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Fe2O3 micro-nano porous sphere, preparation method thereof and uses thereof

A ferric oxide, micro-nano technology, applied in iron oxide, chemical instruments and methods, iron oxide/iron hydroxide and other directions, can solve the problems of restricting popularization and application, difficult practical application, low energy utilization rate, etc. Simple, short time, convenient post-processing effect

Inactive Publication Date: 2012-08-01
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the deepening of research, various semiconductor photocatalytic materials have appeared one after another, among which titanium dioxide and zinc oxide materials have obvious ultraviolet photocatalytic effect; The energy of ultraviolet light is excited, and ultraviolet light only accounts for 5% of solar energy, making its energy utilization rate too low. In addition, it is difficult to separate powdery titanium dioxide and zinc oxide photocatalytic materials from pollutants during use It also restricts their popularization and application
Ferric oxide is a non-toxic, good response to visible light, and environmentally friendly N-type semiconductor (Eg=2.2eV) photocatalyst. Although its nanometer-scale ferric oxide particles have small size and high activity However, it is very easy to agglomerate, and the micron-scale ferric oxide particles with high stability are difficult to be practical because of their weak reactivity.

Method used

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  • Fe2O3 micro-nano porous sphere, preparation method thereof and uses thereof
  • Fe2O3 micro-nano porous sphere, preparation method thereof and uses thereof
  • Fe2O3 micro-nano porous sphere, preparation method thereof and uses thereof

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Experimental program
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Effect test

Embodiment 1

[0033] The concrete steps of preparation are:

[0034] Step 1: first mix ferric chloride hexahydrate, ascorbic acid, urea and water according to the molar ratio of 0.8:1.2:2:700 and then stir evenly; wherein, the water is deionized water to obtain a mixed solution. Then the mixed solution was reacted for 6 hours at a temperature of 140° C. and an autogenous pressure to obtain an intermediate product.

[0035] Step 2, the intermediate product is first separated, washed and dried; wherein, the separation process is centrifugation (or magnetic separation), the speed of centrifugation is 3500r / min, the time is 3min, and the washing process is to use deionized water Wash and separate the obtained powder until it becomes neutral, and dry at 75° C. for 2 hours to obtain porous iron carbonate. Then the porous iron carbonate was annealed at 450°C for 6h and then naturally cooled to room temperature; the time for heating to 450°C was 30min, and the obtained figure 1 , figure 2 and ...

Embodiment 2

[0037] The concrete steps of preparation are:

[0038] Step 1: first mix ferric chloride hexahydrate, ascorbic acid, urea and water according to the molar ratio of 0.9:1.1:2.3:650 and then stir evenly; wherein, the water is distilled water to obtain a mixed solution. Then, the mixed solution was reacted for 5.5 hours at a temperature of 150° C. and an autogenous pressure to obtain an intermediate product.

[0039] Step 2, the intermediate product is first separated, washed and dried; wherein, the separation process is centrifugation (or magnetic separation), the speed of centrifugation is 5000r / min, the time is 2.5min, and the washing process is to use distilled water to clean The powder obtained after the separation treatment is neutral, and the drying treatment is to dry at 78° C. for 2 hours to obtain porous iron carbonate. Then the porous iron carbonate was annealed at 480°C for 5.5h and then cooled to room temperature naturally; the time for heating to 480°C was 30min, a...

Embodiment 3

[0041] The concrete steps of preparation are:

[0042] Step 1: first mix ferric chloride hexahydrate, ascorbic acid, urea and water according to a molar ratio of 1:1:2.5:600 and then stir evenly; wherein, the water is deionized water to obtain a mixed solution. Then the mixed solution was reacted for 5 hours at a temperature of 160° C. and an autogenous pressure to obtain an intermediate product.

[0043] Step 2, the intermediate product is first separated, washed and dried; wherein, the separation process is centrifugation (or magnetic separation), the speed of centrifugation is 6000r / min, the time is 2min, and the washing process is to use deionized water Wash and separate the obtained powder until it becomes neutral, and dry at 80° C. for 2 hours to obtain porous iron carbonate. Then, the porous iron carbonate was annealed at 500°C for 5h and then cooled to room temperature naturally; the time for heating up to 500°C was 30min, and the following figure 1 , figure 2 and ...

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Abstract

The invention discloses a Fe2O3 micro-nano porous sphere, a preparation method thereof and uses thereof. The porous sphere is formed by Fe2O3 nanoparticles having a nanometer mesoporous alpha-Fe2O3 phase structure therebetween, wherein the diameter of the sphere is 500-5000nm, the specific surface area of the sphere is 15-25m<2> / g, particle sizes of the particles are 20-60nm, and pore diameters of mesopores are 2-50nm. The method comprises the following steps: mixing ferric chloride hexahydrate, ascorbic acid, urea and water, and uniformly stirring them to obtain a mixed liquid; reacting the mixed liquid under conditions that the temperature is 140-180DEG C and the pressure is a self-generated pressure for at least 4h to obtain an intermediate product; separating, washing and drying the intermediate product to obtain porous iron carbonate; and annealing the porous iron carbonate at 450-550DEG C for at least 4h, and naturally cooling the porous iron carbonate to room temperature to prepare the Fe2O3 micro-nano porous sphere. The Fe2O3 micro-nano porous sphere can be placed in water polluted by organic dyes to photocatalytically degrade under visible light, or in water polluted by potassium dichromate to adsorb.

Description

technical field [0001] The invention relates to a micro-nano porous ball, its preparation method and application, in particular to a ferric oxide micro-nano porous ball and its preparation method and application. Background technique [0002] As we all know, with the continuous advancement of industrialization, industrial pollution is becoming more and more serious, and the discharged sewage contains various inorganic and organic pollutants. The use of semiconductors to adsorb heavy metal pollutants and photocatalytic reactions can effectively mineralize harmful organic substances into carbon dioxide and water, thereby solving the problem of environmental pollution. With the deepening of research, various semiconductor photocatalytic materials have appeared one after another, among which titanium dioxide and zinc oxide materials have obvious ultraviolet photocatalytic effect; The energy of ultraviolet light is excited, and ultraviolet light only accounts for 5% of solar ene...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/06B82Y40/00C02F1/30C02F1/28B01J23/745B01J20/06B01J20/30C02F101/22C02F101/38
CPCY02W10/37
Inventor 刘岗汪国忠蔡伟平邓泉
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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