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Manganese dioxide and sulfite system and preparation method and application thereof

A technology of sulfite and manganese dioxide, which is applied in chemical instruments and methods, oxidized water/sewage treatment, metal/metal oxide/metal hydroxide catalysts, etc. Low affinity and other problems, achieve low cost, increase hydrolysis and oxidative degradation rate, and improve oxidation efficiency

Active Publication Date: 2019-02-15
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are some restrictive factors in this method, especially the poor affinity for organic pollutants with less hydroxyl structure (such as organophosphorus pesticides), insufficient contact with manganese dioxide, dark and neutral underground environments and other factors make the degradation efficiency not high. The application of manganese oxide is greatly limited
[0003] At present, there are technologies such as manganese dioxide activated persulfate, potassium permanganate combined with sulfite, etc. to generate sulfuric acid free radicals to degrade organic pollutants. Although the reaction rate is fast, the high Oxidative free radicals are easily quenched. In order to ensure its high degradation efficiency, conditions such as low pH value and oxygen flow are often required, and there are disadvantages such as expensive system and difficult operation. Therefore, it is necessary to develop an efficient in-situ technology to degrade organic compounds. Manganese dioxide / sulfite system for phosphorus pesticides

Method used

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  • Manganese dioxide and sulfite system and preparation method and application thereof
  • Manganese dioxide and sulfite system and preparation method and application thereof
  • Manganese dioxide and sulfite system and preparation method and application thereof

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preparation example Construction

[0036] The preparation process of nano manganese dioxide is:

[0037] Step S1.1, to manganese sulfate (MnSO 4 ·H 2 0) adding ultrapure water to the solid, heating in a water bath, and stirring until the manganese sulfate solid is completely dissolved to obtain an aqueous solution of manganese sulfate;

[0038] Step S1.2, adding potassium permanganate aqueous solution to the manganese sulfate aqueous solution, stirring while adding, standing still, then removing the supernatant, retaining the precipitate, and repeatedly washing the precipitate with ultrapure water until the supernatant is colorless, Obtain manganese dioxide mineral;

[0039] Step S1.3, using ultrapure water to repeatedly wash the manganese dioxide mineral until the conductivity of the filtrate obtained by filtering is lower than 0.2ms·cm -1 ;

[0040] Step S1.4, drying the manganese dioxide mineral, grinding and sieving to obtain nano manganese dioxide.

[0041] The embodiment of the present invention also...

Embodiment 1

[0058] Preparation of nano manganese dioxide: accurately weigh 81.12g manganese sulfate (MnSO 4 ·H 2 O) Transfer the solid to a 1000mL beaker, add ultrapure water to 300mL, then heat in a water bath to 90°C, and keep stirring until the manganese sulfate solid is completely dissolved to obtain a molar concentration of 1.6mol L -1 manganese sulfate aqueous solution; 60 ℃ potassium permanganate aqueous solution (volume is 400mL, molar concentration is 0.8mol L -1 ) was slowly added into the manganese sulfate aqueous solution at a temperature of 90°C with a separatory funnel, and stirred continuously with a glass rod while adding, until the reaction solution returned to 90°C, and kept at this temperature for about 30 minutes. In order to remove excess potassium permanganate, first pour off the supernatant that has been left to stand for stratification, then wash the precipitate with ultra-pure water at 60°C, repeatedly stir, let stand, and pour off the supernatant until the super...

Embodiment 2

[0063] The difference between embodiment 2 and embodiment 1 is only: sodium bisulfite is not added in the methyl parathion solution; all the other are then substantially the same as embodiment 1.

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Abstract

The invention provides a manganese dioxide and sulfite system. The manganese dioxide and sulfite system comprises nano manganese dioxide and sulfite, and the mass ratio of the sulfite to the nano manganese dioxide is 0.25: 1-10: 1. The invention further provides a preparation method of the manganese dioxide and sulfite system. The preparation method comprises the following steps: preparing the nano manganese dioxide; and mixing the sulfite with the nano manganese dioxide according to the mass ratio of 0.25: 1-10: 1 to obtain the manganese dioxide and sulfite system. By the provided manganese dioxide and sulfite system, organic pollutants in soil and polluted water can be removed. By the provided manganese dioxide and sulfite system, hydrolysis and oxidative degradation rate of organophosphorus pesticide in the water is increased effectively, a purpose of efficiently removing the organophosphorus pesticide in the water is achieved, and the degradation rate of parathion-methyl within 30h reaches 97.1%.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a system of manganese dioxide and sulfite and its preparation method and application. Background technique [0002] MnO 2 It is the most common manganese-containing mineral that exists stably in soil and sediment. It is a very active component in soil. It can strongly adsorb many ions and easily participate in redox reactions, thus becoming a degraded quinone, phenol, dye, etc. One of the most effective transition metal oxides for organic pollutants has been widely used in wastewater treatment and groundwater remediation. However, there are some restrictive factors in this method, especially the poor affinity for organic pollutants with less hydroxyl structure (such as organophosphorus pesticides), insufficient contact with manganese dioxide, dark and neutral underground environments and other factors make the degradation efficiency not high. The application of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/28C02F1/72C02F1/00B01J20/06B01J23/32B01J20/30B09C1/08C02F101/30
CPCB01J20/06B01J23/32B01J2220/4806B09C1/08B09C2101/00C02F1/00C02F1/281C02F1/725C02F2101/306
Inventor 张彩香王建伟廖小平汤蜜王焰新
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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