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CN-121972176-A - Bi25-xErxFeO40Piezoelectric crystal, preparation method thereof and application thereof in catalytic degradation of organic pollutants

CN121972176ACN 121972176 ACN121972176 ACN 121972176ACN-121972176-A

Abstract

The invention provides a Bi 25‑x Er x FeO 40 piezoelectric crystal, a preparation method thereof and application thereof in catalytic degradation of organic pollutants, wherein the Bi 25‑x Er x FeO 40 piezoelectric crystal is in a cubic crystal system, and a space group is 123, wherein x=0.188-0.340. The Bi 25‑x Er x FeO 40 piezoelectric crystal can realize piezoelectric degradation of pollutants under stirring and dark conditions or under stirring and illumination conditions, and can restore the piezoelectric catalytic degradation capability under the dark and stirring conditions.

Inventors

  • TAN GUOQIANG
  • LIU WENLONG
  • WU XIONGTAO
  • GUO LINXIN
  • FAN SIZHE
  • YANG DI
  • ZHANG XIXI
  • XIE MINGLUN
  • PENG XIAOYI
  • Xia ao

Assignees

  • 陕西科技大学

Dates

Publication Date
20260505
Application Date
20260228

Claims (10)

  1. 1. The Bi 25-x Er x FeO 40 piezoelectric crystal is characterized in that the Bi 25-x Er x FeO 40 piezoelectric crystal is a cubic crystal system, and the space group is 123, wherein x=0.188-0.340.
  2. 2. The method of preparing a Bi 25-x Er x FeO 40 piezoelectric crystal according to claim 1, comprising: Step 1, bi (NO 3 ) 3 ·5H 2 O、Er(NO 3 ) 3 ·5H 2 O and Fe (NO 3 ) 3 ·9H 2 O are dissolved in ethylene glycol, followed by adding water to obtain a mixed solution; Step 2, adding NH 3 ·H 2 O into the mixed solution under the stirring condition, adjusting the pH value to 9-11 to generate a precipitate, and washing and drying the precipitate in sequence; And step 3, mixing the dried precipitate with NaOH solution to obtain a precursor solution, performing hydrothermal reaction on the precursor solution, and washing and drying the obtained product to obtain the Bi 25-x Er x FeO 40 piezoelectric crystal.
  3. 3. The method of producing a Bi 25-x Er x FeO 40 piezoelectric crystal according to claim 2, wherein in step 1, bi (molar ratio of NO 3 ) 3 ·5H 2 O、Er(NO 3 ) 3 ·5H 2 O to Fe (NO 3 ) 3 ·9H 2 O) is (1~y) y:1, y=0.07 to 0.12.
  4. 4. The method for producing a Bi 25-x Er x FeO 40 piezoelectric crystal according to claim 2, wherein in step 1, the volume ratio of ethylene glycol to water is 50 (50 to 80).
  5. 5. The method for preparing a Bi 25-x Er x FeO 40 piezoelectric crystal according to claim 2, wherein in step 2, the stirring time is 100 to 120 min.
  6. 6. The method for preparing a Bi 25-x Er x FeO 40 piezoelectric crystal according to claim 2, wherein in step 3, the hydrothermal reaction temperature is 165 to 200 ℃ and the hydrothermal reaction time is 30 to 48 hours.
  7. 7. Use of the Bi 25-x Er x FeO 40 piezoelectric crystal of claim 1 for the catalytic degradation of organic contaminants.
  8. 8. The use according to claim 7, wherein the catalytic degradation of organic contaminants is carried out under stirring and dark conditions.
  9. 9. The use according to claim 8, wherein the Bi 25-x Er x FeO 40 piezoelectric crystal is regenerated in darkness and under stirring after several cycles of use, and the regenerated crystal is further used for catalytic degradation of organic pollutants.
  10. 10. The use according to claim 7, wherein the catalytic degradation of organic contaminants is carried out under stirring and light conditions.

