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Simple device for preparing adsorption photocatalysis coupling catalyst and removing antibiotics in wastewater

A catalyst and photocatalysis technology, which is applied in physical/chemical process catalysts, special compound water treatment, light water/sewage treatment, etc., can solve the problems of excessive antibiotic concentration, large floor area, charge recombination, etc., and achieve good stability , low cost, and the effect of increasing the illuminated area

Pending Publication Date: 2022-03-29
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the extensive use of antibiotics, the antibiotics that have not been absorbed by humans and animals are discharged into natural water bodies through excrement, making the concentration of antibiotics in the water environment exceed the standard, and the water body is seriously polluted
Traditional water treatment processes are difficult to completely degrade trace antibiotics, such as activated sludge method, membrane separation, etc., the process is complex and occupies a large area; the adsorption method has a better treatment effect, but only phase transfer occurs, and further treatment is still needed; Catalytic technology has strong oxidative properties and fast reaction rate, but there are still defects in the design of catalysts. For single-component photocatalysts, it is difficult for wide-bandgap photocatalysts to generate photoinduced charge pairs under visible light, and narrow-bandgap photocatalysts are prone to charge recombination under visible light.

Method used

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  • Simple device for preparing adsorption photocatalysis coupling catalyst and removing antibiotics in wastewater
  • Simple device for preparing adsorption photocatalysis coupling catalyst and removing antibiotics in wastewater
  • Simple device for preparing adsorption photocatalysis coupling catalyst and removing antibiotics in wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The adsorption photocatalytic coupling catalyst is made by the following method:

[0027] (1) Weigh 20g of melamine and place it in a 250ml ceramic crucible, place the covered ceramic crucible in the center of the muffle furnace, and the muffle furnace heats up to 550°C at a heating rate of 5°C / min. And keep it warm at this temperature for 2 hours, and obtain the g-C3N4 sample through grinding, and save it for future use;

[0028] (2) Weigh 2.425g of Bi(NO3)3·5H2O, add it into 100ml of ethylene glycol, and ultrasonically treat it for 15min until it is completely dissolved to obtain solution A;

[0029] Take 0.3 g of the g-C3N4 powder obtained in step (1) and add it to solution A, and continue stirring; then add 1.66 g of KI, and stir for 10 minutes to obtain solution B;

[0030] (3) Add the 2.0M sodium hydroxide solution of 15ml in solution B, measure the pH value with a pH meter, adjust the pH value at 10, continue to add 2g green tea while stirring, centrifuge with t...

Embodiment 2

[0032] A device for adsorption, photocatalysis, coupling and catalytic removal of antibiotics in wastewater (see figure 1 ), comprising a reactor body 4, a light source 3 is installed on the bottom of the reactor body and the surface of the top wall, the light can illuminate the whole reactor, and a pumping station 2 is set at the water inlet; a valve 9 is set at the water outlet to facilitate water outlet detection; The bottom and the top wall are provided with plate fixing devices 5, and each plate 6 is equally spaced and fully exposed to light, and the plates are uniformly coated with catalyst (prepared in Example 1).

Embodiment 3

[0034] A kind of adsorption photocatalytic coupling reaction device (see figure 1 ) method for removing antibiotics in waste water, comprising the steps:

[0035] (1) Use the device of adsorption photocatalysis coupling catalytic removal of antibiotics in wastewater in Example 2 (see figure 1 ), wherein the reactor body 4 is a rectangular parallelepiped sealed box with a length of 30cm, a width of 10cm, and a height of 20cm; the bottom of the reactor is equipped with a light source 3 of 25W with the top wall, and the plate is a length of 15cm and a width of 5cm. Fully irradiate on the plate, and the plate is coated with catalyst 5g (prepared in Example 1), and it is used after drying without coming off;

[0036] (2) Turn on the pumping station 2 to simulate antibiotic waste water. Take the tetracycline of 50mg / L as an example, close the valve 9, close the pumping station 2 after the water is full, turn on the light source 3, and react for 2 hours;

[0037] (3) open valve 9, ...

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Abstract

The invention discloses a preparation method of an adsorption photocatalysis coupling catalyst and a simple device for removing antibiotics in wastewater. The preparation method of the catalyst comprises the following steps: firing g-C3N4 in a muffle furnace by using melamine, and preparing a composite catalyst from g-C3N4, Bi (NO3) 3.5 H2O, KI and green tea through a simple in-situ precipitation method, then the obtained catalyst is smeared in a treatment device reactor, the reactor comprises a body, a light source and a plate sheet coated with the catalyst, the catalyst makes full contact with wastewater through the plate sheet, the catalyst utilization rate and the illumination area are increased, and the antibiotic degradation efficiency is greatly improved. The catalyst is simple and easy to prepare, green and pollution-free, a process device is simple in structure and controllable in operation, and the problems of low light absorption efficiency, low catalyst utilization rate and the like can be solved.

Description

technical field [0001] The invention belongs to the technical application field of adsorption photocatalysis materials, and in particular relates to a preparation method of an adsorption photocatalysis coupling catalyst and an application of a device for efficiently treating antibiotics in water bodies. Background technique [0002] With the rapid development of economy and society, antibiotics have always played an important role in social life. Antibiotics refer to substances that selectively inhibit the life activities of microorganisms at low concentrations. A large amount of antibiotics are produced in the world every year, about 50% of which are used for humans For medical use, 50% is used in agriculture and animal husbandry production, such as adding to animal feed, which can promote animal disease prevention and growth and development. Due to the extensive use of antibiotics, the antibiotics that have not been absorbed by humans and animals are discharged into natura...

Claims

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Application Information

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IPC IPC(8): B01J27/24C02F1/30C02F101/30
CPCB01J27/24C02F1/30C02F2305/10C02F2101/30B01J35/39
Inventor 刘宪华任俊郭雅静
Owner TIANJIN UNIV