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Photo-crosslinking hydrogel as well as preparation method and application thereof

A hydrogel and photocrosslinking technology, which is applied in chemical instruments and methods, water pollutants, and other chemical processes, can solve problems such as low gel strength, uneven dispersion of fillers, and slow curing of polymer gels. , to achieve the effect of improving mechanical properties and high adsorption capacity

Active Publication Date: 2021-01-15
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In view of the problems existing in the prior art, the object of the present invention is to provide a photocrosslinked hydrogel and its preparation method and application, specifically a photocrosslinked PVA-SbQ / MOF / PAM interpenetrating network hydrogel and its preparation method and application, to solve the problems of uneven dispersion of fillers in polymers, slow polymer gel curing speed, and low gel strength in the prior art

Method used

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  • Photo-crosslinking hydrogel as well as preparation method and application thereof
  • Photo-crosslinking hydrogel as well as preparation method and application thereof
  • Photo-crosslinking hydrogel as well as preparation method and application thereof

Examples

Experimental program
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Embodiment 1

[0035] (1) Preparation of PVA-SbQ / MOF suspension: ZIF-8 (MOF can be one of IRMOF series, ZIF series, MIL series, UiO series, PCN series, etc.) is dispersed in 10% PVA- In the SbQ aqueous solution, the mass ratio of ZIF-8 and PVA-SbQ is 1:10, and the ultrasonic dispersion is uniform, and the PVA-SbQ / MOF suspension is configured;

[0036] (2) Preparation of photocrosslinked PVA-SbQ / MOF composite hydrogel: PVA-SbQ / MOF mixed dispersion liquid was poured into a circular polytetrafluoroethylene mold with a diameter of 25mm and a thickness of 3mm, and a 100W / cm 2 UV lamp, irradiated with ultraviolet light for 5 minutes, the SbQ group undergoes dimerization and crosslinking, forming the first network, and obtaining photocrosslinking PVA-SbQ / ZIF-8 composite hydrogel;

[0037] (3) Preparation of photocrosslinked PVA-SbQ / MOF / PAM interpenetrating network hydrogel: soak the obtained PVA-SbQ / ZIF-8 composite hydrogel in a solution containing acrylamide (AM), methylenebisacrylamide ( MBAA) a...

Embodiment 2

[0039] In step (2), adopt 100W / cm 2 A UV lamp was irradiated under UV light for 10 min to obtain a photocrosslinked PVA-SbQ / ZIF-8 composite hydrogel. All the other processes are the same as in Example 1.

Embodiment 3

[0041] In step (2), adopt 100W / cm 2 A UV lamp was irradiated under UV light for 15 min to obtain a photocrosslinked PVA-SbQ / ZIF-8 composite hydrogel. All the other processes are the same as in Example 1.

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Abstract

The invention discloses photo-crosslinking hydrogel as well as a preparation method and application thereof, and particularly relates to photo-crosslinked polyvinyl alcohol styryl pyridinium condensate (PVA-SbQ) / metal organic framework (MOF) / polyacrylamide composite hydrogel as well as a preparation method thereof, wherein the hydrogel is applied to dye adsorption. The preparation method comprisesthe following steps: step 1, dispersing MOF in a PVASbQ aqueous solution or generating MOF in situ in the PVASbQ aqueous solution by using an MOF precursor, and preparing photo-crosslinked PVASbQ / MOFcomposite hydrogel by adopting a photo-crosslinking technology to form a first network; and step 2, soaking the PVASbQ / MOF composite hydrogel into an aqueous solution containing a monomer AM, a cross-linking agent MBAA and a photoinitiator, and after adsorption saturation, initiating polymerization again under ultraviolet irradiation to form a cross-linked and interpenetrating second network structure. The polymer / MOF composite hydrogel with the interpenetrating network structure is prepared by adopting a photopolymerization means, is environmentally friendly and efficient, effectively overcomes inorganic particle sedimentation in a polymer / inorganic filler compounding process, and realizes uniform dispersion of MOF in a polymer network.

Description

technical field [0001] The invention belongs to the technical field of dye wastewater treatment, and in particular relates to a photocrosslinked hydrogel and its preparation method and application, in particular to a preparation technology of an interpenetrating network hydrogel. Background technique [0002] Dye wastewater is one of the main pollution sources of water bodies. The treatment of dye wastewater is mostly by physical adsorption method, biological method, chemical oxidation method, flocculation and membrane separation. Among them, as an important physical and chemical method, the adsorption method does not introduce new pollutants, can enrich and separate organic pollutants from wastewater, and realize waste recycling. It has the characteristics of good adsorption effect, simple operation, and wide application range. It has been widely used in the actual work of dye wastewater pollution control. Adsorption is the preferred method for the treatment of dye wastewa...

Claims

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Application Information

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IPC IPC(8): C08J3/075C08J3/24C08J3/28C08L29/04C08L87/00C08L33/26C08F220/56C08F222/38C08F2/48B01J20/26B01J20/28C02F1/28B01J20/30C02F101/30
CPCC08J3/075C08J3/246C08J3/28C08F220/56C08F2/48B01J20/261B01J20/226B01J20/28047C02F1/285C08J2329/04C08J2487/00C08J2333/26C08J2433/26C08J2429/04C02F2101/308C08F222/385
Inventor 桑欣欣倪才华石刚王大伟夏晓峰
Owner JIANGNAN UNIV