Description

Bi 25-xErxFeO40 piezoelectric crystal, preparation method thereof and application thereof in catalytic degradation of organic pollutants Technical Field The invention belongs to the field of piezoelectric functional materials, and relates to an Er doped Bi 25-xErxFeO40 piezoelectric crystal, a preparation method thereof and application thereof in catalytic degradation of organic pollutants. Background Piezoelectric catalysis technology can utilize mechanical energy to drive chemical reaction, and provides a new way for degrading water pollutants. Bi 25FeO40 is formed by interlacing bismuth-rich [ Bi-O ] polyhedral units and Fe-O ligand structures, and the non-centrosymmetric bismuth-rich ore type framework structure of the bismuth-rich polyhedral units has piezoelectric effect, so that the bismuth-rich ore type framework structure is considered as one of piezoelectric catalysts with wide application prospect. However, bi 25FeO40 still faces the problems of low built-in polarized electric field strength, insufficient carrier separation capability, etc., limiting its practical efficiency in contaminant degradation. Disclosure of Invention Aiming at the problems existing in the prior art, the invention provides a Bi 25-xErxFeO40 piezoelectric crystal, a preparation method thereof and application thereof in catalytic degradation of organic pollutants, which can realize piezoelectric degradation of pollutants under stirring and dark conditions or under stirring and illumination conditions and repair the piezoelectric catalytic degradation capability under the dark and stirring conditions. The invention is realized by the following technical scheme: In a first aspect, the present invention provides a Bi 25-xErxFeO40 piezoelectric crystal, where the Bi 25-xErxFeO40 piezoelectric crystal is in a cubic crystal system, and the space group is 123, where x=0.188 to 0.340. In a second aspect, the present invention provides a method for preparing a Bi 25-xErxFeO40 piezoelectric crystal, comprising: Step 1, bi (NO 3)3·5H2O、Er(NO3)3·5H2 O and Fe (NO 3)3·9H2 O are dissolved in ethylene glycol, followed by adding water to obtain a mixed solution; Step 2, adding NH 3·H2 O into the mixed solution under the stirring condition, adjusting the pH value to 9-11 to generate a precipitate, and washing and drying the precipitate in sequence; And step 3, mixing the dried precipitate with NaOH solution to obtain a precursor solution, performing hydrothermal reaction on the precursor solution, and washing and drying the obtained product to obtain the Bi 25-xErxFeO40 piezoelectric crystal. Preferably, in step 1, bi (NO 3)3·5H2O、Er(NO3)3·5H2 O and Fe (NO 3)3·9H2 O) are in a molar ratio of (1~y) y:1, y=0.07 to 0.12. Preferably, in the step 1, the volume ratio of the glycol to the water is 50 (50-80). Preferably, in the step 2, the stirring time is 100-120 min. In the step 2 of the invention, NH 3·H2 O is adopted to adjust the pH value, NH 4+ is easy to clean after washing and drying, and Na +、K+ and Li + are not easy to clean after washing and drying if KOH, naOH, liOH is adopted to adjust the pH value, so that the electronegativity of the precipitate is affected. The Bi (OH) 3、Er(OH)3、Fe (OH)3 precipitate affects the polymerization of the precipitate into a macromolecular network by adsorbing metal ions. Preferably, in the step 3, the hydrothermal reaction temperature is 165-200 ℃ and the hydrothermal reaction time is 30-48 hours. Preferably, in the step 3, washing is specifically carried out by centrifugal washing with deionized water, washing with absolute ethyl alcohol, and repeating for a plurality of times. Preferably, in step 3, the drying is vacuum drying. In a third aspect, the invention provides an application of a Bi 25-xErxFeO40 piezoelectric crystal in catalytic degradation of organic pollutants. Preferably, the catalytic degradation of the organic contaminants is performed under stirring and darkness conditions or under stirring and light conditions. The Bi 25-xErxFeO40 piezoelectric crystal has piezoelectric characteristics, the Er doping breaks the spin balance state of electrons in the Bi 25-xErxFeO40 crystal, spin polarization is generated, and the built-in electric field strength of the Bi 25-xErxFeO40 crystal is enhanced. The Bi 25-xErxFeO40 piezoelectric crystal realizes high-efficiency piezoelectric catalytic degradation of organic pollutants under stirring and dark conditions or under stirring and illumination conditions through the internal electric field strength of the spin polarization enhanced Bi 25-xErxFeO40 crystal, and can repair the piezoelectric catalytic degradation capability under dark and stirring conditions. Preferably, the organic contaminants are tetracycline hydrochloride, ciprofloxacin, and bisphenol a. Compared with the prior art, the invention has the following beneficial effects: According to the invention, er element is doped in the Bi 25FeO40 piezoelectric crystal, the valence distribution of F