AU2019100895A4 - Preparation method of bi/bioi nanosheet photocatalyst - Google Patents
Preparation method of bi/bioi nanosheet photocatalyst Download PDFInfo
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- 239000011941 photocatalyst Substances 0.000 title claims abstract description 67
- 239000002135 nanosheet Substances 0.000 title claims abstract description 40
- 238000002360 preparation method Methods 0.000 title claims abstract description 19
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims abstract description 75
- 238000003756 stirring Methods 0.000 claims abstract description 19
- 238000001816 cooling Methods 0.000 claims abstract description 8
- 238000010438 heat treatment Methods 0.000 claims abstract description 7
- PPNKDDZCLDMRHS-UHFFFAOYSA-N dinitrooxybismuthanyl nitrate Chemical compound [Bi+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O PPNKDDZCLDMRHS-UHFFFAOYSA-N 0.000 claims description 28
- 239000000243 solution Substances 0.000 claims description 26
- 239000002244 precipitate Substances 0.000 claims description 18
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 12
- 238000001027 hydrothermal synthesis Methods 0.000 claims description 11
- 238000006243 chemical reaction Methods 0.000 claims description 7
- 239000008367 deionised water Substances 0.000 claims description 6
- 229910021641 deionized water Inorganic materials 0.000 claims description 6
- 239000011259 mixed solution Substances 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 238000004140 cleaning Methods 0.000 claims 2
- 238000001035 drying Methods 0.000 claims 2
- 238000001914 filtration Methods 0.000 claims 1
- IISBACLAFKSPIT-UHFFFAOYSA-N bisphenol A Chemical compound C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 IISBACLAFKSPIT-UHFFFAOYSA-N 0.000 abstract description 37
- 230000015556 catabolic process Effects 0.000 abstract description 13
- 230000003197 catalytic effect Effects 0.000 abstract description 13
- 238000006731 degradation reaction Methods 0.000 abstract description 13
- 230000000694 effects Effects 0.000 abstract description 5
- 230000003647 oxidation Effects 0.000 abstract description 5
- 238000007254 oxidation reaction Methods 0.000 abstract description 5
- 230000000593 degrading effect Effects 0.000 abstract description 2
- 238000010335 hydrothermal treatment Methods 0.000 abstract 1
- 229940106691 bisphenol a Drugs 0.000 description 15
- 230000001699 photocatalysis Effects 0.000 description 13
- 239000002245 particle Substances 0.000 description 11
- 239000004065 semiconductor Substances 0.000 description 10
- 239000000463 material Substances 0.000 description 9
- 229910052797 bismuth Inorganic materials 0.000 description 8
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 238000012546 transfer Methods 0.000 description 5
- 238000004458 analytical method Methods 0.000 description 4
- 238000011056 performance test Methods 0.000 description 4
- 238000007146 photocatalysis Methods 0.000 description 4
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J27/00—Catalysts comprising the elements or compounds of halogens, sulfur, selenium, tellurium, phosphorus or nitrogen; Catalysts comprising carbon compounds
- B01J27/06—Halogens; Compounds thereof
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/30—Catalysts, in general, characterised by their form or physical properties characterised by their physical properties
- B01J35/39—Photocatalytic properties
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01J35/40—Catalysts, in general, characterised by their form or physical properties characterised by dimensions, e.g. grain size
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/34—Organic compounds containing oxygen
- C02F2101/345—Phenols
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/10—Photocatalysts
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Abstract
) The present invention relates to a preparation method of a Bi/BiOI nanosheet photocatalyst. The preparation method mainly includes respectively dissolving Bi(N03)3-5H 20 and KI in ethylene glycol solutions, uniformly stirring, conducting hydrothermal treatment and high temperature heat treatment, and cooling to obtain a Bi/BiOI nanosheet photocatalyst. The Bi/ BiOI nano flower-like spherical photocatalyst in the present invention has a unique morphology and a large specific surface area, and can well absorb visible light. In a visible light condition, the Bi/BiOI nano flower-like spherical photocatalyst has an obvious effect of degrading bisphenol A (BP-A) and high catalytic activity and oxidation capability, and a BP-A degradation rate thereof within one hour is greater than 99%. - PDF#85-1329 Bi PDF#IO-445 BiOI -- c lo 20 30 40 ;0 60 70 80o Temperature (-C) Fig. 2
Description
PREPARATION METHOD OF BI/BIOI NANOSHEET PHOTOCATALYST
TECHNICAL FIELD
The present invention relates generally to the field of photocatalysis technologies, and specifically relates to a preparation method of a Bi/BiOI nanosheet photocatalyst.
BACKGROUND
With the development of industrialization and the demand of human society, bisphenol-A (BP-A) is widely used as a raw material for synthesis of polycarbonate (PC), epoxy resin, and the like in industrial production. Because BP-A is highly toxic, environmental pollution is caused during use of BP-A. How to deal with an increasingly serious environmental pollution problem has also been widely concerned. Currently, a photocatalysis technology is an environmental friendly pollution-free solution. Among photocatalytic materials, T1O2 is most widely studied. The material is non-toxic, and has stable chemical properties and a relatively strong redox capability, but due to a limitation on its own forbidden bandwidth, T1O2 can only respond to ultraviolet light and induce a series of catalytic reactions. In addition, due to its excessively high recombination capability of photogenerated electron holes, an actual application of T1O2 is limited. Therefore, the preparation of a new and efficient photocatalyst is an important research direction for resolving an actual application of a photocatalytic material.
