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Catalyst for converting Cr(VI) in aqueous solution and its preparation method and application

A technology of aqueous solution and catalyst, which is applied to the conversion of Cr in water by catalysts, and the synthesis of new catalysts, which can solve the problems of low solar energy utilization rate, achieve the effects of improving visible light absorption, simple process, and improving photocatalytic efficiency

Active Publication Date: 2019-07-05
LIAONING UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

After investigation, the perovskite NaTaO 3 It is a new type of non-metal broadband semiconductor material with high photocatalytic reduction performance. However, because of its wide energy band gap, NaTaO 3 Can only absorb ultraviolet light for photocatalytic reaction
Ultraviolet light accounts for only 4% of the solar spectrum, which makes the utilization of solar energy extremely small

Method used

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  • Catalyst for converting Cr(VI) in aqueous solution and its preparation method and application
  • Catalyst for converting Cr(VI) in aqueous solution and its preparation method and application
  • Catalyst for converting Cr(VI) in aqueous solution and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Embodiment 1 Catalyst Ag / NaTaO3 / Er 3+ :YAlO 3

[0032] (1) Preparation method

[0033] 1. NaTaO 3 Preparation: 1.7540g Ta 2 o 5 and 3.1750g NaOH (Ta / Na molar ratio 1:10), add 25mL of distilled water and stir evenly, then transfer to a hydrothermal kettle, treat at 180°C for 15h and then cool to room temperature. After the hydrothermal kettle is completely cooled, take it out and discard the supernatant to obtain a white powder, which is centrifuged and washed with deionized water until the eluate is neutral, and then rinsed twice with absolute ethanol. Finally, the product was dried in an oven at 60°C for 12 hours to obtain NaTaO 3 ,spare.

[0034] 2.Er 3+ :YAlO 3 Preparation: 0.0232g Er 2 o 3 , 1.3640g Y 2 o 3 Dissolve in concentrated nitric acid, and magnetically heat and stir until it is colorless and transparent to obtain a rare earth ion solution. Then take another beaker and weigh 4.5316g Al(NO 3 ) 3 9H 2 O was dissolved in distilled water, stirr...

Embodiment 2

[0047] Embodiment 2 Catalyst Au / NaTaO 3 / Er 3+ :YAlO 3

[0048] (1) Preparation method

[0049] 1. NaTaO 3 Preparation: with embodiment 1

[0050] 2.Er 3+ :YAlO 3 Preparation: with embodiment 1

[0051] 3. NaTaO 3 / Er 3+ :YAlO 3 Preparation: with embodiment 1

[0052] 4. Au / NaTaO 3 / Er 3+ :YAlO 3 Preparation: 1g NaTaO 3 / Er 3+ :YAlO 3 Dissolve the powder and 0.01g of chloroauric acid in 200mL of ethanol, and fully disperse for 30 minutes by ultrasonic (80kHZ, ultrasonic output power is 50W) to obtain a suspension, heat the suspension to the boiling point, keep the constant temperature at the boiling point for 30 minutes, filter and washed, the isolated powder was calcined at 350 °C for 1 h and finally ground to obtain Au / NaTaO 3 / Er 3+ :YAlO 3 .

[0053] (2) Characterization data

[0054] Prepared Au / NaTaO 3 / Er 3+ :YAlO 3 XRD and SEM such as Figure 5a with 5b shown. Depend on Figure 4a It can be seen that Au / NaTaO 3 / Er 3+ :YAlO 3 Also has Na...

Embodiment 3

[0058] Example 3Pt / NaTaO 3 / Er 3+ :YAlO 3

[0059] (1) Preparation method

[0060] 1. NaTaO 3 Preparation: with embodiment 1

[0061] 2.Er 3+ :YAlO 3 Preparation: with embodiment 1

[0062] 3. NaTaO 3 / Er 3+ :YAlO 3 Preparation: with embodiment 1

[0063] 4. Pt / NaTaO 3 / Er 3+ :YAlO 3 Preparation: 1g NaTaO 3 / Er 3+ :YAlO 3 Dissolve the powder and 0.01g of chloroplatinic acid in 200mL of ethanol, and fully disperse for 30 minutes by ultrasonic (80kHZ, ultrasonic output power: 50W) to obtain a suspension, heat the suspension to the boiling point, keep the temperature at the boiling point for 30 minutes, filter and washed, the isolated powder was calcined at 350 °C for 1 h and finally ground to obtain Pt / NaTaO 3 / Er 3+ :YAlO 3 .

[0064] (2) Characterization data:

[0065] Prepared Pt / NaTaO 3 / Er 3+ :YAlO 3 XRD and SEM such as Figure 6a with 6b shown. Depend on Figure 6a It can be seen that Pt / NaTaO 3 / Er 3+ :YAlO 3 Also has NaTaO 3 and Er 3+ :Y...

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Abstract

The invention relates to a catalyst for converting Cr(VI) in aqueous solution and its preparation method and application. The technical solution adopted is: NaTaO 3 and Er 3+ :YAlO 3 Synthesis of Er using ultrasonic dispersion and liquid boiling methods 3+ :YAlO 3 / NaTaO 3 . Finally, the NaTaO obtained above 3 / Er 3+ :YAlO 3 The powder and chloroauric acid, chloroplatinic acid or silver nitrate are dissolved in ethanol, and X / NaTaO is synthesized by ultrasonic dispersion and liquid boiling. 3 / Er 3+ :YAlO 3 (X=Ag, Au and Pt). Under sunlight, use X / NaTaO 3 / Er 3+ :YAlO 3 (X=Ag, Au and Pt) are used as catalysts to photocatalytically convert Cr(VI). The method of the invention is simple and novel, has low cost, generates no by-products and causes no environmental pollution.

Description

technical field [0001] The invention belongs to the field of chemical catalysis, and in particular relates to the synthesis of a novel catalyst and a method for using the catalyst to convert Cr(VI) in water. Background technique [0002] With the development of modern industry, hexavalent chromium (Cr(VI)) in natural water bodies and industrial wastewater has become a major hazard to the environment. Cr(VI) mainly comes from industries such as mining, electroplating, metal surface treatment, tanning, printing and dyeing, and foundry. 4- / CrO 4 2- ) and dichromate (Cr 2 o 7 2- ) into the environment. Studies have shown that Cr(VI) is 1000 times more carcinogenic than Cr(III), and generally has higher solubility, toxicity, instability and biological activity. If drinking water contains Cr(VI), it will increase the possibility of human body suffering from liver cancer, skin cancer and bladder cancer. On the contrary, an appropriate amount of Cr(III) is an essential elem...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/68C02F1/70C02F101/22
CPCC02F1/70B01J23/682C02F2101/22C02F2305/10B01J35/39Y02W10/37
Inventor 宋有涛李博文王君王依滴
Owner LIAONING UNIVERSITY
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