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Method for producing water-soluble epoxide by using sodium bromide through photoelectrode under simulated natural light

An epoxy, water-soluble technology, applied in electrolytic organic production, electrolytic components, electrolytic process, etc., can solve the problems of low-efficiency electrodes, toxic reagents, high energy consumption, etc., achieve high selectivity and avoid side reactions.

Pending Publication Date: 2022-07-29
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] (1) The efficiency of photoelectrocatalytic water splitting is low, mainly due to the challenge of the water oxidation half-reaction, which consists of a four-electron and four-proton transfer process
Furthermore, besides the slow kinetics, molecular oxygen produced at the photoanode has little economic value
[0007] (2) The classic olefin epoxidation method requires toxic reagents and harsh reaction conditions, which will cause serious environmental problems;
[0008] (3) Traditional electrosynthetic olefin epoxidation requires expensive and inefficient electrodes, and consumes a lot of energy and takes a long time to react

Method used

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  • Method for producing water-soluble epoxide by using sodium bromide through photoelectrode under simulated natural light
  • Method for producing water-soluble epoxide by using sodium bromide through photoelectrode under simulated natural light
  • Method for producing water-soluble epoxide by using sodium bromide through photoelectrode under simulated natural light

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Example 1 Preparation of Photoelectrode

[0043] The photoelectrode preparation method is as follows, and its schematic flow chart is as follows figure 1 shown.

[0044] a. Preparation of electrodeposited BiOI films

[0045] 0.04M2Bi (NO 3 ) 3 ·5H 2 O Add 50 mL of HNO freshly prepared pH 1.7 3 in aqueous solution. After transfer to an ice-water bath and sonicated for 5 min, it became a milky white solution. 0.4M KI was added to the solution, and after continued sonication in an ice-water bath for 5 minutes, the solution became clear and transparent orange-yellow. 20 mL of 0.23M p-benzoquinone solution in absolute ethanol was added, mixed and sonicated in an ice-water bath for 5 minutes to form a colorless and transparent reddish-brown electroplating solution. A typical three-electrode system consisting of a clean and dry FTO working electrode, a saturated Ag / AgCl reference electrode and a Pt wire counter electrode was used and electrodeposited at room temperatur...

Embodiment 2

[0048] Embodiment 2 photoelectrode utilizes sodium bromide to produce water-soluble epoxide

[0049] figure 2 It is a schematic diagram of the production system of water-soluble epoxide using sodium bromide with photoelectrode. A method for utilizing sodium bromide to produce water-soluble epoxide with photoelectrode under simulated natural light, comprising the following steps:

[0050] A, take material and prepare reaction solution: get molar concentration and be that the sodium bromide of 20mM, 20mM sodium styrene sulfonate volume percent are that the water of 20% acetonitrile adds in mixer and mixes; Continuous stirring in the pool;

[0051] b. Photocatalytic oxidation: The photoelectrochemical cell was under magnetic stirring and measured using an electrochemical analyzer. Using BiVO prepared in Example 1 4 The electrode was used as the working electrode, the platinum mesh was used as the counter electrode, and the saturated Ag / AgCl was used as the reference electrod...

Embodiment 3

[0052] Embodiment 3 photoelectrode utilizes sodium bromide to produce water-soluble epoxide

[0053] A method for utilizing sodium bromide to produce water-soluble epoxide with photoelectrode under simulated natural light, comprising the following steps:

[0054] A, take material and prepare reaction solution: getting molar concentration is 20mM sodium bromide, 20mM sodium methallyl sulfonate, and the volume percent is that the water of 20% acetonitrile adds in mixer and mixes; Continuous stirring in the quartz photoelectrochemical cell;

[0055] b. Photocatalytic oxidation: The photoelectrochemical cell was under magnetic stirring and measured using an electrochemical analyzer. Using BiVO prepared in Example 1 4 The electrode was used as the working electrode, the platinum mesh was used as the counter electrode, and the saturated Ag / AgCl was used as the reference electrode. Illumination from the back of the working electrode by simulating natural light. With 0.8V relative...

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Abstract

The invention discloses a method for producing water-soluble epoxide by using sodium bromide through a photoelectrode under simulated natural light, and belongs to the field of chemical energy. The method comprises the following steps: adding sodium bromide and water-soluble olefin into an acetonitrile aqueous solution to serve as an electrolyte; the prepared photoelectrode is inserted as a working electrode, saturated Ag / AgCl is used as a reference electrode, and a platinum net is used as a counter electrode. The epoxide corresponding to the soluble olefin is prepared by simulating natural light and carrying out constant-voltage electrolysis at room temperature with relatively low auxiliary bias voltage. The method has the advantages of high product conversion rate, high yield and good selectivity, reduces the pollution of industrial waste liquid to the environment, reduces the manufacturing cost of the epoxide, saves a large amount of electric energy, reduces the energy consumption, and is economical and environment-friendly.

Description

technical field [0001] The invention belongs to the preparation method of organic epoxides and hydrogen energy in the field of chemical energy, relates to the preparation of epoxides mainly by simulating natural light at a lower auxiliary bias voltage, and particularly relates to a kind of photoelectric catalytic oxidation using clean and cheap sodium bromide and Coupled hydrogen production. It is suitable for mainly using water-soluble olefins as raw materials. Background technique [0002] As a form of artificial photosynthesis, photoelectrochemical cells are widely studied for converting sunlight into solar fuel. Photoelectrochemical cell splitting of water into oxygen and hydrogen is considered as an environmentally friendly route for fuel production. To date, the efficiency of photoelectrochemical water splitting cells is still low from the perspective of practical applications, mainly due to the too slow reaction kinetics of water oxidation, and furthermore, the mole...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B3/05C25B3/07C25B3/23C25B3/21
CPCC25B3/05C25B3/07C25B3/23C25B3/21
Inventor 李斐刘晓
Owner DALIAN UNIV OF TECH
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