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Preparation method for chitosan modified algae removal flocculant

A chitosan modification and flocculant technology, applied in chemical instruments and methods, flocculation/sedimentation water/sewage treatment, polluted waterway/lake/pond/river treatment, etc., can solve the problem of low chitosan charge density. , limited widespread use, poor bridging ability, etc., to achieve the effect of improving cation strength, improving solubility, and improving flocculation performance

Inactive Publication Date: 2018-07-24
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Because chitosan has the disadvantages of low charge density, low molecular weight, and poor bridging ability, and at the same time, chitosan can only be dissolved in acidic aqueous solution, which limits its wide use.

Method used

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  • Preparation method for chitosan modified algae removal flocculant

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Embodiment 1

[0034] The preparation method of the present embodiment chitosan modified algae-removing flocculant comprises the steps:

[0035] In the first step, 7.64 g (0.047 mol) of chitosan powder was added to 10 mL of acetic acid solution with a mass concentration of 1%, and placed on a magnetic stirrer to stir until dissolved, and then slowly added 10 mL of maleic anhydride aqueous solution, of which Toric anhydride is 4.589g (0.047mol), stirred with a magnetic stirrer until the solution is uniform and transparent, and a slightly yellow solution. The obtained homogeneous and transparent solution was placed in a water-bath shaker, shaken at 30° C. for 7 hours, and dried at 40° C., and the obtained product was maleylated chitosan.

[0036] In the second step, add 2g of maleylated chitosan, 30ml of deionized water, 6g of acrylamide (AM), and 2g of dimethyldiallyl ammonium chloride (DMDAAC) to the quartz reactor, and stir well To completely dissolve to form a homogeneous aqueous solution...

Embodiment 2

[0040] The preparation method of the present embodiment chitosan modified algae-removing flocculant comprises the steps:

[0041] In the first step, add 9.821g (0.061mo) of chitosan powder to 15mL of acetic acid solution with a mass concentration of 4%, and place it on a magnetic stirrer to stir until dissolved, then slowly add 20mL of maleic anhydride aqueous solution, of which The amount of toic anhydride is 5.892g (0.059mol). Stir with a magnetic stirrer until the solution is uniform and transparent, and a slightly yellow solution. The obtained homogeneous and transparent solution was placed in a water-bath shaker, shaken at 40° C. for 5 hours, and dried at 40° C., and the obtained product was maleylated chitosan.

[0042]In the second step, 3 g of maleylated chitosan monomer, 25 ml of deionized water, 5 g of acrylamide (AM), and 2 g of dimethyl diallyl ammonium chloride (DMDAAC) were sequentially added to the quartz reactor. Stir evenly to completely dissolve and form a h...

Embodiment 3

[0046] The preparation method of the present embodiment chitosan modified algae-removing flocculant comprises the steps:

[0047] The first step is to add 7.64g of chitosan powder to 25mL of acetic acid solution with a mass concentration of 2%, and place on a magnetic stirrer to stir until dissolved, then slowly add 40mL of maleic anhydride aqueous solution, wherein maleic anhydride is 4.589 g, stir with a magnetic stirrer until the solution is uniform and transparent, and a slightly yellow solution. The obtained homogeneous and transparent solution was placed in a water-bath shaker, shaken at 30° C. for 7 hours, and dried at 40° C., and the obtained product was maleylated chitosan.

[0048] In the second step, add 2 g of maleylated chitosan monomer, 25 ml of deionized water, 6 g of acrylamide (AM), and 2 g of dimethyl diallyl ammonium chloride (DMDAAC) to the quartz reactor. Stir evenly to completely dissolve and form a homogeneous aqueous solution, wherein deionized water i...

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Abstract

The invention discloses a preparation method for chitosan modified algae removal flocculant. The preparation method comprises the following steps: preparing N-malely chitosan, mixing with acrylamide monomer and dimethyl diallyl ammonium chloride, dissolving in water, adding a photoinitiator into a mixed solution under protection of nitrogen gas, triggering polymerization reaction through ultraviolet irradiation, and standing and curing to obtain the algae removal flocculant. The chitosan modified algae removal flocculant prepared by the preparation method improves flocculation performance of chitosan, further improves dissolving performance of chitosan, is higher in viscosity coefficient, and can be widely used for algae removal treatment of algae-containing landscape water, river water and lake water. The method is simple to operate, is short in synthesis time; and the used main raw materials are natural high-molecular products from the source, and the preparation method is an economical preparation method for obtaining high-quality algae removal flocculant.

Description

technical field [0001] The invention belongs to the field of environmental protection, and in particular relates to a preparation method of a chitosan-modified algae-removing flocculant. Background technique [0002] At present, the water environment has been seriously polluted, and frequent outbreaks of cyanobacteria blooms and red tides in some areas will not only cause a sharp drop in DO and water quality corruption, but also cause serious threats to human health due to the release of microcystins from the death or rupture of algal cells. Therefore, controlling and removing algae in water bodies is of great significance to the improvement of water environment and drinking water safety. [0003] Chitosan is a natural polymer. Its precursor chitin widely exists in crustaceans such as shrimps and crabs, insects and algae. It is the second largest natural polymer compound after cellulose in the world. Chitosan is an alkaline polysaccharide composed of glucosamine and N-acety...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F251/00C08F220/56C08F226/02C08F2/48C08B37/08C02F1/56C02F101/20C02F101/10
CPCC02F1/5227C02F1/56C08B37/003C08F2/48C08F251/00C02F2103/007C02F2101/20C02F2101/10C02F2303/02C02F2303/04C08F220/56C08F226/02
Inventor 章黎敏孙永军朱四琛朱辉汤佳伟刘鉴雯陈傲文印煜涛时凯迪刘迪唐林辉崔叶萌徐洋张义威林洋姜瑜朱政稳
Owner NANJING UNIV OF TECH
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