Photo-Fenton catalyst and preparation method and application thereof

A catalyst, Fenton's technology, applied in the direction of chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve the problems of poor degradation effect, low light utilization efficiency, poor adsorption of organic waste gas, etc., and achieve good degradation effect , Increase adsorption performance, easy to recycle effect

Pending Publication Date: 2019-10-08

NANJING UNIV OF TECH +2

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[0003] The photo-Fenton catalysts currently studied still have problems such as poor adsor...

Abstract

The invention discloses a photo-Fenton catalyst and a preparation method and application thereof. The preparation method comprises the following steps that a Ce-MOF film structure is formed on gamma-Al2O3 firstly, after vacuum drying, the Ce-MOF film structure is dipped in an OPA solution, an alkylation reaction is conducted, then alpha-FeOOH is generated on a formed compound through an in-situ growing method, and thus the compound-type photo-Fenton catalyst is obtained. The MOF structure with hydrophobic performance is formed on the gamma-Al2O3, the adsorption performance of VOCs can be enhanced, electronic transmissibility is strengthened, Fe<3+> is promoted to be reduced into Fe<2+>, meanwhile, Ce-MOF has abundant acid sites, and generating of a photo-Fenton catalytic oxidation reactionis also facilitated. Organic groups on MOF and the in-situ growing mode of the alpha-FeOOH can prevent iron leaching, the stability of the catalyst can be further improved, and the service life is prolonged.

Application Domain

Gas treatmentOrganic-compounds/hydrides/coordination-complexes catalysts +1

Technology Topic

Film structureAlkyl transfer +7

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Examples

Experimental program(3)
Effect test(1)

Example Embodiment

[0019] Example 1

[0020] (1) Add 0.434 g Ce(NO 3 ) 3 6H 2 O was dissolved in 4.5 mL deionized water and stirred continuously to obtain a uniform cerium nitrate solution, which was designated as solution A. 1.5 g carrier γ-Al 2 o 3 After soaking in the above solution A, continue to stir for 2 h;

[0021] (2) Dissolve 5.5 g of 2-methylimidazole in 20 mL of deionized water and stir it so that the 2-methylimidazole is completely dissolved, which is recorded as solution B, and the B solution is transferred to a pear-shaped separatory funnel , slowly drop it into the mixture formed by the carrier and solution A, and stir for 6 h during the dropwise addition;

[0022] (3) After the stirring, the mixed solution formed by the above solution B, solution A and the carrier was washed with methanol solution, filtered and the pH was adjusted to neutral, and then dried in a vacuum oven at 80 °C for 12 h to obtain Ce -MOF/γ-Al 2 o 3 spare;

[0023] (4) Dissolve 0.085 g of o-phthalaldehyde (OPA) in 25 mL of absolute ethanol solution to obtain solution C, and then the prepared Ce-MOF/γ-Al 2 o 3 Immerse in solution C for 24 hours, and stir intermittently for 5 minutes per hour. After the end, wash and dry to obtain the alkylated Ce-MOF/γ-Al 2 o 3;

[0024] (5) 1.237 g Fe(NO 3 ) 3 9H 2 O was dissolved in 20 mL deionized water and stirred to obtain solution D, then the pH of solution D was adjusted with 0.5 M NaOH to make it pH = 12, and the adjusted solution C was transferred to a 100 mL reactor, ℃, hydrothermal reaction for 24 h, after the reaction, it was washed and filtered several times, and the pH was adjusted to be neutral, and then dried at 60 ℃ to obtain α-FeOOH crystals for use;

[0025] (6) Take 0.23 g of the above-prepared α-FeOOH crystals and dissolve them again in 20 mL of deionized water to prepare a suspension, and mix 1.6 g of the alkylated Ce-MOF/γ-Al 2 o 3 Add it into it, sonicate for 30 min, then transfer to the reactor, grow in situ at 180 °C for 24 h, finally wash, filter, and vacuum dry at 80 °C to obtain the optical Fenton catalyst α-FeOOH/Ce-MOF/ γ-Al 2 o 3.

