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Composite material for carrying out photocatalytic degradation on microcystin and preparation method and application thereof

A catalytic material and composite photocatalytic technology, applied in the field of g-C3N4/BiOI composite visible light catalytic material and its preparation, to achieve the effects of rapid migration, efficient use of solar energy, and large specific surface area

Inactive Publication Date: 2017-05-31
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far about g-C 3 N 4 / BiOI composite photocatalytic materials have not been involved in the report of microcystin (MC-LR) in water

Method used

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  • Composite material for carrying out photocatalytic degradation on microcystin and preparation method and application thereof
  • Composite material for carrying out photocatalytic degradation on microcystin and preparation method and application thereof
  • Composite material for carrying out photocatalytic degradation on microcystin and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Preparation of BiOI: Weigh 0.97g Bi(NO 3 ) 3 ·5H 2O in 20mL deionized water, ultrasonicated for 30min and magnetically stirred for 10min, 0.332g KI was dissolved in 20mL deionized water, and then the KI solution was added dropwise to the Bi(NO 3 ) 3 ·5H 2 In the O solution, stirring was continued to obtain a uniformly distributed brick-red liquid. After natural sedimentation, the precipitate was collected, washed alternately with deionized water and ethanol for 3 times, and the brick-red precipitate was dried at 60°C for 12 hours to obtain BiOI.

Embodiment 2

[0034] g-C 3 N 4 Preparation of photocatalyst: Weigh 8g of melamine and place it in a semi-closed alumina crucible, move it into a muffle furnace and calcinate at 550°C for 4h with a heating rate of 2.3°C / min, cool naturally to room temperature and grind to obtain g-C 3 N 4 Powder.

Embodiment 3

[0036] g-C 3 N 4 Preparation of / BiOI composite photocatalytic material: Weigh 2 g of melamine and 1.0 g of the BiOI powder obtained in Example 1, dissolve them together in 50 mL of absolute ethanol, and stir for 30 min, then put the stirred solution into an oven at 60°C for drying Dry for 3 hours, then move the dried powder into a semi-closed alumina crucible, place it in a muffle furnace and calcinate at 550°C for 4 hours, the heating rate is 2.3°C / min, cool to room temperature and grind to obtain g-C 3 N 4 / BiOI composite photocatalytic material, where g-C 3 N 4 The mass ratio in the composite photocatalytic material is 50wt%.

[0037] The SEM analysis result of pure BiOI ( Figure 1a ) shows that pure BiOI is a flower-like structure formed by irregular accumulation of many irregular round cakes. The thickness of nanosheets is about 30nm and the diameter is about 100-500nm. g-C 3 N 4 FESEM analysis results of / BiOI composite visible photocatalytic material ( Figure...

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Abstract

The invention belongs to the field of photocatalytic environmental protection, and particularly relates to a preparation method and application of a g-C3N4 / BiOI composite visible light catalytic material for carrying out photocatalytic degradation on microcystin. Photocatalytic degradation on organic pollutants has been generally recognized as one of green environment purification technologies with the widest prospect. Compared with a conventional treatment process, a technology for carrying out photocatalytic degradation on the microcystin, which is adopted by the invention, has the advantages of no secondary pollution, complete removal on pollutants, safety, stability, low cost and the like, has an obvious degradation effect on toxic organic pollutants which take microcystin (MC-LR) as the representative, and has no related research results reported publicly. According to the invention, by adopting a solid-phase calcination method, a novel narrow band-gap semiconductor BiOI and nonmetal organic semiconductor graphite-phase carbon nitride (g-C3N4) are compounded to prepare the g-C3N4 / BiOI composite visible light catalytic material; the composite material can effectively expand a spectral response range, promote separation and transfer of semiconductor photo-induced electron-hole pairs, reduce the compound probability of the semiconductor photo-induced electron-hole pairs and improve photocatalytic efficiency. The preparation method disclosed by the invention is simple in preparation process, mild in condition, high in stability and low in cost, and can efficiently utilize solar energy; the prepared composite photocatalytic material can be applied to the field of treatment on eutrophic water, and has high practical value and wide application prospect.

Description

[0001] Technical field: [0002] The invention belongs to the field of photocatalytic environmental protection, in particular to a g-C that catalyzes the degradation of microcystins 3 N 4 / BiOI composite visible light photocatalytic material and its preparation method and application. [0003] Background technique: [0004] As a large amount of nutrient-rich industrial wastewater, domestic sewage and farmland drainage enter the water body, many water bodies in nature have become eutrophic. Cyanobacteria is a kind of harmful algae that grows widely and floats in water bodies. Microcystin (MC) is a type of cyanotoxin released by toxin-producing cyanobacteria with the highest frequency, the largest amount, and the most serious damage, threatening aquatic life. animal and human health. MC has a cyclic heptapeptide structure and is very stable in nature. It is still inactivated and non-volatile at a high temperature of 300°C. Traditional elimination methods are difficult to achie...

Claims

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Application Information

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IPC IPC(8): B01J27/24C02F1/30C02F101/38
CPCC02F1/30B01J27/24C02F2305/10C02F2101/38B01J35/39Y02W10/37
Inventor 王利平张帆袁鑫刘菲杜尔登肖梅
Owner CHANGZHOU UNIV
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