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Preparation method and photocatalysis effect of La0.7Sr0.3MnO3/alpha-Fe2O3

A -fe2o3, accurate technology, applied in the field of preparation of La0.7Sr0.3MnO3/α-Fe2O3 and its photocatalysis, can solve the problems of unsatisfactory photocatalysis effect, high recombination rate of photogenerated electrons and holes, and difficulty in recycling

Active Publication Date: 2020-09-15
ZHONGBEI UNIV
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  • Application Information

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Problems solved by technology

However, for a single photocatalyst, due to the high recombination rate of photogenerated electrons and holes, the photocatalytic effect is not ideal, and the suspended micro-nano catalyst powder is easy to agglomerate, difficult to recycle, and will cause secondary pollution to the environment

Method used

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  • Preparation method and photocatalysis effect of La0.7Sr0.3MnO3/alpha-Fe2O3
  • Preparation method and photocatalysis effect of La0.7Sr0.3MnO3/alpha-Fe2O3
  • Preparation method and photocatalysis effect of La0.7Sr0.3MnO3/alpha-Fe2O3

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Embodiment Construction

[0021] The present invention is realized through the following examples, but the conditions and results described in the implementation do not limit the content and rights of the invention.

[0022] 1. p-n heterojunction magnetic composite oxide La 0.7 Sr 0.3 MnO 3 / α-Fe 2 o 3 preparation

[0023] 1.1 La 0.7 Sr 0.3 MnO 3-δ Preparation: Accurately weigh lanthanum acetate, strontium acetate, and manganese acetate so that the molar ratio is 0.7:0.3:1, dissolve the weighed reactants in water five times the amount, and after complete dissolution, hydrolyze at 80°C , as the solvent water evaporates to a paste, add absolute ethanol to dehydrate and evaporate to dryness, then place it in a muffle furnace, gradually heat it up to 800°C and calcined for 1.5h to obtain La 0.7 Sr 0.3 MnO 3-δ Powder;

[0024] 1.2 p-n heterojunction La 0.7 Sr 0.3 MnO 3 / α-Fe 2 o 3 Preparation: Take 2.0 mmol of Fe(NO 3 ) 3 .9H 2 O was dissolved in 20.0ml of absolute ethanol to obtain ferri...

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Abstract

The invention provides a magnetic composite oxide La0.7Sr0.3MnO3 / alpha-Fe2O3. Technologies such as fluorescence spectroscopy, ultraviolet-visible diffuse reflection spectrum, X-ray diffraction and thelike are used for characterization, and results show that the magnetic composite oxide La0.7Sr0.3MnO3 / alpha-Fe2O3 has obvious absorption under ultraviolet light and visible light and shows good photocatalytic performance under sunlight, and the magnetic composite oxide can enable the degradation rate of simulated methyl orange wastewater to reach 90% under appropriate conditions; after coking wastewater subjected to biochemical treatment is subjected to sunlight photocatalysis for 2 hours, the biodegradability of the coking wastewater is improved, and after the coking wastewater is continuously subjected to biological treatment, the national coking wastewater discharge standard is reached; and the magnetic composite oxide La0.7Sr0.3MnO3 / alpha-Fe2O3 is an efficient magnetic photocatalyst driven by sunlight and has a wide application prospect in the aspect of organic wastewater treatment.

Description

technical field [0001] The invention relates to a p-n heterojunction magnetic composite oxide La 0.7 Sr 0.3 MnO 3 / α-Fe 2 o 3 preparation and its photocatalytic activity. Specifically, it refers to the magnetic perovskite mineral oxide La 0.7 Sr 0.3 MnO 3 with α-Fe 2 o 3 Formed p-n heterojunction magnetic composite oxide photocatalyst and its photocatalytic degradation of organic wastewater. Background technique [0002] Photocatalytic oxidation technology is a new type of advanced oxidation technology, which has gradually become a hot spot in the treatment of biologically refractory wastewater. 。 There are many materials for photocatalysts, including TiO 2 , ZnO, Fe 2 o 3 , perovskite oxides, etc., are widely used in the field of photocatalysis. However, a single photocatalyst has an unsatisfactory photocatalytic effect due to the high recombination rate of photogenerated electrons and holes, and the suspended micro-nano catalyst powder is easy to agglomerate,...

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Application Information

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IPC IPC(8): B01J23/889C02F1/30C02F101/30C02F101/38C02F103/34
CPCB01J23/002B01J23/8892C02F1/30B01J2523/00C02F2101/40C02F2101/30C02F2305/10C02F2209/08C02F2209/14C02F2103/34B01J35/33B01J35/39B01J2523/24B01J2523/3706B01J2523/72B01J2523/842Y02W10/37
Inventor 卫芝贤卫秋瑞曹雄王蓉珍岳盼
Owner ZHONGBEI UNIV
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