Example Embodiment

[0026] Example 2

[0027] (1) Add 0.868 g Ce(NO 3 ) 3 6H 2 O was dissolved in 9 mL of deionized water and stirred continuously to obtain a uniform cerium nitrate solution, which was designated as solution A, and 2 g of carrier γ-Al 2 o 3 Immerse in the above solution A, and continue to stir for 2 h;

[0028] (2) Dissolve 5 g of 2-methylimidazole in 20 mL of deionized water, and stir it to completely dissolve the 2-methylimidazole, record it as solution B, and transfer solution B to a pear-shaped separatory funnel , slowly drop it into the mixture formed by the carrier and solution A, and stir for 6 h during the dropwise addition;

[0029] (3) After the stirring, the mixed solution formed by the above solution B, solution A and the carrier was washed with methanol solution, filtered and the pH was adjusted to neutral, and then dried in a vacuum oven at 60 °C for 12 h to obtain Ce -MOF/γ-Al 2 o 3 spare;

[0030] (4) Dissolve 0.085 g of o-phthalaldehyde (OPA) in 25 mL of absolute ethanol solution to obtain solution C, and then the prepared Ce-MOF/γ-Al 2 o 3 Immerse in solution C for 24 h, and stir intermittently for 5 min per hour. After the end, wash and dry to obtain the alkylated Ce-MOF/γ-Al 2 o 3;

[0031] (5) 1.41 g Fe(NO 3 ) 3 9H 2 O was dissolved in 20 mL of deionized water and stirred to obtain solution D, then the pH of solution D was adjusted with 0.5M NaOH to make it pH=12, and the adjusted solution C was transferred to a 100 mL reactor, ℃, hydrothermal reaction for 12 h, after the reaction, it was washed and filtered several times, and the pH was adjusted to be neutral, and then dried at 60 ℃ to obtain α-FeOOH crystals for use;

[0032] (6) Take 0.3 g of the α-FeOOH crystals obtained above and dissolve them again in 20 mL of deionized water to prepare a suspension, and mix 1.6 g of the alkylated Ce-MOF/γ-Al 2 o 3 Add it into it and ultrasonically treat it for 30 min, then transfer it into the reactor, grow in situ at 180 °C for 24 h, finally wash, filter, and vacuum dry at 80 °C to obtain the light-Fenton catalyst α-FeOOH/Ce-MOF /γ-Al 2 o 3.

Example Embodiment

[0033] Example 3

[0034] (1) Add 0.434 g Ce(NO 3 ) 3 ·6H 2 O was dissolved in 4.5 mL deionized water and stirred continuously to obtain a uniform cerium nitrate solution, which was designated as solution A. 1.5 g carrier γ-Al 2 o 3 After soaking in the above solution A, continue to stir for 2 h;

[0035] (2) Dissolve 5 g of 2-methylimidazole in 20 mL of deionized water, and stir it to completely dissolve the 2-methylimidazole, record it as solution B, and transfer solution B to a pear-shaped separatory funnel , making it dropwise slowly into the mixture formed by the carrier and solution A, stirring for 8 h during the dropwise addition;

[0036] (3) After the stirring, the mixed solution formed by the above solution B, solution A and carrier was washed with methanol solution, filtered and the pH was adjusted to neutral, and then dried in a vacuum oven at 80 °C for 8 h to obtain Ce -MOF/γ-Al 2 o 3 spare;

[0037] (4) Dissolve 0.085 g of o-phthalaldehyde (OPA) in 25 mL of absolute ethanol solution to obtain solution C, and then the prepared Ce-MOF/γ-Al 2 o 3 Immerse in solution C for 24 h, and stir intermittently for 5 min per hour. After the end, wash and dry to obtain the alkylated Ce-MOF/γ-Al 2 o 3;

[0038] (5) 1.41 g Fe(NO 3 ) 3 9H 2 O was dissolved in 20 mL deionized water and stirred to obtain solution D, and then the pH of solution D was adjusted with 0.5M NaOH to make it pH=12, and the adjusted solution C was transferred to a 100 mL reactor, ℃, hydrothermal reaction for 12 h, after the reaction, it was washed and filtered several times, and the pH was adjusted to be neutral, and then dried at 60 ℃ to obtain α-FeOOH crystals for use;

[0039] (6) Take 0.27 g of the above-prepared α-FeOOH crystals and dissolve them again in 20 mL of deionized water to prepare a suspension, and mix 1.6 g of the alkylated Ce-MOF/γ-Al 2 o 3 Add it into it and ultrasonically treat it for 30 min, then transfer it into the reactor, grow in situ at 180 °C for 24 h, finally wash, filter, and vacuum dry at 60 °C to obtain the light-Fenton catalyst α-FeOOH/Ce-MOF /γ-Al 2 o 3.

[0040] Performance test, with the Fenton catalyst prepared by above-mentioned embodiment as test object

[0041] Photo-Fenton catalyst α-FeOOH/Ce-MOF/γ-Al prepared by the example 2 o 3 Catalytic degradation of toluene

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Photo-Fenton catalyst and preparation method and application thereof

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Description & Claims & Application Information

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