum, large adsorption capacity and high adsorption efficiency

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Pretreatment of attapulgite. Weigh 10g of attapulgite with a particle size of 300 mesh, wash with 1L of distilled water, take its supernatant after precipitation, centrifuge at 500rpm for 1min, take its supernatant, add a small amount of distilled water to the supernatant and mix evenly, and then continue to centrifuge at 500rpm for 1min. Then take its supernatant, wash the supernatant repeatedly like this for 3 times, and finally carry out centrifugation with 4000rpm, take its precipitate, vacuum dry at 90°C for 24 hours, and select a sieve with the corresponding mesh size according to the particle size after grinding to sieve. Purified attapulgite was obtained.

[0025] Prepare a hydrochloric acid solution with a concentration of 0.5mol / L, add 10g of purified attapulgite and 150mL of hydrochloric acid solution into a small beaker and stir and mix. After 5min, heat the mixture to 70°C, stir for 1h, then oscillate ultrasonically for 30min, and filter with suction. ...

Embodiment 2

[0030] (1) Pretreatment of attapulgite. Weigh 10g of attapulgite with a particle size of 1000 mesh, wash it with 1L of distilled water, and take its supernatant after sedimentation, centrifuge at 500rpm for 1min, take its supernatant, add a small amount of distilled water to the supernatant and mix evenly, continue to centrifuge at 500rpm for 1min, and then take The supernatant, after repeated washing of the supernatant for 3 times in this way, is finally centrifuged at 4000rpm, and the precipitate is collected, dried in vacuum at 90°C for 24 hours, ground and sieved with a sieve corresponding to the particle size to obtain purified Attapulgite.

[0031] Prepare a hydrochloric acid solution with a concentration of 0.5mol / L, add 20g of purified attapulgite and 150mL of hydrochloric acid solution into a small beaker and stir to mix. After 5min, heat the mixture to 70°C, stir for 1h, then oscillate ultrasonically for 30min, and filter with suction. Wash with distilled water unti...

Embodiment 3

[0036] (1) Pretreatment of attapulgite. Weigh 20g of attapulgite with a particle size of 300 mesh, wash it with 1L of distilled water, settle and take its supernatant, centrifuge at 500rpm for 1min, take its supernatant, add a small amount of distilled water to the supernatant and mix evenly, continue to centrifuge at 500rpm for 1min, and then take The supernatant, after repeated washing of the supernatant 5 times in this way, was finally centrifuged at 4000rpm, and the precipitate was taken, dried in vacuum at 90°C for 24 hours, ground and sieved with a sieve corresponding to the particle size to obtain purified Attapulgite.

[0037] Prepare a hydrochloric acid solution with a concentration of 3mol / L, take 10g of purified attapulgite and 150mL of hydrochloric acid solution into a small beaker and stir and mix. After 5min, heat the mixture to 80°C, stir for 2h, then oscillate ultrasonically for 30min, and filter with suction. Wash with distilled water until the pH is about 6,...

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Abstract

The invention relates to a preparation method of a composite flat separation membrane and a product thereof, wherein the composite flat separation membrane has good adsorption ability on heavy metal ions such as nickel, molybdenum, mercury and the like as well as large adsorption capacity and high adsorption efficiency and can be cleaned for recycling. The product provided by the invention is prepared from water-washed and acid-washed attapulgite by modifying attapulgite with tannic acid and compounding with polyvinylidene fluoride. The composite flat membrane provided by the invention has a good adsorption effect on the heavy metal ions such as lead, cadmium, nickel, molybdenum and the like in wastewater, the adsorption rate on nickel ions of the composite membrane in which the mass ratio of polyvinylidene fluoride to modified attapulgite is 1:0.01 is close to 40%, and the adsorption rate on mercury ions is close to 60%. The product provided by the invention integrates the advantages of a polyvinylidene fluoride separation membrane as well as the adsorption performance of attapulgite; the preparation technology is simple and low in cost, does not need special equipment and is easy to implement industrially; the membrane has stable physical performance, and the pure water flux is increased.

Description

technical field [0001] The invention relates to the field of intelligent polymer materials, in particular to a composite flat separation membrane with good adsorption function for heavy metal ions such as mercury, copper, nickel, chromium and lead and a preparation method thereof. The composite membrane has a large adsorption capacity and high adsorption efficiency for heavy metal ions such as nickel, chromium, and lead in water, and can be applied to sewage treatment fields such as electroplating industry and chemical industry, and can be used repeatedly after cleaning. Background technique [0002] In recent years, the pollution of wastewater containing heavy metal ions such as lead, copper, cadmium, chromium, and mercury is becoming more and more serious. Heavy metal wastewater pollution has become a serious environmental and social problem. It is an urgent need to solve economic development, environmental health, and drinking water safety. key problem. [0003] In terms...

Claims

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Application Information

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IPC IPC(8): B01J20/26B01J20/28B01J20/30C02F1/28B01D67/00B01D69/06B01D69/12C02F101/20
Inventor 韩永良赵义平张桂芳刘兴甜吕超
Owner TIANJIN CNCLEAR ENVIRONMENTAL PROTECTION SCI & TECH CO LTD
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