A kind of positively charged nanometer yttrium oxide and preparation method thereof

A nano-yttrium oxide, positively charged technology, applied in chemical instruments and methods, nanotechnology, rare earth metal oxides/hydroxides, etc., can solve the limitations of the development and application of charged ceramic films, weak surface electrical properties, base Problems such as weak membrane binding

Active Publication Date: 2017-05-03
SANITARY EQUIP INST ACAD OF MILITARY MEDICAL SCI PLA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, research on inorganic charging agents is rarely reported at home and abroad. At present, most commercial nanometer metal oxides are directly used as inorganic charging agents in the preparation process of positively charged ceramic membranes, such as ZrO 2 , Y 2 o 3 、Al 2 o 3 etc. These commercialized nano-metal oxides have weak surface electrical properties and weak binding force with the base film (Water Res., 2008, 42:1726; J.Eur.Ceram.Soc., 2008,28:1603) , thus limiting the further development and application of charged ceramic membranes

Method used

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  • A kind of positively charged nanometer yttrium oxide and preparation method thereof
  • A kind of positively charged nanometer yttrium oxide and preparation method thereof
  • A kind of positively charged nanometer yttrium oxide and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0026] (1) Add ethanol and deionized water to a stirred reactor at a mass ratio of 1:10, then add yttrium acetate, control the molar concentration of yttrium ions in the solution to 0.2mol / L, and heat it to 70℃. Under stirring conditions, urea with a molar concentration of 0.8 mol / L was slowly added to react for 4 hours to obtain a precursor sol containing yttrium. Then it was transferred to a high-speed centrifuge at 12000r / min for centrifugal sedimentation for 0.5h, the upper solvent was removed, the lower sediment was taken out, washed, and dried in an oven at 120°C for 4h to obtain the yttrium-containing precursor.

[0027] (2) Place the yttrium-containing precursor obtained in step (1) in a tube furnace, under the protection of a nitrogen atmosphere, gradually increase the temperature to 600°C at a heating rate of 2°C / min, and heat it for 1.5h to heat Yttrium precursor is completely converted to inorganic Y 2 O 3 Crystal structure, positively charged nano Y is prepared after...

Embodiment 2

[0031] (1) Add n-propanol and deionized water to a stirred reactor at a mass ratio of 1:5, then add yttrium acetate, control the molar concentration of yttrium ions in the solution to 0.1 mol / L, and heat to 85°C. Under the condition of magnetic stirring, urea with a molar concentration of 0.5 mol / L was slowly added to react for 3 hours to obtain a precursor sol containing yttrium. Then it was transferred to a high-speed centrifuge at 12000r / min for centrifugal sedimentation for 0.5h, the upper solvent was removed, the lower sediment was taken out, washed, and dried in an oven at 100°C for 6h to obtain the yttrium-containing precursor.

[0032] (2) Place the yttrium-containing precursor obtained in step (1) in a tube furnace, under the protection of a nitrogen atmosphere, gradually increase the temperature to 650°C at a heating rate of 1°C / min, heat it for 1.5h, and perform high temperature heat treatment. Positively charged nano Y 2 O 3 .

[0033] Nano Y prepared in Example 2 2 O ...

Embodiment 3

[0035] (1) Add isopropanol and deionized water into a stirred reactor at a mass ratio of 1:5, then add yttrium acetate, control the molar concentration of yttrium ions in the solution to 2mol / L, and heat to 75°C. Under stirring conditions, urea with a molar concentration of 4 mol / L was slowly added to react for 2 hours to obtain a precursor sol containing yttrium. Then it was transferred to a high-speed centrifuge at 12000r / min for centrifugal sedimentation for 0.5h, the upper solvent was removed, the lower sediment was taken out, washed, and dried in an oven at 100°C for 6h to obtain the yttrium-containing precursor.

[0036] (2) Place the yttrium-containing precursor obtained in step (1) in a tube furnace, under the protection of a nitrogen atmosphere, gradually increase the temperature to 550°C at a heating rate of 3°C / min, heat it for 2h, and perform high-temperature heat treatment. Positively charged nano Y 2 O 3 .

[0037] Nano Y prepared in Example 3 2 O 3 It has a body-cen...

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Abstract

The invention discloses positively charged nano yttrium oxide and a preparation method thereof. The isoelectric point of nano Y2O3 with positive charges on the surface is 8-10, the Zeta potential of the surface is 20-30mV when the pH is 7, and the average size of the nano Y2O3 particles is 20-80nm. In the invention, an alcohol-water mixture is used as a reaction solvent, homogeneous nucleation of a yttrium-containing precursor is promoted by use of the solubility difference of the reactant in two solvents, and nano Y2O3 with relatively strong electropositivity and relatively high isoelectric point is obtained through high-temperature thermal decomposition. The method comprises the following specific steps: preparing an alcohol-water mixture according to a certain ratio as a solvent; separately adding a yttrium-containing compound and a precipitator; heating for reacting for homogeneous nucleation to obtain a yttrium-containing precursor; filtering the yttrium-containing precursor, washing and drying; and performing high-temperature thermal decomposition under the protection of a nitrogen atmosphere in a tube furnace to obtain surface positively-charged nano Y2O3. The invention is simple in technology, low in cost and suitable for industrial production.

Description

Technical field [0001] The invention belongs to the technical field of functional nano-inorganic materials, and specifically relates to a nano-inorganic material with a positive charge on the surface and a preparation method thereof. Background technique [0002] The charged ceramic membrane is based on a material with stable physical and chemical properties, and a charged agent is introduced into it to make a functional separation membrane with high selective permeability to the material and liquid. Because there are fixed charges on the surface of the charged ceramic membrane, its separation principle is not only the physical sieving based on the pore size of the neutral membrane, but also has a unique electrostatic adsorption effect. When the oppositely charged substances in the feed liquid pass through the micro When pores, no matter whether the volume of these substances is larger or smaller than the pore size of the membrane, they will be adsorbed to the membrane by the ele...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F17/00B82Y40/00
CPCC01F17/206C01P2002/72C01P2002/82C01P2004/04C01P2004/64C01P2006/40
Inventor 邓橙马军朱孟府陈平田涛张彦军王济虎
Owner SANITARY EQUIP INST ACAD OF MILITARY MEDICAL SCI PLA
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