Preparation method for morphology-controllable hematite for degrading environmental pollutants

A technology of environmental pollutants and hematite, which is applied in the direction of iron oxide, iron oxide/iron hydroxide, etc., can solve the problems of high energy consumption and low yield of synthetic products, and achieve simple production process, fast reaction rate and excellent effect Effect

Inactive Publication Date: 2017-05-31
HUAZHONG AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the morphology of the product synthesized by the above method is an ellipsoid with uniform size distribution, due to the limitation of the volume of the hydrothermal reaction vessel, the yield of the synthesized product is low and the energy consumption is high.

Method used

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  • Preparation method for morphology-controllable hematite for degrading environmental pollutants
  • Preparation method for morphology-controllable hematite for degrading environmental pollutants
  • Preparation method for morphology-controllable hematite for degrading environmental pollutants

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment 1 (0.5%AA reducing condition)

[0035] First, weigh 6.750g FeCl 3 ·6H 2 O in a 500ml plastic bottle, add about 200ml distilled water to prepare FeCl 3 The solution is ready for use. At the same time, weigh 12.000g NaOH and dissolve it in 50ml distilled water to prepare a 6mol / L NaOH solution for use; 3 Add 6mol / L NaOH solution drop by drop in the solution until the pH in the system is about 7, the 3+ The molar ratio is 0.5%, and 0.044g reduced ascorbic acid is added; then, the pH value of the system is adjusted back to 7 with 0.1mol / L NaOH solution, and the volume is adjusted to 250ml with distilled water to make the final Fe of the system 3+ The concentration is 0.1mol / L; finally, after stirring evenly, the aforementioned product is aged in an oil bath heated to 100°C for 5 hours, and after cooling, the solid precipitate is separated by centrifugation, and the solid precipitate is washed several times with deionized water When the conductivity is less th...

Embodiment 2

[0037] Embodiment 2 (1.0%AA reduction condition)

[0038] First, weigh 6.750g FeCl 3 ·6H 2 O in a 500ml plastic bottle, add about 200ml distilled water to prepare FeCl 3 The solution is ready for use. At the same time, weigh 12.000g NaOH and dissolve it in 50ml distilled water to prepare a 6mol / L NaOH solution for use; 3 Add 6mol / L NaOH solution drop by drop in the solution until the pH in the system is about 7, the 3+ The molar ratio is 1.0%, and 0.088g reduced ascorbic acid is added; then, the pH value of the system is adjusted back to 7 with 0.1mol / L NaOH solution, and the volume is adjusted to 250ml with distilled water to make the system final Fe 3+ The concentration is 0.1mol / L; finally, after stirring evenly, the aforementioned product is aged in an oil bath heated to 100°C for 5 hours, and after cooling, the solid precipitate is separated by centrifugation, and the solid precipitate is washed several times with deionized water When the conductivity is less than 20μ...

Embodiment 3

[0040] Embodiment 3 (2.0%AA reduction condition)

[0041] First, weigh 6.750g FeCl 3 ·6H 2 O in a 500ml plastic bottle, add about 200ml distilled water to prepare FeCl 3 The solution is ready for use, meanwhile, take 12.000g NaOH and dissolve it in 50ml distilled water to prepare a 6mol / L NaOH solution for use; then, add FeCl under magnetic stirring condition 3 Add 6mol / L NaOH solution drop by drop in the solution until the pH in the system is about 7, the 3+ The molar ratio is 2.0%, and 0.176g of reduced ascorbic acid is added; then, the pH value of the system is adjusted back to 7 with 0.1mol / L NaOH solution, and the volume is adjusted to 250ml with distilled water to make the final Fe 3+ The concentration is 0.1mol / L; finally, after stirring evenly, the aforementioned product is aged in an oil bath heated to 100°C for 12 hours, and the solid precipitate is separated by centrifugation after cooling, and the solid precipitate is washed several times with deionized water W...

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Abstract

The invention discloses a preparation method for morphology-controllable hematite for degrading environmental pollutants. The method comprises the following steps: 1) dropwise adding 1-6mol / L alkali liquor into a ferric salt solution with Fe<3+> concentration of 0.1-1mol / L till the solution is neutral; 2) adding reductive-form ascorbic acid into the obtained product at the mole ratio of reductive-form ascorbic acid to Fe<3+> of (0.5-2):100 and adjusting pH value till being neutral; 4) performing high-temperature ageing on the acquired product, cooling and then centrifugally separating solid precipitate. The invention provides the method for chemically precipitating and quickly compounding a large number of pure hematite spheroid with excellent crystalline degree, uniform size distribution, monodispersity and controllable morphology at one time in the presence of reducing agent ascorbic acid. The hematite has an excellent degrading performance for the environmental pollutants and especially has an excellent effect for degrading toxic organic wastewater, such as degradation rate for methylene blue reaching up to 96.50%.

Description

technical field [0001] The invention relates to the production technology of inorganic materials, in particular to a method for preparing hematite with controllable morphology for the degradation of environmental pollutants. Background technique [0002] The excellent catalytic properties and electromagnetic properties of iron oxides make them widely used in the fields of light, electricity, magnetism, catalysis and medicine. α-Fe 2 o 3 Hematite is an n-type semiconductor material with a light band gap of 2.1eV. It is used in magnetic devices, pigments, catalysts, gas-sensitive materials, photo-oxidation of water and photocatalytic oxidation of photoanode materials, water and soil environments. It has certain application prospects in the fields of pollutant adsorption and degradation. [0003] At present, most of the methods for preparing hematite are water / solvothermal reactions involving surfactants and modifiers. Among them, FeCl 3 With NaOH as the reaction source, e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/06
CPCC01G49/06C01P2002/72C01P2004/03C01P2004/04C01P2004/32C01P2004/60C01P2006/90
Inventor 谭文峰俞雅婷汪明霞
Owner HUAZHONG AGRI UNIV
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