Preparation method of material for adsorbing lead

A technology of chitosan and citric acid, which is applied in chemical instruments and methods, adsorbed water/sewage treatment, other chemical processes, etc., can solve the problems that limit the large-scale production of chitosan-citric acid, the high reaction cost, the reaction Long cycle and other problems, to achieve the effect of simple preparation method, safe and efficient operation, and short reaction cycle

Active Publication Date: 2018-11-30
北京中农探味科技有限公司
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0005] Chitosan and citric acid are carried out through acylation reaction and make the polymkeric substance of chitosan-citric acid, in the prior art, in the acylation reaction of chitosan and citric acid usually need to add acetone or methyl alcohol etc. Organic reagents are used as reaction solvents, metal catalysts need to be added, and the reaction conditions are high temperature and high pressure, the reaction cycle is long, the reaction cost is high, and the risk factor is large, which limits the large-scale preparation of chitosan-citric acid

Method used

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  • Preparation method of material for adsorbing lead

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Effect test

Embodiment 1

[0034] A kind of preparation method of the material of lead adsorption, this material is chitosan-citric acid polymer, comprises the following steps:

[0035] Step 1. Weigh citric acid, sodium hypophosphite, chitosan and distilled water respectively according to the mass ratio of 36:9:180:2, add citric acid and distilled water into the container and stir them to dissolve, then add hypophosphite Sodium phosphate and chitosan, heated to 60 ° C, stopped after stirring for 4 hours, cooled to room temperature to obtain a reaction mixture;

[0036] Among them, the degree of deacetylation of chitosan is 84.40%, and the weight average molecular mass is 261000;

[0037] Step 2: Add an ethanol aqueous solution with a volume fraction of 85% to the reaction mixture to settle, filter with suction to collect the filter cake, dry the filter cake under vacuum conditions at 60°C for 36 hours, grind and pulverize through a 100-mesh sieve to obtain The chitosan-citric acid polymer. The weight ...

Embodiment 2

[0039] A kind of preparation method of the material of lead adsorption, this material is chitosan-citric acid polymer, comprises the following steps:

[0040] Step 1. Weigh citric acid, sodium hypophosphite, chitosan and distilled water respectively according to the mass ratio of 2:2:40:1, add the citric acid and distilled water into the container and stir them fully to dissolve them, then add hypophosphite Sodium phosphate and chitosan, heated to 150 ° C, stopped after stirring for 5 hours, cooled to room temperature to obtain a reaction mixture;

[0041] Among them, the degree of deacetylation of chitosan is 84.40%, and the weight average molecular mass is 261000;

[0042] Step 2: Add an ethanol aqueous solution with an ethanol volume fraction of 85% to the reaction mixture for sedimentation, filter with suction, collect the filter cake, dry the filter cake under vacuum at 60°C for 36 hours, grind and pulverize through a 120-mesh sieve to obtain The chitosan-citric acid pol...

Embodiment 3

[0044] A kind of preparation method of the material of lead adsorption, this material is chitosan-citric acid polymer, comprises the following steps:

[0045] Step 1. Weigh citric acid, sodium hypophosphite, chitosan and distilled water respectively according to the mass ratio of 18:7.2:144:1, add citric acid and distilled water into the container and stir to dissolve them, then add hypophosphite Sodium phosphate and chitosan, heated to 105 ° C, stopped after stirring for 4.5 hours, cooled to room temperature to obtain a reaction mixture;

[0046] Among them, the degree of deacetylation of chitosan is 84.40%, and the weight average molecular mass is 261000;

[0047] Step 2: Add an ethanol aqueous solution with a volume fraction of 85% to the reaction mixture to settle, filter with suction, collect the filter cake, dry the filter cake under vacuum at 60°C for 36 hours, grind and pulverize through a 110-mesh sieve to obtain The chitosan-citric acid polymer. The weight average ...

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Abstract

The invention discloses a method for preparing a lead adsorption material. The material is a chitosan-citric acid polymer. The method includes the following steps that firstly, citric acid is weighed and added into a container containing distilled water, hypophosphite and chitosan are added during stirring, the mixture is heated to 60-150 DEG C, stirring reaction stops 4-5 h later, and a reaction mixed solution is obtained; secondly, an ethyl alcohol aqueous solution with the volume fraction of ethyl alcohol being 85% is added into the reaction mixed solution for sedimentation and suction filtration, a filter cake is collected and placed in a vacuum condition at 60 DEG C to be dried for 36 h, the filter cake is ground and smashed and passes a 100-120-mesh sieve to obtain the chitosan-citric acid polymer. The preparation method is simple, the reaction period is short, hypophosphite is selected to serve as the catalyst, distilled water serves as a reaction solvent, toxin and harmful chemical reagents and metal catalysts are not used, pollution is not caused, operation is easy, safety and high efficiency are achieved, lead ion adsorption in water is high, and application value is important.

Description

technical field [0001] The invention relates to a preparation method of a lead-absorbing material. More specifically, the present invention relates to a preparation method of a chitosan-citric acid polymer material. Background technique [0002] Water is the material basis for human survival. It is widely used in animal and plant growth, industrial production and people's life. It is an important factor for the sustainable development of human society. In recent years, although the acceleration of the industrialization process has brought economic and social development, it has also brought serious environmental pollution problems, especially heavy metal pollution in water bodies. Heavy metal pollution in water mainly refers to the water pollution caused by the waste water containing heavy metal pollutants produced by industrialization directly and wantonly discharged into rivers, lakes and surface waters without proper treatment. Common heavy metals mainly include lead, c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/24B01J20/28B01J20/30C02F1/28C02F1/62
CPCB01J20/24B01J20/28016B01J2220/4812C02F1/285C02F2101/20
Inventor 哈益明崔文慧靳婧郭芹李庆鹏邓诏轩
Owner 北京中农探味科技有限公司
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