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Regulating method of nano layered MgFe hydrotalcite grain growth process

A technology of grain growth and nano-layering, applied in nanotechnology, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of large hydrotalcite crystal particle size and ineffective control of crystal size, so as to inhibit aggregation growth and control The effect of preparation costs

Inactive Publication Date: 2018-04-06
NORTHEAST GASOLINEEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] An object of the present invention is to provide a method for regulating and controlling the growth process of nano-layered MgFe hydrotalcite grains, and the method for regulating and controlling the growth process of nano-layered MgFe hydrotalcite grains is used to solve the problem that the current hydrotalcite crystal particle size is relatively large. Problems such as crystal size cannot be effectively controlled

Method used

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  • Regulating method of nano layered MgFe hydrotalcite grain growth process
  • Regulating method of nano layered MgFe hydrotalcite grain growth process
  • Regulating method of nano layered MgFe hydrotalcite grain growth process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The control method of the growth process of MgFe hydrotalcite synthesized only by segmental crystallization method:

[0027] Prepare 0.4mol / L of Mg(NO 3 ) 2 and 0.1mol / L Fe(NO 3 ) 3 25mL each and mix well, where M 2+ :M 3 + (Mg:Fe)=4:1 (molar ratio), stir the above mixed metal nitrate solution evenly. Adopt the NaOH solution of deionized water preparation 3mol / L as precipitating agent, and add the NaOH solution of 3mol / L dropwise to above-mentioned mixed metal nitrate solution, precipitation occurs in the mixed solution, stop dripping when the pH value of the solution=10, Stir and mix evenly, transfer the mixed solution to a polytetrafluoroethylene-lined stainless steel reactor, crystallize at 180°C for 1 hour, and then continue to crystallize at 100°C for 24 hours. After crystallization, the product in the reactor was taken out, centrifuged and washed until the filtrate pH=7, and dried at 80°C for 24 hours to obtain a hydrotalcite product.

[0028] From figure...

Embodiment 2

[0030] The regulation method of the growth process of synthetic MgFe hydrotalcite only by adding organic steric hindrance agent:

[0031] A 3 mol / L NaOH solution was prepared with deionized water as a precipitant. At the same time, 0.4mol / L of Mg(NO 3 ) 2 and 0.1mol / L Fe(NO 3 ) 3 25mL each and mix well, where M 2+ :M 3+ (Mg:Fe)=4:1 (molar ratio). Stir the above mixed metal nitrate solution evenly, and add 3mol / L NaOH solution dropwise to it, precipitation appears in the mixed solution, stop the dropwise addition when the pH value of the solution=10, and then add triethanolamine with 5% of the total mass of the solution , stirred and mixed evenly, the mixed solution was transferred to a polytetrafluoroethylene-lined stainless steel reactor, and crystallized at 180° C. for 24 hours. After crystallization, the product in the reactor was taken out, centrifuged and washed until the filtrate pH=7, and dried at 80°C for 24 hours to obtain a hydrotalcite product.

[0032] From...

Embodiment 3

[0034] The control method of the nano-layered MgFe hydrotalcite grain growth process of the present invention:

[0035] Prepare 0.4mol / L of Mg(NO 3 ) 2 and 0.1mol / L Fe(NO 3 ) 3 25mL each and mix well, where M 2+ :M 3 + (Mg:Fe)=4:1 (molar ratio), stir the above mixed metal nitrate solution evenly. Adopt the NaOH solution of deionized water preparation 3mol / L as precipitating agent, dropwise add the NaOH solution of 3mol / L in the above-mentioned mixed metal nitrate solution, precipitation occurs in the mixed solution, stop dripping when the pH value of the solution=10, Then add triethanolamine with 5% of the total mass of the solution, stir and mix evenly, transfer the mixed solution to a polytetrafluoroethylene-lined stainless steel reactor, react at 180°C for 2h, and continue crystallization at 100°C for 24h . After the crystallization, the solid product in the reactor was taken out, centrifuged and washed until the filtrate pH=7, and dried at 80°C for 24 hours to obta...

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Abstract

The invention relates to a regulating method of a nano layered MgFe hydrotalcite grain growth process. The regulating method of the nano layered MgFe hydrotalcite grain growth process comprises the steps as follows: (1) an Mg(NO3)2 solution and a Fe(NO3)3 solution are prepared and uniformly mixed, so that the molar ratio of Mg to Fe in the solution is (1:10)-(10:1); (2) a NaOH precipitant is dropwise added to the prepared solution in step (1), and the solution is continuously stirred, so that the pH of the solution is 8-12; (3) crystallization is performed at 40-220 DEG C for 0.5-6 h, crystallization is continuously performed at 70-120 DEG C for 12-36 h, the addition quantity of organic steric hindrance agents in a hydrothermal synthesis system is 0.1%-20.0% of the total mass of the solution, a solid product is obtained through separation after the reaction, washed and separated, the obtained solid product is dried, and nano layered MgFe hydrotalcite can be obtained. The nano MgFe hydrotalcite with the narrower crystal size distribution range can be prepared.

Description

technical field [0001] The invention relates to a method for regulating the grain growth process of hydrotalcite, in particular to a method for regulating the grain growth process of nano-layered MgFe hydrotalcite. Background technique [0002] Hydrotalcite and hydrotalcite-like compounds, also known as layered double hydroxides (LDHs), are anionic compounds with a layered structure. Hydrotalcite crystals are hexagonal, and its structure is similar to brucite Mg(OH) 2 , the structural unit of brucite is MgO 6 octahedral, where the oxygen is OH - form exists. Hydrotalcite can be seen as the 2+ Al similar 3+ Substituting it into the derivatives of brucite formed in the octahedral structure, due to Al 3+ In order to balance the excess charge on the laminate, the anion enters the hydrotalcite layer, making the hydrotalcite system electrically neutral. Hydrotalcite is a class of tunable inorganic functional materials, and laminate cations can be combined with Mg 2+ Ions w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/00B82Y40/00
Inventor 陈彦广薛峰韩洪晶宋华张娇静张志秋张永军苑慧敏
Owner NORTHEAST GASOLINEEUM UNIV
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