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Floating visible-light-induced photocatalyst, and preparation method and application thereof

A photocatalyst, visible light technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problems of floating bead structure rupture, loss of floating performance, high equipment requirements, etc. Controllable, easy to implement and industrialized utilization, low cost effect

Active Publication Date: 2017-05-03
HUNAN CITY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, Document 3 adopts a high-temperature calcination method in the process of using floating beads to support photocatalysts. This method requires high energy consumption during the calcination process and has high requirements for equipment, and it is easy to cause The structure of the floating beads is broken and loses the floating performance

Method used

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  • Floating visible-light-induced photocatalyst, and preparation method and application thereof
  • Floating visible-light-induced photocatalyst, and preparation method and application thereof
  • Floating visible-light-induced photocatalyst, and preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0030] A method for preparing a floating visible light photocatalyst, comprising the following steps:

[0031] (1) Pretreatment of floating beads, adding fly ash floating beads to distilled water, washing at room temperature for 1h-2h, filtering, and drying at 101°C;

[0032] ⑵Bi(NO 3 ) 3 • 5H 2 O dissolved in ethylene glycol, Bi(NO 3 ) 3 • 5H 2 The mass ratio of O to ethylene glycol is 1:5 to 40. After all the solids are dissolved, add KBr or / and KI, fully stir and dissolve into a transparent mixed solution; KBr and Bi(NO 3 ) 3 • 5H 2 The molar ratio of O is 0~1:1, KI and Bi(NO 3 ) 3 • 5H 2 The molar ratio of O is 0 to 1:1, the total molar number of KBr and KI and Bi(NO 3 ) 3 • 5H 2 The molar ratio of O is 1:1;

[0033] In step (2) of the present invention, Bi(NO 3 ) 3 • 5H 2 The mass ratio of O to ethylene glycol is preferably 1:15-30.

[0034] In step (2) of the present invention, Bi(NO 3 ) 3 • 5H 2 The mass ratio of O to ethylene glycol is preferably 1...

Embodiment 2

[0043] In this embodiment, fly ash floating beads (with a diameter of 20 μm to 200 μm and a specific gravity of 0.3 g / cm 3 ~0.5g / cm 3 ) into distilled water, wash at room temperature for 1-2 hours, filter, and dry at 101°C; weigh 2.8 mmo of Bi(NO 3 ) 3 • 5H 2 O was dissolved in 20mL ethylene glycol, and after all the solids were dissolved, 2.8 mmol KI was added to make KI and Bi(NO 3 ) 3 • 5H 2 O molar ratio is 1:1, fully stirred and dissolved into a transparent mixed solution; add 2.0g dried fly ash float beads to the above mixed solution, fully stir for 60min, and then add to the above mixed solution under continuous stirring at room temperature The liquid is slowly added to 35.0 wt﹪ NH 3 •H 2 O adjust the pH value of the system to 9 to obtain a white mixture; vacuum filter the milky suspension obtained in the above steps, and keep the obtained filter cake in an oven at 160 ° C for 6 hours, and then the obtained yellow-brown powder The sample was washed several times...

Embodiment 3

[0045] In this embodiment, fly ash floating beads (with a diameter of 20 μm to 200 μm and a specific gravity of 0.3 g / cm 3 ~0.5g / cm 3 ) into distilled water, wash at room temperature for 1-2 hours, filter, and dry at 101°C; weigh 2.8 mmo of Bi(NO 3 ) 3 • 5H 2 O was dissolved in 20mL ethylene glycol, and after the solid was completely dissolved, 1.4 mmol KBr and 1.4 mmol KI were added to make KBr and Bi(NO 3 ) 3 • 5H 2 O molar ratio is 0.5:1, while KI and Bi(NO 3 ) 3 • 5H 2 The O molar ratio is 0.5:1, the total molar number of NaBr and KI and Bi(NO 3 ) 3 • 5H 2 The molar ratio of O is 1:1, fully stirred and dissolved into a transparent mixed solution; 2.0 g of dried hollow microsphere carrier was added to the above mixed solution, and fully stirred for 60 min. Then, under continuous stirring at room temperature, slowly add 35.0 wt﹪ NH 3 •H 2 O adjust the pH value of the system to 9 to obtain a white mixture; vacuum filter the milky suspension obtained in the above ...

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Abstract

The invention discloses a floating visible-light-induced photocatalyst capable of degrading organic pollutants in a water body. The floating visible-light-induced photocatalyst uses fly ash floating beads as a carrier, wherein the surfaces of the fly ash floating beads are coated with a BiOBr or / and BiOI material, and a coverage rate is 50 to 100%; and the fly ash floating beads are hollow spherical particles with diameters in a range of 20 to 200 [mu]m and specific gravity of 0.3 to 0.5 g / cm<3>. A preparation method for the floating visible-light-induced photocatalyst loads BiOBr or / and BiOI onto the surfaces of the fly ash floating beads through two steps, i.e., neutralization-hydrolysis and low-temperature insulation treatment, so energy consumption of high-temperature treatment and damage of high-temperature treatment to the structures of the floating beads are avoided, operation time is short and controllable, and implementation and industrial utilization of the preparation method are more easier. The prepared visible-light-induced photocatalyst has low cost, can be repeatedly used, is floatable on the surface of a water body, enables the removal rate of rhodamine B to reach 100% within 40 min, and has good application prospects in treatment of pollutions of surface water bodies, especially in treatment of water bodies with organic pollutants floating on the surface of the water bodies.

Description

technical field [0001] The invention relates to a visible light photocatalyst, in particular to a floating visible light photocatalyst and its preparation method and application, in particular to a floating visible light photocatalyst for degrading organic pollutants in water, its preparation method and application. Background technique [0002] With the development of social economy, energy crisis and environmental problems are the common concerns of the global society today, and semiconductor photocatalysis shows the advantages of strong oxidation, complete mineralization of pollutants, low cost, high efficiency, and no secondary pollution. , can completely mineralize organic pollutants, and can directly use sunlight as an energy source, which is expected to solve energy and environmental problems at the same time, so it has always attracted people's attention. At present, the most concerned photocatalyst is TiO 2 , mainly because it is non-toxic, stable in physical and c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/138B01J27/06C02F1/30C02F101/38
Inventor 林立袁点邓怡玄
Owner HUNAN CITY UNIV
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