Method for preparing alkaline cobalt carbonate under hyper-gravity hydrothermal condition

A technology of supergravity and cobalt carbonate, applied in the direction of cobalt carbonate and nanotechnology, can solve the problems of structural relaxation and poor uniformity, and achieve the effect of simple equipment and easy control of reaction

Inactive Publication Date: 2011-08-10
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the structural relaxation and poor uniformity of nanostructure materials prepared by traditional methods, the purpose of the present invention is to provide a method for preparing basic cobalt carbonate under high gravity hydrothermal conditions,

Method used

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  • Method for preparing alkaline cobalt carbonate under hyper-gravity hydrothermal condition
  • Method for preparing alkaline cobalt carbonate under hyper-gravity hydrothermal condition
  • Method for preparing alkaline cobalt carbonate under hyper-gravity hydrothermal condition

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Experimental program
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Effect test

Embodiment 1

[0026] figure 1 It is a structural diagram of a high-gravity hydrothermal reaction equipment, wherein: 1. Furnace shell, 2 insulation bricks, 3 heating wires, 4 anti-riot cylinder, 5 autoclave, 6 fixed bracket, 7 cooling water pipe, 8 rotating shaft, 9 motor, 10 wind blade.

[0027] The structure of the equipment includes a centrifugal device, a high-pressure reaction kettle, and a temperature control furnace, wherein the centrifugal device includes a motor and a fixed bracket fixed on the motor shaft; the temperature control furnace includes a temperature controller, an electric heating wire, an insulation material and a furnace shell; the autoclave Including kettle lid, kettle body and PTFE lining. The fixed bracket of the centrifugal device is located in the cavity of the temperature control furnace, and the high-pressure reaction kettle is installed on the fixed bracket of the centrifugal device.

Embodiment 2

[0029] Basic cobalt carbonate (Co 2 (OH) 2 CO 3 ) preparation: its preparation steps are:

[0030] Step 1: Add a certain amount of cobalt chloride to 5 milliliters of deionized water to form a cobalt chloride solution with a concentration of 0.5 mol / l;

[0031] Step 2: Add a certain amount of urea to the solution in step 1, adjust the pH value to dissolve it, and require the molar ratio of cobalt chloride and urea to be 1:5;

[0032] Step 3: Add 2 milliliters of dichlorobenzene to the solution in step 2;

[0033] Step 4: Put the mixed solution in step 3 into the autoclave, seal the autoclave, and fix it on figure 1 on a fixed stand in the hypergravity reaction apparatus shown. Then heat up to 120-150°C, keep warm for half an hour, cool down and cool down, after the reaction, the shape of basic cobalt carbonate obtained is a sheet structure, such as figure 2 .

Embodiment 3

[0035] Basic Cobalt Carbonate (Co(OH) 1.02 (CO 3 ) 0.48 0.29H 2 O) preparation: its preparation steps are:

[0036] Step 1: Add a certain amount of cobalt nitrate to 5 ml of deionized water to prepare a cobalt nitrate solution with a concentration of 0.1mol / l;

[0037] Step 2: Add a certain amount of urea to the solution in step 1, adjust the pH value to dissolve it, and require the molar ratio of cobalt nitrate and urea to be 1:2;

[0038] Step 3: add 2 milliliters of bromobenzene in the solution of step 2;

[0039] Step 4: Put the mixed solution in step 3 into the autoclave, seal the autoclave, and fix it on figure 1 on a fixed stand in the hypergravity reaction apparatus shown. Then heat up to 120-150°C, keep the heat for half an hour, cool down and cool down, and after the reaction, the shape of basic cobalt carbonate obtained is a flower-like structure, such as image 3 .

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Abstract

The invention relates to a method for preparing alkaline cobalt carbonate under hyper-gravity hydrothermal condition. The method comprises the following specific steps of: adding a certain amount of cobalt salt into deionized water to obtain a metal salt solution with the concentration between 0.1 mol/L and 2 mol/L; dissolving a corresponding chemical reagent which can produce CO3<2-> at the reaction temperature between 50 DEG C and 250 DEG C; adding a certain amount of organic solvent which has higher density in comparison with water and is insoluble in water or a water-soluble high molecular compound with density higher than that of water into the prepared solution, wherein the volume ratio of the organic solvent or the water-soluble high molecular compound to an aqueous solution is 1:1-1:100; filling the mixed solution into a reaction kettle, sealing, fixing the reaction kettle on a fixing bracket in a hearth and undergoing a hydrothermal reaction at certain temperature in the presence of hyper-gravity, wherein the reaction temperature is between 50 DEG C and 250 DEG C, the reaction time is between 0.1 hour and 5 hours, and relative centrifugal force is between 500/g and 10,000/g; and filtering, cleaning repeatedly and drying in vacuum to obtain a needed material. By adopting the method, a substrate-free alkaline cobalt carbonate membrane can be directly prepared; and equipment is simple, the reaction is easy to control, and industrialization is easy to realize.

Description

Technical field [0001] The present invention involves the preparation technology of nano -structural materials, and specifically involves the preparation method of alkaline cobalt carbonate under the condition of hyperbenic water and heat.The alkali carbonate cobalt made from this method can be burned at a certain temperature to get a flower -like and chip -shaped CO 3 O 4 It can be used for many high -tech fields such as gas -sensitive materials, ceramics, and catalytic. Background technique [0002] my country's mineral resources are abundant, and alkali carbonate is a main form of existence of mineral resources.In recent years, with the high attention of new energy materials in the world, the rapid development of gas -sensitive materials has been developed rapidly, and the demand for alkaline -type cobalt carbonate and tetraxide cobalt has become increasingly expanded. At the same time, the quality of the above material isIt also puts forward higher requirements.The current co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G51/06B82Y40/00
Inventor 李汶军方璐
Owner TONGJI UNIV
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