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A kind of erbium ion doped lanthanum cobaltate photocatalyst powder and its preparation method and application

A technology of photocatalyst, lanthanum cobaltate, which is applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., which can solve the problem of slow photon and hole pair transfer speed, low photocatalytic quantum efficiency, Unfavorable problems such as recovery and separation, to achieve the effect of being suitable for large-scale production, good catalytic performance, and low cost

Active Publication Date: 2019-04-23
东北大学秦皇岛分校
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But TiO 2 It also has its limitations. It has a wide band gap (Eg), can only absorb ultraviolet light with a small wavelength, and has low energy utilization
And powdered TiO 2 In the actual use process, it is not conducive to recovery and separation. The transfer speed of photons and hole pairs is relatively slow and the recombination rate is relatively high, which directly leads to the low photocatalytic quantum efficiency.

Method used

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  • A kind of erbium ion doped lanthanum cobaltate photocatalyst powder and its preparation method and application
  • A kind of erbium ion doped lanthanum cobaltate photocatalyst powder and its preparation method and application
  • A kind of erbium ion doped lanthanum cobaltate photocatalyst powder and its preparation method and application

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Embodiment 1

[0036] Erbium ion doped lanthanum cobaltate photocatalyst, its general formula is: La 1-x Er x CoO 3 , where x=0.03.

[0037] The preparation method of the erbium ion-doped lanthanum cobaltate photocatalyst comprises the following steps: take by weighing 0.97mmol lanthanum carbonate, 1mmol cobalt nitrate and 0.03mmol erbium acetate according to the molar ratio in the general formula, and dissolve them in deionized water (deionized water The volume dosage is 20 times the total molar weight of lanthanum carbonate, cobalt nitrate and erbium acetate), 500r / min magnetic stirring to obtain solution A; -1 Sodium hydroxide solution, adjust pH=8, 500r / min magnetic stirring for 1h to obtain solution B; filter solution B to obtain precipitate C; put precipitate C in an oven and dry at 70°C for 2 h; dry The final precipitate was placed in a muffle furnace, and the temperature in the muffle furnace was raised for 1 hour from room temperature to 700° C., and then kept for 3.5 hours to o...

Embodiment 2

[0039] A kind of erbium ion doped lanthanum cobaltate photocatalyst, its general formula is: La 1-x Er x CoO 3 , where x=0.05.

[0040] The preparation method of the erbium ion-doped lanthanum cobaltate photocatalyst comprises the following steps: take by weighing 0.95mmol lanthanum acetate, 1mmol cobalt carbonate and 0.05mmol erbium nitrate according to the molar ratio in the general formula, and dissolve them in deionized water (deionized water The volume dosage is 25 times the total molar weight of lanthanum carbonate, cobalt nitrate and erbium acetate), 500r / min magnetic stirring to obtain solution A; -1 sodium hydroxide solution, adjust pH=9, 500r / min magnetic stirring for 1.5h to obtain solution B; filter solution B to obtain precipitate C; put precipitate C in an oven, and dry at 80°C for 2.5 h; The dried precipitate was placed in a muffle furnace, and the temperature in the muffle furnace was raised for 1 hour from room temperature to 750° C., and then kept for 3 h...

Embodiment 3

[0042] A kind of erbium ion doped lanthanum cobaltate photocatalyst, its general formula is: La 1-x Er x CoO 3 , where x=0.10.

[0043]The preparation method of the erbium ion-doped lanthanum cobaltate photocatalyst comprises the following steps: take by weighing 1.8mmol lanthanum nitrate, 2mmol cobalt acetate and 0.2mmol erbium carbonate according to the molar ratio in the general formula, and dissolve them in deionized water (deionized water The volume dosage is 30 times the total molar weight of lanthanum carbonate, cobalt nitrate and erbium acetate), 700r / min magnetic stirring to obtain solution A; slowly add the concentration of 1 / 700mol·mL -1 Sodium hydroxide solution, adjust pH=9.5, 700r / min magnetic stirring for 1.5h to obtain solution B; filter solution B to obtain precipitate C; put precipitate C in an oven and dry at 85°C for 2 h; The dried precipitate was placed in a muffle furnace, and the temperature in the muffle furnace was raised for 2.5 hours from room te...

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Abstract

The invention belongs to the field of photocatalytic functional materials, and in particular relates to a lanthanum cobaltate photocatalyst powder doped with erbium ions and a preparation method and application thereof. Erbium ion doped lanthanum cobaltate photocatalyst powder, its general formula is: La 1‑x Er x CoO 3 , where 0≤x≤0.2. The invention provides erbium ion-doped lanthanum cobaltate photocatalyst powder, which is mixed with erbium element with lanthanum cobaltate as a matrix, and the resulting photocatalyst powder has high purity and good catalytic performance; There is a more obvious catalytic effect.

Description

technical field [0001] The invention belongs to the field of photocatalytic functional materials, in particular to a lanthanum cobaltate photocatalyst powder doped with erbium ions and a preparation method and application thereof. Background technique [0002] Water is one of the most important substances for human beings to survive, produce and live. The problems of water quality and water purification directly affect the national economy and the daily production and life of the people. Untreated dye wastewater is directly discharged into rivers, lakes and seas, which will seriously pollute surface water resources and groundwater resources, not only make available water resources less and less, but also cause deformity and death of a large number of aquatic organisms. Therefore, high-tech technologies that can effectively degrade dyes in wastewater should be quickly studied. [0003] Dye wastewater is a kind of industrial wastewater with complex composition, relatively lar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/83C02F1/30
CPCB01J23/002B01J23/83B01J35/004B01J37/088B01J2523/00C02F1/30C02F2305/10B01J2523/3706B01J2523/3775B01J2523/845
Inventor 郭瑞刘宣文刘朝斌张杨肖维城苏娜
Owner 东北大学秦皇岛分校
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