Method for preparing conjugated molecular hybridization semiconductor photocatalytic material by using mechanochemistry

A technology of photocatalytic materials and conjugated molecules, which is applied in the field of inorganic materials, can solve problems such as difficult to achieve large-scale production, cumbersome separation and treatment steps, and complicated process, so as to avoid the generation of waste liquid, improve photocatalytic activity and generate visible light Activity, the effect of simplifying the synthesis process

Inactive Publication Date: 2015-10-07
XINXIANG UNIV
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  • Description
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  • Application Information

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Problems solved by technology

[0006] For the preparation of conjugated molecular hybrid semiconductor photocatalytic materials by the current liquid phase method, the reaction conditions are harsh, the process is complicated, the separation and treatment steps are cumbersome, and it is difficult to achieve large-scale production, etc.

Method used

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  • Method for preparing conjugated molecular hybridization semiconductor photocatalytic material by using mechanochemistry
  • Method for preparing conjugated molecular hybridization semiconductor photocatalytic material by using mechanochemistry
  • Method for preparing conjugated molecular hybridization semiconductor photocatalytic material by using mechanochemistry

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Embodiment 1

[0027] Anatase nano-titanium dioxide (TiO 2 ) with conjugated molecular graphitic carbon nitride (g-C 3 N 4 ) Weighed according to different mass ratios, the doping source g-C 3 N 4 The mass fractions are respectively 3% to 5% of the total mass of raw materials. Grind and mix evenly in an agate mortar, add it to a 50 ml agate ball mill jar at a ball / material mass ratio of 10:1, and mill in a planetary high-energy ball mill at a speed of 350 rpm for 3 hours to obtain different proportions of g-C 3 N 4 / TiO 2 Hybrid photocatalytic materials. Structural characterization was carried out, and methylene blue was used as a probe compound to evaluate its visible and ultraviolet photocatalytic activity. The results showed that g-C 3 N 4 / TiO 2 The visible light catalytic activity of pure g-C 3 N 4 about 3 times that of pure TiO under UV light 2 The corresponding photocurrents are about 2.5 times and 1.5 times respectively.

Embodiment 2

[0029] Nano-zinc oxide (ZnO) and conjugated molecule g-C 3 N 4 Weigh according to different mass ratios, where g-C 3 N 4 The mass fractions are respectively 3% to 5% of the total mass of raw materials. Grind and mix evenly in an agate mortar, put them into a 50 ml agate ball mill jar at a ball / material mass ratio of 20:1, and mill in a ball mill at a speed of 450 rpm for 2 hours to obtain different proportions of g-C 3 N 4 / ZnO hybrid photocatalytic materials. Its structure was characterized, and its photocatalytic activity was evaluated at room temperature with methylene blue as the probe compound. The results showed that under visible light irradiation g-C 3 N 4 / ZnO photocatalytic activity is pure g-C 3 N 4 Nearly 3 times of that, the corresponding photocurrent is about 2.5 times, and the catalyst performance is stable.

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Abstract

The invention discloses a method for preparing a conjugated molecular hybridization semiconductor photocatalytic material by using mechanochemistry, and belongs to the field of inorganic materials. The method comprises the following steps of uniformly mixing molecules containing conjugated large Pi bonds and an inorganic semiconductor nanomaterial according to a certain mass proportion; adding the mixture in a high-energy ball milling tank under the condition of a certain ball / material ratio; and treating the mixture for a certain time at proper ball milling revolving speed to obtain the conjugated molecular hybridized semiconductor catalyst material. The method has the advantages that a technological process is simple, the method is easy and convenient to operate, solvent is not used, aftertreatment is simple, preparation cost is low, the prepared composite catalyst material is high in activity, and the method is suitable for preparing the conjugated molecular hybridization modified semiconductor photocatalytic material in batches.

Description

technical field [0001] The invention relates to a method for preparing a modified semiconductor photocatalytic material, in particular to a mechanochemical preparation of a conjugated molecular hetero [0002] The invention discloses a new method for converting semiconductor photocatalytic materials, which belongs to the field of inorganic materials. Background technique [0003] The energy efficiency, activity and photocorrosion stability of photocatalytic materials are the key to restrict their application. How to improve quantum efficiency and visible light absorption is still the core issue of photocatalytic materials. Based on the surface hybrid semiconductor of conjugated molecules to promote the separation effect of photogenerated carriers, surface hybridization can promote the migration of holes, effectively inhibit the recombination of photogenerated electrons and holes, improve the photocatalytic efficiency and inhibit the occurrence of photocorrosion, which...

Claims

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Application Information

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IPC IPC(8): B01J27/24
Inventor 周建伟王储备黄建新
Owner XINXIANG UNIV
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