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Composite hollow fibrous membrane capable of adsorbing heavy metal ions and preparation method of composite hollow fibrous membrane

A technology for adsorbing heavy metals and fiber membranes, applied in chemical instruments and methods, adsorption water/sewage treatment, membrane technology, etc. Effects of Water Flux and Hydrophilic Improvement

Inactive Publication Date: 2014-01-08
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

[0028] (1) Pretreatment of attapulgite. Weigh 10g of attapulgite with a particle size of 300 mesh, wash it 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 the sieve with the corresponding mesh according to the particle size after grinding. Purified attapulgite was obtained.

[0029]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. Wash with ...

Embodiment 2

[0035] (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.

[0036] Prepare a hydrochloric acid solution with a concentration of 0.5mol / L, take 20g 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. Wash with distilled water un...

Embodiment 3

[0042] (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.

[0043] 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 composite hollow fibrous membrane good in adsorbing of heavy metal ions such as nickel and mercury ions, large in adsorption quantity, high in adsorbing efficiency and reusable after being cleaned, and a preparation method of the composite hollow fibrous membrane. The composite hollow fibrous membrane is prepared by subjecting attapulgite to washing and pickling, utilizing tannic acid for modifying the attapulgite, compositing the modified attapulgite with polyvinylidene fluoride and adopting a dry-wet spinning process. The composite hollow fibrous membrane has good adsorbing effect on the metal ions such as cadmium, nickel and mercury ions in wastewater, and the composite membrane with a mass ratio between the polyvinylidene fluoride and the attapulgite of 1:0.01 is approximately 40% in nickel ion adsorbing rate and approximately 60% in mercury ion adsorption rate. The composite hollow fibrous membrane is good in pressure resistance and free of supports, a membrane component can be made into any sizes and shapes, loading density in the film membrane is large, membrane area and flux per unit membrane are large. In addition, the composite hollow fibrous membrane is simple in preparation process, low in cost, easy for industrial implementation and stable in physical properties.

Description

technical field [0001] The invention relates to the field of intelligent polymer materials, in particular to a composite flat hollow fiber 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 ter...

Claims

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Application Information

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IPC IPC(8): B01D71/34B01D69/12B01D69/08B01D67/00C02F1/44C02F1/28C02F1/62
Inventor 赵义平韩永良张桂芳刘兴甜吕超
Owner TIANJIN CNCLEAR ENVIRONMENTAL PROTECTION SCI & TECH CO LTD
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