A kind of rice-shaped micron-scale iron oxide heterogeneous photo-Fenton catalyst and its preparation method

A micron-scale, iron oxide technology, applied in iron oxide/iron hydroxide, metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, etc., can solve the problem of large dosage of iron ion catalyst and application Limitation of scope and inability to recycle, etc., to achieve the effect of high photocatalytic Fenton catalytic performance, single morphology, and low cost of raw materials

Active Publication Date: 2020-05-26
ZHEJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] The traditional Fenton reaction, which is relatively mature in research at present, belongs to the homogeneous Fenton, and is an efficient and economical advanced oxidation technology. Its essence is H 2 o 2 in Fe 2+ OH with high activity is generated under the catalysis of OH, but its application range is greatly limited by some shortcomings, such as: the application range of pH is narrow, the dosage of iron ion catalyst is large, it cannot be recycled, and a large amount of Iron-containing sludge; if the iron ions can be immobilized without deactivating them, the above shortcomings can be overcome. Therefore, without affecting the removal rate of pollutants, the applicable pH range, Overcoming the loss of catalyst has become the main research direction of Fenton technology at present, and the heterogeneous catalytic oxidation system with iron loaded on the solid medium can effectively avoid the shortcomings of the homogeneous system, and has become a research hotspot in recent years. Fluidized bed reactor Compared with the fixed-bed catalytic reactor, the supported catalyst can be repeatedly contacted with the reaction liquid, so that the effective specific surface area of ​​the catalyst is greatly improved, and more and more people pay attention to it. The most common α-Fe in iron oxides 2 o 3 It belongs to the hexagonal crystal system, has a stable corundum structure, has high chemical and thermal stability, and α-Fe 2 o 3 It is an n-type semiconductor with a narrow bandgap width. It has a strong light absorption ability in the visible light region and can absorb about 30% of solar energy. It is often used as an excellent heterogeneous photo-Fenton-like catalyst

Method used

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  • A kind of rice-shaped micron-scale iron oxide heterogeneous photo-Fenton catalyst and its preparation method
  • A kind of rice-shaped micron-scale iron oxide heterogeneous photo-Fenton catalyst and its preparation method
  • A kind of rice-shaped micron-scale iron oxide heterogeneous photo-Fenton catalyst and its preparation method

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Effect test

Embodiment 1

[0028] First prepare 250 mL of FeCl with a concentration of 10 g / L 2 solution, and added 4 mL of dilute hydrochloric acid with a concentration of 0.03% to prevent its hydrolysis and precipitation; then, under the irradiation of a 300 W xenon lamp, slowly put 10 mL of 25% H 2 o 2 solution; then add the same amount of FeCl every 30 min for 5 consecutive times 2 (2.5g) and a concentration of 25% H 2 o 2 solution (10 mL); ultrasonic temperature was 65 ℃, power 99% under the conditions of continuous ultrasonication for 5 h; after standing for 3 days, the solution without precipitation was collected as the preparation of rice-shaped micron-sized iron oxide heterogeneous photo-Fenton Catalyst mother liquor: take 40mL of mother liquor and pour it into a 50mL hydrothermal reaction kettle, put the hydrothermal reaction kettle into a constant temperature drying oven, set the temperature at 170°C, take it out after 25 hours of reaction, cool, and suction filter to obtain a solid at 105...

Embodiment 2

[0030] First prepare 250 mL of FeCl with a concentration of 12 g / L 2 solution, and added 5 mL of dilute hydrochloric acid with a concentration of 0.03 % to prevent its hydrolysis and precipitation; then, under the irradiation of a 300 W xenon lamp, slowly add 10.2 mL of 30 % H 2 o 2 solution; then add the same amount of FeCl every 30 min for 5 consecutive times 2 (3 g) and a concentration of 30 % H 2 o 2 Solution (10.2 mL); ultrasonic temperature was 69 ℃, power 99% under the conditions of continuous ultrasonication for 6 h; after standing for 3 days, the solution without precipitation was collected as the preparation of rice-shaped micron-sized iron oxide heterogeneous photo-Fenton Catalyst mother liquor: take 40mL of mother liquor and pour it into a 50mL hydrothermal reaction kettle, then put the hydrothermal reaction kettle into a constant temperature drying oven, set the temperature at 180°C, take it out after 28 hours of reaction, cool, and suction filter to obtain a s...

Embodiment 3

[0032] First prepare 250 mL of FeCl with a concentration of 15 g / L 2 solution, and added 6 mL of dilute hydrochloric acid with a concentration of 0.03% to prevent its hydrolysis and precipitation; then, under the irradiation of a 300 W xenon lamp, slowly inject 11 mL of 35% H 2 o 2 solution; then add the same amount of FeCl every 30 min for 5 consecutive times 2 (3.75g) and a concentration of 35% H 2 o 2 solution (11 mL); ultrasonic temperature was 75 °C, power 99% under the conditions of continuous ultrasonication for 7 h; after standing for 3 days, the solution without precipitation was collected as the preparation of rice-shaped micron-sized iron oxide heterogeneous photo-Fenton Catalyst mother liquor: take 40mL of mother liquor and pour it into a 50mL hydrothermal reaction kettle, put the hydrothermal reaction kettle into a constant temperature drying oven, set the temperature at 190°C, take it out after 30 hours of reaction, cool, and suction filter to obtain a solid a...

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Abstract

The invention discloses a rice pudding-shaped micron-sized iron oxide heterogeneous photo-Fenton-like catalyst and a preparation method thereof. The method comprises the following steps: preparing a rice pudding-shaped micron-sized iron oxide heterogeneous photo-Fenton-like catalyst mother liquor from FeCl2 under an optical radiation condition through adding diluted hydrochloric acid and a H2O2 solution, and generating the rice pudding-shaped micron-sized iron oxide heterogeneous photo-Fenton-like catalyst under a hydrothermal reaction condition. The rice pudding-shaped micron-sized iron oxideheterogeneous photo-Fenton-like catalyst has the advantages of single morphology, high crystallization degree, high purity, good stability and high photo-Fenton catalysis performance, and can be widely applied to the field of catalytic degradation of pollutants; and the preparation method has the advantages of low cost of raw materials, simple reaction conditions, good product reappearance and environmentally-friendly technology.

Description

technical field [0001] The invention belongs to the field of preparation of environmental catalysts for degrading pollutants, and relates to a dumpling-shaped micron-level iron oxide heterogeneous photo-Fenton catalyst and a preparation method thereof. Background technique [0002] The traditional Fenton reaction, which is relatively mature in research at present, belongs to the homogeneous Fenton, and is an efficient and economical advanced oxidation technology. Its essence is H 2 o 2 in Fe 2+ OH with high activity is generated under the catalysis of OH, but its application range is greatly limited by some shortcomings, such as: the application range of pH is narrow, the dosage of iron ion catalyst is large, it cannot be recycled, and a large amount of Iron-containing sludge; if the iron ions can be immobilized without deactivating them, the above shortcomings can be overcome. Therefore, without affecting the removal rate of pollutants, the applicable pH range, Overcomin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/745C01G49/06C02F1/30C02F1/72C02F101/30
CPCB01J23/745B01J35/004C01G49/06C01P2002/72C01P2004/03C01P2004/04C01P2004/61C02F1/30C02F1/722C02F1/725C02F2101/308C02F2305/10
Inventor 洪孝挺张海滨柳继成单胜道庄海峰刘万鹏
Owner ZHEJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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