Preparation method of catalyst for photocatalytic decomposition of pure water

A catalyst, photocatalysis technology, applied in the field of photochemical modification

Active Publication Date: 2022-03-01
DONGGUAN UNIV OF TECH
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  • 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

[0042] Example 1. Zn 0.21 Cd 0.79 S / D-ZnS(en) 0.5 Synthesis of heterojunction materials

[0043] Mix 0.5mmol zinc acetate, 0.5mmol cadmium acetate and 2mmol L-cysteine ​​in a mixed solvent of ethylenediamine: ultrapure water = 31.5ml: 1.5ml, and after ultrasonic stirring for 30min, the uniformly stirred suspension Transfer to the reactor and react at 180°C for 24h. Then centrifuge, wash the precipitated matter, and dry it in an oven at 60°C for 12 hours to recover a yellow sample, marked as Zn 0.21 Cd 0.79 S / D-ZnS(en) 0.5 .

Embodiment 2

[0044] Example 2. Zn 0.21 Cd 0.79 S / D-ZnS(en) 0.5 The first step of photochemical synthesis modification of heterojunction materials

[0045] Weigh 160mg Zn 0.21 Cd 0.79 S / D-ZnS(en) 0.5 Sample, dispersed in 80ml, 0.28125M NaH 2 PO 2 In aqueous solution, under the protection of argon, sonicate for 30min. Then the suspension was transferred to a photocatalytic reactor, and after the container was sealed, the whole reaction system was vacuumed for 15 min with a vacuum pump. Utilize a visible light source (300W xenon lamp equipped with a 420nm front cut-off filter) to irradiate the reactor for 3h, keep room temperature, and keep stirring. Molecular sieve column) for quantitative analysis. After the reaction is over, open the reactor, remove the supernatant, centrifuge to recover the precipitate, dry it in an oven at 60°C for 12 hours and recover a yellow sample, marked as Zn 0.21 Cd 0.79 S / D-ZnS(en) 0.5 / Pi.

Embodiment 3

[0046] Example 3. Zn 0.21 Cd 0.79 S / D-ZnS(en) 0.5 / The second step photochemical synthesis modification of Pi materials

[0047] Weigh 82mg Zn 0.21 Cd 0.79 S / D-ZnS(en) 0.5 / Pi sample, dispersed into 80ml of metal salts and NaH with different concentrations 2 PO 2 In the aqueous solution, the specific feeding combination is as follows:

[0048] ①Fe(NO 3 ) 3 9H 2 O(0.015mM), Co(NO 3 ) 2 ·6H 2 O(0.015mM), NiSO 4 ·6H 2 O(0.015mM), MnSO 4 ·H 2 O(0.015mM) and NaH 2 PO 2 (0.42mM);

[0049] ②Fe(NO 3 ) 3 9H 2 O(0.020mM), Co(NO 3 ) 2 ·6H 2 O (0.020mM), NiSO 4 ·6H 2 O(0.020mM), MnSO 4 ·H 2 O(0.020mM) and NaH 2 PO 2 (0.56mM);

[0050] ③Fe(NO 3 ) 3 9H 2 O(0.025mM), Co(NO 3 ) 2 ·6H 2 O(0.025mM), NiSO 4 ·6H 2 O(0.025mM), MnSO 4 ·H 2 O(0.025mM) and NaH 2 PO 2 (0.70mM);

[0051] ④Fe(NO 3 ) 3 9H 2 O(0.030mM), Co(NO 3 ) 2 ·6H 2 O (0.030mM), NiSO 4 ·6H 2 O(0.030mM), MnSO 4 ·H 2 O(0.030mM) and NaH 2 PO 2 (0.84mM);

[0052] ⑤Fe(NO 3 ) 3 9H...

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Abstract

The preparation method comprises the following steps: firstly, preparing a Zn < 0.21 > Cd < 0.79 > S/D-ZnS (en) < 0.5 > heterojunction material by utilizing a solvothermal method; furthermore, two-step photochemical synthesis modification is performed on the material, and a phosphorus oxide (Pi) protective layer and different types of cocatalysts (MPi and MS) are synthesized and loaded on the surface of the material. Due to the capture effect of H2PO < 2-> on photogenerated holes, the Zn0. 21 Cd0. 79 S/D-ZnS (en) 0.5 heterojunction material is synchronously subjected to photocatalytic hydrogen production reaction in the two steps of photochemical synthesis modification. The photochemical synthesis and ion exchange co-modification method provided by the invention can be used for constructing more Zn1-xCdxS catalytic systems, and an efficient and stable process of producing hydrogen by photocatalytic decomposition of pure water is realized. The series of processes are combined, continuous application of the process of partially decomposing water through photocatalysis and the process of decomposing pure water into hydrogen through photocatalysis is achieved for the first time, and high innovativeness and practicability are achieved.

Description

technical field [0001] The invention relates to a method for producing hydrogen from photocatalytic water, in particular to a photochemical modification method in which photocatalytic partial water decomposition and photocatalytic decomposition of pure water are applied in series. 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-te...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/187C01B3/04
CPCB01J35/004B01J27/187C01B3/042Y02E60/36
Inventor 宋金刚邓海朗羊广任林莎
Owner DONGGUAN UNIV OF TECH
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