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Functionalized polyvinyl alcohol hydrogel and preparation method thereof

A polyvinyl alcohol, functionalized technology, applied in chemical instruments and methods, inorganic chemistry, water pollutants, etc., can solve problems such as limiting industrial application and subsequent treatment of adsorbents, achieving good regeneration and reusability, and beneficial to the environment. The effect of sustainable development and simple preparation process

Active Publication Date: 2014-05-07
广州慈康生物科技有限公司
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Problems solved by technology

Although there are many research reports, there are no examples of using natural adsorbents to treat heavy metal industrial wastewater, mainly because there are still difficulties in the subsequent treatment of adsorbents after adsorbing heavy metals, which limits their industrial applications.

Method used

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  • Functionalized polyvinyl alcohol hydrogel and preparation method thereof

Examples

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preparation example Construction

[0035] The preparation method of functionalized polyvinyl alcohol:

[0036] 1. Maleinized Polyvinyl Alcohol

[0037] (1) Add 20 mL of maleic anhydride / dimethyl sulfoxide solution with a concentration of 5% to 10% dropwise into 100 mL of 5% to 10% polyvinyl alcohol dimethyl sulfoxide solution, and let stand for 0.5 to 2 hours.

[0038] (2) Put the above solution under an 8W low-pressure mercury lamp to irradiate (light intensity 10w / m 2 ) 0.5-6h, after drying, maleic anhydrided polyvinyl alcohol is obtained.

[0039] 2. Amino Acid Functionalized Polyvinyl Alcohol

[0040] (1) Add 250mL of NaOH solution with a concentration of 0.4mol / L to a 500mL three-necked flask, swell 3g of polyvinyl alcohol for 6 hours, add 30mL of epichlorohydrin, mix well, stir and react at 60°C for 1 to 10 hours, cool and pump Filter, wash with ethanol and water, and dry to obtain epoxidized polyvinyl alcohol particles.

[0041] (2) After fully swelling 0.5g of epoxidized polyvinyl alcohol particl...

example 1

[0049] Weigh 2g Mercapto-functionalized polyvinyl alcohol , 0.26g of sodium alginate (Qingdao Xiangyu Seaweed Co., Ltd.) and 95mL of deionized water were added to a three-necked flask, heated in a boiling water bath, mechanically stirred for 2 hours to make it completely mixed, and the mixture was heated in a water bath at 80°C. Add 2 g of chitosan (Hangzhou Fuli Biotechnology Co., Ltd.) and mechanically stir for 6 h (the weight ratio of polyvinyl alcohol and chitosan is 50:50). Drop the above-prepared mixed solution into 3% calcium chloride-boric acid saturated solution with a syringe to prepare composite hydrogel beads with a particle size of 2 to 3 mm, soak for 24 hours, and finally rinse with deionized water for 3 times and soak in water .

[0050] After testing, the hydrogel was tested for Cu 2+ The adsorption capacity is listed in Table 1.

Embodiment 2

[0055] Under the same other conditions of Example 1, the weight ratio of thiol-functionalized polyvinyl alcohol and chitosan was changed to 70:30 to prepare a hydrogel.

[0056] After testing, the hydrogel was tested against Pb 2+ The adsorption capacity is listed in Table 1.

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Abstract

The invention provides novel functionalized polyvinyl alcohol hydrogel capable of adsorbing heavy metal ions and a preparation method of the novel functionalized polyvinyl alcohol hydrogel. The hydrogel comprises functionalized polyvinyl alcohol (PVA), chitosan (CS) and sodium alginate, wherein the weight ratio of the functionalized polyvinyl alcohol to the chitosan ranges from (5:95) to (95:5). The prepared hydrogel has the large adsorption capacity on heavy metal and is high in adsorption speed. The hydrogel is prepared by the following steps: functionalizing the polyvinyl alcohol and completely mixing the functionalized polyvinyl alcohol and the sodium alginate to be dissolved in water; then adding a certain amount of the chitosan and uniformly mixing; and finally, dripping mixed liquid into a calcium chloride-boric acid saturated solution to prepare hydrogel globules. The composite hydrogel provided by the invention is simple in preparation process, strong in operability and stable in performance, can be circularly utilized, has no secondary pollution and is widely applied to the field of heavy metal sewage treatment.

Description

technical field [0001] The invention discloses a functionalized polyvinyl alcohol hydrogel and a preparation method thereof, more specifically a functionalized polyvinyl alcohol hydrogel capable of absorbing heavy metal ions and a preparation method thereof. Background technique [0002] my country's industrial wastewater, especially heavy metal wastewater, has a huge amount of discharge. A large amount of heavy metals in the water can not only cause cancer, teratogenicity, and mutagenesis to the human body, but also cause chronic poisoning to the human body. Heavy metals are difficult to degrade, not easy to be metabolized in the environment, and easy to be enriched and amplified by organisms. Once polluted water bodies are difficult to remove through self-purification, they not only pollute the water environment, but also greatly damage the ecosystem. [0003] Heavy metal ions in wastewater can be recycled by precipitation, adsorption, ion exchange, membrane separation and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26B01J20/28B01J20/30C02F1/28C02F101/20
Inventor 东为富李鲁中陈明清马丕明段芳施冬健汪洋李开武
Owner 广州慈康生物科技有限公司
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