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Positively charged nano 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. Membrane development and application issues

Active Publication Date: 2016-08-17
SANITARY EQUIP INST ACAD OF MILITARY MEDICAL SCI PLA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Positively charged nano yttrium oxide and preparation method thereof
  • Positively charged nano yttrium oxide and preparation method thereof
  • Positively charged nano yttrium oxide and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0027] (2) Place the yttrium-containing precursor obtained in step (1) in a tube furnace, and under the protection of a nitrogen atmosphere, gradually raise the temperature to 600°C at a heating rate of 2°C / min, and conduct a high-temperature heat treatment at a temperature of 1.5 hours to make the yttrium-containing precursor Yttrium precursors are fully ...

Embodiment 2

[0031] (1) Add n-propanol 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 0.1mol / L, heat to 85°C, and Under the condition of magnetic stirring, urea with a molar concentration of 0.5 mol / L was slowly added and reacted for 3 hours to obtain a yttrium-containing precursor sol. Then it was transferred to a high-speed centrifuge at 12000r / min for centrifugal sedimentation for 0.5h to remove the upper solvent, and the lower precipitate was taken out, washed and dried in an oven at 100°C for 6h to obtain a yttrium-containing precursor.

[0032] (2) Place the yttrium-containing precursor obtained in step (1) in a tube furnace, and gradually raise the temperature to 650°C at a rate of 1°C / min under the protection of a nitrogen atmosphere, and keep it warm for 1.5h for high-temperature heat treatment. After cooling positively charged nanometer Y 2 o 3 .

[0033] The nanome...

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, heat to 75°C, and Under stirring conditions, urea with a molar concentration of 4 mol / L was slowly added to react for 2 hours to obtain a yttrium-containing precursor sol. Then it was transferred to a high-speed centrifuge at 12000r / min for centrifugal sedimentation for 0.5h to remove the upper solvent, and the lower precipitate was taken out, washed and dried in an oven at 100°C for 6h to obtain a yttrium-containing precursor.

[0036] (2) Place the yttrium-containing precursor obtained in step (1) in a tube furnace, and under the protection of a nitrogen atmosphere, gradually raise the temperature to 550°C at a heating rate of 3°C / min, keep it warm for 2 hours for high-temperature heat treatment, and immediately after cooling positively charged nanometer Y 2 o 3 .

[0037] The nan...

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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 in particular 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 charging agent is introduced into it to make a functional separation membrane with high selective permeability to the feed liquid. Due to the fixed charge on the surface of the charged ceramic membrane, the separation principle is not only the physical sieving based on the pore size of the neutral membrane, but also the unique electrostatic adsorption. 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 electrostatic attraction between positive and negative charges (Water Res., 2008, 42:1726; J.Eur.Ceram.Soc ., 200...

Claims

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Application Information

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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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