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One-step preparation method of double network gel and double network gel and its application
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A dual network, gel technology, applied in chemical instruments and methods, other chemical processes, physical/chemical process catalysts, etc., can solve the problems of insufficient green environmental protection, complex and time-consuming preparation process, etc.
Active Publication Date: 2021-06-08
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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However, most of the research on double network gels is aimed at synthetic polymer gels rather than natural polymer gels. Most of the preparation requires the use of toxic organic cross-linking reagents, and neither the preparation process nor the final product is environmentally friendly.
In addition, traditional double network gels require a two-step cross-linking process, which is complex and time-consuming to prepare.
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Embodiment 1
[0029] Embodiment 1, one-step green preparation double network gel
[0030] Follow the steps below to prepare double network gels:
[0032] (2) Add the mixed solution obtained in step (1) dropwise to 100 mL, 200 mg / L of CaCl 2 solution, double network gel balls were obtained.
[0033] The preparation process of this embodiment and the prepared double network gel spheres are as follows: figure 1 The scanning electron microscope image of the gel is shown in figure 2 As shown, the visible gel has a porous structure. The gel adsorbed tetracycline with an initial concentration of 100 mg / L in water for 8 hours at 25 °C, pH 7, and an adsorbent dosage of 1 mg / mL. The remaining concentration was 1.7 mg / L, and the removal rate was as high as 98.3%.
Embodiment 2
[0034] Embodiment 2, one-step green preparation double network gel
[0035] Follow the steps below to prepare double network gels:
[0036] (1) Take a beaker, add 2 g of sodium alginate and 2 g of carboxymethyl cellulose to 100 mL of water, and stir to form a uniform solution.
[0037] (2) Put the mixed solution obtained in step (1) into a circular mold, soak it in 100mL, 200mg / L FeCl 3 solution for 30 minutes to obtain a double network gel block.
[0038] The mold used in this embodiment and the prepared circular double network gel block are as follows: image 3 shown. The gel can remove tetracycline with an initial concentration of 100mg / L in water at 25°C, pH 7, catalyst dosage 1mg / mL, and hydrogenperoxide dosage 0.25μL / mL under the conditions of heterogeneous Fenton degradation for 2 hours. The removal rate is as high as 100%. .
Embodiment 3
[0039] Embodiment 3, one-step green preparation double network gel
[0040] Follow the steps below to prepare double network gels:
[0041] (1) Take a beaker, add 10 g of sodium alginate and 10 g of carboxymethyl cellulose to 100 mL of water, stir to form a uniform solution, and obtain a mixed solution.
[0042] (2) Add the mixed solution obtained in step (1) dropwise into 100mL, 200mg / L of CuCl 2 solution, double network gel balls were obtained. The gel has a removal rate of 96.5% for tetracycline with an initial concentration of 100 mg / L in water at 25°C, pH 7, and an adsorbent dosage of 1 mg / mL for 8 hours. mL, hydrogenperoxide dosage 0.25μL / mL under the conditions of catalytic 2h removal rate of 99.3%.
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Abstract
The invention discloses a method for preparing a double network gel in one step, the double network gel and its application. The method includes the following steps: using metal ions as a cross-linking agent, two components in a composite system composed of sodium alginate and carboxymethyl cellulose simultaneously form a gel to obtain the double network gel. The sodium alginate and carboxymethyl cellulose required for the preparation of the present invention have wide sources, are cheap and easy to obtain, and have good biocompatibility. Forming other specified shapes has broad practical application prospects. The present invention utilizes the intersection of sodium alginate and carboxymethyl cellulose cross-linking mode to obtain a double network gel in one step, so that the two networks support each other to enhance the stability of the gel and increase the porosity, thereby improving the adsorption performance of the gel , and the introduction of specific metal ions can make the gel have catalytic properties, which has great application potential in environmental pollution control.
Description
technical field [0001] The invention relates to a method for preparing double-network gel in one step, double-network gel and application thereof, and belongs to the research field of environmental functional materials. Background technique [0002] The double-network hydrogel is composed of two hydrogel systems that are independent and interpenetrating with each other. Due to its superior adsorption performance, mechanical properties and stability compared with the traditional single-system gel, it has been compared. Pay attention. However, most of the research on double network gels is aimed at synthetic polymer gels rather than natural polymer gels. Most of the preparations require the use of toxic organic cross-linking reagents, and neither the preparation process nor the final product is environmentally friendly. In addition, traditional double network gels require a two-step cross-linking process, which is complex and time-consuming to prepare. Contents of the inven...
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Application Information
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