Method for degrading methyl orange by use of perovskite/polysaccharide composite photocatalyst

A composite photocatalytic and perovskite technology, applied in the field of photocatalytic degradation of methyl orange, perovskite/polysaccharide composite photocatalytic degradation of methyl orange, to improve photocatalytic degradation ability, high catalytic degradation effect, and conducive to recycling The effect of reuse

Active Publication Date: 2014-07-23
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But so far, there have been no reports of perovskite oxide / polysaccharide crosslinked composites as photocatalytic degradation of methyl orange.

Method used

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  • Method for degrading methyl orange by use of perovskite/polysaccharide composite photocatalyst
  • Method for degrading methyl orange by use of perovskite/polysaccharide composite photocatalyst
  • Method for degrading methyl orange by use of perovskite/polysaccharide composite photocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) Preparation of perovskite oxide by sol-gel method: 43.3g La(NO 3 ) 3 .6H 2 O,30.78g Fe(NO 3 ) 2 .9H 2 O and 2.42g Cu(NO 3 ) 2 .3H 2 O was dissolved in 100mL of distilled water, 54.6g of citric acid and 18.2mL of ethylene glycol were added, then dried at 110°C to an expanded state, then calcined in a muffle furnace at 700°C for 10h, cooled and ground to obtain perovskite Mine LaFe 0.9 Cu 0.1 o 3 Precursor. figure 2 Perovskite LaFe prepared in 0.9 Cu 0.1 o 3 XRD patterns of precursors and LaFe in literature reports 0.9 Cu 0.1 o 3 The XRD diagram of (Junhua Zhang, Haibo Deng, Lu Lin. Wet Aerobic Oxidation of Lignin into Aromatic Aldehydes Catalysed by a Perovskite‐type Oxide: LaFe 1‐x Cu x o 3 , Molecules2009,14,2747‐2757; the perovskite is used to catalyze lignin) consistent, proving that the perovskite prepared by this method is LaFe 0.9 Cu 0.1 o 3 .

[0037] (2) Perovskite / chitosan composite photocatalytic material: Add 1g chitosan to 40mL ac...

Embodiment 2

[0047] (1) Preparation of perovskite oxide by sol-gel method: 43.3g La(NO 3 ) 3 .6H 2 O,27.36g Fe(NO 3 ) 2 .9H 2 O and 4.84g Cu(NO 3 ) 2 .3H 2 O was dissolved in 100mL of distilled water, 63g of citric acid and 21.6mL of ethylene glycol were added, then dried at 120°C into an expanded state, then calcined in a muffle furnace at 800°C for 8 hours, cooled and ground to obtain perovskite LaFe 0.8 Cu 0.2 o 3 Precursor.

[0048] (2) Perovskite / chitosan composite photocatalytic material: add 1g chitosan to 50mL acetic acid solution with a mass concentration of 2.5%, stir to dissolve, then add 1g perovskite powder, ultrasonic treatment for 2h, ultrasonic frequency It is 35KHz and dried at 60°C to form a film. Add the prepared membrane to 50mL of 0.25mol / L sodium hydroxide solution for coagulation, and then immerse the membrane in 100mL of 0.25% glutaraldehyde by volume for 60min. Finally, wash with ethanol and water respectively, and dry at 50°C for 24h.

[0049] (3) Pe...

Embodiment 3

[0053] (1) Preparation of perovskite oxide by sol-gel method: 43.3g La(NO 3 ) 3 .6H 2 O,17.1g Fe(NO 3 ) 2 .9H 2 O and 12.1g Cu(NO 3 )2 .3H 2 O was dissolved in 100mL of distilled water, 71.4g of citric acid and 26.78mL of ethylene glycol were added, then dried at 130°C into an expanded state, then calcined in a muffle furnace at 900°C for 6h, cooled and ground to obtain perovskite Mine LaFe 0.5 Cu 0.5 O3 precursor. It is calculated based on the amount of substances added by various elements during the preparation process.

[0054] (2) Perovskite / chitosan composite photocatalytic material: add 1g chitosan to 60mL 3% acetic acid solution, stir to dissolve, then add 2g perovskite powder, ultrasonic treatment for 3h, ultrasonic frequency is 40KHz, in Dry at 70°C to form a film. Add the prepared membrane to 55mL of 0.3mol / L sodium hydroxide solution for coagulation, and then immerse the membrane in 110mL of 0.25% glutaraldehyde by volume for 90min. Finally, wash with et...

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Abstract

The invention discloses a method for degrading methyl orange by use of perovskite/polysaccharide composite photocatalyst. The method comprises the following steps: preparing perovskite by utilizing nitrate of La, Cu and Fe, adding the perovskite and chitosan into an acetic acid solution, and performing ultrasonic treatment; drying to form a film to obtain a perovskite/chitosan composite photocatalyst; or adding xylan into distilled water, adding sodium hypophosphite and citric acid solution, adding perovskite, performing ultrasonic treatment, dehydrating, crosslinking to form a film, and washing with ethanol to obtain a perovskite/xylan composite photocatalyst; adding the composite photocatalytic material into the methyl orange solution, respectively reacting for 470-490 minutes at normal temperature in ultraviolet radiation. The polysaccharide used in the method is formed by compounding the catalyst and polysaccharide respectively with chitosan and xylan, the methyl orange photocatlytic degrading capability of the polysaccharide can be improved. The polysaccharide has the advantages of high catalytic efficiency, strong photo-response performance, regeneration, recycling and the like.

Description

technical field [0001] The invention relates to a method for photocatalytically degrading methyl orange, in particular to a method for perovskite / polysaccharide composite photocatalytically degrading methyl orange; it belongs to the field of sewage treatment in the printing and dyeing industry. Background technique [0002] Since the 21st century, China's economy has continued to develop rapidly, which is inseparable from the rise of manufacturing and heavy industry, but it has also "developed" with environmental pollution and destruction. The seriousness of water pollution has brought enormous pressure and threat to our country's ecological environment and people's life and health. Therefore, how to deal with pollutants to protect our indispensable water resources has become the key to environmental governance today. Water pollutants have carcinogenic, teratogenic, and mutagenic potential toxicity, and have been included in the blacklist of environmental priority pollutant...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/32B01J31/38
Inventor 任俊莉邓奥杰孙润仓李慧玲王文菊陈建锋
Owner SOUTH CHINA UNIV OF TECH
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