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High-efficiency superparamagnetic ferrite nano arsenic adsorbent and preparation process thereof

A superparamagnetic and preparation technology, which is applied in the direction of adsorption of water/sewage treatment, other chemical processes, alkali metal oxides/hydroxides, etc., can solve the problems of adsorbent recycling and harmful ions exceeding the standard, and achieve energy saving , low cost of raw materials, easy to control the effect

Inactive Publication Date: 2012-07-04
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to provide a high-efficiency magnetic ferrite nano-arsenic adsorbent and its preparation process. The prepared nano-ferrite can well remove harmful ions in water (taking arsenic as an example), and exhibits strong magnetic properties. Recycling capacity to solve the current problems of excessive harmful ions in water and recycling of adsorbents

Method used

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  • High-efficiency superparamagnetic ferrite nano arsenic adsorbent and preparation process thereof
  • High-efficiency superparamagnetic ferrite nano arsenic adsorbent and preparation process thereof
  • High-efficiency superparamagnetic ferrite nano arsenic adsorbent and preparation process thereof

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Embodiment 1

[0035] The method provided by the invention is used to prepare high-efficiency superparamagnetic magnesium ferrite nano-arsenic adsorbent, and its technological process is as follows:

[0036] Under magnetic stirring, the anhydrous FeCl 3 (1.13g) and MgCl 2 (0.075g) is dissolved in dehydrated alcohol (80m1) and is configured into the chloride ethanol solution that molar concentration is 0.1M, then a certain amount of NaOH is slowly added in the chloride ethanol solution (the addition of sodium hydroxide=metal ion The valence state × the amount of metal chloride added, the two metal ions Mg 2+ with Fe 3+ Total after calculation respectively), fully mixed for 1 h under the action of magnetic stirring, and then introduced into a polytetrafluoroethylene reactor for solvothermal reaction. The temperature of the solvothermal reaction is 150 ° C, and the solvothermal time is 2 h. After the mixed solution was cooled to room temperature, it was centrifuged and ultrasonically washed....

Embodiment 2

[0045] The difference from Example 1 is that the method provided by the present invention is used to prepare high-efficiency superparamagnetic manganese ferrite nano-arsenic adsorbent, and the prepared superparamagnetic nano-manganese ferrite powder is fully crystallized cubic spinel Mn 0.11 Fe 2.52 o 4 Phase, the specific surface area is 389m 2 / g, the particle size is 3-6nm.

[0046] When the adsorbent is used at 0.04g / L for one time, the adsorption efficiency of trivalent arsenic or pentavalent arsenic is 100%; the water sample after arsenic adsorption is magnetically separated to obtain nano-ferrite phase particles, and then washed with alkali Desorption and recycling, after 3-5 times of recycling, the adsorption efficiency of trivalent arsenic or pentavalent arsenic is 70-80%.

Embodiment 3

[0048] The difference from Example 1 is that the method provided by the present invention is used to prepare a high-efficiency superparamagnetic zinc ferrite nano-arsenic adsorbent, and the prepared superparamagnetic nano-zinc ferrite powder is a fully crystallized cubic spinel Zn 0.45 Fe 2.37 o 4 Phase, the specific surface area is 330m 2 / g, the particle size is 4-8nm.

[0049] When the adsorbent is used at 0.05g / L for one time, the adsorption efficiency of trivalent arsenic or pentavalent arsenic is 100%; the water sample after arsenic adsorption is magnetically separated to obtain nano-ferrite phase particles, and then washed with alkali Desorption and recycling, after 3-5 times of recycling, the adsorption efficiency of trivalent arsenic or pentavalent arsenic is 70-80%.

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Abstract

The invention belongs to the field of nano adsorption materials and in particular relates to a high-efficiency superparamagnetic ferrite nano arsenic adsorbent and a preparation process thereof. The prepared nano ferrite can well remove harmful ions (such as arsenic) from water and has strong magnetic recovery capacity, so that the problems of excessive harmful ions in the water and incapability of recovery of the adsorbent at present are solved. The adsorbent consists of superparamagnetic spinel ferrite phase nanoparticles and is nanopowder with the grain size of 3 to 8 nm, wherein the specific surface area is 100 to 500 m<2> / g. According to the process, pure crystallized nano ferrite powder is prepared by using anhydrous metal chloride, absolute ethanol and sodium hydroxide as reaction precursors and performing solvent thermal reaction. The prepared superparamagnetic ferrite nanoparticles are high in purity, small in grain size, high in specific surface area and high in hydrophilicity and more new selectable materials are provided for reducing the harmful ion (such as arsenic) content of water.

Description

technical field [0001] The invention belongs to the field of nano-adsorption materials, and specifically relates to a high-efficiency superparamagnetic ferrite nano-arsenic adsorbent and a preparation process thereof. The prepared nano-oxide has strong arsenic adsorption capacity, water dispersion capacity and magnetic recovery capacity. Background technique [0002] For a long time, the harm of arsenic in water to human health has been the focus of attention. Studies have shown that long-term use of water containing low arsenic concentrations can also lead to the occurrence of many diseases. According to the newly promulgated drinking water standard (GB5479-2006) in 2006, the concentration standard of arsenic in drinking water is 0.01mg / L. Therefore, the removal of arsenic in water has become a hot topic in the field of environmental research, and adsorption is a simple and efficient method for arsenic treatment. [0003] The preparation of high-efficiency adsorption mate...

Claims

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Application Information

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IPC IPC(8): B01J20/02B01J20/28B01J20/30C02F1/28C02F1/58
Inventor 唐文书李琦高世安尚建库
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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