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Fish scale tubular carbon nitride composite heterojunction photocatalyst as well as preparation method and application thereof

A composite heterojunction and photocatalyst technology, applied in physical/chemical process catalysts, chemical instruments and methods, peroxides/peroxyhydrates/peroxyacids/superoxides/ozonides, etc., can solve light absorption Weak ability, no fish scale tubular carbon nitride, difficult to effectively degrade organic pollutants in water, etc., to achieve the effect of complete and uniform self-assembly, excellent photoelectrochemical performance, and strong visible light absorption ability

Active Publication Date: 2021-06-08
HUNAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in previous studies, the photocatalysts used for photocatalytic degradation still have the following problems: low light utilization efficiency, fast photogenerated electron-hole recombination, poor photocatalytic performance, and poor stability. Greatly limit the wide application of photocatalytic degradation
However, the existing carbon nitride-based composite heterojunction photocatalytic materials still have shortcomings such as weak light absorption ability, slow photogenerated electron-hole separation rate, and poor photocatalytic activity. It is difficult to effectively degrade organic pollutants in water bodies, and it is also not conducive to Improving the production of hydrogen peroxide, thus limiting the wide application of carbon nitride-based composite heterojunction photocatalytic materials in the field of photocatalysis
In addition, the surface of the existing tubular carbon nitride is flat and relatively smooth, which is not conducive to the stable loading of other heterojunction materials, so it is difficult to construct a tubular carbon nitride-based heterojunction material with stable performance. Carbon nitride also has shortcomings such as uneven structure, weak structure, small specific surface area, weak light absorption ability, easy recombination of photogenerated electrons and holes, and poor photocatalytic performance. The existence of these shortcomings greatly limits the use of tubular carbon nitride as a The wide application of carrier materials in the construction of heterojunction composite materials is difficult to meet the needs of the field of photocatalysis
In addition, so far, there have been no relevant reports on the preparation of fish scale tubular carbon nitride

Method used

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  • Fish scale tubular carbon nitride composite heterojunction photocatalyst as well as preparation method and application thereof
  • Fish scale tubular carbon nitride composite heterojunction photocatalyst as well as preparation method and application thereof
  • Fish scale tubular carbon nitride composite heterojunction photocatalyst as well as preparation method and application thereof

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Embodiment 1

[0059] A fish-scale tubular carbon nitride composite heterojunction photocatalyst, with the fish-scale tubular carbon nitride as the skeleton, and the surface of the fish-scale tubular carbon nitride is modified with ZnIn 2 S 4 , where ZnIn 2 S 4 The mass percentage content is 2%.

[0060] In this embodiment, the fish scale tubular carbon nitride is a tubular structure, and the surface is composed of fish scales; ZnIn 2 S 4 It is a flower-shaped spherical structure.

[0061] A method for preparing the fish scale tubular carbon nitride composite heterojunction photocatalyst in the above-mentioned embodiment, comprising the following steps:

[0062] (1) Add 1.08 g of melamine and 1.41 g of thiocyanuric acid into 50 mL of dimethyl sulfoxide, respectively, to obtain a melamine solution and a thiocyanuric acid solution.

[0063] (2) Mix the melamine solution and thiocyanic acid solution obtained in step (1), and magnetically stir at 600 rpm for 4 hours at 30° C. to obtain a y...

Embodiment 2

[0086] An application of a fish scale tubular carbon nitride composite heterojunction photocatalyst in the removal of organic pollutants in water, specifically using fish scale tubular carbon nitride composite heterojunction photocatalyst to catalyze the removal of tetracycline hydrochloride in water, including the following step:

[0087] Get the fish scale tubular carbon nitride composite heterojunction photocatalyst (2%ZnIn 2 S 4 / FTCN so , 5% ZnIn 2 S 4 / FTCN so , 10% ZnIn 2 S 4 / FTCN so , 50% ZnIn 2 S 4 / FTCN so , 90% ZnIn 2 S 4 / FTCN so , 95% ZnIn 2 S 4 / FTCN so ), fish scale tubular carbon nitride (FTCN so ), the ZnIn prepared in Comparative Example 1 2 S 4 , tubular carbon nitride (TCN) made in comparative example 2 iso ) and original carbon nitride (g-C 3 N 4 ), each took 25 mg, respectively added to 50 mL of tetracycline hydrochloride (TCH) solution (the initial pH value of the solution was 6.85) with a concentration of 10 mg / L, mixed evenly, an...

Embodiment 3

[0100] Investigate the stability of fish scale tubular carbon nitride composite heterojunction photocatalyst, including the following steps:

[0101] (1) get the fish scale tubular carbon nitride photocatalyst (5%ZnIn) that makes in 50mg embodiment 1 2 S 4 / FTCN so ) was added to 50mL tetracycline hydrochloride (TCH) solution with a concentration of 10mg / L (the initial pH value of the solution was 6.85), mixed evenly, and TCH was adsorbed at 30°C and 600rpm, and the adsorption equilibrium was reached after 30min ; Place the mixed solution that has reached adsorption equilibrium under a xenon lamp (λ>420nm, power 50W), and conduct a photocatalytic reaction at 30°C and 600rpm for 30min to complete the treatment of TCH.

[0102] (2) After the treatment in step (1) is completed, centrifuge the mixed solution obtained after the degradation at 6000rpm, remove the supernatant obtained by centrifugation, add 80mL, a concentration of 10mg / L TCH solution, and step ( 1) Repeat the tre...

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Abstract

The invention discloses a fish scale tubular carbon nitride composite heterojunction photocatalyst as well as a preparation method and application thereof. The catalyst takes fish scale tubular carbon nitride as a framework, and the surface of the catalyst is modified with ZnIn2S4 with the mass percentage of less than or equal to 50%. The preparation method comprises the following steps of sequentially adding ZnCl2, InCl3 and thioacetamide into a suspension of fish scale tubular carbon nitride and water, and carrying out hydrothermal reaction on an obtained precursor solution to obtain the catalyst. The fish scale tubular carbon nitride composite heterojunction photocatalyst has the advantages of strong light absorption capability, low photo-induced electron-hole recombination rate, good photocatalytic performance, good stability and the like, is a novel carbon nitride photocatalytic material, can be widely used for photocatalytic removal of organic pollutants and preparation of H2O2, has a good application prospect. The preparation method has the advantages of simple process, easily controllable conditions, low cost and the like, is suitable for large-scale industrial production, and is beneficial to industrial application.

Description

technical field [0001] The invention relates to a carbon nitride composite heterojunction photocatalyst and its preparation method and application, in particular to a fish scale tubular carbon nitride composite heterojunction photocatalyst and its preparation method and the fish scale tubular carbon nitride composite Heterojunction photocatalysts in removing antibiotics or producing H in water 2 o 2 in the application. Background technique [0002] With the rapid development of the economy, environmental and energy issues have become urgent problems to be solved. Antibiotic drugs have been widely used, and their excessive use and incomplete metabolism make antibiotics often detected in natural water, sewage, soil and other environmental media. These antibiotics that have not been metabolized are likely to affect the development of biological cells, ecosystems cycle and promote the reproduction of drug-resistant pathogenic bacteria, thereby adversely affecting the ecologic...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J35/02C01B15/029C02F1/30C02F101/30C02F101/34C02F101/36C02F101/38
CPCB01J27/24C02F1/30C01B15/029C02F2305/10C02F2101/308C02F2101/36C02F2101/38C02F2101/34B01J35/00B01J35/30B01J35/39
Inventor 刘智峰梁清华邵彬彬汤琳刘洋程敏何清云吴婷潘园童设华
Owner HUNAN UNIV
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