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Zero-valent iron-loaded iron-manganese oxide composite material and preparation method and application thereof

A technology of iron-manganese oxides and composite materials, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, chemical/physical processes, etc., can solve the problem of low efficiency of active oxygen species, low efficiency, Unable to fully activate persulfate and other problems, to achieve the effects of enhanced pollutant degradation and removal, high reducibility, and uniform solid particle size

Active Publication Date: 2020-02-28
CHINESE RES ACAD OF ENVIRONMENTAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, the advanced oxidation technology based on activated persulfate has received widespread attention, because this technology has the advantages of high degradation efficiency, wide application range, and no secondary pollution; iron manganese oxide (FMBO), as a common mineral in groundwater, With the characteristics of rich sources and environmental friendliness, FMBO can effectively activate persulfate (PMS) to oxidize and degrade organic pollutants, but the efficiency of activating persulfate (PS) to degrade organic pollutants is not high
For example, in actual typical soil applications, it was found that the FMBO activation of PS in natural soils was inefficient to generate reactive oxygen species and could not fully activate persulfate

Method used

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  • Zero-valent iron-loaded iron-manganese oxide composite material and preparation method and application thereof
  • Zero-valent iron-loaded iron-manganese oxide composite material and preparation method and application thereof
  • Zero-valent iron-loaded iron-manganese oxide composite material and preparation method and application thereof

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preparation example Construction

[0019] figure 1 It is a schematic diagram of the preparation process of the FMBO@ZVI composite material of the present invention. like figure 1 As shown, the present invention discloses a preparation method of a zero-valent iron-loaded iron-manganese oxide composite material (FMBO@ZVI), and the steps are as follows:

[0020] (1) mixing and dissolving ferrous salt and stabilizer, adding alkaline solution under stirring to generate flocculent precipitation;

[0021] (2) adding permanganate solution to the flocculent precipitate obtained in step (1), reacting to obtain precipitation, and obtaining iron-manganese oxide precursor after separation and cleaning;

[0022] (3) in protective atmosphere, iron salt and dispersant are dissolved in the container that ethanol / water mixed solution is housed, adjust pH to a certain range;

[0023] (4) adding the iron-manganese oxide precursor prepared in step (2) to the mixture obtained in step (3), in a protective atmosphere, adding a cert...

Embodiment 1

[0057] The present embodiment adopts the simple and feasible chemical co-precipitation synthesis method to prepare FMBO material, wherein the molar ratio of iron and manganese is 4.5: 1, and the specific operation is as follows:

[0058] First, 0.045mol FeSO 4 ·7H 2 O and 9g of polyvinylpyrrolidone (PVP) were dissolved in 900mL of water and heated to 90°C, then 18mL of 5M NaOH solution was added dropwise under magnetic stirring, and dark green Fe(OH) was formed in the solution. 2 Precipitate, add 10mL, 1M KMnO after 5min 4 The solution was left to stand for 12h and a dark brown precipitate was formed. After the mixed liquid was cooled to room temperature, it was centrifugally filtered, washed with ultrapure water and ethanol three times, freeze-dried, ground and sieved to obtain F. 4.5 M 1 Powder of BO.

[0059] F in this example 4.5 M 1 BO@ZVI composites are made by F 4.5 M 1 The adsorption ability of the BO precursor can convert FeSO 4 ·7H 2 The O solution adsorbe...

Embodiment 2

[0065] The preparation method is the same as that in Example 1, except that the molar ratio of iron and manganese is 1:1.

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Abstract

The invention discloses a preparation method and application of a zero-valent iron-loaded iron-manganese oxide composite material. According to the invention, a coprecipitation oxidation-reduction method is adopted. The preparation method comprises the following steps: selecting a ferrous salt, a stabilizer and permanganate to prepare an iron-manganese oxide (FMBO) precursor, dropwise adding a reducing agent and a ferric salt into a solution containing the FMBO in a protective atmosphere, and carrying out stirring, filtering, washing and freeze-drying so as to prepare the zero-valent iron-loaded iron-manganese oxide composite material (FMBO@ZVI). The powder prepared in the invention is large in specific surface area and smooth in morphology and surface, formed by densely arranging spherical structure particles and uniform in particle size, and the atomic% of zero-valent iron (ZVI) is 50%-80%. The preparation method is simple and feasible in process and mild in reaction conditions and uses cheap and easily-available raw materials; and the prepared material has high reaction activity and reducibility, give full play to the reduction effect of zero-valent iron, and greatly enhances the degradation effect on nitrobenzene which is difficult to degrade.

Description

technical field [0001] The invention belongs to the field of environmental functional composite materials and the technical field of water treatment, in particular to an environmental composite material, and more particularly to a zero-valent iron (ZVI)-loaded iron manganese oxide (FMBO) composite material (FMBO@ZVI), its preparation method and application. Background technique [0002] In situ chemical oxidation of groundwater (ISCO) has become one of the most powerful means to remove refractory organic pollutants. Among them, advanced oxidation technology based on activated persulfate has received extensive attention, because this technology has the advantages of high degradation efficiency, wide application range, and no secondary pollution; iron manganese oxide (FMBO), as a common mineral in groundwater, With the characteristics of abundant sources and environmental friendliness, FMBO can effectively activate persulfate (PMS) to oxidize and degrade organic pollutants, b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/889B01J35/08B01J35/10C02F1/72C02F101/38C02F101/34
CPCB01J23/8892B01J23/002C02F1/725C02F2103/06C02F2101/38C02F2101/34B01J35/51B01J35/613
Inventor 徐祥健姜永海席北斗杨昱夏甫韩旭廉新颖贾永锋郇环王月
Owner CHINESE RES ACAD OF ENVIRONMENTAL SCI
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