Preparation method and application of adsorption and degradation material

A technology for adsorbing degradation and degrading liquid, applied in chemical instruments and methods, adsorbed water/sewage treatment, other chemical processes, etc., can solve problems such as secondary environmental pollution, and achieve the effects of environmental friendliness, wide source of raw materials, and easy promotion.

Pending Publication Date: 2020-06-16
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the degradation methods / materials of rhodamine B are heat-activated persulfate, transition metal-activated persulfate degradation, etc. These two forms are accompanied by problems such as energy loss and secondary pollution of the environment.

Method used

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  • Preparation method and application of adsorption and degradation material
  • Preparation method and application of adsorption and degradation material
  • Preparation method and application of adsorption and degradation material

Examples

Experimental program
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preparation example Construction

[0036] The preparation method of a kind of adsorption degradation material provided by the present invention and the preparation method of application thereof, specifically comprise the following steps:

[0037] Step a, adding glacial acetic acid into the chitosan solution, stirring constantly during the adding process, and obtaining a uniform and stable hydrogel after standing for a period of time. Wherein, the concentration of the chitosan solution is 2.5g / L-40g / L, and the ratio of glacial acetic acid to chitosan is 0.4ml / g-1.6ml / g. During the addition of glacial acetic acid, constant stirring is required to ensure that chitosan and glacial acetic acid react completely. After the addition, it must be allowed to stand long enough to age until the formed hydrogel is uniform and stable, at least one hour is required.

[0038] In step b, the static hydrogel is slowly dropped into liquid nitrogen for rapid freezing to obtain a frozen product. Among them, the static hydrogel is ...

Embodiment 1

[0050] Step a, dissolve 1g of chitosan in 100ml of aqueous solution, fully stir until dispersed to obtain a chitosan solution with a concentration of 10g / L, add 0.4ml of glacial acetic acid to this solution, and keep stirring evenly during the addition process to A viscous hydrogel was obtained, and then aged for 1.5 hours to obtain a uniform and stable hydrogel.

[0051] In step b, absorb the hydrogel prepared in step a with a rubber dropper and slowly drop it into liquid nitrogen at a rate of 1 drop / s for rapid freezing to obtain a frozen product.

[0052] In step c, the frozen product obtained in step b is put into a freeze dryer and freeze-dried at -50° C. for 1 day to obtain an aerogel.

[0053] In step d, the obtained airgel is calcined at 800° C. under a nitrogen or argon atmosphere at a heating rate of 3° C. to obtain a first calcined product.

[0054] In step e, the obtained first calcined product was mixed with 20ml of water at a mass ratio of first calcined product...

Embodiment 2

[0058] Step a, dissolve 4g of chitosan in 400ml of aqueous solution, fully stir until dispersed to obtain a chitosan solution with a concentration of 10g / L, add 1.6ml of glacial acetic acid to this solution, and stir continuously during the addition process to A viscous hydrogel was obtained, and then aged for 2 hours to obtain a uniform and stable hydrogel.

[0059] In step b, absorb the hydrogel prepared in step a with a rubber dropper and slowly drop it into liquid nitrogen at a rate of 1 drop / s for rapid freezing to obtain a frozen product.

[0060] In step c, the frozen product obtained in step b is put into a freeze dryer and freeze-dried at -50° C. for 1 day to obtain an aerogel.

[0061] In step d, the obtained airgel is calcined at 800° C. under a nitrogen or argon atmosphere at a heating rate of 3° C. to obtain a first calcined product.

[0062] In step e, the obtained first calcined product was mixed with 40ml of water at a mass ratio of first calcined product:KOH=...

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Abstract

The invention belongs to the field of preparation of environmental materials, and provides a preparation method and application of an adsorption and degradation material. The preparation method comprises the step: taking chitosan as a raw material; adding glacial acetic acid into a chitosan solution to obtain hydrogel; slowly dropwise adding the hydrogel into liquid nitrogen and carrying out rapidfreezing; freezing and drying to obtain aerogel; calcining the obtained aerogel at a high temperature in a nitrogen or argon atmosphere to obtain a first calcined product; and adding the primary calcined product and KOH into water according to a mass ratio of 1:1-1:3 to obtain a uniformly mixed suspension, drying to obtain a dried product, carrying out secondary high-temperature calcination on the dried product in a nitrogen or argon atmosphere, washing with diluted hydrochloric acid, deionized water and absolute ethyl alcohol, and drying to obtain the adsorption and degradation material. Theobtained material has a relatively high specific surface area, can be used for catalytic degradation of rhodamine B without depending on a heavy metal catalyst, does not cause secondary pollution tothe environment, and has a relatively good catalytic degradation effect and good cyclicity.

Description

technical field [0001] The invention belongs to the field of preparation of environmental materials, and in particular relates to a preparation method and application of an adsorption degradation material. Background technique [0002] Rhodamine B is a basic dye, which is a typical triphenylmethane dye. It was once widely used as a food additive, and its carcinogenicity was later proved by experiments. According to the carcinogenic risk assessment of chemicals by the International Agency for Research on Cancer, ingestion, inhalation, and skin contact with this substance can cause acute and chronic poisoning. On the other hand, rhodamine B can be absorbed by the intestinal tract and distributed to various organs along with the blood, causing red staining of the skin, mucous membranes, and organs. Under the microscope, mild congestion of blood vessels between the brains, rupture of some myocardial fibers, blurred stripes and Disappeared, deep cytoplasmic eosinophilic staining...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/30C02F1/28B01J23/04B01J21/18C02F101/30
CPCB01J20/24C02F1/286B01J23/04B01J21/18C02F2101/308
Inventor 时鹏辉陆可人亢美欢浩莹戴磊唐梦阳刘灿聂文龙张之赟李世吉支慧王梦媛张雪枫杨玲霞范金辰闵宇霖徐群杰
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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