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Method for preparing cerium dioxide having different morphologies through hydrothermal technology

A technology of cerium dioxide and hydrothermal method, which is applied in the fields of chemical instruments and methods, rare earth metal oxides/hydroxides, inorganic chemistry, etc., and can solve the problem of low intensity of electrochemiluminescence

Inactive Publication Date: 2018-03-02
NORTHWEST NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of low electrochemiluminescence intensity of ceria, and provide a preparation method of ceria with different shapes by hydrothermal method, so as to enhance the electrochemiluminescence intensity of ceria, and then improve its construction. Sensitivity of the sensor

Method used

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  • Method for preparing cerium dioxide having different morphologies through hydrothermal technology
  • Method for preparing cerium dioxide having different morphologies through hydrothermal technology
  • Method for preparing cerium dioxide having different morphologies through hydrothermal technology

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Effect test

Embodiment 1

[0026] Embodiment 1, cubic CeO 2 preparation of

[0027] Weigh 1.736 g Ce(NO 3 ) 3 . 6H 2O was dispersed in 10 mL of ultrapure water, mixed with 70 mL of 10 mol / L NaOH solution, and stirred at room temperature for 30 min to form an emulsion; then placed in a reactor, hydrothermally reacted at 180 °C for 24 h, Centrifuge, wash with ultrapure water and ethanol three times in sequence, and dry in an oven at 70 °C for 24 h to obtain the blocky pre-product CeO 2 ; Put it into the muffle furnace after grinding, at 300 + Calcined at 5 °C for 1 h to obtain cubic CeO 2 , whose structure see figure 1 A, its crystal plane is {100}.

[0028] Measure its electrochemiluminescence intensity: 2500 A.U.

Embodiment 2

[0029] Embodiment 2, nanorod type CeO 2 preparation of

[0030] Weigh 1.736 g Ce(NO 3 ) 3 . 6H 2 O was dispersed in 10 mL of ultrapure water, mixed with 70 mL of 10 mol / L NaOH solution, stirred at room temperature for 30 min to form an emulsion; Centrifuge, wash with ultrapure water and ethanol three times in sequence, and place in an oven at 70 °C for 24 h to obtain the blocky pre-product CeO 2 ; After grinding, put it into the muffle furnace, at 300 + Calcined at 5°C for 1 h to obtain rod-shaped CeO 2 , whose structure see figure 1 C, whose crystal faces are {110} and {100}.

[0031] Measure its electrochemiluminescent intensity: 150 A.U.

Embodiment 3

[0032] Embodiment 3, nano particle type CeO 2 preparation of

[0033] Weigh 1.736 g Ce(NO 3 ) 3 . 6H 2 O was dispersed in 10 mL of ultrapure water, mixed with 70 mL of 10 mol / L NaOH solution, and stirred at room temperature for 30 min to form an emulsion; then placed in a reactor, hydrothermally reacted at 180 °C for 24 h, centrifuged, washed three times with ultrapure water and ethanol in sequence, and dried in an oven at 70 °C for 24 h to obtain the blocky pre-product CeO 2 ; After grinding, put it into the muffle furnace, at 800 + Calcined at 5°C for 1 h to obtain nanoparticle-type CeO 2 , whose structure see figure 1 B, its crystal plane is {111}.

[0034] Measure its electrochemiluminescence intensity: 180 A.U.

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Abstract

The invention discloses a method for preparing cerium dioxide having different morphologies. The method comprises the following steps: dispersing Ce(NO3)3.6H2O in a NaOH solution, carrying out a hydrothermal reaction at different temperatures, washing the obtained reaction product, drying the washed reaction product, and calcining the dried reaction product at a high temperature to obtain the cerium dioxide having different morphologies. Electrochemiluminescence performance studies show that the cerium oxide has different oxidabilities and different oxygen vacancies due to different structuresand different oxygen exposure ways, the electrochemiluminescence performance of the cerium oxide has no close relationship with the oxidability, but is related to the oxygen vacancies, and the smallcontent of the oxygen vacancies facilitates the electrochemiluminescence reaction. The cubic cerium dioxide has a strong and stable electrochemiluminescence signal, and has a strongest electrochemiluminescence intensity, so the cubic cerium dioxide can be used to construct an electrochemiluminescence sensor, and the sensor has the characteristics of fast analysis speed and high sensitivity when used to detect heavy metal ions, biological micro-molecules, tumor markers and the like.

Description

technical field [0001] The present invention relates to a method for preparing ceria, in particular to a method for preparing ceria with different shapes by hydrothermal method; the present invention also studies the electrochemiluminescent properties of ceria with different shapes, mainly as an electrochemiluminescent Chemiluminescent sensors are used in the detection of heavy metal ions, small biological molecules, tumor markers, etc. Background technique [0002] As a rare earth oxide material, ceria has good catalytic performance, good biocompatibility, chemical stability and adsorption capacity for macromolecules. It has been reported in the literature that cerium dioxide has the performance of electrochemiluminescence, and the electrochemiluminescence sensor constructed with it is used to detect heavy metal ions, small biological molecules, tumor markers, etc., and has the advantages of simple equipment, fast analysis speed, high sensitivity, It has the advantages of ...

Claims

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Application Information

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IPC IPC(8): C01F17/00B82Y40/00
CPCB82Y40/00C01F17/206C01P2002/72C01P2002/82C01P2004/04C01P2004/16C01P2004/38
Inventor 王志华钱亚眩黄亚辉魏小龙张亚芳李林芳卢小泉
Owner NORTHWEST NORMAL UNIVERSITY
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