Preparation method and application of chitosan haze settling agent

A technology of chitosan and sedimentation agent, which is applied in the field of preparation of chitosan haze sedimentation agent, can solve the problem that electricity consumption is not a small number, difficult problems, etc., achieve good adsorption and aggregation performance, wide sources, and accelerate aggregation and sedimentation. effect of speed

Active Publication Date: 2014-07-30
NANJING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, major cities are seriously short of water, and their power consumption is not a small amount, which has caused problems for the already tense urban power supply system.

Method used

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  • Preparation method and application of chitosan haze settling agent

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The chitosan that deacetylation degree is 90% is dissolved in 0.05% acetic acid aqueous solution in mass percent concentration, and the weight-average molecular weight of chitosan is 850,000g / mol, then adds ethylene glycol, and in the chitosan mixed solution, The mass percentage of the diol is 5%, and it is prepared into an aqueous solution containing chitosan with a mass percentage concentration of 0.1%, which is fully dissolved to prepare the chitosan smog settler. Then burn mosquito coils in the laboratory-made smog environment simulation box to simulate atmospheric smog, and the concentration of mosquito coils in the smog environment simulation box after combustion and gasification is 500 μg / m 3 , Spray 100mL of atomized chitosan sedimentation agent directly into the simulation box, and the time for clearing the haze is 50min.

[0025] The present invention specifically adopts chitosan as the atmospheric smog settlement agent, and chitosan is one of the most excelle...

Embodiment 2

[0033] The difference between embodiment 2 and embodiment 1 is: the chitosan that the degree of deacetylation is 60% is dissolved in the 1% acetic acid aqueous solution of mass percentage concentration, and the weight-average molecular weight of chitosan is 1,000,000g / mol, then add Sodium dodecyl sulfonate, the mass percentage of sodium dodecyl sulfonate in the chitosan mixed solution is 3%, and it is prepared into an aqueous solution containing chitosan with a mass percentage concentration of 1%, fully dissolved, and prepared Chitosan haze reducer. Then burn mosquito coils in the laboratory-made haze environment simulation box to simulate atmospheric haze, and the concentration of mosquito coils in the haze environment simulation box after combustion and gasification is 200 μg / m 3 , Spray 50mL of atomized chitosan sedimentation agent directly into the simulation box, and the time for clearing the haze is 55min. The test results are listed in Table 1.

Embodiment 3

[0035] The difference between embodiment 3 and embodiment 1 is: the chitosan that the degree of deacetylation is 99% is dissolved in the mass percent concentration and is 0.01% in the acetic acid aqueous solution, and the weight-average molecular weight of chitosan is 10,000g / mol, then add Sodium stearate, the mass percentage of sodium stearate in the chitosan mixed solution is 1%, is mixed with the aqueous solution that the mass percentage concentration containing chitosan is 0.05%, fully dissolves, and prepares the chitosan haze settlement agent. Then burn mosquito coils in the laboratory-made smog environment simulation box to simulate atmospheric smog, and the concentration of mosquito coils in the smog environment simulation box after combustion and gasification is 700 μg / m 3 , Spray 150mL of atomized chitosan sedimentation agent directly into the simulation box, and the time for clearing the haze is 60min. The test results are listed in Table 1.

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Abstract

The invention discloses a preparation method of a chitosan haze settling agent. The preparation method comprises the following steps: (1) dissolving chitosan with weight-average molecular weight of 10000-1000000g / mol and degree of deacetylation of 60-99% in an acid solution with mass percentage concentration of 0.01-1%; mixing the materials uniformly, wherein the mass percentage concentration of chitosan in the acid solution is 0.05-1%; (2) adding a small molecule modifier accounting for 1-20% of the chitosan mixed solution by mass, and fully dissolving the small molecule modifier, thus preparing the chitosan haze settling agent. The invention also discloses an application of the chitosan haze settling agent to atmospheric haze pollution. Chitosan is a biodegradable environment-friendly material and has the characteristics of low toxicity, low cost, energy consumption reduction and no secondary pollution. The new application of the chitosan haze settling agent is explored, and a new application field for atmospheric haze pollution is opened up.

Description

technical field [0001] The invention relates to the field of air pollution treatment, in particular to a preparation method and application of a chitosan haze sinking agent. Background technique [0002] Air pollution, especially smog weather, has become a killer of the biosphere. Smog is a weather phenomenon that occurs when PM2.5 and other size particles, dust, aerosols and other particles in the floating atmosphere are relatively stable under certain weather conditions such as humidity and temperature. Smog disaster is the result of long-term air pollution. Specifically, smog is a mixture of fog and haze. The core substance of haze is smoke, dust and other substances suspended in the air. The relative humidity of the air is lower than 80%, and the color is yellow. [0003] The gas can directly enter and adhere to the lower respiratory tract and lung lobes of the human body, which is harmful to human health. The formation of haze weather is mainly caused by man-made env...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B37/08B01D51/02
Inventor 杨琥李海江蔡涛严涵李爱民
Owner NANJING UNIV
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