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A fibrous z-shaped photocatalyst tio for treating organic sewage 2 /g-c 3 no 4 preparation method

A photocatalyst and organic sewage technology, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, energy wastewater treatment, etc., can solve the problems of potential safety hazards, easy agglomeration of composite materials, and no reports, etc., to broaden the space for photogenerated electrons Hole space distance, easy separation and recycling, and the effect of improving utilization efficiency

Active Publication Date: 2020-03-06
WUHAN POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the existing technologies use the solvothermal method, which is complex and uses a large amount of organic solvents or strong corrosive acid HF as catalysts. The prepared composite materials are easy to agglomerate, which requires high requirements for operators and has potential safety hazards.
In addition, the existing technology has not reported the use of electrospinning and in-situ crystallization and calcination to prepare fibrous Z-type photocatalyst TiO for the treatment of organic sewage. 2 / g -C 3 N 4 method report

Method used

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  • A fibrous z-shaped photocatalyst tio for treating organic sewage <sub>2</sub> /g-c <sub>3</sub> no <sub>4</sub> preparation method
  • A fibrous z-shaped photocatalyst tio for treating organic sewage <sub>2</sub> /g-c <sub>3</sub> no <sub>4</sub> preparation method
  • A fibrous z-shaped photocatalyst tio for treating organic sewage <sub>2</sub> /g-c <sub>3</sub> no <sub>4</sub> preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032]Add 9ml of methanol, 0.3ml of glacial acetic acid, 2ml of tetrabutyl titanate and 0.56g of polyvinylpyrrolidone to the Erlenmeyer flask in turn, stir for 3 hours to obtain a uniform spinning solution, and put the spinning solution into a plastic syringe with a stainless steel needle Carry out high-voltage electrospinning, the spinning voltage is 12kV, the receiving distance is 15cm, and the air humidity is 39%, to obtain tetrabutyl titanate / polyvinylpyrrolidone fiber membrane, put the composite fiber membrane into a temperature-programmed muffle furnace, and heat up The speed is set at 2°C / min, and calcined at 500°C for 2h to obtain porous TiO 2 Nanofibers.

[0033] Weigh the above porous TiO 2 Add 360 mg of nanofibers to 50 ml of distilled water, and ultrasonically grind the porous TiO 2 The nanofibers were crushed into short fibers and dispersed evenly in water, then 3 g of melamine was added, stirred by magnetic force and heated to 98 ° C, and the distilled water wa...

Embodiment 2

[0035] Add 8ml of methanol, 0.4ml of glacial acetic acid, 2ml of tetrabutyl titanate and 0.7g of polyvinylpyrrolidone to the Erlenmeyer flask in turn, and stir for 3.5h to obtain a uniform spinning solution. The syringe was subjected to high-voltage electrospinning, the spinning voltage was 12kV, the receiving distance was 15cm, and the air humidity was 35% to obtain a tetrabutyl titanate / polyvinylpyrrolidone fiber membrane, and the composite fiber membrane was placed in a temperature-programmed muffle furnace, The heating rate is set at 2°C / min, and calcined at 500°C for 2 hours to obtain porous TiO 2 Nanofibers.

[0036] Weigh the above porous TiO 2 Add 90 mg of nanofibers to 45 ml of distilled water, and ultrasonically grind the porous TiO 2 The nanofibers were crushed into short fibers and dispersed evenly in water, then 3.0 g of melamine was added, stirred by magnetic force and heated to 98 ° C, and the distilled water was evaporated to dryness, and the melamine in the ...

Embodiment 3

[0038] Add 7ml of methanol, 0.4ml of glacial acetic acid, 2.5ml of tetrabutyl titanate and 0.8g of polyvinylpyrrolidone to the Erlenmeyer flask in sequence, and stir for 3.5h to obtain a uniform spinning solution. High-voltage electrospinning was carried out with a plastic syringe, the spinning voltage was 14kV, the receiving distance was 14cm, and the air humidity was 35% to obtain tetrabutyl titanate / polyvinylpyrrolidone fiber membrane, and the composite fiber membrane was placed in a temperature-programmed muffle furnace , the heating rate was set at 2.5°C / min, and calcined at 500°C for 1.5h to obtain porous TiO 2 Nanofibers.

[0039] Weigh the above porous TiO 2 Add 180 mg of nanofibers to 45 ml of distilled water, and ultrasonically grind the porous TiO 2 The nanofibers were crushed into short fibers and dispersed evenly in water, then 4 g of melamine was added, magnetically stirred and heated to 99 ° C, and the distilled water was evaporated to dryness, and the melamin...

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Abstract

The invention belongs to the technical field of photocatalysts for the degradation of organic sewage, and specifically relates to a fibrous Z-type photocatalyst TiO for treating organic sewage. 2 / g‑C 3 N 4 preparation method. The photocatalyst is prepared by electrospinning and in-situ crystallization calcination. Specifically, the electrospinning method is used to prepare porous TiO. 2 Nanofiber; using water as solvent, melamine is precipitated in situ on porous TiO through in situ crystallization method 2 On the surface of short nanofibers, the fibrous Z-shaped photocatalyst TiO is obtained through a calcination process. 2 / g‑C 3 N 4 , this method is simple and can effectively solve g‑C 3 N 4 To solve the problems of agglomeration and low specific surface area, fibrous TiO with good morphology can be prepared by adjusting the amount of melamine. 2 / g‑C 3 N 4 Photocatalyst, Z-type catalyst effectively widens the spatial distance of photogenerated electron holes and inhibits the recombination of the two, thereby greatly improving the photocatalytic degradation efficiency. The one-dimensional fiber morphology is conducive to capturing sunlight, is easy to separate and recycle, and has relatively good recycling photocatalytic performance. good.

Description

technical field [0001] The invention belongs to the technical field of photocatalysts for organic sewage degradation, in particular to a fibrous Z-type photocatalyst TiO for treating organic sewage 2 / g -C 3 N 4 method of preparation. Background technique [0002] High-efficiency photocatalysts responsive to sunlight have been extensively studied for applications in sewage treatment and comprehensive utilization of solar energy. TiO 2 It is one of the common semiconductor materials, which has the advantages of good photoelectric performance, photocatalytic performance, good chemical stability, and non-toxicity, but its band gap is wide and can only be absorbed by a very small proportion of ultraviolet light in sunlight. Excited, it does not respond to visible light, which accounts for about 50% of sunlight, and photogenerated electrons and holes are easy to recombine. g-C 3 N 4 It is a non-metallic photocatalyst with strong visible light absorption, but the specific s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24C02F1/30C02F101/30
CPCC02F1/30B01J27/24C02F2101/30C02F2305/10B01J35/39Y02W10/37
Inventor 王春蕾闫俊涛李建芬柴波
Owner WUHAN POLYTECHNIC UNIVERSITY
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