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Fe/Mn composite oxide, preparation method and application thereof

A composite oxide, iron-manganese technology, applied in chemical instruments and methods, water pollutants, other chemical processes, etc., can solve the problem that the properties of iron-manganese composite oxides are unstable, the oxidation process takes a long time, and it is not suitable for preparing compounds. and other problems, to achieve the effect of low cost, regular shape and good dispersion

Active Publication Date: 2015-08-05
SHANDONG NORMAL UNIV
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Problems solved by technology

[0004] The preparation method and conditions of iron-manganese composite oxides are an important factor in the study of the adsorption performance of iron-manganese composite oxides. The properties of the iron-manganese composite oxides prepared by the precipitation method are unstable, and the oxidation process takes a long time, and the preparation process needs to be carried out step by step, which increases the cost; the hydrothermal method is a common method for preparing nanomaterials. The substance particles have high purity, good dispersibility, good and controllable crystal form, and low production cost, but it is not suitable for preparing some compounds that are easy to react with water or easy to hydrolyze and decompose, while iron oxides are easy to hydrolyze
Iron oxides and manganese oxides tend to spontaneously react to form complexes under normal temperature and pressure conditions. The hydrothermal method is carried out under high temperature and high pressure conditions. Therefore, the direct hydrothermal method to prepare iron-manganese composite oxides is prone to agglomeration

Method used

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  • Fe/Mn composite oxide, preparation method and application thereof
  • Fe/Mn composite oxide, preparation method and application thereof
  • Fe/Mn composite oxide, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment 1: the preparation of iron-manganese composite oxide

[0035] The specific preparation method is as follows:

[0036] (1) Take a certain quality of potassium permanganate (KMnO 4 ) and ferrous sulfate heptahydrate (FeSO 4 ·7H 2 O) were ultrasonically dissolved in 100mL twice distilled water (the ratio of the amount of iron to manganese substance was 3:1), and after returning to 25°C, the KMnO 4 The solution was transferred to a 250mL round-bottomed flask added with a magnet, and stirred on a temperature-controlled magnetic stirrer;

[0037] (2) FeSO 4·7H 2 The O solution was transferred to a 100mL constant pressure dropping funnel, and was added dropwise to the KMnO at a rate of 1d / s. 4 solution, a brownish red suspension was obtained. During the reaction process, the pH of the solution was adjusted to 3.0-4.0 with 1 mol / L dilute hydrochloric acid solution continuously. At room temperature, the reaction continued for 1 h;

[0038] (3) Transfer the br...

Embodiment 2

[0058] Embodiment 2: The adsorption test of iron-manganese composite oxide to chromium in water

[0059] 1. The effect of the addition amount of iron-manganese composite oxide on the adsorption of Cr(VI)

[0060] Under the condition of a certain concentration of adsorbate, the amount of adsorbent input will directly affect the adsorption efficiency, and for a certain amount of adsorbent, the amount of adsorbate in the solution will directly affect the degree to which the adsorption site of the adsorbent is utilized. , so the effect of the amount of adsorbent added on the adsorption performance has received greater attention from researchers. This experiment will investigate the effect of five gradients of adsorbent dosages of 1.0, 2.0, 3.0, 4.0, and 5.0 g / L on the adsorption performance of iron-manganese composite oxides. The specific test operation is as follows:

[0061] At room temperature at 25°C, take 5 conical flasks with stoppers, add 0.05, 0.10, 0.15, 0.20, 0.25 g of...

Embodiment 3

[0084] Example 3: Cost accounting

[0085] (1) Raw material cost: ferrous sulfate 400 yuan / ton; potassium permanganate 10,000 yuan / ton;

[0086] According to experiments, the mass ratio of ferrous sulfate and potassium permanganate is 5:1, so the raw material cost is:

[0087] 1 ton of ferrous sulfate is 400 yuan, 200kg of potassium permanganate is 2,000 yuan, a total of 2,400 yuan;

[0088] These raw materials can produce 1 ton of adsorbent, that is, the cost of 1 ton of adsorbent is 2400 yuan.

[0089] (2) 1g of adsorbent treats 2.5L wastewater, 1kg treats 2500L (2.5m 3 ), 1 ton handles 2500m 3 2400 yuan to process 2500m 3 of water, that is, 0.96 yuan to treat 1m 3 waste water.

[0090] (3) In the prior art, the commonly used chemical method is used to process 1kg Cr 6+ See Table 1 for the dosage and cost of the medicines.

[0091] Table 1 Commonly used chemical methods to treat 1kg Cr 6+ Drug dosage and cost comparison

[0092]

[0093]The data in Table 1 are q...

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Abstract

The invention discloses a preparation method of a Fe / Mn composite oxide, wherein the preparation method includes following steps: (1) adding dropwisely a FeSO4.7H2O solution into a KMnO4 solution, carrying out a reaction at 15-25 DEG C for 1-1.5 h to obtain a brown-red suspension, wherein the pH of the solution is regulated to be 3.0-4.0 in the reaction; (2) moving the brown-red suspension into a reaction kettle, carrying out a reaction for 5-7 h at 160-200 DEG C, cooling a reaction product and performing centrifugation to obtain a brown-red precipitation, and washing the brown-red precipitation until electric conductivity of a washing liquid does not change; and (3) aging the brown-red precipitation at room temperature for 3.5-4.5 h, drying and grinding the aged precipitation to obtain the Fe / Mn composite oxide powder. The Fe / Mn composite oxide is crude in surface and is large in specific surface area. A uniform pore structure is formed among fine particles on the surface of the composite oxide, so that chromium ion in water can be adsorbed therein easily. The Fe / Mn composite oxide is suitable for treatment of chromium-containing waste water in different concentrations, is high in removal rate and is low in cost.

Description

technical field [0001] The invention relates to an iron-manganese composite oxide and its preparation method and application, belonging to the technical field of water treatment. Background technique [0002] Chromium is a very important metal element in the environment, and it is widely distributed in the earth's crust. With the rapid development of the industrial and agricultural economy, the problem of environmental pollution caused by metal chromium is becoming more and more severe in the process of industrialized cities. A large number of chromium-containing ores are used in the production and manufacturing processes of industries such as electroplating, tanning, mining, metal smelting, and metal surface treatment. , material materials, etc., resulting in a large amount of chromium-containing pollutants entering the water body environment through various channels (such as industrial chromium-containing wastewater discharge, chromium slag stacking, etc.), and then causin...

Claims

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Application Information

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IPC IPC(8): B01J20/06B01J20/30C02F1/28C02F1/62C02F101/22
Inventor 王炜亮鞠甜甜刘玉真王玉番杨传玺刘晓晖
Owner SHANDONG NORMAL UNIV
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