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Annealing treatment method for improving photo-catalytic activity of zinc sulfide material

An annealing treatment, zinc sulfide technology, applied in chemical instruments and methods, catalyst activation/preparation, physical/chemical process catalysts, etc., to achieve the effect of improving the activity of photocatalytic hydrogen production

Inactive Publication Date: 2012-08-01
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the current research on ZnS photocatalytic hydrogen production, there are few reports on how the lattice integrity factors of the material affect its photocatalytic hydrogen production efficiency.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] 100mg S powder and 150mg ZnS nanoparticles were packed in two different clean small quartz tubes (one end sealed), and then the two small quartz tubes were placed in a large quartz tube (one end sealed), and the quartz tube was evacuated to The pressure in the pipe drops to 10 -1 Below Pa, seal it with an oxyhydrogen flame. Heat the sealed quartz tube to 150°C, and maintain this temperature for annealing for 1h, 2h, and 3h. The sample size after annealing was calculated by Scherrer's formula, the specific surface area was measured by specific surface area adsorption instrument (ASAP 2020), and the photocatalytic hydrogen production was detected by gas chromatography (GC-14C, Shimadzu). The results are shown in Table 1. It can be seen that compared with the unannealed sample, the photocatalytic hydrogen production activity of the sample annealed at 150 °C for 3 h in the S atmosphere increased by nearly 50%.

[0010] Table 1 Size, specific surface area and hydrogen prod...

Embodiment 2

[0013] 150mg ZnS nanoparticles are packed in a quartz tube (one end is sealed), and the quartz tube is evacuated until the pressure in the tube drops to 10 -1 Below Pa, seal it with an oxyhydrogen flame. Heat the sealed quartz tube to 150°C, and maintain this temperature for annealing for 1h, 2h, and 3h. The annealed sample size was calculated by Scherrer's formula, the specific surface area was measured by specific surface area adsorption instrument (ASAP 2020), and the photocatalytic hydrogen production was detected by gas chromatography (GC-14C, Shimadzu). The results are shown in Table 2. It can be seen that compared with the unannealed sample, the photocatalytic hydrogen production activity of the sample annealed at 150 °C for 3 h in a vacuum atmosphere is slightly improved.

[0014] Table 2 Size, specific surface area and hydrogen production activity of samples annealed at 150°C for 0-3h under vacuum atmosphere

[0015] sample

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Abstract

The invention discloses an annealing treatment method for improving photo-catalytic hydrogen production activity of a zinc sulfide material. According to the annealing treatment method, S atmosphere is provided for annealing treatment of a ZnS nanomaterial; since the ZnS nanomaterial obtained through hydrothermal synthesis contains more S vacancy defects, the ZnS material and S powder are sealed in a vacuum quartz tube by using oxy-hydrogen flame and heated to a certain temperature for annealing to fill S atoms in S vacancies, so that lattice internal defects of the material are eliminated. According to the method, the photo-catalytic hydrogen production activity of the ZnS material is greatly improved, and the method can have an important effect on actual application of the ZnS material in photocatalysis.

Description

technical field [0001] The invention relates to performing annealing treatment on ZnS material under the condition of S atmosphere to improve its photocatalytic hydrogen production activity. Background technique [0002] ZnS is a direct bandgap II-VI wide bandgap semiconductor, which theoretically has a strong photogenerated carrier generation efficiency. Studies have shown that ZnS nanomaterials are a class of photocatalysts with potential commercial applications, which can be used to produce hydrogen in water using light energy (I.Tsuji, J.Am.Chem.Soc., 2004, 126, 13406-13413) , Photoreduction of aldehydes and their derivatives (S.Yanagida, Chem.Lett., 1985, 1, 141-144), dehalogenation of halogenated benzenes (S.Kohtani, Chem.Lett., 2005, 34, 1056-1057) etc. [0003] Generally speaking, as a direct wide bandgap semiconductor material, the photogenerated carrier generation rate of ZnS is theoretically much higher than that of TiO 2 , so theoretically ZnS should have and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/04B01J37/08
Inventor 黄丰洪杨平
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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