A modified g-c 3 no 4 –sio 2 Heterojunction photocatalyst and preparation method thereof

A photocatalyst, g-c3n4 technology, applied in catalyst activation/preparation, organic compound/hydride/coordination complex catalyst, physical/chemical process catalyst, etc., can solve the problem of limiting the enrichment effect of pollutants in water, adsorbent It is not easy to add too much, which is not conducive to the photocatalytic reaction, etc., and achieves the effects of high practical value and application prospects, simple preparation method, and easy availability of raw materials.

CN107649177BActive Publication Date: 2020-03-17JIANGSU UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2020-03-17

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Abstract

The modified g-C disclosed by the present invention 3 N 4 – SiO 2 The preparation method of the heterojunction photocatalyst is as follows: g‑C 3 N 4 , and then prepare g‑C by sol‑hydrothermal method 3 N 4 / SiO 2 Coupling system, and then covalently grafted thiourea molecules on SiO under the action of dehydrating agent 2 surface, while promoting the SiO 2 with g‑C 3 N 4 The formation of inter-Si-N heterogeneous chemical bonds, the preparation method of the present invention have easy-to-obtain raw materials, low cost, mild reaction conditions and no pollution to the environment, and have good application prospects.
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Description

technical field

[0001] The invention relates to the field of semiconductor photocatalysts, in particular to a modified g-C 3 N 4 – SiO 2 Heterojunction photocatalyst and preparation method thereof. Background technique

[0002] With the development of modern industry, a large amount of waste water containing heavy metal ions is discharged into the water body. The problem of heavy metal pollution in my country's water is very serious. The pollution of rivers, lakes and reservoirs is serious, and the heavy metal pollution rate is over 80%. Heavy metal ions in water can stay for a long time and accumulate in the environment, enriched step by step through the food chain, seriously affecting the safety of humans and other organisms. Among them, Cr in the hexavalent state is commonly found in electroplating, printing and dyeing, and tanning wastewater, which is highly carcinogenic and teratogenic, and has persistent danger to the environment. Traditional Cr(VI) treatment metho...

Examples

Embodiment 1

[0030] Embodiment 1 modified g-C 3 N 4 – SiO 2 Preparation of Heterojunction Photocatalysts

[0031] (1) Put 30g of melamine in a tube furnace and calcinate at 500°C for 4 hours in an air atmosphere to obtain g-C 3 N 4 .

[0032] (2) Mix 8 mL of ethyl silicate and 40 mL of absolute ethanol, and add 1 g of g-C prepared in the above steps 3 N 4 , configured as A mixed solution; 6mL of HNO with a concentration of 1mol / L 3 , 2mL of HF with a volume concentration of 3% and 12mL of absolute ethanol were mixed to form a mixed solution of B; while stirring, the mixed solution of B was added to the mixed solution of A to form a sol; After 24 hours of reaction, the cooled product was filtered and separated, and the separated solid matter was washed and dried to obtain g-C 3 N 4 / SiO 2 catalyst of light.

[0033] (3) 2g of g-C prepared in the above steps 3 N 4 / SiO 2 Add it to 100mL of absolute ethanol, then add 3g of thiourea, stir and mix evenly, then add 2g of dicyclohex...

Embodiment 2

[0034] Embodiment 2 modified g-C 3 N 4 – SiO 2 Preparation of Heterojunction Photocatalysts

[0035] (1) Put 30g of melamine in a tube furnace and calcinate at 550°C for 4 hours in an air atmosphere to obtain g-C 3 N 4 .

[0036] (2) Mix 8 mL of ethyl silicate and 40 mL of absolute ethanol, and add 2 g of g-C prepared in the above steps 3 N 4 , configured as A mixed solution; 8mL of HNO with a concentration of 1mol / L 3 , 3mL of HF with a volume concentration of 3% and 12mL of absolute ethanol were mixed to form a mixed solution of B; while stirring, the mixed solution of B was added to the mixed solution of A to form a sol; After 24 hours of reaction, the cooled product was filtered and separated, and the separated solid matter was washed and dried to obtain g-C 3 N 4 / SiO 2 catalyst of light.

[0037] (3) 2g of g-C prepared in the above steps 3 N 4 / SiO 2 Add to 120mL of absolute ethanol, then add 4g of thiourea, stir and mix evenly, then add 3g of dicyclohexylc...

Embodiment 3

[0038] Embodiment 3 modified g-C 3 N 4 – SiO 2 Preparation of Heterojunction Photocatalysts

[0039] (1) Put 30g of melamine in a tube furnace and calcinate at 550°C for 5 hours in an air atmosphere to obtain g-C 3 N 4 .

[0040] (2) Mix 8 mL of ethyl silicate and 40 mL of absolute ethanol, and add 2 g of g-C prepared in the above steps 3 N 4 , configured as A mixed solution; 10mL of HNO with a concentration of 1mol / L 3 , 4mL of HF with a volume concentration of 3% and 12mL of absolute ethanol were mixed to form a mixed solution of B; while stirring, the mixed solution of B was added to the mixed solution of A to form a sol; After 30 hours of reaction, the cooled product was filtered and separated, and the separated solid matter was washed and dried to obtain g-C 3 N 4 / SiO 2 catalyst of light.

[0041] (3) 2g of g-C prepared in the above steps 3 N 4 / SiO 2 Add it to 120mL of absolute ethanol, then add 6g of thiourea, stir and mix evenly, then add 4g of dicyclohe...