Near-infrared response carbon quantum dots/Bi2MoO6 photocatalyst and preparing method thereof

Abstract

A near-infrared response carbon quantum dots (CQDs) / Bi2MoO6 photocatalyst is composed of Bi2MoO6 and CQDs, wherein CQDs are distributed on Bi2MoO6, and the mass ratio of CQDs to Bi2MoO6 is 1-15%:85-99%. The invention further provides a preparing method of the photocatalyst.Bi(NO3)3.5H2O aqueous solution and Na2MoO4.2H2O aqueous solution are mixed to obtain light yellow suspension liquid; CQDs aqueous solution is added to the light yellow suspension liquid and then transferred into a hydrothermal kettle for reaction at 140-180 DEG C, a product is washed with absolute ethyl alcohol and deionized water in sequence, then centrifugation is conducted, and sediment is dried, so that the CQDs / Bi2MoO6 composite photocatalyst with near-infrared photocatalytic activity is obtained. The photocatalyst has a wide spectral response range, high current carrier separation efficiency and high photocatalytic activity.

Description

technical field

[0001] The invention belongs to the field of materials science, and relates to a photocatalytic material, specifically a near-infrared response carbon quantum dot / Bi 2 MoO 6 Photocatalyst and preparation method. Background technique

[0002] Due to the increasing environmental pollution and energy crisis in the world, the research and application of semiconductor photocatalysis have attracted widespread attention. The core issue of photocatalytic technology is the design, development and development of suitable photocatalysts, especially the research on high-performance photocatalytic materials with wide spectral response has become a top priority. However, most of the currently developed photocatalytic materials can only absorb ultraviolet light or visible light, but cannot utilize near-infrared light and infrared light, which account for 53% of the solar spectrum. In recent years, researchers have discovered that carbon quantum dots (CQDs) have upconvers...

Examples

Embodiment 1

[0029] A CQDs / Bi 2 MoO 6 Composite photocatalyst consisting of 50-100nm nanosheet Bi 2 MoO 6 and 5-10nm carbon quantum dots, and the CQDs nanoparticles are distributed in the nanometer-sized sheet-like Bi 2 MoO 6 Above, calculated by mass percentage, CQDs of nanoparticles: nanometer-sized sheet-like Bi 2 MoO 6 3.2%: 96.8%.

[0030] One of the above CQDs / Bi 2 MoO 6 Composite photocatalyst preparation method specifically comprises the following steps:

[0031] (1), the Bi(NO 3 ) 3 ·5H 2 O is dissolved in nitric acid to obtain Bi(NO 3 ) 3 solution;

[0032] Na 2 MoO4 2H 2 O was dissolved in deionized water to obtain Na at a concentration of 0.05 mol / L 2 MoO 4 solution;

[0033] Then calculated by molar ratio, that is, Bi(NO 3 ) 3 Bi in solution 3+ : Na 2 MoO 4 MoO in solution 4 2- For a ratio of 2:1, the Bi(NO 3 ) 3 solution and Na 2 MoO 4 The solution was mixed evenly to obtain a light yellow suspension;

[0034] (2) Add the CQDs aqueous solution t...

Embodiment 2

[0042] The difference between this embodiment and embodiment 1 is only: CQDs and Bi 2 MoO 6 The mass ratio is 1%: 99%, and all the other contents are identical with those described in Example 1. Known through detection and analysis: the CQDs / Bi obtained by the present embodiment 2 MoO 6 The degradation rate of rhodamine B of the composite photocatalytic material under the same conditions as the composite material obtained in Example 1 was 80.7%.

Embodiment 3

[0044] The difference between this embodiment and embodiment 1 is only: CQDs and Bi 2 MoO 6 The mass ratio is 6%: 94%, and all the other contents are identical with those described in Example 1. Known through detection and analysis: the CQDs / Bi obtained by the present embodiment 2 MoO 6 The degradation rate of rhodamine B of the composite photocatalytic material under the same conditions as the composite material obtained in Example 1 was 76.8%.

technical field

[0001] The invention belongs to the field of materials science, and relates to a photocatalytic material, specifically a near-infrared response carbon quantum dot / Bi 2 MoO 6 Photocatalyst and preparation method. Background technique

[0002] Due to the increasing environmental pollution and energy crisis in the world, the research and application of semiconductor photocatalysis have attracted widespread attention. The core issue of photocatalytic technology is the design, development and development of suitable photocatalysts, especially the research on high-performance photocatalytic materials with wide spectral response has become a top priority. However, most of the currently developed photocatalytic materials can only absorb ultraviolet light or visible light, but cannot utilize near-infrared light and infrared light, which account for 53% of the solar spectrum. In recent years, researchers have discovered that carbon quantum dots (CQDs) have upconvers...

Examples

Embodiment 1

[0029] A CQDs / Bi 2 MoO 6 Composite photocatalyst consisting of 50-100nm nanosheet Bi 2 MoO 6 and 5-10nm carbon quantum dots, and the CQDs nanoparticles are distributed in the nanometer-sized sheet-like Bi 2 MoO 6 Above, calculated by mass percentage, CQDs of nanoparticles: nanometer-sized sheet-like Bi 2 MoO 6 3.2%: 96.8%.

[0030] One of the above CQDs / Bi 2 MoO 6 Composite photocatalyst preparation method specifically comprises the following steps:

[0031] (1), the Bi(NO 3 ) 3 ·5H 2 O is dissolved in nitric acid to obtain Bi(NO 3 ) 3 solution;

[0032] Na 2 MoO4 2H 2 O was dissolved in deionized water to obtain Na at a concentration of 0.05 mol / L 2 MoO 4 solution;

[0033] Then calculated by molar ratio, that is, Bi(NO 3 ) 3 Bi in solution 3+ : Na 2 MoO 4 MoO in solution 4 2- For a ratio of 2:1, the Bi(NO 3 ) 3 solution and Na 2 MoO 4 The solution was mixed evenly to obtain a light yellow suspension;

[0034] (2) Add the CQDs aqueous solution t...

Embodiment 2

[0042] The difference between this embodiment and embodiment 1 is only: CQDs and Bi 2 MoO 6 The mass ratio is 1%: 99%, and all the other contents are identical with those described in Example 1. Known through detection and analysis: the CQDs / Bi obtained by the present embodiment 2 MoO 6 The degradation rate of rhodamine B of the composite photocatalytic material under the same conditions as the composite material obtained in Example 1 was 80.7%.

Embodiment 3

[0044] The difference between this embodiment and embodiment 1 is only: CQDs and Bi 2 MoO 6 The mass ratio is 6%: 94%, and all the other contents are identical with those described in Example 1. Known through detection and analysis: the CQDs / Bi obtained by the present embodiment 2 MoO 6 The degradation rate of rhodamine B of the composite photocatalytic material under the same conditions as the composite material obtained in Example 1 was 76.8%.

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