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A kind of floating on water containing ag 3 po 4 and carboxylated g-c 3 n 4 The preparation method of the hydrogel photocatalytic film

A water surface floating, photocatalytic film technology, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problem that photocatalytic carriers are difficult to float on the water surface, photocatalysts are easy to lose, and photocatalysts are difficult to repeat Application and other issues

Active Publication Date: 2022-07-01
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the deficiencies of the prior art, the technical problems to be solved by the present invention are that photocatalysts are difficult to be used repeatedly in practice, photocatalysts are easy to be lost, photocatalytic carriers are difficult to float on the water surface, etc.
[0008] The technical scheme of the present invention to solve the problems that the photocatalyst is difficult to be used repeatedly in practice, the photocatalyst is easy to lose, and the photocatalyst carrier is difficult to float on the water surface is to provide a water surface floating Ag containing 3 PO 4 and carboxylated g-C 3 N 4 Preparation method of hydrogel photocatalytic film

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] a) Use a mixed aqueous solution of potassium dichromate and sulfuric acid to test g-C 3 N 4 undergo chemical oxidation, at g-C 3 N 4 Introduce hydroxyl and carboxyl groups on the basal plane to further improve g-C 3 N 4 Carboxyl group content on the surface, g-C after chemical oxidation 3 N 4 Reaction with chloroacetic acid to form carboxylated g-C 3 N 4 , centrifuged and washed to remove residual inorganic salts and acids, freeze-dried to obtain carboxylated g-C 3 N 4Solid powder; control the concentration of chloroacetic acid, reaction temperature and reaction time to make carboxylated g-C 3 N 4 The mass percentage content of the carboxyl group is 0.1%;

[0020] b) Carboxylated g-C obtained in step a) 3 N 4 The solid powder is dispersed in deionized water, the pH value is adjusted to be weakly alkaline, and the carboxylated g-C is carboxylated by ultrasound. 3 N 4 Disperse uniformly in water to control carboxylated g-C 3 N 4 The mass percentage concen...

Embodiment 2

[0026] a) Use a mixed aqueous solution of potassium dichromate and sulfuric acid to test g-C 3 N 4 undergo chemical oxidation, at g-C 3 N 4 Introduce hydroxyl and carboxyl groups on the basal plane to further improve g-C 3 N 4 Carboxyl group content on the surface, g-C after chemical oxidation 3 N 4 Reaction with chloroacetic acid to form carboxylated g-C 3 N 4 , centrifuged and washed to remove residual inorganic salts and acids, freeze-dried to obtain carboxylated g-C 3 N 4 Solid powder; control the concentration of chloroacetic acid, reaction temperature and reaction time to make carboxylated g-C 3 N 4 The mass percentage content of the carboxyl group is 3%;

[0027] b) Carboxylated g-C obtained in step a) 3 N 4 The solid powder is dispersed in deionized water, the pH value is adjusted to be weakly alkaline, and the carboxylated g-C is carboxylated by ultrasound. 3 N 4 Disperse uniformly in water to control carboxylated g-C 3 N 4 The mass percentage concent...

Embodiment 3

[0033] a) Use a mixed aqueous solution of potassium dichromate and sulfuric acid to test g-C 3 N 4 undergo chemical oxidation, at g-C 3 N 4 Introduce hydroxyl and carboxyl groups on the basal plane to further improve g-C 3 N 4 Carboxyl group content on the surface, g-C after chemical oxidation 3 N 4 Reaction with chloroacetic acid to form carboxylated g-C 3 N 4 , centrifuged and washed to remove residual inorganic salts and acids, freeze-dried to obtain carboxylated g-C 3 N 4 Solid powder; control the concentration of chloroacetic acid, reaction temperature and reaction time to make carboxylated g-C 3 N 4 The mass percentage content of the carboxyl group is 5%;

[0034] b) Carboxylated g-C obtained in step a) 3 N 4 The solid powder is dispersed in deionized water, the pH value is adjusted to be weakly alkaline, and the carboxylated g-C is carboxylated by ultrasound. 3 N 4 Disperse uniformly in water to control carboxylated g-C 3 N 4 The mass percentage concent...

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Abstract

The invention discloses a kind of Ag-containing floating on the water surface 3 PO 4 and carboxylated g‑C 3 N 4 Preparation method of hydrogel photocatalytic film. First for g‑C 3 N 4 Chemical oxidation is carried out to generate hydroxyl and carboxyl groups on its basal plane, in order to further improve g-C 3 N 4 Carboxyl group content on the surface, g‑C after chemical oxidation 3 N 4 Reaction with chloroacetic acid to obtain carboxylated g-C 3 N 4 . Carboxylated g-C 3 N 4 Fully disperse into water, add silver nitrate to fully adsorb silver ions to carboxylated g‑C 3 N 4 surface, followed by addition of excess soluble phosphate to carboxylate g‑C 3 N 4 Ag generated on the surface 3 PO 4 Nanoparticles. Next, soluble carbonate and sodium alginate are added to the system and fully dissolved to obtain a casting solution. The casting solution is scraped into a film and immersed in a mixed aqueous solution of dilute hydrochloric acid and soluble calcium salt to fully react. Hydrochloric acid and soluble carbonic acid When the salt reacts to generate carbon dioxide bubbles, calcium ions are cross-linked to form calcium alginate hydrogels, so that the carbon dioxide bubbles are enclosed in the hydrogel to obtain a floating surface containing Ag. 3 PO 4 and carboxylated g‑C 3 N 4 hydrogel photocatalytic film.

Description

technical field [0001] The invention relates to a kind of Ag-containing floating on the water surface 3 PO 4 and carboxylated g-C 3 N 4 A preparation method of the hydrogel photocatalytic membrane belongs to the field of functional materials and membrane separation. [0002] The present invention relates to Ag 3 PO 4 , g-C 3 N 4 , hydrogels and photocatalysis. In particular, it relates to a kind of Ag-containing floating on the water surface. 3 PO 4 and carboxylated g-C 3 N 4 The preparation method of the hydrogel photocatalytic film. Background technique [0003] Environmental pollution has become an important problem that needs to be solved urgently in the current sustainable development. In recent years, photocatalytic technology based on semiconductor materials has become the greenest and most effective new technology to solve environmental pollution because it can effectively use solar energy conversion to control environmental pollution. The research and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24B01J35/02B01J35/00
CPCB01J27/24B01J35/00B01J35/30B01J35/39
Inventor 赵孔银郭智龙张静雯莫琛童宇鑫刘雪芳程蒙蒙于黎楠杨文栋
Owner TIANJIN POLYTECHNIC UNIV