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Magnetic arsenic adsorbent and its preparation method and application

An adsorbent and magnetic technology, applied in the field of magnetic arsenic adsorbent and its preparation, can solve problems such as low adsorption capacity, secondary pollution, and large-scale wastewater that limit industrial application

Active Publication Date: 2015-10-28
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, a variety of adsorbents have been developed at home and abroad for the removal of arsenic in the aqueous phase. However, many adsorbents have their own insurmountable defects, such as subsequent recovery difficulties, easy to cause secondary pollution, and low adsorption capacity. Insufficiency severely limits industrial application and large-scale wastewater treatment. Therefore, it is necessary to develop a new type of arsenic-removing adsorbent that is simple and cheap to prepare, has good adsorption capacity, and is easy to recycle.

Method used

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  • Magnetic arsenic adsorbent and its preparation method and application
  • Magnetic arsenic adsorbent and its preparation method and application

Examples

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Effect test

Embodiment 1

[0043] 1) Preparation of magnetic nanoparticles

[0044] 2mmol of FeCl 3 , 1mmol of FeCl 2 Mix 5ml of NaOH aqueous solution with a pH value mutation agent with a concentration of 3.75mol / L in 30ml of solvent water at a speed of 1000rmp, and carry out a co-precipitation reaction at room temperature for 15 minutes. After the reaction is completed, use a magnet to absorb the reaction product. Separation, washing with deionized water for 5 times, the amount of water used for washing is 100ml, to obtain magnetic nanoparticles, and the yield of the obtained product is 98.2%.

[0045] The particle diameter of the magnetic nanoparticles is 12 nm.

[0046] 2) Preparation of magnetic arsenic adsorbent

[0047] Add 1.5 g of magnetic nanoparticles obtained in step 1) to FeCl with a concentration of 0.3 mol / L 2 In 1L of aqueous solution, stir and mix evenly at the speed of 1000rmp, add NaOH aqueous solution with a concentration of 3.75mol / L to adjust the pH value to 8, and carry out em...

Embodiment 2

[0050] 1) Preparation of magnetic nanoparticles

[0051] 10mmol of FeCl 3 , 5mmol of FeCl 2Mix with 20ml of NaOH aqueous solution of pH mutation agent with a concentration of 3.75mol / L in 200ml of solvent water under the condition of rotating speed of 1000rmp and carry out co-precipitation reaction at room temperature for 15 minutes. Separation and washing with deionized water for 5 times, the volume ratio of the water used for each washing to the reaction system was 1:12 to obtain magnetic nanoparticles, and the yield of the obtained product was 96.8%.

[0052] 2) Preparation of magnetic arsenic adsorbent

[0053] Add 1 g of magnetic nanoparticles obtained in step 1) to Fe(NO 3 ) 2 In the 0.6L aqueous solution, stir and mix evenly at the speed of 1000rmp, add NaOH aqueous solution with a concentration of 3.75mol / L to adjust the pH value to 10, and carry out the embedding reaction at 30°C for 10 minutes, and then add the mass percent concentration 90ml of 40% oxidant hydr...

Embodiment 3

[0055] 1) Preparation of magnetic nanoparticles

[0056] 20mmol of FeCl 3 , 10mmol of FeCl 2 Mix 50ml of NaOH aqueous solution with a pH value mutation agent with a concentration of 3.75mol / L in 300ml of solvent water under the condition of a rotation speed of 1000rmp, and carry out co-precipitation reaction at room temperature for 15 minutes. After the reaction is completed, use a magnet to absorb the reaction product. Separation and washing with deionized water for 5 times, the volume ratio of the water used for each washing to the reaction system was 1:12 to obtain magnetic nanoparticles with a yield of 99.3%.

[0057] The particle size of the magnetic nanoparticles is 12 nm.

[0058] 2) Preparation of magnetic arsenic adsorbent

[0059] Add 1 g of magnetic nanoparticles obtained in step 1) to FeSO with a concentration of 0.3 mol / L 4 In the 0.6L aqueous solution, stir and mix evenly at the speed of 1000rmp, add NaOH aqueous solution with a concentration of 3.75mol / L to ...

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Abstract

The invention discloses a magnetic arsenic adsorbent as well as a preparation method and application thereof. The preparation method comprises the following step of: reacting in FeCl2 liquor mixed with magnetic nano particles by using NaOH liquor as a pH value regulator and using hydrogen peroxide as an oxidant, so as to obtain the magnetic absorbent. Specially, the preparation method comprises the following steps of: adding pre-prepared magnetic nano particles into the FeCl2 liquor, uniformly mixing under a normal-temperature condition; dropwise adding NaOH aqueous liquor under a high-speed stirring condition, so as to regulate the pH value to 8.0; adding hydrogen peroxide in the case that green precipitates are generated; and regulating the pH value back to 8.0 by using the NaOH aqueous liquor to obtain the adsorbent. The adsorbnet provided by the invention has a series of advantages of large adsorbing capacity, high adsorbing speed, small influences on the absorbing process, good regenerating performance and the like, is easy to recycle, and has important practical application value.

Description

technical field [0001] The invention belongs to the field of environmental water treatment, and relates to a magnetic arsenic adsorbent and a preparation method and application thereof. Background technique [0002] Arsenic has strong biological toxicity to the human body and serious hazards of three causes (teratogenic, carcinogenic, and mutagenic). At present, both the US Centers for Disease Control and the International Agency for Research on Cancer have identified arsenic compounds as the first class of carcinogens. There are strict regulations on the content of arsenic in water at home and abroad. The maximum concentration of arsenic in drinking water should not exceed 0.01mg / L, and the concentration of arsenic in industrial wastewater should not exceed 0.5mg / L. In recent years, the phenomenon of arsenic pollution has become more and more serious due to natural release and large-scale artificial mining, production and use. A large amount of arsenic-containing wastewat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/06B01J20/28B01J20/30C02F1/28C02F1/62
Inventor 林森张红兴卢滇楠汪广兴刘铮陈传治朱文超
Owner TSINGHUA UNIV
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