Method for degrading organic waste water by activating persulfate through manganese-cobalt composite oxide

A technology for activating persulfate and composite oxides, applied in the field of water treatment, can solve problems such as the application of organic wastewater that has not yet been invented, achieve high utilization rate, good removal effect, and reduce secondary pollution

Inactive Publication Date: 2015-11-25
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, there is no invention related to the application of mangane

Method used

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  • Method for degrading organic waste water by activating persulfate through manganese-cobalt composite oxide
  • Method for degrading organic waste water by activating persulfate through manganese-cobalt composite oxide

Examples

Experimental program
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Effect test

preparation example Construction

[0028] A typical method for preparing manganese oxides is:

[0029] (I) Take a certain amount of KMnO 4 and MnSO 4 (molar ratio 8: 3) was dissolved in water, and after stirring for one hour, the mixed solution was transferred to an autoclave, and heat treated at 160° C. for 12 hours;

[0030] (II) 2mmol of KMnO 4 Dissolve in deionized water, add concentrated sulfuric acid dropwise while stirring, put a 2cm×8cm copper plate, and heat in a water bath at 60°C for 8 hours;

[0031] (III) Take 4mmol of KMnO 4 Dissolved in deionized water and stirred, to KMnO4 A certain amount of glucose, ethylenediamine, and 1.4 mL of concentrated HCl solution were added to the solution, and the mixed solution was transferred to an autoclave for heat treatment at 120° C. for 12 hours.

[0032] Take samples I, II, and III respectively, filter them, wash them three times with deionized water, then wash them twice with absolute ethanol, dry them at 60°C for 24 hours, and calcinate the samples in a...

Embodiment 1

[0037] Example 1 Manganese-cobalt composite oxide activates persulfate to degrade printing and dyeing wastewater.

[0038] Take 500mL of the untreated water sample containing printing and dyeing wastewater, and the pH value is 7.0. Manganese-cobalt composite oxide (MnO 2 -CoO) 0.1g / L (of which, MnO 2 -CoO is prepared according to the steps of the hydrothermal method (I), and in the preparation of MnO 2 CoO particles were added during the process), persulfate 0.5mM, and the water sample was treated for 75min. Compared with the single persulfate oxidation method, the removal rate increased from 1% to 75%.

[0039] figure 1 It is the effect diagram of the removal of refractory organic matter in printing and dyeing wastewater in this example. The refractory organic matter is taken as orange G (OG). Indicates MnO 2 -CoO-activated persulfate oxidative degradation of organic wastewater removal rate curve.

Embodiment 2

[0041] Take 500mL of the untreated water sample containing printing and dyeing wastewater, and the pH value is 7.0. Manganese-cobalt composite oxide (MnO 2 -Co 3 o 4 )2.0g / L (of which, MnO 2 -Co 3 o 4 The preparation is carried out according to the steps in the hydrothermal method (II), in the preparation of MnO 2 In the process of joining Co 3 o 4 Particles) persulfate 5mM, treatment of water samples for 75min, compared with single persulfate oxidation, the removal rate increased from 1% to 95%.

[0042] figure 2 It is the effect diagram of the removal of refractory organic matter in printing and dyeing wastewater in this example. The refractory organic matter is taken as orange G (OG). Indicates MnO 2 -Co 3 o 4 The removal rate curve of activated persulfate oxidative degradation of organic wastewater.

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Abstract

The invention discloses a method for degrading organic waste water by activating persulfate through manganese-cobalt composite oxide. The method includes the following steps that under the normal temperature condition, the persulfate with the concentration of 0.5-5.0 mM and the manganese-cobalt composite oxide with the concentration of 0.1-2.0 g/L are added into the waste water containing organic pollutants, the water sample is treated for 20 min-3 h, then solid-liquid separation is carried out, and the treatment process is completed. The heterogeneous manganese-cobalt oxide is adopted as a catalyst and can efficiently and continuously activate the persulfate to generate sulfate free radicals and hydroxyl free radicals to degrade the organic pollutants. Serving as an environment-friendly material, the manganese oxide can effectively reduce leakage of cobalt ions and reduce secondary pollution and biotoxicity. The method is suitable for treatment on various kinds of organic waste water, high in efficiency and persistence, capable of being used repeatedly and convenient to operate and provides wide prospects for treatment on the degradation-resistant organic waste water.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a method for manganese-cobalt composite oxide to activate persulfate to degrade organic wastewater. Background technique [0002] In recent years, the advanced oxidation technology based on sulfate radical has attracted more and more attention. Due to its high efficiency and high selectivity for the removal of refractory organic pollutants, it has developed into a new technology for the treatment of refractory organic wastewater. Compared with the hydroxyl radical (redox potential 1.8-2.7v) widely used in traditional advanced oxidation technology, the sulfate radical has a higher redox potential (2.5-3.1). Compared with hydroxyl radicals, sulfate radicals have a better degradation effect on pollutants in a wider pH range. The persulfate advanced oxidation technology has the advantages of good stability of the oxidizing agent itself, strong oxidizing ability o...

Claims

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Application Information

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IPC IPC(8): C02F1/72
Inventor 张静翁晟琳
Owner HOHAI UNIV
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