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Preparation method and application of temperature-sensitive composite hydrogel by utilizing synergistic effect of photocatalysis and temperature sensitivity

A composite hydrogel, synergistic technology, applied in chemical instruments and methods, alkali metal compounds, inorganic chemistry, etc., can solve the problems of catalyst catalytic activity and selectivity reduction, catalyst loss, difficult separation, etc., and achieve high adsorption and degradation. performance, enhance adsorption performance, enhance the effect of mechanical strength

Active Publication Date: 2020-05-15
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, photocatalysts mostly exist in the form of nano-scale or micron-scale powder or flakes, resulting in high specific surface energy and strong agglomeration tendency, which greatly reduces the catalytic activity and selectivity when used as a catalyst, and the reaction ends. It is not easy to separate and lead to the loss of catalyst, causing environmental pollution

Method used

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  • Preparation method and application of temperature-sensitive composite hydrogel by utilizing synergistic effect of photocatalysis and temperature sensitivity
  • Preparation method and application of temperature-sensitive composite hydrogel by utilizing synergistic effect of photocatalysis and temperature sensitivity
  • Preparation method and application of temperature-sensitive composite hydrogel by utilizing synergistic effect of photocatalysis and temperature sensitivity

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preparation example Construction

[0039] Preferably, the preparation method specifically includes the following steps:

[0040] 1) Add temperature-sensitive monomer M1, temperature-sensitive monomer M2, chemical crosslinking agent M3, photocatalyst M4 and alginate M5 into deionized water in sequence to prepare an aqueous solution with a mass concentration of 5-20%. In a sealed container at 25°C, pass inert gas and stir for 30-70 minutes until completely dispersed to form a uniform mixed solution.

[0041] 2) Add an initiator to the mixed solution, inject a stabilizer after 5-15 minutes, and continue to react for 25-35 minutes under the protection of an inert gas until the mixed solution begins to appear gel-like.

[0042] 3) Put the gel-like mixed solution at 20-30°C and seal it for 10-36 hours, then place the reaction product in a divalent cation solution to replace the cations in the alginate; take it out and soak it in After 1-3 days in deionized water, the temperature-sensitive composite hydrogel is obtai...

Embodiment 1

[0053] 1) Add 929 μL (5 mmol) of MEO to the sample bottle 2 MA monomer (molecular formula is Purchased from SigmaAldrich), 2857 μL (10 mmol) of OEGMA 300 (Molecular formula sound Purchased from SigmaAldrich) monomer, 0.2g of sodium alginate was dissolved in 10mL of deionized water to obtain mixed solution A;

[0054] 2) Add 5mg of crosslinker MBAA and 1gg-C to mixed solution A 3 N 4 Photocatalyst, ultrasonically dispersed uniformly to obtain mixed solution B;

[0055] 3) Add 0.02g (0.088mmol) initiator APS and 10μL (0.067mmol) accelerator TEMED to the mixed solution B after bubbling nitrogen for 20min, then inject nitrogen gas for 30min, seal and react for 12h;

[0056] 4) After the reaction, use calcium chloride (CaCl) with a concentration of 5% (w / v) 2 ) solution for 5 hours to form an interpenetrating network structure hydrogel, then soak in deionized water and change the water at regular intervals to remove unreacted monomers and cross-linking agents.

[0057] Cal...

Embodiment 2

[0060] 1) add the NIPAM monomer of 566mg (5mmol) (molecular formula is Purchased from Macklin), 2857 μL (10 mmol) of OEGMA 300 (molecular formula is Purchased from Sigma Aldrich) monomer, 0.1g of calcium alginate was dissolved in 10mL of deionized water to obtain mixed solution A;

[0061] 2) Add 10mg of cross-linking agent MBAA and 0.2g of TiO to mixed solution A 2 Photocatalyst, ultrasonically dispersed uniformly to obtain mixed solution B;

[0062] 3) Add 0.03g (0.132mmol) initiator APS and 15μL (0.1005mmol) accelerator TEMED to the mixed solution B after bubbling nitrogen for 20min, then inject nitrogen gas for 30min, seal, and react for 12h;

[0063] 4) After the reaction, use barium chloride (CaCl) with a concentration of 2% (w / v) 2 ) solution for 5 hours to form an interpenetrating network structure hydrogel, then soak in deionized water and change the water at regular intervals to remove unreacted monomers and cross-linking agents.

[0064] The absorbance of the s...

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Abstract

The invention relates to the technical field of printing and dyeing wastewater treatment. The invention discloses a preparation method and application of temperature-sensitive composite hydrogel by utilizing a synergistic effect of photocatalysis and temperature sensitivity. The temperature-sensitive composite hydrogel disclosed by the invention is prepared by the steps: introducing a temperature-sensitive copolymer and a photocatalyst into alginate hydrogel; the porosity of the hydrogel is adjustable in the temperature change process, a dye can be adsorbed and degraded under the illuminationcondition, and the adsorption capacity of the composite hydrogel to the dye is improved by virtue of the synergistic effect of a porous structure in the hydrogel caused by adding a catalyst and a loose structure formed by a temperature-sensitive copolymer at the temperature higher than the conversion temperature. And by virtue of the photocatalyst embedded in the hydrogel, the degradation of the adsorbed dye and the cyclic utilization of the composite hydrogel can be realized, and the composite hydrogel can be applied to the fields of printing and dyeing sewage treatment and the like.

Description

technical field [0001] The invention relates to the technical field of printing and dyeing wastewater treatment, in particular to a preparation method and application of a temperature-sensitive composite hydrogel that has a good removal function for organic dyes such as methylene blue and malachite green. Background technique [0002] So far, the removal of dyes from printing and dyeing wastewater is still a difficult problem in industry. At present, the treatment methods for organic dye pollution mainly include physical-chemical methods, chemical methods and biological methods. Physical methods often remove large particles of impurities through precipitation, centrifugation, adsorption, filtration (sieving), air flotation, etc., without changing the nature of sewage and impurities. The chemical method is to add some chemical substances to the water body to chemically react with the pollutants in the water, such as generating insoluble salt or decomposing into non-toxic and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/28C08F222/38C08F220/54C08J3/075C08L33/14C08L33/24C08L5/04B01J20/24B01J20/28C02F1/28B01J20/30B01J20/26
CPCC08F220/28C08F220/54C08J3/075B01J20/24B01J20/28047C02F1/286B01J20/261C08J2333/14C08J2333/24C08J2405/04
Inventor 钟齐陈晨胡能林丽
Owner ZHEJIANG SCI-TECH UNIV
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