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Preparation method and application of magnetic composite arsenic adsorbent

An adsorbent and magnetic technology, which is applied in the field of preparation of magnetic composite arsenic adsorbent, can solve problems such as non-magnetic separation, and achieve the effects of convenient use, fast and effective arsenic removal, and thorough treatment

Active Publication Date: 2014-10-08
PEKING UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

Chinese patent CN100509137C (2009.07.08) discloses a composite adsorbent with iron-manganese composite oxide as the main functional component and diatomite as the carrier, but the adsorbent is not a nano-scale adsorbent that can be magnetically separated

Method used

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Examples

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Embodiment 1

[0025] Into a 500mL three-neck round bottom flask, add 200mL containing 0.10mol / L FeSO4 and 0.15mol / L FeCl 3 solution, molar ratio Fe 2+ :Fe 3+=2:3, at room temperature and under electric stirring at 240 rpm, add 2 mol / L NaOH solution dropwise to the solution until the pH reaches 10, a black precipitate is formed in the solution, continue to stir for 30 minutes, and remove the crude product with the help of a permanent magnet The magnetic nanoparticles were separated by washing with deionized water until the pH of the eluent reached 7 to obtain magnetic nanoparticles; the obtained magnetic nanoparticles were transferred back to the three-necked flask, and 200 mL of deionized water was added to ultrasonically disperse for 2 minutes, at room temperature and maintained at 300 rpm Add 0.6mol / L FeCl to the three-neck flask through two different necks at the same time at an equal flow rate of 3mL / min under electric stirring per minute. 3 +0.3mol / L MnSO 4 The mixed solution and 3m...

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Abstract

The invention relates to a preparation method and an application of magnetic compound arsenic adsorption agent. The method comprises the following steps of preparing magnetic nano particles; cladding the surfaces of the magnetic nano particles with iron and manganese hydroxide precipitates through a heterogeneous nucleation process; oxidizing the clad manganese; and dehydrating and drying to obtain the magnetic compound arsenic adsorption agent which is coated with the amorphous iron manganese compound oxide. Details of the preparation method are shown in a specification. The method and the application have the advantages that the method for wrapping the amorphous iron manganese compound oxide on the surface of the magnetic nano materials is disclosed at first time, the preparation condition is moderate, raw material cost is low, the arsenic can be rapidly and effectively removed and thoroughly processed, convenience in application is realized, the magnetic solid-liquid separation process is fast, the compound adsorption agent is safe and stable, iron or manganese is not released to the solution after the compound adsorption agent is reacted with low-concentration trivalent arsenic, and the effectiveness and recyclability of the compound arsenic adsorption agent can be realized. The application of the magnetic compound arsenic adsorption agent is characterized in that the magnetic compound arsenic adsorption agent is mainly used for eliminating inorganic trivalent arsenic with large toxicity in underground water or drinking water.

Description

technical field [0001] The invention relates to a preparation method and application of a chemical composition, more specifically to a preparation method and application of a magnetic composite arsenic adsorbent. Background technique [0002] Long-term consumption of arsenic-rich water can lead to cancer and other diseases. Arsenic in natural water mainly exists in the form of inorganic pentavalent arsenic (arsenic acid and its salts) and trivalent arsenic (arsenous acid and its salts). In groundwater, trivalent arsenic is more common (Smedley P L, Kinniburgh D G.A review of the source, behavior and distribution of arsenic in natural waters[J].Applied Geochemistry,2002,17(5):517-568 .). Trivalent arsenic is more toxic than pentavalent arsenic (Korte N E, Fernando Q.A review of arsenic(III) in groundwater[J].Critical Reviews in Environmental Control,1991,21(1):1-39.), and three When the pH value is less than 9.2, the valent arsenic is mainly in the neutral molecular state ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/06B01J20/28B01J20/30C02F1/28C02F1/58
Inventor 童美萍单超
Owner PEKING UNIV
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