Natural colloid compounded hydrogel and preparation method and application thereof

A natural colloid and hydrogel technology, applied in general water supply conservation, chemical instruments and methods, seawater treatment, etc., can solve the problems of raw material toxicity, high steam evaporation rate, complicated preparation of evaporation devices, etc., and achieve excellent water molecule permeability. , Wide light absorption range, high water retention effect

Active Publication Date: 2020-09-08
NANKAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems of complex preparation of solar energy interface evaporation devices, high toxicity of raw materials and low steam evapor

Method used

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  • Natural colloid compounded hydrogel and preparation method and application thereof
  • Natural colloid compounded hydrogel and preparation method and application thereof
  • Natural colloid compounded hydrogel and preparation method and application thereof

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preparation example Construction

[0036] The invention protects a method for preparing a hydrogel compounded with natural colloids, comprising the following steps:

[0037] Step 1): Take polyvinyl alcohol and concentrated extracted nanocolloids in seawater according to the mass ratio of 10-30:1, add water, and stir at 70-75°C to obtain the initial dispersed liquid;

[0038] Step 2): Add MoS prepared by hydrothermal synthesis to the initial dispersion liquid 2 For nanoflowers, the solid-liquid ratio is 1:1mg / ml, continue stirring at 70-75°C to obtain a uniform black dispersion;

[0039] Step 3): continue to add hydrochloric acid to the black dispersion liquid, stir, stand still at room temperature, and then put it into an oven to allow the reaction to reach equilibrium;

[0040] Step 4): After standing still, put the jelly in the refrigerator to freeze overnight, take it out and thaw it to room temperature, then put it in the refrigerator to freeze, repeat the freezing cycle several times, soak it in deionized...

Embodiment 1

[0042] First, use the repeated freeze-thaw method to synthesize a high-efficiency solar seawater desalination hydrogel compounded by natural colloids. Put 3g polyvinyl alcohol, 300mg seawater concentrated extract colloid and a stirrer into a beaker, add 20mL deionized water, and heat at 70~75℃ Under stirring for 2h, the initial dispersion liquid was obtained. MoS prepared by hydrothermal synthesis was added to the initial dispersion liquid 2 For nanoflowers, the solid-liquid ratio is 1:1mg / ml, continue stirring at 70-75°C for 1 hour to obtain a uniform black dispersion. Continue to add 0.5mL hydrochloric acid to the dispersion, stir for 1-2min, let stand at room temperature for 30min, and then put it in an oven at 60°C for 4h to allow the reaction to reach equilibrium. After standing still, put the jelly in a -80°C refrigerator to freeze overnight, take it out and add deionized water to thaw for 2 hours to room temperature, then put it in a -80°C refrigerator to freeze for 2 ...

Embodiment 2

[0046] First, use the repeated freeze-thaw method to synthesize a high-efficiency solar seawater desalination hydrogel compounded by natural colloids. Put 3g of polyvinyl alcohol, 100mg of concentrated seawater extract colloid and a stirrer into a beaker, add 20mL of deionized water, and heat at 70~75℃ Under stirring for 2h, the initial dispersion liquid was obtained. MoS prepared by hydrothermal synthesis was added to the initial dispersion liquid 2 For nanoflowers, the solid-liquid ratio is 1:1mg / ml, continue stirring at 70-75°C for 1 hour to obtain a uniform black dispersion. Continue to add 0.5mL hydrochloric acid to the dispersion, stir for 1-2min, let stand at room temperature for 30min, and then put it in an oven at 60°C for 4h to allow the reaction to reach equilibrium. After standing still, put the jelly in a -80°C refrigerator to freeze overnight, take it out and add deionized water to thaw for 2 hours to room temperature, then put it in a -80°C refrigerator to free...

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Abstract

The invention relates to natural colloid compounded hydrogel and a preparation method and application thereof. The preparation method comprises the following steps: firstly, taking polyvinyl alcohol and nano colloid concentrated and extracted from seawater, adding water, stirring at 70-75 DEG C to obtain a dispersion initial solution, then adding MoS2 nanoflowers prepared by a hydrothermal synthesis method according to a solid-liquid ratio of 1: 1mg/ml, continuously stirring at 70-75 DEG C to obtain a uniform black dispersion liquid, adding hydrochloric acid, stirring, standing at room temperature, standing in a drying oven for 4 hours, so that the reaction is balanced, finally, freezing the jelly after standing in a refrigerator overnight, taking out the frozen jelly, unfreezing the frozen jelly to normal temperature, freezing the frozen jelly in the refrigerator, repeatedly freezing the frozen jelly for several times, soaking the frozen jelly in deionized water, and washing the frozen jelly to obtain a black opaque gel substance. According to the invention, the hydrogel prepared by graft polymerization by taking polyvinyl alcohol/natural nano colloid/MoS2 as a main raw material is obtained for the first time, and the hydrogel is used as a solar absorber for solar seawater desalination, so that an efficient seawater desalination yield can be obtained.

Description

technical field [0001] The invention relates to the field of environmental materials, in particular to a hydrogel compounded with natural colloids and a preparation method and application thereof. Background technique [0002] With the increasing water pollution and energy-saving demand for water purification, the efficient use of solar energy as the sole energy source for clean water generation from seawater and industrial wastewater, developed in recent years, is a promising approach to address water scarcity. Recent developments in the innovative plasma-photothermal film distillation technology hold great promise for seawater desalination with high thermal efficiency and relatively low energy input. During membrane distillation, water purification is driven by the vapor pressure gradient of a floating porous hydrophobic membrane. The heat positioning system efficiently transfers solar energy to nearby water to generate steam while reducing heat loss to the air and bulk w...

Claims

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Application Information

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IPC IPC(8): C08L29/04C08L101/00C08K11/00C08J3/075C08J9/00C02F1/14C02F1/44C02F103/08
CPCC08J3/075C08J9/00C02F1/14C02F1/447C08J2329/04C08J2400/00C08K2003/3009C08K11/00C02F2103/08Y02A20/142Y02A20/131Y02A20/124Y02A20/212
Inventor 周启星张蕾胡献刚
Owner NANKAI UNIV
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