A kind of samarium oxychloride nanosheet and its preparation method and application

A technology of samarium oxychloride and nanosheets, which is applied in the field of photocatalytic synthesis of ammonia, can solve the problems of hindering photocatalyst electron transfer and limiting efficiency, and achieve the effects of simple separation and drying, promotion of adsorption and activation, and novel structure

Active Publication Date: 2021-07-16
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The adsorption and activation of nitrogen severely limit the photocatalytic synthesis of NH 3 s efficiency
In addition, compared with the normal hydrogen electrode (NHE), the N

Method used

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  • A kind of samarium oxychloride nanosheet and its preparation method and application
  • A kind of samarium oxychloride nanosheet and its preparation method and application
  • A kind of samarium oxychloride nanosheet and its preparation method and application

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preparation example Construction

[0033] Preparation of Graphene Oxide (GO):

[0034] 1) Mix 1.2g of flake graphite powder with 6.0g of potassium permanganate and grind together for at least 30min until they are evenly mixed.

[0035] 2) Put the mixed powder into a 100ml hydrothermal kettle, add 40ml of concentrated sulfuric acid, immediately tighten the hydrothermal kettle and put it in an ice-water bath for 24 hours of reaction.

[0036] 3) Turn the reaction kettle into an electric heating constant temperature blast drying oven, keep it warm at 80°C for 2 hours, and take out the hydrothermal kettle when it cools down to room temperature with the instrument.

[0037] 4) Put the obtained solid-liquid mixture into a 1000ml large beaker, add 40ml of 30% hydrogen peroxide solution to react the excess potassium permanganate in the solution until no bubbles come out, then pour it out after standing for 12 hours supernatant.

[0038] 5) Add 500ml of hydrochloric acid solution with a mass fraction of 5% and stir, a...

Embodiment 1

[0044] 1) Put 5mmol tris(hydroxymethyl)aminomethane, 4mmol concentrated hydrochloric acid into a beaker and add 50ml of H 2 O is made into a buffer solution without solid suspension, and its pH is about 7.5;

[0045] 2) Add 1 mmol of samarium chloride and 5 ml of graphene oxide solution, add a stirrer, cover with plastic wrap, and sonicate for 15 minutes;

[0046] 3) Put the beaker into an oil bath preheated to 60°C, and react for 3 hours;

[0047] 4) Pour the solution into a centrifuge tube, centrifuge, pour off the liquid, wrap the mouth of the centrifuge tube with plastic wrap and pierce the hole;

[0048] 5) Put the centrifuge tube into the refrigerator, freeze it for at least 6 hours, then put it into a freeze dryer, and freeze it for 24 hours;

[0049] 6) Put the obtained solid into a small porcelain boat and burn it at 550°C for 2 hours to generate amorphous smoky two-dimensional SmOCl nanosheets, which are denoted as A-SmOCl.

[0050] The sample that present embodim...

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Abstract

The invention discloses a samarium oxychloride nanosheet and its preparation method and application. Its structure is an amorphous smoky two-dimensional samarium oxychloride nanosheet. The preparation process is as follows: (1) first trishydroxymethylaminomethane and Mix hydrochloric acid to obtain a buffer solution, then add a soluble samarium source and graphene oxide for ultrasonic treatment to obtain a uniformly dispersed suspension, and obtain a precursor after solid-liquid separation and drying after the reaction; (2) the precursor is burned at 500-600°C Burn to get samarium oxide nanosheets. The inventive amorphous smoky two-dimensional samarium oxychloride nanosheets are used as photocatalytic N 2 and H 2 When O reacts to synthesize ammonia, it does not need to add any sacrificial agent, and reacts NH at room temperature 3 The yield reached 426μmol·g cat. –1 h –1 , for the rational design of photocatalytic N 2 Fixed high-efficiency catalysts improve new ideas.

Description

technical field [0001] The invention belongs to the technical field of photocatalytic synthesis of ammonia, in particular to an amorphous smoky two-dimensional samarium oxychloride nanosheet and a preparation method thereof, and its application as a photocatalytic ammonia synthesis catalyst. Background technique [0002] Rare earth oxides have become important emerging materials due to their unique properties. However, at present, the preparation methods of rare earth oxides in the academic circle are mainly limited to the synthesis of ultrafine particles of rare earth oxides. There are few studies on the synthesis methods of two-dimensional rare earth oxides. The current synthesis methods are relatively few, only similar to the mineralizer method. Less methods. In terms of preparation methods, rare earth-based oxyhalides use traditional solid-state reactions, which generally require higher temperatures, such as 900 degrees Celsius. However, traditional solid-state reactio...

Claims

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Application Information

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IPC IPC(8): C01F17/259C01C1/04B82Y40/00B01J27/06
CPCB01J27/06B01J35/004B82Y40/00C01C1/026C01C1/04C01F17/00C01P2002/72C01P2002/85Y02P20/52
Inventor 王梁炳郭瑞晗侯婷婷杨国
Owner CENT SOUTH UNIV
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