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Photothermal-photochemical synergistic conversion hydrogel material as well as preparation method and application thereof

A hydrogel and photochemical technology, applied in the field of photothermal-photochemical synergistic conversion of hydrogel materials and their preparation, can solve the problems of limited absorption, slow photocharge transfer, and limited feasibility of photochemical conversion, and achieve a simple preparation process. , Wide application prospects, highlighting the effect of photodegradation efficiency

Active Publication Date: 2021-06-29
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the feasibility of photochemical conversion applications is severely limited due to the limited absorption of ultraviolet-visible light and the slow transfer of photocharges.

Method used

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  • Photothermal-photochemical synergistic conversion hydrogel material as well as preparation method and application thereof
  • Photothermal-photochemical synergistic conversion hydrogel material as well as preparation method and application thereof
  • Photothermal-photochemical synergistic conversion hydrogel material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A method for preparing a photothermal-photochemical synergistically converted hydrogel, comprising the following steps:

[0031] (1) Weigh 10g of polyvinyl alcohol (PVA), pour it into a beaker, add 90mL of hot deionized water, heat in a water bath at 100°C, stir at high speed until completely dissolved, and obtain a 10wt% polyvinyl alcohol solution;

[0032] (2) Add 2 mL of acetic acid to 98 mL of deionized water to form an acetic acid solution; weigh 5 g of chitosan (CS), pour it into a beaker, add 95 mL of acetic acid solution, stir at high speed to dissolve it, and obtain 5 wt % chitosan sugar solution.

[0033] (3) 4g polyvinyl alcohol solution is mixed with 1.4g chitosan solution to form a precursor solution;

[0034] (4) Slowly drop glutaraldehyde (195 μL, 4wt%) and HCl (400 μL, 0.1wt%) into the above precursor solution in sequence, mix and stir to generate a gel reaction, and the sample is completely gelled within 6 hours; The obtained gel was repeatedly soaked...

Embodiment 2

[0038] A method for preparing a photothermal-photochemical synergistically converted hydrogel, comprising the following steps:

[0039] (1) Weigh 0.5gTi 3 AlC 2 (MAX) powder, soak it in NH 4 In a mixed solution of F (2.96g) and HCl (20mL), heat to 60°C in a water bath and stir at a low speed for 48h; after the reaction, centrifuge at a speed of 3000rpm and wash with deionized water, repeating several times until the pH of the upper layer solution is 6; Ultrasound, take the supernatant, and freeze-dry for 12 hours to obtain MXene nanosheets;

[0040] (2) Weigh 0.220g of MXene nanosheets, 1.083g of lanthanum nitrate hexahydrate, 0.532g of strontium nitrate hexahydrate, 1.455g of cobalt nitrate hexahydrate and 3.92g of KOH, pour them into a three-neck round bottom flask, add 80mL to Ionized water, ultrasonically stirred for 2h; then, the mixed solution was transferred to a hydrothermal reaction kettle (100mL), and placed in an oven at 180°C for solvothermal reaction for 48h; s...

Embodiment 3

[0051] A method for preparing a photothermal-photochemical synergistically converted hydrogel, comprising the following steps:

[0052] (1) Weigh 0.5gTi 3 AlC 2 (MAX) powder, soak it in NH 4 In a mixed solution of F (2.96g) and HCl (20mL), heat to 60°C in a water bath and stir at a low speed for 48h; after the reaction, centrifuge at a speed of 3000rpm and wash with deionized water, repeating several times until the pH of the upper layer solution is 6; Ultrasound, take the supernatant, and freeze-dry for 12 hours to obtain MXene nanosheets;

[0053] (2) Weigh 0.110g of MXene nanosheets, 1.083g of lanthanum nitrate hexahydrate, 0.532g of strontium nitrate hexahydrate, 1.455g of cobalt nitrate hexahydrate and 3.92g of KOH, pour them into a three-neck round bottom flask, add 80mL to Ionized water, ultrasonically stirred for 2h; then, the mixed solution was transferred to a hydrothermal reaction kettle (100mL), and placed in an oven at 180°C for solvothermal reaction for 48h; s...

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Abstract

The invention discloses a photothermal-photochemical synergistic conversion hydrogel material as well as a preparation method and application thereof, and belongs to the technical field of photothermal and photochemical conversion. A photothermal photocatalyst is combined with an interpenetrating polymer of chitosan and polyvinyl alcohol, and the hydrogel material with the photothermal and photocatalytic degradation synergistic effect is prepared; and the photothermal photocatalyst is MXene, La0.5Sr0.5CoO3 or La0.5Sr0.5CoO3-MXene. In the hydrogel, the photocatalyst can absorb short-wave photons in a solar spectrum to generate photon-generated carriers so as to generate a photocatalytic degradation reaction, the photothermal material can convert long-wave photons in the solar spectrum into heat energy so as to efficiently evaporate water, accelerate photochemical reaction kinetics and promote photocatalytic degradation, and high-efficiency water production is realized. The hydrogel material is simple in preparation process and has wide application prospects in the fields of sewage treatment, seawater desalination and the like.

Description

technical field [0001] The invention belongs to the technical field of photothermal and photochemical conversion, and in particular relates to a photothermal-photochemical synergistic conversion hydrogel material and its preparation method and application. Background technique [0002] In recent years, solar energy has become a renewable energy source with great development potential due to its abundant resources, sustainability, and natural pollution-free. At present, fresh water resources are increasingly scarce in the world, and the use of solar energy to drive seawater desalination technology has attracted widespread attention. Therefore, it is very important to explore efficient solar conversion technologies and materials for the utilization of solar energy. The ways of solar energy conversion mainly include photochemical conversion and photothermal conversion. Photochemical conversion generates photogenerated carriers by capturing solar energy, which can migrate and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/22C02F1/04C02F1/14C02F1/30C02F103/08C02F101/38C02F101/20C02F101/10
CPCB01J27/22C02F1/14C02F1/048C02F1/30C02F2305/10C02F2101/38C02F2103/08C02F2101/20C02F2101/10B01J35/23Y02A20/212Y02A20/124Y02A20/142Y02W10/37
Inventor 陆依范德琪张昊丁明烨杨小飞
Owner NANJING FORESTRY UNIV
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