Cobalt-manganese spinel material as well as preparation method and application thereof

A technology of cobalt-manganese spinel and cobalt acetate, which is applied in chemical instruments and methods, water/sludge/sewage treatment, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of poor catalytic performance and nano-particles Aggregate the problems of high dissolution of metal ions and insufficient utilization of active sites to achieve low production costs, broad economic benefits and application prospects, and low application technology costs

Pending Publication Date: 2022-01-04
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the catalytic performance of heterogeneous Co-based compounds is still inferior to that of Co 2+ , and the application of cobalt-based ca

Method used

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  • Cobalt-manganese spinel material as well as preparation method and application thereof
  • Cobalt-manganese spinel material as well as preparation method and application thereof
  • Cobalt-manganese spinel material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0028] Example 1

[0029] Preparation of cobalt manganese spinel material:

[0030] Measure 0.2491g of Co(OAc) 2 ·4H 2 O and 0.4902g of Mn(OAc) 2 ·4H 2 O, dissolved in 40mL of ethylene glycol at room temperature, mixed and stirred until the dissolution was uniform; Measure 2.3718g of NH 4 HCO 3 , add the above mixed solution at room temperature to adjust the pH of the solution. After fully stirring the obtained mixed solution for 30 min, it was transferred to a Teflon-lined stainless steel autoclave with a capacity of 50 mL, and the hydrothermal reaction was carried out at 200 ° C for 20 hours. After cooling and centrifugation, a solid precursor was obtained. After washing the obtained precursor, it was transferred to an oven and dried at 60-70 °C for 12 h. The dried precursor was transferred to a muffle furnace, and calcined with a calcination procedure of 5 °C / min heating to 600 °C and holding for 5 h, finally obtaining a gray-green (CoMn)(CoMn) 2 O 4 Spinel oxide. ...

Example Embodiment

[0033] Example 2

[0034] The cobalt-manganese spinel material prepared in Example 1 was applied to the research of removing orange yellow II (AO7).

[0035] Test 1: Take 200mL of orange-yellow II solution with a concentration of 0.070g / L, add cobalt manganese spinel material in an amount of 0.25g / L, add peroxymonosulfate in an amount of 0.5g / L, add 0.42g / L of Bicarbonate, reacted at room temperature for 60min.

[0036] Comparative test 1: Take 200 mL of orange-yellow II solution with a concentration of 0.070 g / L, add peroxymonosulfate in an amount of 0.5 g / L, add 0.42 g / L bicarbonate, and react at room temperature for 60 min.

[0037] like image 3 As shown, from the degradation trend of orange II in the cobalt manganese spinel material / peroxymonosulfate / bicarbonate system, it can be seen that the system has a good removal effect on orange II. After 60 min of reaction, orange-yellow II achieved a degradation efficiency of 96.6%.

[0038] like Figure 4 Shown is the cycle...

Example Embodiment

[0042] Example 3

[0043] The cobalt manganese spinel material / peroxymonosulfate / bicarbonate system was applied in the study of treatment of different organic pollutants.

[0044] Test 2: Take 200mL of methyl orange solution with a concentration of 0.065g / L, add cobalt manganese spinel material in an amount of 0.25g / L, add peroxymonosulfate in an amount of 0.5g / L, add 0.42g / L The bicarbonate was reacted at room temperature for 60 min.

[0045] Test 3: Take 200 mL of Rhodamine B solution with a concentration of 0.096 g / L, add cobalt manganese spinel material in an amount of 0.25 g / L, add peroxymonosulfate in an amount of 0.5 g / L, and add 0.42 g / L The bicarbonate was reacted at room temperature for 60 min.

[0046] Test 4: Take 200mL of reactive brilliant blue solution with a concentration of 0.125g / L, add cobalt manganese spinel material in an amount of 0.25g / L, add peroxymonosulfate in an amount of 0.5g / L, add 0.42g / L The bicarbonate was reacted at room temperature for 60 m...

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Abstract

The invention provides a cobalt-manganese spinel material and a preparation method and application thereof, wherein the cobalt-manganese spinel material is prepared by a hydrothermal method and has good catalytic performance. The material is applied to treatment of organic pollutants in wastewater, is used as a catalyst, is combined with bicarbonate to activate persulfate, can quickly and continuously generate sulfate free radicals and singlet oxygen, and can quickly decompose various refractory organic matters. In the reaction process, cobalt and manganese elements in the material form a cycle of low-valence elements and high-valence elements, namely a double-cycle reaction of Co (II)/Co (III) and Mn (II)/Mn (III)/Mn (IV), so that the catalytic activation reaction is continuously carried out. The preparation method provided by the invention is simple in process, low in production cost and suitable for large-scale production; and the material has the advantages of low application technology cost, no pollution and high degradation efficiency, can be recycled for multiple times, and has wide economic benefits and application prospects in the field of remediation of water bodies polluted by refractory organic pollutants.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a cobalt-manganese spinel material and a preparation method and application thereof. Background technique [0002] As the main component of water pollution, organic wastewater is mainly composed of organic dyes and auxiliaries, which are usually difficult to degrade and are easily converted into more toxic intermediates during the degradation process. More effective, faster and safer methods have been developed to deal with these emerging persistent organic pollutants. Sulfate radical-based advanced oxidation processes (SR-AOPs) have attracted extensive attention due to their highly efficient degradation capabilities. Sulfate (SO 4 ·- ) has long half-life (30-40μs), strong oxidation ability (E 0 =2.5-3.1V / NHE), wide pH range and other significant advantages. However, persulfates need to be catalytically activated by methods such as thermal activation, alkaline activ...

Claims

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Application Information

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IPC IPC(8): B01J23/889C02F1/72C02F101/30
CPCB01J23/8892B01J23/005C02F1/725C02F2101/30
Inventor 蔡纯张瑾许蕊康淑萍
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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