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Iron-manganese oxide composite material loaded with zero-valent iron, its preparation method and application

A technology of iron and 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 and insufficient activation. Sulfate, low efficiency, etc., to achieve the effect of enhancing the degradation and removal of pollutants, uniform solid particle size, and high reducibility

Active Publication Date: 2021-05-07
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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  • Iron-manganese oxide composite material loaded with zero-valent iron, its preparation method and application
  • Iron-manganese oxide composite material loaded with zero-valent iron, its preparation method and application
  • Iron-manganese oxide composite material loaded with zero-valent iron, its preparation method and application

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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 iron-manganese oxide composite material (FMBO@ZVI) loaded with zero-valent iron, the steps are as follows:

[0020] (1) Mix and dissolve ferrous salt and stabilizer, add alkaline solution under stirring, generate flocculent precipitate;

[0021] (2) Add permanganate solution to the flocculent precipitate obtained in step (1), react to obtain a precipitate, and obtain an iron-manganese oxide precursor after separation and cleaning;

[0022] (3) In a protective atmosphere, dissolve the iron salt and the dispersant in a container equipped with ethanol / water mixture, and adjust the pH to a certain range;

[0023] (4) Add the iron-manganese oxide precursor prepared in step (2) to the mixture obtained in step (3), and in a protective atmosphere, add a certain amount of redu...

Embodiment 1

[0057] In this example, a simple and feasible chemical co-precipitation synthesis method is used to prepare FMBO materials, wherein the molar ratio of iron to manganese is 4.5:1, and the specific operations are 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 age for 12 hours, and a dark brown precipitate was formed. After the mixed liquid was cooled to room temperature, it was centrifugally filtered, rinsed 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 composite material is through F 4.5 m 1 The adsorption capacity of BO precursor will FeSO 4 ·7H 2 The O solution is adsorbed to...

Embodiment 2

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

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Abstract

A preparation method and application of an iron-manganese oxide composite material loaded with zero-valent iron. The present invention adopts co-precipitation redox method, selects ferrous salt, stabilizer and permanganate to prepare iron manganese oxide (FMBO) precursor, drops reducing agent and iron salt into the solution containing FMBO in a protective atmosphere, Stirring, filtering, washing and freeze-drying, thereby preparing the iron-manganese oxide composite material loaded with zero-valent iron (FMBO@ZVI). The powder prepared by the present invention has a large specific surface area, a smooth surface, and is formed by densely arranged spherical structure particles, and the particle size is uniform, wherein the atomic percentage of zero-valent iron (ZVI) is 50% to 80%; the powder of the present invention The preparation process is simple and easy, the reaction conditions are mild, and the raw materials are cheap and easy to obtain; the prepared material has high reactivity and reducibility, can fully exert the reduction effect of zero-valent iron, and greatly enhance the degradation effect on refractory nitrobenzene .

Description

technical field [0001] The invention belongs to the field of environmental functional composite materials and the technical field of water treatment, and in particular relates to an environmental composite material, more specifically to a ferromanganese oxide (FMBO) composite material loaded with zero-valent iron (ZVI) (FMBO@ZVI), its preparation method and application. Background technique [0002] In situ chemical oxidation (ISCO) of groundwater has become one of the most powerful means to remove refractory organic pollutants. 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 abundant sources and environmental friendliness, FMBO can effectively activate persulfate (PMS) to oxidize and degrade org...

Claims

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Application Information

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Patent Type & Authority Patents(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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