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A method of photodegrading dye microfluidics to prepare silver-loaded nano-titanium dioxide pvp fibers

A nano-titanium dioxide and photodegradation technology is applied in the field of preparation of photocatalytic degradation materials, which can solve the problems of high probability of electron-hole recombination, insufficient catalytic performance, and inability to collect nano-powders, etc., so as to improve the photocatalytic activity and promote the Photocatalytic activity, the effect of reducing toxic components

Active Publication Date: 2021-07-13
NANTONG TEXTILE & SILK IND TECH RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] (3) The chromium, lead, mercury, arsenic, zinc and other heavy metal salts in the heavy metal wastewater in the dye cannot be biodegraded, they can exist in the natural environment for a long time, and will continue to pass through the food chain and accumulate in the human body
[0007] (4) The content of organic matter in wastewater is high, the composition is complex, and the content of harmful substances is high
However, pure nanometer titanium dioxide semiconductor material also has some shortcomings as a catalyst: firstly, it has a wide band gap (Eg=3.2ev), which can only absorb ultraviolet light with a wavelength less than 387nm, and is not suitable for visible light, which accounts for most of the sunlight. Second, the recombination probability of electrons and holes is high, and the effective photon survival time is short and the number is small, so that nano-titanium dioxide cannot fully exert its catalytic properties.
Silver-loaded nano-TiO2 powder is an efficient photocatalytic product, but due to its poor hydrophilicity, the nano-powder cannot be collected and it is difficult to be directly applied

Method used

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  • A method of photodegrading dye microfluidics to prepare silver-loaded nano-titanium dioxide pvp fibers
  • A method of photodegrading dye microfluidics to prepare silver-loaded nano-titanium dioxide pvp fibers
  • A method of photodegrading dye microfluidics to prepare silver-loaded nano-titanium dioxide pvp fibers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Weigh 8g of tetrabutyl titanate and add 30ml of absolute ethanol, ultrasonically oscillate for 8 minutes, as solution A; measure 8ml of deionized water and 8ml of glacial acetic acid, add 30ml of absolute ethanol as solution B, put them into a three-neck flask, Stir in a 15°C water bath. Pour liquid A into the constant pressure funnel, and slowly drop into liquid B by adjusting the switch. This process lasts for about 1.5 hours, during which the solution gradually turns blue. After the dripping is finished, continue to stir for 30 minutes, then transfer to a petri dish, and let it stand until a gel is formed.

[0046] Take by weighing 8g of the prepared nano-titanium dioxide gel and put it into a three-necked flask, take the 80g / L amino-terminated hyperbranched polymer (HBP-NH2) 3ml and 47ml of absolute ethanol prepared in the laboratory for proportioning and mixing and transfer Put it into a constant pressure funnel, degumming at 15 degrees Celsius, then add 0.120ml o...

Embodiment 2

[0050] Weigh 10g of tetrabutyl titanate and add 40ml of absolute ethanol, ultrasonically oscillate for 12 minutes, as solution A; measure 12ml of deionized water and 12ml of glacial acetic acid, add 40ml of absolute ethanol as solution B, put it into a three-necked flask, and Stir in a 25°C water bath. Pour liquid A into the constant pressure funnel, and adjust the switch to slowly drip into liquid B. This process lasts for about 2.5 hours, during which the solution gradually turns blue. After dripping, continue to stir for 50 minutes, then transfer to a petri dish and let it stand until a gel is formed.

[0051] Weigh 12g of the prepared nano-titanium dioxide gel and put it into a three-necked flask, take the 120g / L amino-terminated hyperbranched polymer (HBP-NH2) 5ml and 45ml of absolute ethanol prepared in the laboratory for proportioning and mixing and transfer Put it into a constant pressure funnel, degumming at 25 degrees Celsius, then add 0.150ml of silver nitrate solu...

Embodiment 3

[0055] Weigh 9g of tetrabutyl titanate and add 36ml of absolute ethanol, ultrasonically oscillate for 11 minutes, as solution A; measure 9ml of deionized water and 9ml of glacial acetic acid, add 37ml of absolute ethanol as solution B, put them into a three-neck flask, Stir in a water bath at 22°C. Pour liquid A into the constant pressure funnel, and slowly drop it into liquid B by adjusting the switch. This process lasts for about 2.2 hours, during which the solution gradually turns blue. After dripping, continue to stir for 45 minutes, then transfer to a petri dish and let it stand until a gel is formed.

[0056] Weigh 9g of the prepared nano-titanium dioxide gel and put it into a three-necked flask, take the 105g / L amino-terminated hyperbranched polymer (HBP-NH2) 4.5ml and 45.5ml of absolute ethanol prepared in the laboratory for proportioning and mixing And transfer it to a constant pressure funnel, degumming at 22 degrees Celsius, then add 0.140ml of silver nitrate solut...

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Abstract

The invention discloses a method for preparing silver-loaded nano-titanium dioxide PVP fibers by photodegrading dye microfluidics. The tetrabutyl titanate solution is added to an acidic solution to form a nano-titanium dioxide gel, and an organic solvent is used to form a nano-titanium dioxide gel. Mix with amino-terminated hyperbranched polymer to obtain a mixed solution, then add silver ion solution to the mixed solution, and obtain silver-loaded nano-titanium dioxide powder after drying, mix silver-loaded nano-titanium dioxide powder and PVP powder in an organic solvent to obtain a microfluidic spinning Silk liquid, the microfluidic spinning liquid is spun into silver-loaded nano-titanium dioxide PVP fibers by microfluidic control. The preparation of the catalytic fiber in the present invention has high utilization rate of materials, large catalytic surface area and high catalytic activity of the fiber itself, can effectively reduce the concentration of dyes, reduce toxic components in dye wastewater, and protect the environment and water resources.

Description

technical field [0001] The invention relates to a preparation method of a photocatalytic degradation material, in particular to a method capable of photodegrading dye microfluids to prepare silver-loaded nano-titanium dioxide PVP fibers. Background technique [0002] The continuous development of society promotes the development of the chemical industry, but industrial wastewater is also increasing in the process of development. Dye wastewater is one of the main harmful industrial wastewater, which mainly comes from the production industry of dyes and dye intermediates. It is composed of the mother liquor of crystallization of various products and intermediates, materials lost during the production process, and sewage from washing the ground. With the continuous growth of the dye industry, its production wastewater has become a major source of water pollution. A large number of pollutants are produced in the process of dye production, such as sulfonation, nitration, diazoti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/38B01J35/00B01J35/06B01J35/10C02F1/30C02F101/30
CPCB01J31/38B01J35/004B01J35/06B01J35/1004C02F1/30C02F2101/308C02F2305/10
Inventor 张雨凡林红陈宇岳付凡左琴平张德锁
Owner NANTONG TEXTILE & SILK IND TECH RES INST
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