Carbon nitride nanosheet (CNNS) composite pH-sensitive hydrogel with Pizza structure as well as preparation method and application of CNNS composite pH-sensitive hydrogel

A technology of composite hydrogel and sheet carbon nitride, which is applied in chemical instruments and methods, organic compound/hydride/coordination complex catalysts, water pollutants, etc. Small area and other problems, to achieve the effect of convenient recycling and solve recycling problems

Active Publication Date: 2020-02-21
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the photocatalyst inside the composite aggregate hydrogel bound with photocatalyst is difficult to function, and the polymer has the disadvantage of too small contact area in water.

Method used

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  • Carbon nitride nanosheet (CNNS) composite pH-sensitive hydrogel with Pizza structure as well as preparation method and application of CNNS composite pH-sensitive hydrogel
  • Carbon nitride nanosheet (CNNS) composite pH-sensitive hydrogel with Pizza structure as well as preparation method and application of CNNS composite pH-sensitive hydrogel
  • Carbon nitride nanosheet (CNNS) composite pH-sensitive hydrogel with Pizza structure as well as preparation method and application of CNNS composite pH-sensitive hydrogel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1: Prepare 8wt% acrylic acid solution with distilled water, take 20ml of the solution and place it in a quartz bottle, then seal it and fill it with nitrogen for 40 minutes; place the quartz bottle filled with nitrogen under a UV lamp with a central wavelength of 365nm and a power of 300w, keeping a distance of 18cm , and irradiate for 100min, the polyacrylic acid film can be obtained; pour out the prepared PAA and solution from the quartz bottle, wash and dry the PAA, intercept 0.08g PAA and place it in the bottom of a beaker with a certain specification, add 2ml of distilled water dropwise, and let it stand for 60min; take 15mg- 30mg CNNS was placed in 5ml distilled water, ultrasonically oscillated for 30min, then introduced into the above-mentioned beaker, and left to stand for 10 hours; then suck out the distilled water that had been clarified on the upper layer, and place it in a thermostat at 50°C for 12 hours to confirm the weight and ratio;

[0027] CNNS / ...

Embodiment 2

[0029] Embodiment 2: synthesis process such as figure 1 As shown, compared with Example 1, the experimental parameters only changed the irradiation time under the simulated solar xenon lamp to 50 minutes, and finally a PAM / CNNS / PAA composite pH-sensitive hydrogel with a mass ratio of 6:3:8 could be obtained.

[0030] Combining Examples 1 and 2, it can be known that the mass ratio of PAM / CNNS / PAA can be controlled by changing the reaction time of light under the xenon lamp; (Mass ratio 2:3:8) The swelling ratio is decreasing, and the decrease is small, but its maximum tensile strength is greatly increased to 57.3KPa, which is nearly 6 times the maximum tensile strength of PAA, which is PAM / CNNS / PAA (mass ratio 2:3:8) 1.1 times the maximum tensile strength; 0.17g PAM / CNNS / PAA (mass ratio 6:3:8) at wavelengths above 420nm, optical power density 100 mWcm -2The cycle experiment diagram of the degradation of 30ml (10mg / L) RhB solution under the xenon lamp irradiation of simulated s...

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Abstract

The invention relates carbon nitride nanosheet (CNNS) composite pH-sensitive hydrogel with a Pizza structure as well as a preparation method and application of the CNNS composite pH-sensitive hydrogel. Acrylic acid solution is irradiated by ultraviolet under a certain condition to be directly polymerized into a polyacrylic acid (PAA) film, a certain mass of CNNS is deposed on the PAA film as a substrate, then, CNNS / PAA and an acrylamide solution are irradiated by an xenon lamp under filtering by a 420 nm optical filter, and the CNNS can initiate the acrylamide to be polymerized on the CNNS / PAAto produce Pizza CNNS composite hydrogel with an interpenetrating network structure. The prepared PAM / CNNS / PAA with the interpenetrating network structure is found to have substantially improved tensile strength as compared with PAA, besides, the film form structure of the PAM / CNNS / PAA composite hydrogel is different agglomeration hydrogel structures of common organic polymeric materials and photocatalytic materials, the adsorption function of PAM and the photodegradation function of the CNNS and PAA can cooperate in printing and dyeing wastewater treatment, and meanwhile, the problem of difficulty in recovering multiple photocatalysts.

Description

technical field [0001] The invention relates to the fields of macromolecules, photocatalysis and organic sewage treatment, is an interdisciplinary subject applied to the direction of waste water treatment, and particularly relates to a nanosheet carbon nitride composite pH-sensitive hydrogel, its preparation method and application. Background technique [0002] In recent years, people have paid more and more attention to the direction of energy-saving and environment-friendly solar energy utilization. Photocatalysis has been considered as one of the most promising technologies in terms of solar energy conversion and pollutant removal. Carbonitrides (CN) have attracted great attention in the search for excellent and stable visible-light-induced photocatalysts. However, CN catalysts need to be blown to make them evenly distributed in the sewage during use, which brings problems similar to the secondary sedimentation tank in industrial wastewater treatment. It usually takes tw...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J31/06C02F1/28C02F1/30C02F101/30
CPCB01J27/24B01J31/06C02F1/285C02F1/30C02F2101/30B01J35/39
Inventor 葛家国刘境廷牛何晶英陈捷焦正马梦迪
Owner SHANGHAI UNIV
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