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Preparation method and application of magnetic chitosan nanometer material

A chitosan nano, chitosan technology, applied in chemical instruments and methods, alkali metal oxides/hydroxides, inorganic chemistry, etc., can solve difficult separation, poor mechanical strength, chemical resistance of chitosan Weak and other problems, to achieve the effect of solving the phenomenon of agglomeration, strong electrophilicity, and strong adsorption

Inactive Publication Date: 2014-06-18
SOUTHWEST PETROLEUM UNIV
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  • Summary
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AI Technical Summary

Problems solved by technology

Modified by sodium oleate and compounded with modified chitosan, on the one hand solves the problem of magnetic nano-Fe 3 o 4 The agglomeration phenomenon overcomes the shortcomings of chitosan's weak chemical resistance and poor mechanical strength; on the other hand, it solves the problem that it is difficult to quickly separate from water after phosphorus adsorption and removal

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0014] Example 1: Preparation of Magnetic Chitosan Nanomaterials

[0015] (1) Chitosan modification treatment: first add 3g of chitosan powder into the sulfuric acid solution with pH 2 and submerge, soak for 8 hours under magnetic stirring, stop stirring until the chitosan powder is precipitated, and carry out solid-liquid separation. The powder was washed three times with deionized water, then the chitosan powder was put into an oven and dried at 60° C. to form a cake, and pounded into a powder to obtain the modified chitosan.

[0016] (2) Preparation of ferroferric oxide: prepared by co-precipitation method, first put 7.13g FeCl in a beaker 3 ·6H 2 O and 5.56 g FeSO 4 Mix and add deionized water to form a mixed solution of 500ml. Then put the beaker containing the mixed solution into a water bath with a temperature of 60°C, and slowly add ammonia water with a concentration of 3% by mass under stirring until the pH of the mixed solution is 11. After 1 hour of reaction, 1 ...

example 2

[0018] Example 2: Preparation of Magnetic Chitosan Nanomaterials

[0019] The step (1) in Example 1 was omitted, that is, the chitosan was not modified, and the rest of the steps were exactly the same as in Example 1, to prepare magnetic chitosan nanomaterials without chitosan modification.

example 3

[0020] Example 3: The adsorption and removal experiment of phosphorus by magnetic chitosan nanomaterials

[0021] (1) Using a 100ml conical flask as a reactor, add 0.3g of the magnetic chitosan nanomaterial prepared in Example 1.

[0022] (2) Take 50ml of KH with an initial concentration of 5mg / L 2 PO 4 solution, adjust its initial pH to 6 with NaOH solution, add it to the Erlenmeyer flask, then place the Erlenmeyer flask into a full-temperature shaker for oscillating adsorption for 45min, the temperature is set at 25°C, and the speed is set at 180r / min.

[0023] (3) The magnetic chitosan nanomaterials were separated and collected with a magnet, and the supernatant liquid was taken, and the phosphorus content was determined to be 1.97 mg / L, and the removal rate of phosphorus was 61%.

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Abstract

The invention relates to a preparation method and application of a magnetic chitosan nanometer material which is used for removing phosphorus from treated phosphorus wastewater. The magnetic chitosan nanometer material can be used for removing phosphorus in industrial wastewater and domestic wastewater, thus facilitating purification of the environment. According to the technical scheme, the preparation method comprises the following steps: firstly soaking chitosan powder in a sulfuric acid solution, separating, washing, drying, and pounding into powder to obtain modified chitosan; subsequently preparing a mixed solution from ferrous salt and ferric salt, adding ammonia water under water bath till the pH is 11, stirring and reacting for 1 hour, adding a sodium oleate solution and reacting for 3 hours, separating and then washing, drying and grinding solid into fine powder so as to obtain nano ferroferric oxide; and finally preparing a chitosan acetate solution form the modified chitosan, then adding the nano ferroferric oxide, Span-80, liquid paraffin and a glutaraldehyde solution and reacting four 3-4 hours in the water bath, and then separating, washing and drying to prepare the magnetic chitosan nanometer material. By modifying the modified chitosan and the sodium oleate, the adsorption effect is improved by the method; the magnetic chitosan nanometer material is applicable to treatment of the industrial wastewater and the domestic wastewater.

Description

technical field [0001] The invention relates to a preparation method and application of a magnetic chitosan nanometer material used for removing phosphorus in phosphorus-containing wastewater. Background technique [0002] Phosphorus, as an important nutrient element in the biosphere, plays an important role in the growth of plants. However, if the phosphorus content in the water is too high, the algal plants in the water body will multiply excessively, resulting in eutrophication of the water body and deterioration of the water body. At present, a large amount of phosphate enters the water body with the discharge of domestic sewage and industrial sewage, causing eutrophication of the water body. Therefore, phosphorus removal is of great significance for solving water eutrophication. [0003] At present, the commonly used wastewater phosphorus removal methods include chemical methods, biological methods, and adsorption methods. The chemical method is simple in process and...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/28B01J20/30C02F1/28C02F1/58
Inventor 兰贵红罗斌陈秀丽洪霞范强
Owner SOUTHWEST PETROLEUM UNIV
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