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A preparation method and application of a carbon-loaded magnetic fiber material with a one-dimensional core-shell structure

A magnetic fiber, core-shell structure technology, applied in chemical instruments and methods, other chemical processes, alkali metal oxides/hydroxides, etc., can solve the problems of large consumption of adsorption materials, increased processing costs, and low removal capacity. , to reduce the cost of separation operation, increase the contact area, and achieve good water dispersion.

Active Publication Date: 2015-12-02
安徽工大化工科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, the literature "Journal of Colloid and Interface Science 349 (2010) 256–264" proposes to use wheat waste to remove hexavalent chromium from water, but it is necessary to use epichlorohydrin, diethylenetriamine, triethylamine borane, etc. in specific conditions for wheat waste. modified under conditions; the biomass material announced by patent CN102380355B uses eggshell membrane (ESM) as the detoxification adsorbent for hexavalent chromium, but it needs to be modified with polyethyleneimine (PEI), which increases the processing cost; the document "Journal of Hazardous Materials 150 (2008 ) 446–452”, “Chemical Engineering Journal 184(2012) 238–247”, although untreated biological materials straw and peanut shells were used to treat hexavalent chromium, although the cost of the adsorbent material was low, the removal capacity was low, and the adsorbent material was consumed during the treatment. Large amount, difficult to popularize and apply in practice

Method used

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  • A preparation method and application of a carbon-loaded magnetic fiber material with a one-dimensional core-shell structure
  • A preparation method and application of a carbon-loaded magnetic fiber material with a one-dimensional core-shell structure
  • A preparation method and application of a carbon-loaded magnetic fiber material with a one-dimensional core-shell structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The first step, preparation of iron cobalt oxalate nanofibers:

[0032] (1) Fully dissolve 19.6g of ferrous ammonium sulfate and 7.1g of cobalt sulfate in a mixed solvent of ethylene glycol and water (500mL), and dissolve 9.45g of oxalic acid in a mixed solvent of ethylene glycol and water with the same volume ratio (500mL);

[0033] Wherein the volume ratio of ethylene glycol and water is 3:1;

[0034] (2) Add the oxalic acid solution into the mixture of ferrous iron and cobalt, stir evenly, seal the container, let it stand at 120°C for 24 hours, cool it, then filter the feed liquid to remove the solvent, recover the filtrate for later use, and put the filter cake in the air at 100°C. Air-dried for 5 hours to prepare iron-cobalt oxalate nanofibers.

[0035] The second step, preparation of cobalt ferrite nanofibers:

[0036] The above-mentioned iron-cobalt oxalate nanofibers were placed in a muffle furnace, and the temperature was raised to 500° C. at a rate of 1° C....

Embodiment 2

[0044] The first step, preparation of iron cobalt oxalate nanofibers:

[0045] (1) Fully dissolve 13.9g of ferrous ammonium sulfate and 7.3g of cobalt nitrate in the mixed solvent (400mL) of ethylene glycol and water recovered in Example 1, and dissolve 10.1g of sodium oxalate in the recovered B Diol and water mixed solvent (400mL);

[0046] (2) Add the sodium oxalate solution into the mixed solution of ferrous iron and cobalt, stir evenly, seal the container, let it stand at 150°C for 10 hours, cool it and filter the feed liquid to remove the solvent, recover the filtrate for later use, and put the filter cake in the air at 100°C Air-dried for 5 hours to obtain iron-cobalt oxalate nanofibers.

[0047] The second step, preparation of cobalt ferrite nanofibers:

[0048] The above-mentioned iron-cobalt oxalate nanofibers were placed in a muffle furnace, and the temperature was raised to 500° C. at a rate of 1° C. / min, and kept for 3 hours to prepare cobalt ferrite nanofibers. ...

Embodiment 3

[0054] The first step, preparation of iron cobalt oxalate nanofibers:

[0055] (1) Fully dissolve 19.6g of ferrous ammonium sulfate and 6.0g of cobalt chloride in the mixed solvent (300mL) of ethylene glycol and water recovered in Example 2, and dissolve 10.5g of sodium oxalate in the mixed solvent of ethylene glycol and water recovered in Example 2 Ethylene glycol and water mixed solvent (300mL);

[0056] (2) Add the sodium oxalate solution into the mixture of ferrous iron and cobalt, stir evenly, seal the container, let it stand at 180°C for 6h, cool it, then filter the feed liquid to remove the solvent, and dry the filter cake in the air at 100°C for 5h , to prepare iron-cobalt oxalate nanofibers.

[0057] The second step, preparation of cobalt ferrite nanofibers:

[0058] The above-mentioned iron-cobalt oxalate nanofibers were placed in a muffle furnace, and the temperature was raised to 600° C. at a rate of 5° C. / min, and kept for 2 hours to prepare cobalt ferrite nanof...

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Abstract

The invention discloses a preparation method and application of a carbon-loaded magnetic fiber material composite with a one-dimensional core-shell structure, belonging to the field of water treatment. The preparation method of the present invention adopts cobalt ferrite nanofiber as a carrier, biomass material-soluble starch powder as a carbon source precursor, and prepares a carbon-loaded magnetic fiber material composite material with a one-dimensional core-shell structure. The carbon layer rich in hydroxyl and carboxyl groups of the material prepared by this method is evenly coated on the cobalt ferrite nanofiber matrix, and the formed composite material has good magnetic response and can effectively remove hexavalent chromium in water. The preparation method of the present invention has the characteristics of simple process, recyclable solvent, low preparation cost, and the biomass material is carbon source and environment-friendly.

Description

technical field [0001] The invention relates to the field of water treatment, in particular to water treatment containing hexavalent chromium ions, in particular to a carbon-based magnetic fiber material for removing hexavalent chromium from water and a preparation method thereof. Background technique [0002] In recent years, the treatment of wastewater containing hexavalent chromium has become a hot issue concerned by environmental workers. Chromium is a heavy metal widely used in industrial production. Electroplating, printing and dyeing, and chromium salt chemical production are the main sources of chromium-containing wastewater. The heavy metal chromium in water usually exists in two valence forms of Cr(III) and Cr(VI), among which Cr(VI) is the most toxic and is one of the 129 hazardous pollutants recognized by the US EPA. Cr(VI) has good water solubility, strong oxidizing property and easy migration. It can penetrate biomembrane and be enriched and transferred throu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/20B01J20/28B01J20/30C02F1/28C02F101/22
Inventor 贾志刚杨路路刘建红王秋泽诸荣孙
Owner 安徽工大化工科技有限公司
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