Preparation method and application of a composite photocatalytic nanomotor

A photocatalytic and composite technology, applied in the direction of catalyst activation/preparation, chemical instruments and methods, organic compound/hydride/coordination complex catalysts, etc., can solve the large demand for flocculants, secondary pollution, and internal control of nanomotors and limited external control methods to achieve good adsorption effect, high adsorption rate, and increased adsorption specific surface area

Active Publication Date: 2021-10-29
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The flocculation and sedimentation method has a good encapsulation of bacteria, which is mainly removed by flocculating with bacteria into larger particles, but the demand for flocculants is relatively large; the chemical oxidation method is mainly photocatalytic oxidation and sterilization, which destroys the structure of bacteria and makes them inactive. Bromide needs to be introduced; membrane biological treatment mainly uses hollow fiber membranes for filtration and dialysis, but large doses of disinfectants are required to remove viruses during membrane biological treatment, which is prone to produce harmful disinfection by-products; among them, reverse osmosis technology can remove Most types and quantities of viruses, but reverse osmosis technology requires huge operating pressure; water after ultraviolet treatment is easy to cause secondary pollution during transportation
[0004] As a micro-scale controllable purification subject, nanomotors can be used in various fields, especially in the delivery of medicines and media. However, due to the limited internal and external control methods of nanomotors, they are rarely used in the field of water treatment. Especially in the study of virus adsorption in water, there is still a lack of technology to purify water using nanomotor devices combined with charged materials-carbon nanometers (CNTs) composite materials.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1: The preparation method of this composite photocatalytic nanomotor is as follows:

[0022] (1) After mixing multi-walled carbon nanotubes with acid, ultrasonically treat them for at least 4 hours, filter, wash the solid with water until neutral, and dry at 100°C for 12 hours to obtain acidified multi-walled carbon nanotubes, where acid is the mass concentration 98% concentrated sulfuric acid;

[0023] (2) Mix the acidified multi-walled carbon nanotubes with ethanol (98%) to prepare a suspension with a concentration of 0.01mol / L, and add nano-aluminum, nano-silver, nano-silica sol, and polytetrafluoroethylene to the suspension in sequence , after ultrasonication and oscillation for about 1 hour, filter, wash the solid with distilled water for 6 times, and dry it with nitrogen blowing at room temperature to obtain CNTs-Ag-Al-PTFE; the addition amounts of nano-aluminum and nano-silver are respectively the mass of multi-walled carbon nanotubes 2%, the volume r...

Embodiment 2

[0027] Embodiment 2: The preparation method of this composite photocatalytic nanomotor is as follows:

[0028] (1) After mixing the multi-walled carbon nanotubes with acid, sonicate for at least 4 hours, filter, wash the solid with water until neutral, and dry at 120°C for 12 hours to obtain acidified multi-walled carbon nanotubes, wherein the concentration of acid is 6 mol / L concentrated hydrochloric acid;

[0029] (2) Mix the acidified multi-walled carbon nanotubes with ethanol (90%) to prepare a suspension with a concentration of 0.03mol / L, and add nano-aluminum, nano-silver, nano-silica sol, and polytetrafluoroethylene to the suspension in sequence , after ultrasonication and vibration for about 0.5h, filter, wash the solid with distilled water for 8 times, and dry it with nitrogen at room temperature to obtain CNTs-Ag-Al-PTFE; the addition amount of nano-aluminum and nano-silver is respectively multi-walled carbon nanotubes 5% of the mass, the volume ratio of nano-silica...

Embodiment 3

[0033] Embodiment 3: The preparation method of this composite photocatalytic nanomotor is as follows:

[0034] (1) After mixing the multi-walled carbon nanotubes with acid, sonicate for at least 4 hours, filter, wash the solid with water until neutral, and dry at 150°C for 12 hours to obtain acidified multi-walled carbon nanotubes, where the acid is concentrated sulfuric acid - concentrated nitric acid mixture, the mixture is prepared by mixing concentrated sulfuric acid and concentrated nitric acid in a volume ratio of 2:1;

[0035] (2) Mix the acidified multi-walled carbon nanotubes with ethanol (95%) to prepare a suspension with a concentration of 0.05mol / L. Add nano-aluminum, nano-silver, nano-silica sol, and polyethylene to the suspension in sequence, and ultrasonically , After shaking for about 0.8h, filter, wash the solid with distilled water for 10 times, and dry it with nitrogen at room temperature to obtain CNTs-Ag-Al-PTFE; the addition of nano-aluminum and nano-silv...

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Abstract

The invention discloses a preparation method of a composite photocatalytic nanomotor. After mixing multi-walled carbon nanotubes with acid, ultrasonic treatment is performed to obtain acidified multi-walled carbon nanotubes; the acidified multi-walled carbon nanotubes are Mix it with ethanol to prepare a suspension, add nano-aluminum, nano-silver, nano-silica sol, and polytetrafluoroethylene to the suspension in sequence, ultrasonically and oscillate to obtain CNTs-Ag-Al-PTFE, and finally add copper oxide, aluminum oxide, Mix hydrochloric acid evenly to prepare a mixed solution, add CNTs-Ag-Al-PTFE to the mixed solution, stir and react at room temperature, centrifuge, wash, disperse the solid in distilled water, irradiate with a high-pressure mercury lamp, and then add hydrogen peroxide ‑Nano-silica sol mixture, stirred at room temperature, separated, washed, dried and ground to obtain a composite photocatalytic nanomotor. The method of the invention has a simple preparation process and is easy to operate. The prepared material can effectively remove water in wastewater treatment harmful microorganisms in.

Description

technical field [0001] The invention belongs to the field of nanomotor material environmental water body treatment, and specifically relates to a preparation method of a composite photocatalytic nanomotor and its application in removing water body microorganisms. Background technique [0002] Various pathogenic viruses and bacteria in water not only pollute the environment, but also threaten human health. Pathogenic viruses such as hepatitis virus, adenovirus, coliphage and enterovirus can cause harm to human health. At the same time, pathogenic bacteria in water such as Escherichia coli, Salmonella and other infections can easily lead to diarrhea, enteritis, meningitis and other diseases that seriously threaten human health, so the removal of pathogenic factors in water is imminent. [0003] Due to the wide variety of pathogenic factors in water bodies, viruses have no cell structure and obligately parasitize living sensitive hosts. Most viruses with a diameter of 20-200nm...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/08B01J31/28B01J37/34C02F101/20
CPCB01J31/28B01J35/004B01J35/023B01J37/344C02F1/32C02F1/48C02F1/505C02F2101/20C02F2103/003C02F2303/04C02F2305/10
Inventor 瞿广飞梁率钰杨聪庆杨灿葛睿
Owner KUNMING UNIV OF SCI & TECH
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