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A doped cafe2o4@α-fe2o3 heterojunction composite photocatalyst and its preparation method and application

A doped, heterojunction technology, used in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of high cost, reduce preparation costs, Reduced usage, cost savings

Active Publication Date: 2019-05-07
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The cost of photocatalyst preparation is one of the important factors restricting the large-scale application of photocatalytic technology. At present, most photocatalysts are made of chemical reagents, and the cost is relatively high.

Method used

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  • A doped cafe2o4@α-fe2o3 heterojunction composite photocatalyst and its preparation method and application
  • A doped cafe2o4@α-fe2o3 heterojunction composite photocatalyst and its preparation method and application
  • A doped cafe2o4@α-fe2o3 heterojunction composite photocatalyst and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Take 20 g of dried and ground converter sludge (wherein the mass percentage of TFe is 56.5%, and the mass percentage of CaO is 12.5%), add it to 200 mL of HCl solution with a concentration of 3 mol / L, and stir the acid in a water bath at 70 ° C. Decompose for 1 hour, stirring at a speed of 500 rpm, let the reacted solid-liquid mixture stand at room temperature for 10 hours, filter out insoluble matter to obtain a clear acid solution, and detect the concentration of Fe ions and Ca ions in the acid solution.

[0032] (2) Pour the acid solution obtained in step (1) into a beaker, add 5 mL of 30% hydrogen peroxide dropwise, stir for 1 h in a water bath at 70 ° C, add 40 g of sodium oxalate and continue stirring for 1 h to obtain a clear mixed solution.

[0033] (3) In the mixed solution of step (2), dropwise add NaOH solution with a concentration of 1mol / L to adjust the pH to 5, stir for 0.5h and then move it into the reaction kettle, heat water at 150°C for 8h, and cool...

Embodiment 2

[0038] (1) Take 20 g of dried and ground converter sludge (the mass percentage of Tfe is 56.5%, and the mass percentage of CaO is 12.5%), add it to 170 mL of HCl solution with a concentration of 3.5 mol / L, and stir in a water bath at 80 °C Acid hydrolysis for 2 hours, with a stirring speed of 400 rpm. The reacted solid-liquid mixture was allowed to stand at room temperature for 15 hours, and the insoluble matter was filtered off to obtain a clear acid solution. The concentrations of Fe ions and Ca ions in the acid solution were detected.

[0039] (2) Pour the acid solution prepared in step (1) into a beaker, add 5 mL of 30% hydrogen peroxide dropwise, stir for 0.5 h in a water bath at 80°C, add 40 g of sodium oxalate and continue stirring for 2 h to obtain a clear mixed solution .

[0040] (3) Add KOH solution with a concentration of 0.5mol / L dropwise to the mixed solution in step (2) to adjust the pH to 4.5, stir for 1 hour, then move it into the reaction kettle, heat it in w...

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Abstract

The invention discloses a doped CaFe 2 O 4 @α‑Fe 2 O 3 The heterojunction composite photocatalyst and its preparation method and application use hydrochloric acid to acidolyze converter sludge, and transfer Fe, Ca, Al, Mg, Mn and other valuable metal ions in the converter sludge to the acidolysis solution and filter them out The insoluble matter is acidolyzed, and a certain amount of sodium oxalate is added to obtain a mixed solution. The mixed solution undergoes hydrothermal reaction, secondary precipitation at room temperature, and short-term heat treatment to obtain the product. The constituent elements of the product of the present invention all come from converter sludge, without adding any chemical reagent raw materials, thereby breaking through the current limitation of relying solely on a variety of chemical reagents to prepare the material, while reducing the preparation cost, it is a metallurgical iron-containing dust sludge. It provides a new way for high value-added utilization. The catalyst produced has good photocatalytic activity and regeneration and recycling properties, and can be effectively used for photocatalytic degradation of organic dye pollutants in wastewater.

Description

technical field [0001] The invention belongs to the technical field of photocatalyst preparation, and in particular relates to a preparation of doped CaFe from converter sludge. 2 o 4 @α-Fe 2 o 3 Methods and applications of heterojunction composite photocatalysts. Background technique [0002] The solid waste generated in the iron and steel metallurgy process contains more Fe, Ca and various valuable metal elements, and is a secondary resource with high resource endowment. However, the current disposal methods are mostly disposal or low value-added utilization, resulting in It is a great waste of resources, so the development of high value-added utilization new technologies for such secondary resources is an urgent need for technological upgrading of the metallurgical industry, realization of mineral resource recycling, and sustainable development. Steelmaking converter sludge is the iron-containing dust collected through the wet dust removal process in the converter ste...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/78B01J23/889B09B3/00C02F1/30C02F101/30
CPCC02F1/30B01J23/78B01J23/8892B09B3/00C02F2101/308B01J35/39Y02W10/37
Inventor 吴照金彭超杨浩王平刘伟明曹发斌
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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