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A preparation method of light-driven micro-robots for environmental restoration

A micro-robot and environmental restoration technology, applied in the field of engineering, can solve problems such as short life, achieve low cost, improve operating speed and environmental restoration efficiency, and improve visible light responsiveness and catalytic efficiency.

Active Publication Date: 2020-10-23
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This type of micro-robot makes up for the shortcomings of existing micro-robots for environmental protection that require additional "fuel" to provide power, short life and potential environmental hazards, and can minimize the damage of environmental inspection personnel and environmental protection costs.

Method used

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  • A preparation method of light-driven micro-robots for environmental restoration

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) First, disperse 3 g of pre-purchased polystyrene microspheres (1 μm in diameter) into a 0.5 mol / L aqueous solution of cetyltrimethylammonium bromide, sonicate for 10 minutes, and take them out to dry. The purpose of ultrasound is to activate the surface of the polystyrene microspheres.

[0028] Drop 12mL of 1.0mol / L titanium tetrachloride aqueous solution into 20mL of 5wt% ammonia water to produce a precipitate, wash the resulting precipitate with deionized water after centrifugation to pH=7, and then add excess mass to the precipitate The hydrogen peroxide with a concentration of 30% until the solution turns into an orange-yellow transparent liquid is a precursor with photocatalytic particles.

[0029] Next, add the polystyrene microspheres dried in step (1) into the orange transparent liquid, and react in a 250mL three-neck flask at 100°C for 8h. The product is washed, filtered, and vacuum-dried to obtain core-shell particles with photocatalytic properties. Spher...

Embodiment 2

[0034] (1) First, 6 g of pre-purchased polystyrene microspheres (4 μm in diameter) were dispersed in 100 mL of ethanol to obtain a solution containing polystyrene microspheres.

[0035] 100mL of absolute ethanol solution containing 1g of tetrabutyl titanate (that is, the precursor with photocatalytic particles) was added dropwise to the solution containing polystyrene microspheres to obtain a mixed solution;

[0036] Secondly, according to the molar ratio n (Fe) :n (Ti) Weigh ferric nitrate at a ratio of 1:100 and add it to the mixed solution, stir and react at 100°C for 2 hours, then add 5g of concentrated ammonia water (mass concentration is 25% to 28%), continue stirring for 3 hours, filter, wash with alcohol, and vacuum dry . The obtained product was calcined at 550 °C for 2 h to obtain iron-doped titanium dioxide hollow microspheres (Fe-TiO 2 ), which are spherical particles with a core-shell structure with photocatalytic particles. The ammoniacal liquor in this step ...

Embodiment 3

[0043] (1) Disperse 6g of the mixture of glucose, protein and cellulose in 35mL of deionized water and stir until evenly dispersed, then transfer to a 50mL reaction kettle, react at 185°C for 13h, and the product is centrifuged with absolute ethanol for several times and then vacuum Dry to obtain carbon microspheres.

[0044] Next, disperse the obtained carbon microspheres in 100 mL of an aqueous solution containing zinc acetate (0.5 mol / L) and titanium tetrachloride (0.1 mol / L) and sonicate until uniformly dispersed, then age for 24 h, and the product is washed with deionized water several times Vacuum drying after centrifugal cleaning; then the dried product was calcined at 500° C. for 1 h to obtain titanium atom-doped zinc oxide hollow microspheres (Ti-ZnO) with a mass fraction of titanium atom doping of 1.2%.

[0045] (2) First, place the Ti-ZnO obtained in the above step (1) on the surface of the aluminum foil, and fix it horizontally on the sample stage of the electron b...

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Abstract

A method for preparing light-driven microrobots for environmental remediation. The polymer inside the core-shell structure spherical particles is removed through a solvent method or a calcination method to obtain photocatalytic hollow structure microspheres; the photocatalytic hollow microspheres are After being added to a solution containing non-metals or metal ions for reaction, ion-doped photocatalytic hollow microspheres are produced; the ion-doped photocatalytic hollow microspheres are placed on the surface of the substrate, and then placed on the surface of the substrate. One or more functional layers are deposited on the hemispheric surface of the hollow microsphere, and then the substrate is peeled off. This type of robot can achieve self-drive and long-term operation under the influence of sunlight. Doping with non-metallic elements or metal ions can effectively narrow the band gap of particles with photocatalytic properties and improve the separation efficiency of photogenerated electrons and holes, thereby improving the visible light responsiveness and catalytic efficiency of microrobots and making them more effective. Visible light realizes the function of self-driven and photocatalytic degradation of organic pollutants.

Description

technical field [0001] The invention belongs to the technical fields of micro-nano machinery manufacturing, environmental monitoring, environmental restoration and the like, and in particular relates to a preparation method of a micro-robot driven by light for environmental restoration. Background technique [0002] The discharge of a large amount of toxic and harmful polluted water not only brings serious harm to surrounding organisms and environmental protection personnel, but also poses a serious threat to sustainable development and the water resource system on which human beings depend. The continuous deterioration of the water environment, the rapid growth of the population and the increase in the demand for clean water resources urgently require new technologies and solutions to protect the water resources that human beings rely on to ensure sustainable use and clean water resources. [0003] Nanomaterials and their technology have achieved considerable practical resu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/30B01J27/24B01J21/06B01J23/89B01J21/18B01J35/08
CPCC02F1/30B01J21/063B01J21/18B01J23/892B01J27/24C02F2305/10B01J35/39B01J35/51
Inventor 刘超马建中鲍艳冯昕钰
Owner SHAANXI UNIV OF SCI & TECH
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