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Method for synthesizing CdSe-BiOCl heterojunction

A synthesis method and heterojunction technology, applied in chemical instruments and methods, water treatment of special compounds, water/sludge/sewage treatment, etc., can solve problems such as toxic and harmful chemical reagents, complex synthesis process, etc., and achieve improved photocatalytic The effect of performance, simple preparation process and wide source

Inactive Publication Date: 2021-01-26
NANJING UNIV OF TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The synthesis process of CdSe quantum dots is complex and introduces a large number of toxic and harmful chemical reagents

Method used

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  • Method for synthesizing CdSe-BiOCl heterojunction
  • Method for synthesizing CdSe-BiOCl heterojunction
  • Method for synthesizing CdSe-BiOCl heterojunction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 1. Preparation of BiOCl, weigh 4.850g Bi(NO 3 ) 3 ·5H 2 O and 0.877g NaCl(Bi(NO 3 ) 3 ·5H 2 The molar ratio of O to NaCl was 1:1.5), and 60 mL of deionized water was added, and magnetically stirred until the solid was completely dissolved. The solution was transferred to a polytetrafluoroethylene liner of a 100mL hydrothermal reactor, and reacted at 120°C for 24h. After cooling to room temperature, the product was centrifuged to collect the precipitate, washed three times with deionized water, and dried in an oven at 60°C for 10 h to obtain BiOCl nanosheets.

[0038] 2. Se source precursor preparation, weigh 0.395g selenium powder and 1.975g Na 2 SO 3 (Selenium powder and Na 2 SO 3 The mass ratio of 1:5), and added 30mL deionized water, moved to a 100mL three-necked flask. Under the protection of nitrogen, stir magnetically, and reflux in a constant temperature water bath at 60° C. for 8 hours, and extract the clear liquid by suction filtration to obtain the S...

Embodiment 2

[0042] 1. Preparation of BiOCl, weigh 4.850Bi(NO 3 ) 3 ·5H 2 O and 0.818g NaCl(Bi(NO 3 ) 3 ·5H 2 The molar ratio of O to NaCl is 1:1.4), and magnetically stirred until the solid is completely dissolved. The solution was transferred to the polytetrafluoroethylene lining of a 100mL hydrothermal reactor, and reacted at 135°C for 21h. The product was centrifuged to collect the precipitate, washed three times with deionized water, and dried in an oven at 65 °C for 9 h to prepare BiOCl nanosheets.

[0043] 2. Se source precursor preparation, weigh 0.395g selenium powder and 1.876g Na 2 SO 3 (Selenium powder and Na 2 SO 3 The mass ratio of 1:4.75), and added 30mL deionized water, moved to a 100mL three-necked flask. Under the protection of nitrogen, stir magnetically, and reflux in a constant temperature water bath at 68° C. for 7 hours, and extract the clear liquid by suction filtration to obtain the Se source precursor.

[0044] 3. Dissolve 1.066g of cadmium acetate dihy...

Embodiment 3

[0047] 1. Preparation of BiOCl, weigh 4.850g Bi(NO 3 ) 3 ·5H 2 O and 0.760g NaCl(Bi(NO 3 ) 3 ·5H 2 The molar ratio of O to NaCl is 1:1.3), add 60 mL of deionized water, and stir magnetically until the solid is completely dissolved. The solution was transferred to the polytetrafluoroethylene lining of a 100mL hydrothermal reactor, and reacted at 150°C for 18h. The product was centrifuged to collect the precipitate, washed three times with deionized water, and dried in an oven at 70°C for 8 hours to obtain BiOCl nanosheets.

[0048] 2. Se source precursor preparation, weigh 0.395g selenium powder and 1.778g Na 2 SO 3 (Selenium powder and Na 2 SO 3 The mass ratio of 1:4.5), and added 30mL deionized water, moved to a 100mL three-necked flask. Under the protection of nitrogen, stir magnetically, and reflux in a constant temperature water bath at 75° C. for 6 h, and extract the clear liquid by suction filtration to obtain the Se source precursor.

[0049] 3. Dissolve 1.06...

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Abstract

The invention discloses a synthesis method of a CdSe-BiOCl heterojunction. The method comprises the following steps: (1), by using Bi(NO3)3.5H2O and NaCl as raw materials and water as a solvent, carrying out hydrothermal synthesis to obtain BiOCl; (2), dissolving Na2SO3 and selenium powder in deionized water, and carrying out first heating and reflux to prepare a Se source precursor; dissolving cadmium acetate dihydrate and thioglycollic acid in deionized water to prepare an alkaline solution, injecting the Se source precursor into the alkaline solution, and carrying out second heating and reflux under the protection of nitrogen to prepare a CdSe quantum dot aqueous solution; and (3), mixing the CdSe quantum dot aqueous solution with BiOCl, and carrying out in-situ coprecipitation, so as to prepare a CdSe-BiOCl heterojunction; and enabling the CdSe-BiOCl heterojunction to be composed of quantum dots CdSe and BiOCl nanometer particles. The prepared CdSe-BiOCl heterojunction can be usedas a photocatalyst, and when rhodamine B is subjected to photocatalytic degradation, the degradation rate of the CdSe-BiOCl heterojunction can reach over 1.4 times of that of pure BiOCl.

Description

technical field [0001] The invention relates to a synthesis method of a CdSe-BiOCl heterojunction, belonging to the field of photocatalysts. Background technique [0002] At present, the synthesis of CdSe quantum dots is to heat up cadmium oxide (CdO) and oleic acid under the protection of argon, and then put them into a vacuum drying oven to remove water after cooling to make a cadmium solution. Dissolve selenium powder (Se) in tributyl phosphate (TBP) in an oxygen-free environment and then dilute it with octadecene (ODE) to obtain a selenium solution. Then add octadecylamine (ODA), trioctylphosphine oxide (TOPO) and octadecene (ODE) to the cadmium solution, heat the cadmium solution to a certain degree in an argon atmosphere, and then add selenium solution . Tributyl phosphate and octadecene are both harmful substances. Some studies even believe that tributyl phosphate may cause cancer. Trioctylphosphine oxide is an irritant and can seriously damage the eyes. The synthe...

Claims

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Application Information

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IPC IPC(8): B01J27/06C02F1/30C02F101/38
CPCB01J27/06C02F1/30C02F2101/38C02F2305/10B01J35/39
Inventor 师红旗张健顾书洵汤涛丁毅沈晓冬
Owner NANJING UNIV OF TECH
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