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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 catalysts also has some problems, such as insufficient utilization of active sites, aggregation of nanoparticles, and high dissolution of metal ions.

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

Embodiment 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 uniformly dissolved; measure 2.3718g of NH 4 HCO 3 , adding the above mixed solution at room temperature to adjust the pH of the solution. After the obtained mixed solution was fully stirred 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 centrifuging, a solid precursor was obtained. After washing the obtained precursor, it was transferred to an oven and dried at 60-70° C. for 12 hours. The dried precursor was transferred to a muffle furnace, and it was calcined with a calcination procedure of raising the temperature at 5°C / min to 600°C for 5h, and finally obtained the gray-green (CoMn)(CoMn) 2 o 4 spinel oxide.

[00...

Embodiment 2

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

[0035] Test 1: Take 200mL of Orange 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, and add 0.42g / L Bicarbonate, react at room temperature for 60min.

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

[0037] Such as 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 minutes of reaction, the degradation efficiency of Orange II reached 96.6%.

[0038] Such as Figure 4 Shown is the cycle efficiency diagram of cobalt...

Embodiment 3

[0043] The cobalt-manganese spinel material / peroxymonosulfate / bicarbonate system was applied to the research of treating 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, and add 0.42g / L Bicarbonate, reacted at room temperature for 60min.

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

[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, and add 0.42g / L Bicarbonate, reacted at room temperature for 60min.

[0047] Test 5: Take 200mL of phenol...

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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
CPCB01J23/8892B01J23/005C02F1/725C02F2101/30Y02W10/37
Inventor 蔡纯张瑾许蕊康淑萍
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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