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Preparation and application of modified magnetic straw anion adsorbent

An adsorbent and anion technology, which is applied in the field of preparing modified magnetic straw anion adsorbents, to achieve the effects of increased reactive sites, improved mechanical strength and wear resistance, and low price

Active Publication Date: 2014-09-03
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the numerous applications of adsorbents, the research has attached great importance to the removal of anions, but the use of magnetic adsorbents for the adsorption of anions is rarely reported.

Method used

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  • Preparation and application of modified magnetic straw anion adsorbent
  • Preparation and application of modified magnetic straw anion adsorbent
  • Preparation and application of modified magnetic straw anion adsorbent

Examples

Experimental program
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Effect test

Embodiment 1

[0034] A preparation method of a modified magnetic straw anion adsorbent, comprising the following steps:

[0035](1) Take 3g of corn stalks and dry, pulverize, and sieve to make corn stalk particles with a particle size of 500 μm, and mix them with 300ml of Fe 2+ / Fe 3+ The mixed liquid is mixed, the concentration of iron element is 0.2mol / L, Fe 2+ / Fe 3+ Fe in the mixture 2+ : Fe 3+ Molar ratio of 1:2; then add 25mL of 25% ammonia water under stirring condition, stir and react at 70°C for 4 hours, the whole reaction process is carried out in an anaerobic environment, cool down after the reaction, and use a magnet to precipitate the product , and then washed with deionized water, suction filtered, vacuum-dried at 104°C, and passed through a 20-mesh sieve to remove ferric oxide impurities to obtain a magnetic straw adsorbent;

[0036] (2) Mix the magnetic straw adsorbent prepared in step (1) with 20ml epichlorohydrin in a 250mL three-necked flask, stir and add 20ml of N,N...

Embodiment 2

[0040] A preparation method of a modified magnetic straw anion adsorbent, comprising the following steps:

[0041] (1) Take 3g of corn stalks and dry, pulverize, and sieve to make corn stalk particles with a particle size of 400 μm, and mix them with 270ml of Fe 2+ / Fe 3+ The mixed solution is mixed, the concentration of iron element is 0.1mol / L, Fe 2+ / Fe 3+ Fe in the mixture 2+ : Fe 3+ Molar ratio=1:2.5; then add 30mL of 25% ammonia water under stirring condition, stir and react at 80°C for 2.5 hours, the whole reaction process is carried out under anaerobic environment, cool down after the reaction, and use a magnet to separate out the product , and then washed with deionized water, suction filtered, vacuum-dried at 104°C, and passed through a 25-mesh sieve to remove ferric oxide impurities to obtain a magnetic straw adsorbent;

[0042] (2) Mix the magnetic straw adsorbent prepared in step (1) with 12ml of epichlorohydrin in a 250mL three-necked flask, stir and add 12m...

Embodiment 3

[0046] The preparation method of the modified magnetic stalk anion adsorbent as described in Example 1, the difference is:

[0047] (1) Take 3g of corn stalks and dry, pulverize, and sieve to make corn stalk particles with a particle size of 450 μm, and mix them with 400ml of Fe 2+ / Fe 3+ The mixed liquid is mixed, the concentration of iron element is 0.3mol / L, Fe 2+ / Fe 3+ Fe in the mixture 2+ : Fe 3+ Molar ratio=1:3; add 45mL of 25% ammonia water, stir and react at 60°C for 6 hours,

[0048] (2) The addition amount of epichlorohydrin and reaction medium N,N-dimethylformamide (DMF) is 30ml and 5ml respectively, and the reaction is stirred and reacted at 60°C for 60min;

[0049] (3) The amount of cross-linking agent ethylenediamine added is 9 mL, the temperature is controlled at 90°C and the reaction is stirred for 50 minutes. After the reaction is completed, the product is washed with deionized water, filtered with suction, vacuum-dried at 103°C, and passed through a 30-...

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Abstract

The invention relates to preparation and application of a modified magnetic straw anion adsorbent. The preparation method is characterized in that the modified magnetic straw anion adsorbent is prepared in the presence of a N,N-dimethylformamide medium by taking crop straws, epoxy chloropropane and triethylamine as main raw materials, taking a bivalent iron salt and a trivalent iron salt as magnetic reagents, and taking ethidene diamine as a crosslinking agent. The novel modified magnetic straw anion adsorbent prepared by the method has the advantages of simple production process, low cost, simple solid-liquid separation, simplicity in modification, high mechanical strength, wide application range, good adsorption effect, high secondary pollution adsorption amount, particularly has high adsorption amount on Cr (VI) ions and is uniform in magnetic particle attachment, large in specific surface area and high in adhesive force. The adsorbent can be widely applied to various contaminated water bodies containing various anions, such as a eutrophic water body, chromium-containing wastewater, printing and dyeing wastewater and other contaminated water bodies.

Description

technical field [0001] The invention relates to a method for preparing a modified magnetic straw anion adsorbent by using crop straw as a main raw material, and belongs to the technical fields of waste resource utilization, environment and chemistry. Background technique [0002] In the water treatment process, the adsorbent uses its rich pore structure, specific surface area, and the interaction between various active groups on the surface and the adsorbate to extract pollutants from the liquid phase, thereby achieving the effect of water purification. Among them, the advantage of adsorption method compared with other processes is that it can deal with metal ions, refractory organic matter and some anion pollutants that are difficult to be treated by biological methods. But at the same time, there are many shortcomings in the adsorption method. Among them, the difficulty of solid-liquid separation of the adsorbent has always been a major problem hindering the progress of ad...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/28B01J20/30C02F1/28
Inventor 高宝玉宋雯许醒王芳岳钦艳
Owner SHANDONG UNIV
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