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Preparation method of functional magnetic absorbent used for treating industrial wastewater

A magnetic adsorbent, industrial wastewater technology, applied in the fields of adsorption water/sewage treatment, chemical instruments and methods, alkali metal oxides/hydroxides, etc. Uniformity, slow magnetic separation speed, etc., to achieve the effect of controllable structure, controllable magnetic content, and fast magnetic response performance

Inactive Publication Date: 2013-09-11
JINGDEZHEN CERAMIC INSTITUTE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the magnetic adsorbents prepared at present have weak magnetic response, slow magnetic separation speed, and uneven particle shape and wide particle size distribution, which greatly reduce the magnetic separation performance of magnetic adsorption materials.
Moreover, the preparation process is generally cumbersome, time-consuming, and energy-intensive.

Method used

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  • Preparation method of functional magnetic absorbent used for treating industrial wastewater
  • Preparation method of functional magnetic absorbent used for treating industrial wastewater
  • Preparation method of functional magnetic absorbent used for treating industrial wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1: Preparation of Amino Functional Magnetic Adsorbent

[0028] Step 1, ferric oxide nanocrystal clusters with high magnetic saturation

[0029] Take 2.2 g of iron sulfate (Fe 2 (SO 4 ) 3 ), 1.8 g of sodium citrate, and 5.6 g of sodium acetate (NaAc), were dissolved in 80 mL of ethylene glycol, and then transferred to a 250 mL three-neck flask, mechanically stirred at room temperature for 1 h, and then the flask was The liquid was transferred into a high-pressure reactor with a capacity of 100 ml and lined with polytetrafluoroethylene, and then the reactor was placed in an oven at 180 °C for 12 h, and then it was taken out and quickly cooled to room temperature with tap water. Finally, the product was washed by magnetic separation, and unreacted reactants were removed by washing with absolute ethanol and deionized water, respectively, until the supernatant was colorless, and then the product was dispersed in absolute ethanol for subsequent use;

[0030] Ste...

Embodiment 2

[0036] Example 2: Preparation of Carboxyl Functional Magnetic Adsorbent

[0037] The preparation of step 1, iron ferric oxide nanocrystal cluster is described in step 1 in embodiment 1;

[0038] Step 2, modifying the double bond functional group on the surface of ferric oxide nanocrystal clusters is as described in step 2 in Embodiment 1;

[0039] The preparation of the magnetic microspheres modified by step 3, surface epoxy functional group is described in step 3 in embodiment 1;

[0040] Step 4, preparation of carboxyl functional magnetic adsorbent;

[0041] Add 50 mg surface epoxy-modified magnetic microspheres, 15 ml water and 0.4 g mercaptoacetic acid into a three-neck flask, control the pH of the solution to 11, control the temperature to 25 °C, and stop the reaction after mechanical stirring for 12 h. The washing product is separated by a magnetic separation method, and the amino functional magnetic adsorbent is obtained after being washed several times with absolut...

Embodiment 3

[0042] Example 3: Preparation of Amino Functional Magnetic Adsorbent

[0043] Step 1, ferric oxide nanocrystal clusters with high magnetic saturation

[0044] Take 5.2 g of ferric chloride hexahydrate, 3 g of sodium citrate, and 15.6 g of ammonium acetate, dissolve them in 150 mL of ethylene glycol, transfer them to a 250 mL three-necked flask, and stir them mechanically at 160 °C After 6 h, transfer the liquid in the flask to a 200 ml high-pressure reaction kettle with a polytetrafluoroethylene liner, then put the reaction kettle in an oven at 200 ° C for 32 h, take it out, and make it dry with tap water. Cool quickly to room temperature. Finally, the product was washed by magnetic separation, and unreacted reactants were removed by washing with absolute ethanol and deionized water, respectively, until the supernatant was colorless, and then the product was dispersed in absolute ethanol for subsequent use;

[0045] Step 2, modifying the surface of ferric oxide nanocrystal...

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Abstract

The invention discloses a preparation method of a functional magnetic absorbent used for treating industrial wastewater. The method comprises the following four steps of: (1) preparing a ferroferric oxide nanocluster with a high magnetic saturation value by solvothermal synthesis; (2) modifying the ferroferric oxide nanocluster surface into a double-bond functional group by adopting a sol-gel process; (3) wrapping the ferroferric oxide nanocluster surface with a polymer shell containing an epoxy functional group in a distilling, precipitating and polymerizing manner; and (4) modifying a microsphere surface into an amino group or a carboxyl group through a ring-opening reaction of the epoxy group. The magnetic absorbent is high in functional group content, fast in magnetic responsiveness, easy for magnetic separation, regular in structure, stable in chemical and physical performances and high in dispersion stability in an aqueous solution; and the surface-modified amino and carboxyl functional groups can efficiently adsorb a plurality of heavy metals or organic pollutants, so that the magnetic absorbent can be applied to the field of industrial wastewater treatment. The preparation method is simple to operate and controllable in process and has a good application prospect.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a preparation method of a functional magnetic adsorbent used for industrial wastewater treatment. Background technique [0002] Printing and dyeing wastewater has the characteristics of high inorganic salt content, complex composition, good chemical stability, and difficult biodegradation. Direct discharge will bring great harm to the environment and seriously damage the survival of aquatic organisms and human health. Adsorption method has the advantages of simple equipment, simple operation method and large-scale application. Therefore, adsorption method is considered to be one of the most thorough and effective dye wastewater treatment methods, and adsorbent is the key to determine the effect of adsorption treatment. [0003] The magnetic adsorbent with magnetic response can be simply and quickly enriched and separated from the water body under the acti...

Claims

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Application Information

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IPC IPC(8): B01J20/26B01J20/28B01J20/30C02F1/28
Inventor 李菊梅江向平熊珊
Owner JINGDEZHEN CERAMIC INSTITUTE
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