Preparation method and application of amido equipped composite hydrogel loaded with nano-cadmium sulfide photocatalyst

A composite hydrogel, photocatalyst technology, applied in physical/chemical process catalysts, organic compound/hydride/coordination complex catalysts, chemical instruments and methods, etc. The problems of high glue purity and complex synthesis route can achieve the effect of good pore structure, large specific surface area and good mechanical strength.

Active Publication Date: 2017-03-15
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The existing artificially synthesized polymer hydrogel has one or more functional groups such as amino, hydroxyl, and carboxyl groups, which have a certain effect on the adsorption and removal of organic pollutants in water, but the existing artificial synthesis methods need to add triggers. Hydrogels can only be synthesized by using reagents and cross-linking agents, and most of the synthesis routes are complicated, and the obtained polymers will also contain the previously added cross-linking agents and initiators, resulting in low purity of the hydrogel, and high-energy radiation polymerization does not need to be added Other substances, only contain the monomers required for the synthesis of hydrogels, making the hydrogels of high purity

Method used

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  • Preparation method and application of amido equipped composite hydrogel loaded with nano-cadmium sulfide photocatalyst
  • Preparation method and application of amido equipped composite hydrogel loaded with nano-cadmium sulfide photocatalyst
  • Preparation method and application of amido equipped composite hydrogel loaded with nano-cadmium sulfide photocatalyst

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Experimental program
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Effect test

Embodiment 1

[0044] 1. Weigh a certain mass of N-methylolacrylamide monomer and dissolve it in deionized water as component A, then add a certain amount of 2-hydroxyethyl acrylate to the above solution as component B, distilled water as component Divide into C, mix according to (A+B):C is 1:4 (V / V), where A:B is 1:5 (mol / mol); ultrasonic 30min to mix the solution evenly, fill the mixed solution with N 2 to ensure anaerobic conditions.

[0045] 2. Radiation polymerization process: by directly adding refrigerant, at -78°C, using 60 Co-γ high-energy rays, the radiation dose is controlled to 1×10 5 Gy.

[0046] 3. In-situ loading of nano-cadmium sulfide: Weigh 0.5g of dry gel into a 100ml Erlenmeyer flask, add 50ml of 0.2mol / L CdCl 2 solution, placed in a constant temperature shaker for 24h and filtered out the hydrogel, dried at room temperature, and then placed in 50ml of 0.2mol / L Na 2 Shake in S solution for 24h. The formation of CdS was indicated when the color of the hydrogel changed...

Embodiment 2

[0049] (A+B): C is 1:4 (V / V), monomer solution ratio: A: B is 1:5 (mol / mol);

[0050] Radiation polymerization process: at a temperature of -78°C, using 60 Co-γ high-energy rays, the radiation dose is controlled to 1×10 5 Gy;

[0051] CdCl used 2 The concentration of the solution is 0.2mol / L, the Na used 2 The concentration of S solution is 0.2mol / L;

[0052] The nano-cadmium sulfide composite hydrogel used was irradiated with 100W xenon lamp when treating bisphenol A;

[0053] 0.1g of nano-cadmium sulfide-loaded composite hydrogel was placed in 40ml of 50mg / L bisphenol A solution for 24h adsorption and photocatalytic degradation reaction. The removal capacity of the composite hydrogel to bisphenol A is 15.11 mg / g, and the removal rate reaches 80%. Due to the loading of nano-cadmium sulfide, the mechanical strength of the hydrogel is greatly enhanced, the service life is long, and the adsorption is also enhanced.

Embodiment 3

[0055] (A+B): C is 1:4 (V / V), monomer solution ratio: A: B is 1:5 (mol / mol);

[0056] Radiation polymerization process: at a temperature of -78°C, using 60 Co-γ high-energy rays, the radiation dose is controlled to 1×10 5 Gy;

[0057] CdCl used 2 The concentration of the solution is 0.2mol / L, the Na used 2 The concentration of S solution is 0.2mol / L;

[0058] The nano cadmium sulfide composite hydrogel used was irradiated with 500W xenon lamp when treating bisphenol A;

[0059] 0.1g of nano-cadmium sulfide-loaded composite hydrogel was placed in 40ml of 50mg / L bisphenol A solution for 24h adsorption and photocatalytic degradation reaction. The removal capacity of the composite hydrogel to bisphenol A is 18.51 mg / g, and the removal rate reaches 95%. Due to the loading of nano-cadmium sulfide, the mechanical strength of the hydrogel is greatly enhanced, the service life is long, and the adsorption is also enhanced.

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Abstract

The invention relates to a preparation method and application of an amido equipped composite hydrogel loaded with a nano-cadmium sulfide photocatalyst. The method includes: firstly mixing 2-hydroxyethyl acrylate, N-hydroxymethyl acrylamide and distilled water evenly, and taking the polymer hydrogel as the template to conduct in situ precipitation loading of a nano-cadmium sulfide photocatalyst; synthesis of the nano composite hydrogel employs hydrogel to adsorb a cadmium salt solution so as to conduct in situ precipitation; the synthesized hydrogel is utilized to adsorb cadmium ions, and then the cadmium ions adsorbed to the hydrogel are precipitated by a Na2S solution to form the nano-cadmium sulfide photocatalyst. The cadmium salt is any one of cadmium nitrate and cadmium chloride. The prepared amido equipped composite hydrogel loaded with the nano-cadmium sulfide photocatalyst can be applied to absorption and degradation of organic matter bisphenol A in water, can effectively remove the organic matter bisphenol A, and the nano composite hydrogel has high mechanical strength and long service life.

Description

technical field [0001] The invention relates to a preparation method of a composite hydrogel having an amide group and supporting a nanometer cadmium sulfide photocatalyst and its application in water treatment. Background technique [0002] Endocrine disruptor bisphenol A is an exogenous compound or mixture that can change the function of the biological endocrine system. Due to its extensive application in industry, agriculture and daily life, this type of compound is widely distributed in the environment, so it is also known as "Environmental endocrine disruptors". As a large country that produces and consumes various industrial and agricultural supplies, China is also one of the areas with serious endocrine disruptor pollution. A large number of endocrine disruptors have been detected in the water source of our country. Because endocrine disruptors can negatively affect the organism as a whole, future generations and populations, the harm of endocrine disruptors to the e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/26C02F1/30C02F101/34
CPCB01J31/26B01J35/004C02F1/30C02F2101/34C02F2305/10
Inventor 李正魁朱鸿杰杨建华丁帮璟张一品王浩覃云斌陈湜胡优优
Owner NANJING UNIV
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