Preparation method for high-activity lanthanum phosphate nanorod and application of high-activity lanthanum phosphate nanorod as photocatalyst

A nanorod and lanthanum phosphate technology, which is applied in the field of nanomaterials, can solve the problems of rare earth phosphate photocatalytic properties that have not been reported, and achieve the effects of uniform size and distribution, low reaction temperature and simple operation process

Inactive Publication Date: 2015-05-13
TSINGHUA UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Because of the wide range of uses of rare earth phosphates, people are more and more interested in the research of rare earth phosphates, and photocatalysis has important prospects in environmental purification and energy utilization, and is a hotspot in physical an...

Method used

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  • Preparation method for high-activity lanthanum phosphate nanorod and application of high-activity lanthanum phosphate nanorod as photocatalyst
  • Preparation method for high-activity lanthanum phosphate nanorod and application of high-activity lanthanum phosphate nanorod as photocatalyst
  • Preparation method for high-activity lanthanum phosphate nanorod and application of high-activity lanthanum phosphate nanorod as photocatalyst

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Experimental program
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Embodiment 1

[0038] Embodiment 1, highly active LaPO 4 Preparation of nanorods

[0039] Weigh 3mmol of La(NO 3 ) 3 ·6H 2 O was dissolved in 15mL deionized water to obtain an aqueous solution of lanthanum nitrate (0.2M); weigh 3mmol of NaH 2 PO 4 2H 2 O was dissolved in 15 mL of deionized water to obtain an aqueous solution of sodium dihydrogen phosphate (0.2M); under magnetic stirring, the aqueous solution of sodium dihydrogen phosphate was added dropwise to the aqueous solution of lanthanum nitrate at a constant speed, and the stirring was continued for 1 h, and then transferred to 40 mL In a hydrothermal kettle, the filling degree is 75%, 180 ° C hydrothermal reaction for 12 hours, cooled to room temperature, the product is centrifugally washed to neutrality, and dried at 80 ° C for 24 hours to obtain a dried sample (that is, ordinary LaPO 4 Nanorods with a diameter of 10nm-20nm and a length of 20nm-200nm; take the dried sample and heat it at 350°C for 3 hours under vacuum to obtai...

Embodiment 2

[0045] Example 2, LaPO 4 Photocatalytic Activity Evaluation of Nanorods

[0046] Measure the common LaPO prepared in 25mg embodiment 1 respectively 4 Nanorods and vacuum-heated lanthanum phosphate nanorods were mixed with 50ml concentration of 1.0×10 -5 The mol / L MB solution was mixed in a test tube and stirred for 30 min in a dark room environment to make LaPO 4 Adsorption equilibrium and uniform dispersion were achieved in MB solution. Then place it in a 20W, 254nm ultraviolet light evaluation device for activity evaluation, and the light intensity when stable is 0.9mW / cm 2 , take a sample every 50min (3.0ml each time), centrifuge at a speed of 12000r / min for 10min, take the supernatant and measure the remaining concentration of MB with a Hitachi U-3010 UV-visible spectrophotometer, and calculate the degradation of MB The difference in ultraviolet photocatalytic activity between ordinary lanthanum phosphate nanorods and vacuum-heated lanthanum phosphate nanorods was inve...

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Abstract

The invention provides a high-activity lanthanum phosphate nanorod, a preparation method for the high-activity lanthanum phosphate nanorod and an application of the high-activity lanthanum phosphate nanorod as a photocatalyst in the field of photocatalysis. The preparation method comprises the following steps: producing a hydrothermal reaction of soluble lanthanum salt and soluble phosphate to obtain a lanthanum phosphate nanorod A; performing vacuum heating treatment on the lanthanum phosphate nanorod A at 340-360 DEG C for 1-5 hours to obtain the high-activity lanthanum phosphate nanorod. The high-activity lanthanum phosphate nanorod is prepared by utilizing the hydrothermal method and the vacuum heating treatment; compared with the lanthanum phosphate nanorod A not subjected to the vacuum heating treatment, the prepared lanthanum phosphate nanorod is uniform in size and size distribution, has the diameter of 10-20 nm and the length of 100-200 nm, has relatively high photocatalytic activity in water, and can be applied to catalytic degradation removal of pollutants in a water environment. The preparation method has the advantages of simple operation process, low-price raw materials, low reaction temperature, easiness for large-scale production and the like.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials, and in particular relates to a highly active lanthanum phosphate nanorod, a preparation method thereof and its application as a photocatalyst in the field of photocatalysis. Background technique [0002] Rare earth phosphates have good chemical stability and thermal stability and unique structural characteristics, making them magnetic, sensitive, conductive and good gas sensitivity, etc., so they are used in optical materials, magneto-optical materials, laser materials, media It has a wide range of applications in electrical materials and chemical sensing. Such as synthetic rare earth LaPO 4 : Ce, Tb crystal, is a kind of photoluminescent material that emits green light, and is widely used in the production of phosphor powder. Currently LaPO 4 The synthetic methods of the main solid-phase synthesis method, hydrothermal synthesis method and sol-gel method. The solid-phase method generall...

Claims

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Application Information

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IPC IPC(8): C01B25/37B82Y30/00B82Y40/00B01J27/18
Inventor 姚文清汪凯朱永法
Owner TSINGHUA UNIV
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