Alginate-based composite hydrogel catalytic membrane of renewable catalyst and preparation method thereof

A technology for hydrogel catalytic membranes and regenerated catalysts, applied in chemical instruments and methods, physical/chemical process catalysts, organic compounds/hydrides/coordination complex catalysts, etc., can solve the problem of difficult collection of photocatalyst powder and loss of strength , polymers are easy to degrade and other problems, to achieve the effect of good application prospects, low cost, and simple preparation process

Inactive Publication Date: 2013-12-25
YINGKOU KELIN MEMBRANE TECH ENG SERVICE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Aiming at the deficiencies of the prior art, the technical problems to be solved by the present invention are that photocatalyst powder is difficult to collect, the photocatalyst coating on the inorganic carrier is easy to fall off, the compatibility of the polymer-loaded catalyst is poor and the polymer is easy to degrade and lose strength, and the catalyst is difficult to recycle and regenerate, etc. question

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1. the preparation of the ferric alginate-based composite hydrogel catalytic membrane of a kind of renewable catalyst and the method for recycling catalyst

[0023] a) Weigh 1 g of sodium alginate, TiO with a mass percentage of 5% of sodium alginate 2 , poured into 100ml of deionized water together, stirred to dissolve, ultrasonically dispersed evenly, placed in an airtight container at 4 °C and left to stand for defoaming to obtain a casting liquid;

[0024] b) Preparation of FeCl with a metal ion mass percentage of 0.1% 3 Aqueous solution, as ionic crosslinking agent;

[0025] c) Pour the casting liquid obtained in step a) onto a dry and clean glass sheet, scrape out a uniform film with a thickness of 100 μm with a film scraper, vacuum debubble, and soak together with the glass sheet into the ion exchange obtained in step b). In the joint agent solution, the reaction was carried out for 4h to obtain the iron alginate-based composite hydrogel catalytic membr...

Embodiment 2

[0028] Embodiment 2. the preparation of the zinc alginate-based composite hydrogel catalytic membrane of a regenerable catalyst and the method for recovering the catalyst

[0029] a) Weigh 5g of sodium alginate and zinc oxide with a mass percentage of 5% of sodium alginate, pour them into 100ml of deionized water, stir to dissolve, ultrasonically disperse evenly, and place them in an airtight container at 30°C for defoaming. casting liquid;

[0030] b) preparing an aqueous solution of zinc chloride salt with a metal ion mass percentage of 10% as an ionic crosslinking agent;

[0031] c) Pour the casting liquid obtained in step a) onto a dry and clean glass sheet, scrape out a uniform film with a thickness of 1000 μm with a film scraper, vacuum debubble, and soak it together with the glass sheet into the ion exchange obtained in step b). In the joint agent solution, the reaction was carried out for 24h to obtain the zinc alginate-based composite hydrogel catalytic membrane;

...

Embodiment 3

[0034] Embodiment 3. the preparation of the barium alginate-based composite hydrogel catalytic membrane of a kind of renewable catalyst and the method for recycling catalyst

[0035] a) Weigh 2g of sodium alginate and 10% tin oxide of sodium alginate by mass, pour them into 100ml of deionized water together, stir to dissolve, ultrasonically disperse evenly, and place them in an airtight container at 5°C for defoaming. casting liquid;

[0036] b) preparing a barium chloride aqueous solution with a metal ion mass percentage of 2% as an ionic crosslinking agent;

[0037] c) Pour the casting solution obtained in step a) onto a dry and clean glass sheet, scrape out a uniform film with a thickness of 300 μm with a film scraper, vacuum debubble, and soak together with the glass sheet into the ion exchange obtained in step b). In the joint agent solution, the reaction was carried out for 12h to obtain a barium alginate-based composite hydrogel catalytic membrane;

[0038] d) placing...

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Abstract

The invention discloses an alginate-based composite hydrogel catalytic membrane of a renewable catalyst and a preparation method thereof. According to the invention, a photo-catalyst / alginate composite membrane is prepared by mixing a photo-catalyst and sodium alginate fully to prepare a membrane casting solution, scraping the membrane on a glass plate by using a membrane scrapping rod and performing metal ion cross-linking. By selecting the type of the photo-catalyst, the content and the particle diameter of the photo-catalyst are changed, so that a catalytic degradation of toxic and harmful organic matters of the membrane is adjusted. The reusability of the membrane is greatly improved by applying the characteristics that an ion cross-linking agent in the alginate hydrogel is not degraded during radiating, and although the macromolecules of the alginate are degraded, a hydrogel with a similar strength of the hydrogel before degrading can be formed. The preparation method of the composite hydrogel catalytic membrane is simple and low in cost; the preparation process is free of pollution, green and environmental-friendly; the composite hydrogel catalytic membrane is immersed by a strong metal ion complexing agent; the expensive photo-catalyst can be recycled through simple precipitation separation.

Description

technical field [0001] The invention relates to an alginate-based composite hydrogel catalytic membrane with a regenerable catalyst and a preparation method thereof, belonging to the fields of environmental functional materials and catalysis. Background technique [0002] The application of photocatalytic degradation to the treatment of industrial wastewater and drinking water has become the focus of related research [Journal of Membrane Science, 2012, 392-393: 192-203]. Among many semiconductor materials used in photocatalytic degradation, TiO 2 It is considered as the most suitable photocatalyst due to its excellent properties such as high activity, high chemical stability, photostability, non-toxicity and low price [Journal of Hazardous Materials, 2011, 185: 77-85]. [0003] In traditional wastewater treatment processes, TiO 2 Nanoparticles are usually utilized in the form of suspended systems due to the large surface area of ​​the particles. However, suspended TiO in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J35/06B01J31/38B01J31/26B01J31/40C02F1/30
Inventor 赵孔银冯灵智林贝贝陈甜傅轶凡李志辉
Owner YINGKOU KELIN MEMBRANE TECH ENG SERVICE
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