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Preparation method of catalyst for photocatalytic decomposition of pure water

A technology of photocatalysis and catalyst, applied in the field of photocatalytic decomposing pure water catalyst and its preparation field, can solve problems such as few reports, and achieve the effect of simple operation and low cost

Active Publication Date: 2021-12-31
GUANGDONG IND TECHN COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although transition metal phosphate catalysts have been widely used in the field of electrocatalysis and photocatalysis for decomposing pure water, using them as cocatalysts to modify Zn x CD 1-x S-based catalysts, so as to realize the photocatalytic decomposition of pure water, have rarely been reported.

Method used

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  • Preparation method of catalyst for photocatalytic decomposition of pure water
  • Preparation method of catalyst for photocatalytic decomposition of pure water
  • Preparation method of catalyst for photocatalytic decomposition of pure water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Example 1. Zn 0.3 Cd 0.7 S / ZnS(DETA) 0.5 material preparation

[0030] Measure 315ml of diethylenetriamine (DETA) and 35ml of pure water, mix them into a 500ml large beaker, weigh 1100mg (5mmol) of zinc acetate, 1322.5mg (5mmol) of cadmium acetate, and 2450mg (20mmol) of L-cysteine Put it into the beaker containing the mixed solution, and dissolve each drug in the beaker through a magnetic stirrer and an ultrasonic cleaner. After each drug is dissolved, pour the dissolved solution into the inner village of the reaction kettle. Put it in an electric constant temperature blast drying oven and react at 180°C for 24 hours. After the reaction stops, the prepared Zn 0.3 Cd 0.7 S / ZnS(DETA) 0.5 Recycled and put into an oven for dehydration to obtain yellow powder Zn 0.3 Cd 0.7 S / ZnS(DETA) 0.5 Material.

Embodiment 2

[0031] Example 2. Zn 0.3 Cd 0.7 S / ZnS(DETA) 0.5 Phosphorus oxide coating on material surface

[0032] Weigh 180mg of Zn 0.3 Cd 0.7 S / ZnS(DETA) 0.5 and 2385mg of sodium hypophosphite and poured into a 50ml centrifuge tube, add 30ml of deionized water, under the protection of argon, conduct ultrasonication in an ultrasonic instrument for 30 minutes, and then pour the ultrasonicated solution into photosynthetic Add 50ml of deionized water to the reactor, turn on the agitator, use a vacuum pump to pump the reactor into a vacuum state, and then turn on the xenon lamp to illuminate for 3 hours. During the illumination process, use NaH 2 PO 2 Capture photogenerated holes, assist the catalyst to carry out photocatalytic hydrogen production reaction, and at the same time use NaH 2 PO 2 It can capture photogenerated electrons, and the phosphorus oxide produced by oxidation and reduction reactions is coated on Zn 0.3 Cd 0.7 S / ZnS(DETA) 0.5 material surface. Complete Zn 0.3 C...

Embodiment 3

[0033] Embodiment 3. photochemical synthesis experiment

[0034] 1. Photochemical synthesis experiments of nickel and iron-based cocatalysts: Weigh 82 mg of prepared Zn 0.3 Cd 0.7 S / ZnS(DETA) 0.5 / PO x Materials, 38mg of nickel sulfate hexahydrate, 18.5mg of ferric nitrate nonahydrate and 141mg of sodium hypophosphite were poured into a 50ml centrifuge tube together, after adding 30ml of deionized water into the centrifuge tube, half a cycle was carried out under the protection of argon. Hours of ultrasonication, after the ultrasonication is completed, pour the ultrasonicated solution and 50ml deionized water into the photosynthetic reactor, vacuumize the reactor with a centrifugal pump, turn on the magnetic stirrer and the xenon lamp light source, light for two hours, and after two hours Turn off the xenon lamp and the stirrer, and let the solution in the reactor stand still for more than half an hour. After the material is completely deposited, it is recovered by centrifu...

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Abstract

According to the invention, a Zn0.3Cd0.7S / ZnS(DETA)0.5 heterojunction material is successfully prepared in a mixed solvent by utilizing a solvothermal method, and the material is subjected to modification such as phosphorus oxide loading and metal doping by utilizing a photochemical synthesis method. The crystal structure, forbidden bandwidth, morphology, composition and other parameters of the prepared sample are characterized in detail by using XRD, UV-vis DRS, SEM, EDS and other means. The prepared sample is subjected to a photocatalytic pure water decomposition test, and it is found that the (ZnaCdbFec)S / (ZndFee)S / POx / NifPi sample shows the highest photocatalytic pure water decomposition hydrogen production rate, and under the irradiation condition of visible light (lambda is greater than 420 nm and less than 780 nm), the hydrogen production rate reaches 1.465 mmol.h <-1 >. G <-1>.

Description

technical field [0001] The invention relates to a method for producing hydrogen from photocatalytic water, in particular to a catalyst for photocatalytically decomposing pure water and a preparation method thereof. Background technique [0002] As a secondary energy source, hydrogen energy has high combustion calorific value (energy density is 143kJ / g), large reserves (water can be used as hydrogen source), renewable (the combustion product is water, and water can be reduced to hydrogen again), convenient Advantages such as storage and transportation can be used to alleviate the current energy crisis and environmental pollution problems. Compared with the current hydrogen production methods from fossil fuels, the photocatalytic water splitting hydrogen production technology with simple operation and low cost has great potential, but the preparation of highly active and stable photocatalysts is still a long-term and arduous challenge. Among many photocatalytic materials, Zn ...

Claims

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Application Information

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IPC IPC(8): B01J27/18C01B3/04
CPCB01J27/1808C01B3/042B01J35/39Y02E60/36
Inventor 刘洋游遨肖吉宋金刚
Owner GUANGDONG IND TECHN COLLEGE
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