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La2O3-CdS photo-anode composite with photoinduced cathode protection performance

A cathodic protection and composite material technology, which is applied in nanotechnology, rare earth metal compounds, inorganic chemistry, etc. for materials and surface science, can solve the problem of reducing the utilization rate of photogenerated electrons, visible light cannot be fully utilized, and metal cathodic protection cannot be achieved. problems, to achieve the effects of improving practicability and applicability, improving photocatalytic activity, high charge separation and transfer efficiency

Inactive Publication Date: 2020-01-10
莫林祥
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Photoelectrochemical cathodic protection is to use green and clean solar energy to slow down and inhibit the corrosion of metal materials. The n-type semiconductor photoanode provides photogenerated electrons for metals to achieve cathodic protection. At present, the semiconductors used for photocathode protection mainly include TiO 2 , SrTiO 3 etc., however, the ultraviolet light that these semiconductors respond to with a wide bandgap only accounts for 5% of sunlight, most of the visible light cannot be fully utilized, and metals cannot be effectively cathodically protected. In addition, these semiconductors will generate photogenerated electrons and space The reorganization of holes reduces the utilization rate of photogenerated electrons

Method used

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preparation example Construction

[0022] To achieve the above object, the present invention provides the following technical solutions: a La 2 o 3 -CdS photocathode protection photoanode composite material, including the following raw materials in parts by weight, 20-25 parts of sodium sulfide, 30-35 parts of cadmium chloride, 2-5 parts of dilute hydrochloric acid, 30-45 parts of seven Lanthanum chloride water, 3-5 parts of ammonia water, Na in sodium sulfide 2The mass fraction of S is 95.2-97.4%, the molecular formula of cadmium chloride is CdCl, wherein the mass fraction of CdCl is 92.4-94.7%, the molar concentration of dilute hydrochloric acid is 5.14-5.51mol / L, and the mass fraction is 17.2-18.6%. The molecular formula of lanthanum chloride is LaCl 3 ·7H 2 O, where LaCl 3 The mass fraction is 80.5-82.2%, and the ammonia water is NH with a concentration of 21.3-22.6%. 3 ·H 2 O solution, a La 2 o 3 -The photoanode composite material of CdS photocathode protection performance, the preparation method c...

Embodiment 1

[0029] (1) Preparation of CdS nanocrystals: Add 200 mL of distilled water to a 500 mL beaker, then weigh 20 parts of sodium sulfide and 30 parts of cadmium chloride and add them to the beaker, then add 2 parts of dilute hydrochloric acid dropwise to the beaker, place the beaker on Heat the water bath in the water bath pot at 60-65°C, stir at a constant speed on the magnetic stirrer for 40-50min, so that the cadmium chloride, sodium sulfide and dilute hydrochloric acid are fully mixed, after the stirring is complete, transfer the materials in the beaker into the hydrothermal reaction kettle , put it into the reaction kettle heater and heat it to 155-160°C, react for 12-15h, cool to room temperature after the reaction is complete, filter the material in the hydrothermal reaction kettle through a Buchner funnel, and filter the solid obtained after suction filtration first Wash the solid with 100-150mL of dilute hydrochloric acid with a mass fraction of 8-12%, remove the reaction b...

Embodiment 2

[0033](1) Preparation of CdS nanocrystals: Add 200mL of distilled water to a 500mL beaker, then weigh 21 parts of sodium sulfide and 31 parts of cadmium chloride and add them to the beaker, then add 3 parts of dilute hydrochloric acid dropwise to the beaker, place the beaker in Heat the water bath in the water bath pot at 60-65°C, stir at a constant speed on the magnetic stirrer for 40-50min, so that the cadmium chloride, sodium sulfide and dilute hydrochloric acid are fully mixed, after the stirring is complete, transfer the materials in the beaker into the hydrothermal reaction kettle , put it into the reaction kettle heater and heat it to 155-160°C, react for 12-15h, cool to room temperature after the reaction is complete, filter the material in the hydrothermal reaction kettle through a Buchner funnel, and filter the solid obtained after suction filtration first Wash the solid with 100-150mL of dilute hydrochloric acid with a mass fraction of 8-12%, remove the reaction by-p...

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Abstract

The invention relates to the technical field of photo-anode material preparation, and discloses a La2O3-CdS photo-anode composite with photoinduced cathode protection performance. The La2O3-CdS photo-anode composite is prepared from following raw materials including sodium sulfide, cadmium chloride, diluted hydrochloric acid, lanthanum chloride heptahydrate and ammonium hydroxide. According to theLa2O3-CdS photo-anode composite with photoinduced cathode protection performance, macromolecular La2O3-CdS has high redox activity, La2O3NPs is evenly dispersed on CdS NSs, close interface contact isachieved, photoinduced charge can be effectively transferred, the macromolecular La2O3-CdS can be repeatedly and stably subjected to redox reaction circulation, meanwhile, heterojunctions are formedbetween the La2O3-CdS, the La2O3-CdS photo-anode composite has obvious characteristic absorption edge red shift, the absorption strength within the range of 330 nm-580 nm is improved, separation and transmission of electrons and holes are promoted through the heterojunctions, light absorption is enhanced, the utilization rate of a photo-anode for photo-electrons is increased, and the photo-anode composite has highest charge separation and transfer efficiency.

Description

technical field [0001] The invention relates to the technical field of photoanode materials, specifically a La 2 o 3 - Photoanode composites with CdS photoinduced cathodic protection properties. Background technique [0002] Metal corrosion is the damage of metal materials by the action of the surrounding medium. Metal corrosion occurs chemical or electrochemical multi-phase reactions on the metal interface, making the metal turn into an oxidized (ion) state, which significantly reduces the strength and plasticity of the metal material. , toughness and other mechanical properties, damage the geometric shape of metal components, increase the wear and tear between parts, deteriorate electrical and optical physical properties, shorten the service life of equipment, and even cause catastrophic accidents such as fire and explosion. Metal corrosion is very common. For example, white spots appear on the surface of rusted iron products, aluminum products, patina on the surface of ...

Claims

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Application Information

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IPC IPC(8): C23F13/14C01G11/02C01F17/00B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C01G11/02C01P2004/80C23F13/14
Inventor 莫林祥
Owner 莫林祥