Method capable of photocatalytically degrading dyes to prepare silver-loaded nano titanium dioxide PVP fiber in microfluidic mode

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

Active Publication Date: 2018-11-23

NANTONG TEXTILE & SILK IND TECH RES INST +1

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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=...

Abstract

The invention discloses a method capable of photocatalytically degrading dyes to prepare a silver-loaded nano titanium dioxide PVP fiber in a microfluidic mode. The method comprises the steps: addinga tetrabutyl titanate solution into an acid solution, mixing to form nano titanium dioxide gel, utilizing an organic solvent to mixing the nano titanium dioxide gel with amine terminated hyperbranchedpolymer to obtain mixed liquor, then adding a silver ion solution into the mixed liquor, drying to obtain silver-loaded nano titanium dioxide powder, mixing the silver-loaded nano titanium dioxide powder with PVP powder in the organic solvent to obtain a microfluidic spinning solution and spinning the microfluidic spinning solution into the silver-loaded nano titanium dioxide PVP fiber in a microfluidic mode. Catalytic fiber preparation in the method disclosed by the invention has a high material utilization rate, and the fiber has a large self catalyzing surface area and high catalytic activity, can effectively reduce dye concentration, can reduce toxic components in dye wastewater and can protect environment and water resources.

Application Domain

Water/sewage treatment by irradiationWater treatment compounds +2

Technology Topic

ChemistryTitanium dioxide +7

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Examples

Experimental program(4)

Example Embodiment

[0044] Example 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 of silver nitrate solution with a concentration of 0.08M, react for 20 minutes, transfer to a hydrothermal reaction kettle, and place in an electric blast drying oven at 170 degrees Celsius Heated for 6 hours, and after the reaction system was lowered to room temperature, washed the obtained precipitation with alcohol and water for 2 times, and centrifuged and dried to obtain a silver-loaded nano-TiO with a powder average particle size of 45nm, a silver molar content of 0.1954%, and a silver particle diameter of 4nm. powder.

[0047] Take 2g of PVP powder, 0.03g of silver-loaded nano-titanium dioxide powder and dissolve it in 10g of absolute ethanol, stir for 1.5h in a water bath at 20 degrees Celsius, and ultrasonically oscillate for 0.8h to make it evenly mixed as a microfluidic spinning solution.

[0048] Connect the focusing channel to the propulsion pump through the syringe, set the propulsion pump parameters, respectively set the syringe pump propulsion rate to 0.1ml/L, the motor propulsion frequency to 100HZ, the speed of the collection device to 100r, spin out fibers, and obtain fibers with a diameter of 15um after drying. The uniform silver-loaded nano-titanium dioxide PVP fibers with an interval of 360um.

Example Embodiment

[0049] Example 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 solution with a concentration of 0.12M, react for 40 minutes, transfer to a hydrothermal reaction kettle, and place in an electric blast drying oven at 220 degrees Celsius Heated for 10 hours, and after the reaction system was lowered to room temperature, the obtained precipitation was washed twice with alcohol and water, and dried by centrifugation to obtain a silver-loaded nanometer powder with an average particle size of 45nm, a silver molar content of 0.2067%, and a silver particle diameter of 3.8nm. TiO2 powder.

[0052] Take 2g of PVP powder and 0.07g of silver-loaded nano-titanium dioxide powder dissolved in 10g of absolute ethanol, stir for 2.5 hours in a water bath at 40 degrees Celsius, and ultrasonically oscillate for 1.5 hours to make it evenly mixed, as a microfluidic spinning solution.

[0053] Connect the focusing channel to the propulsion pump through a syringe, set the propulsion pump parameters, respectively set the syringe pump propulsion rate to 1ml/L, the motor propulsion frequency to 1000HZ, and the collection device to spin at a speed of 800r. The fiber is spun out and dried to obtain a diameter of 13um. PVP fibers of uniform silver-loaded nano-titanium dioxide at intervals of 400um.

Example Embodiment

[0054] Example 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 solution with a concentration of 0.11M, react for 35 minutes, transfer to a hydrothermal reaction kettle, and dry it with an electric blast at 190 degrees Celsius Heating in the oven for 8.5 hours, after the reaction system was down to room temperature, washed the precipitated alcohol twice with water, centrifuged and dried to obtain a powder with an average particle diameter of 42nm, a silver molar content of 0.20%, and a silver particle diameter of 3.3nm. Silver nano TiO2 powder.

[0057] Take 2.1g of PVP powder, 0.045g of silver-loaded nano-titanium dioxide powder and dissolve it in 9g of absolute ethanol, stir for 2.1h in a water bath at 28 degrees Celsius, and ultrasonically oscillate for 1.2h to make it evenly mixed as a microfluidic spinning solution .

[0058] Connect the focusing channel to the propulsion pump through the syringe, set the propulsion pump parameters, respectively set the syringe pump propulsion rate to 0.6ml/L, the motor propulsion frequency to 600HZ, and the collection device to spin at a speed of 500r. Spin out fibers and obtain fibers with a diameter of 10um after drying. PVP fibers with uniform silver-loaded nano-titanium dioxide at intervals of 300um.

PUM

Property	Measurement	Unit
Diameter	15.0	µm
Concentration	0.12	m
Diameter	3.8	nm

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Method capable of photocatalytically degrading dyes to prepare silver-loaded nano titanium dioxide PVP fiber in microfluidic mode

AI-Extracted Technical Summary

Problems solved by technology

Abstract

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Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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