Visible-light-photocatalyzed composite light-transmitting concrete as well as preparation method and application thereof

A visible-light-photocatalyzed composite light-transmitting concrete, comprising a plurality of bundles of optical fibers passing through the visible-light-photocatalyzed composite light-transmitting concrete, wherein an outer surface of the optical fibers are coated with a protective layer comprising a visible light photocatalyst, and the visible-light-photocatalyzed composite light-transmitting concrete has a plurality of gas-permeable pores;

• wherein the plurality of bundles of the optical fibers are arrayed in the visible-light-photocatalyzed composite light-transmitting concrete, and the protective layer is a mixture of a light-transmitting glue and the visible light photocatalyst
• the concrete comprises cement, wherein the visible light photocatalyst is dispersed in the cement
• the visible light photocatalyst is at least one diatomite-supported visible light photocatalyst selected from the group consisting of a diatomite-supported g-C3N4 photocatalyst and a diatomite-supported bismuth-based compound photocatalyst
• the diatomite-supported bismuth-based compound photocatalyst is at least one selected from the group consisting of a diatomite-supported Bi2WO6-VO photocatalyst, a diatomite-supported Bi2WO6 photocatalyst, a diatomite-supported Bi2MoO6 photocatalyst, a diatomite-supported bismuth oxyhalide photocatalyst, and a diatomite-supported bismuth oxide photocatalyst,
• the diatomite-supported bismuth oxyhalide photocatalyst is at least one selected from the group consisting of a diatomite-supported BiOBr photocatalyst, a diatomite-supported BiOCl photocatalyst, and a diatomite-supported BiOClxBr1−x, photocatalyst, wherein x is more than or equal to 0 and less than or equal to 1;
• the diatomite-supported visible light photocatalyst is prepared as follows:
• the diatomite-supported g-C3N4 photocatalyst is separately prepared by a method comprising the following steps:
• 1. ultrasonically dispersing a first amount of diatomite powder in an alcohol solution to obtain a diatomite suspension;
• 2. adding melamine to the diatomite suspension of step 1) to obtain a first reaction solution, stirring the first reaction solution at 20-30° C. for 2-6 h, drying a resulting mixture at 60-80° C. for 4-8 h to obtain a dried mixture, and calcining the dried mixture in a muffle furnace at 500-600° C. for 2-6 h to obtain the diatomite-supported g-C3N4 photocatalyst;
• the diatomite-supported bismuth-based compound photocatalyst is separately prepared by a method comprising the following steps:
• 1. dispersing a second amount of the diatomite powder in a first mixed solution of a water-soluble bismuth salt, ethylene glycol, and water;
• 2. adding a water-soluble salt to the first mixed solution to obtain a second mixed solution, stirring the second mixed solution for 2 h, and conducting a first hydrothermal reaction at 120-180° C. for 2-24 h;
• 3. after the first hydrothermal reaction, washing and drying a product of the first hydrothermal reaction to obtain the diatomite-supported bismuth-based compound photocatalyst,
• wherein when the water-soluble salt is a water-soluble tungstate, a water-soluble molybdate, a water-soluble carbonate, a water-soluble chloride salt, or a water-soluble bromine salt, the diatomite-supported bismuth-based compound photocatalyst obtained is respectively the diatomite-supported Bi2WO6 photocatalyst, the diatomite-supported Bi2MoO6 photocatalyst, the diatomite-supported bismuth oxide photocatalyst, the diatomite-supported BiOCl photocatalyst, or the diatomite-supported BiOBr photocatalyst;
• the diatomite-supported Bi2WO6-VO photocatalyst is separately prepared by a method comprising the following steps:
• adding Bi(NO3)3·5H2O to ethylene glycol under stirring to form a third mixed solution;
• meanwhile, dissolving Na2WO4·2H2O in ethylene glycol under stirring to form a fourth mixed solution;
• then, adding the fourth mixed solution dropwise to the third mixed solution under stirring to obtain a resulting solution, stirring the resulting solution at room temperature for 0.5 h, transferring the resulting solution to a first diatomite-filled reactor, and keeping the first diatomite-filled reactor at 160° C. for 6-24 h to perform a first reaction;
• after the first reaction is completed, naturally cooling the first diatomite-filled reactor to the room temperature, collecting and washing a solid precipitate, drying the solid precipitate at 60° C. overnight to obtain diatomite-supported Bi2WO6 with a high oxygen vacancy defect then, annealing the diatomite-supported Bi2WO6 in an air atmosphere at 250-550° C. for 4 h to obtain the diatomite-supported Bi2WO6-VO photocatalyst with a predetermined oxygen vacancy concentration;
• the diatomite-supported BiOClxBr1−x photocatalyst is separately prepared by a method comprising the following steps:
• dissolving Bi(NO3)3·5H2O in HNO3 under stirring to obtain a first transparent solution;
• dissolving KCl and KBr at an amount-of-substance ratio of x:(1−x) in water, adding citric acid to obtain a second transparent solution, wherein x is more than or equal to 0 and less than or equal to 1;
• adding the second transparent solution dropwise to the first transparent solution under stirring, adjusting a pH to 7.0, continuing stirring to obtain a fifth mixed solution, transferring the fifth mixed solution to a second diatomite-filled hydrothermal reactor to obtain a reaction mixture, conducting a second hydrothermal reaction with the reaction mixture at a constant temperature of 120° C. for 10 h, after the second hydrothermal reaction is completed, naturally cooling the reaction mixture, removing a supernatant from the reaction mixture, washing and filtering a product of the second hydrothermal reaction, and drying the product at 60° C. to obtain the diatomite-supported BiOClxBr1−x photocatalyst, wherein x is more than or equal to 0 and less than or equal to 1;
• the diatomite-supported bismuth oxide photocatalyst is prepared by a method comprising the following steps:
• dissolving bismuth citrate in water and stirring to obtain a bismuth citrate solution;
• adding Na2CO3 to distilled water and dissolving Na2CO3 under stirring to obtain a Na2CO3 solution;
• adding the Na2CO3 solution dropwise to the bismuth citrate solution to obtain a sixth mixed solution under stirring;
• transferring the sixth mixed solution to a third diatomite-filled hydrothermal reactor, keeping the third diatomite-filled hydrothermal reactor at 160° C. for 18 h to perform a third hydrothermal reaction, after the third hydrothermal reaction is completed, centrifuging and washing a product of the third hydrothermal reaction, and drying the product at 60° C. to obtain a precursor;
• calcining the precursor at 300° C.-500° C. to obtain the diatomite-supported bismuth oxide photocatalyst.