In a semiconductor photocatalytic material system, a bismuth oxyhalide has been widely studied in the photocatalysis field because of its special electronic structure, good sunlight response, and relatively high photocatalytic activity. A BiOI photocatalyst is studied most extensively and deeply. It is known that, during study of BiOI, there is an advantage currently that photogenerated electron holes are easily recombined, and therefore the BiOI does not have efficient catalytic activity. A metal-semiconductor composite material is an effective means for improving photocatalytic activity of a semiconductor by using a metal-semiconductor junction. Bismuth, as a semi-metal, is cheaper than other precious metals widely used in photocatalysis, such as Au, Ag, and Pt. In addition, when a metal is composited with a semiconductor, the metal interacts with full-band light on a surface of the semiconductor to generate a thermal effect and energy, so as to separate electrons and holes of the semiconductor, thereby broadening a spectral response range of a photocatalyst. In addition, bismuth, as a metal, can become a good acceptor of electrons on the semiconductor surface, forming an electron trap to inhibit recombination of electron holes. Therefore, in embodiments of the present technology, a hydrothermal method and a heat treatment method are sequentially conducted to prepare a Bi/BiOI nano flower-like
2019100895 13 Aug 2019 spherical photocatalyst, which shows enhanced visible-light catalytic activity under visible light irradiation.
SUMMARY
A technical problem to be resolved in the present technology is to provide a preparation method of a Bi/BiOI nano flower-like spherical photocatalyst in view of the deficiency in the prior art.
A technical aspect of the present invention is as follows:
A preparation method of a Bi/BiOI nanosheet photocatalyst is provided, including the following steps:
(1) Dissolve a specific amount of Bi(NO3)3’5H2O in an ethylene glycol solution and stir for min to 40 min, dissolve a specific amount of KI in an ethylene glycol solution and stir for 20 min to 40 min, add the ethylene glycol solution of the KI to the ethylene glycol solution of the Bi(NO3)3’5H2O and stir for 1 h to 1.5 h, transfer a mixed solution obtained to a high pressure hydrothermal reactor, conduct a hydrothermal reaction at 100°C to 200°C for 12 h, conduct cooling after the reaction is finished, and filter out precipitate.
(2) Clean the precipitate with deionized water and ethanol, and dry the precipitate to obtain BiOI nano flower-like spheres.
(3) Clean and dry the BiOI nano flower-like spheres obtained in step (2), place the BiOI nano flower-like spheres into a tube furnace filled with N2 as shielding gas, hold at 300°C to 600°C for 1 h to 3 h, and naturally cool to room temperature to obtain a Bi/BiOI nanosheet photocatalyst.
In one embodiment, a molar ratio of the Bi(NO3)3’5H2O to the KI is (0.9 to 1):1.
In one embodiment, the hydrothermal reaction is conducted at 120°C to 180°C for 10 h to 14h.
In one embodiment, heat treatment is holding at 400°C to 500°C for 2 h by using N2 as shielding gas.
According to one aspect of the present technology, a Bi/BiOI nanosheet photocatalyst is provided, where the Bi/BiOI nanosheet photocatalyst is prepared by using the foregoing preparation method of a Bi/BiOI nanosheet photocatalyst.
2019100895 13 Aug 2019
In one embodiment, the Bi/BiOI nanosheet photocatalyst is a flower-like spherical structure formed through self-assembly of nano Bi particles and a BiOI nanosheet.
In one embodiment, a particle diameter of the Bi particles is 2 nm to 10 nm, and a thickness of the BiOI nanosheet is 5 nm to 20 nm.
In one embodiment, a specific surface area of the Bi/BiOI nanosheet photocatalyst is 17.07 m2/g.
An application of the Bi/BiOI nanosheet photocatalyst in degradation of BP-A in a visible light condition is provided, and a BP-A degradation rate of the Bi/BiOI nanosheet photocatalyst in a visible light condition is greater than 99%.
Compared with the prior art, beneficial effects of embodiments of the present invention are as follows:
1. The Bi/BiOI nano flower-like spherical photocatalyst in the present invention is prepared by mainly compositing a metal Bi with a semiconductor material BiOI. A hydrothermal method is first conducted, and then a heat treatment method is conducted for in-situ production of Bi particles. Bismuth is used as a semimetal, and when the bismuth is composited with BiOI, the bismuth interacts with full-band light on a surface of the BiOI to generate a thermal effect and energy to separate electrons and holes for the BiOI. In addition, the bismuth can become a good acceptor of electrons on the semiconductor surface, forming an electron trap to inhibit recombination of electron holes. This is conducive to light absorption of BiOI and can effectively improve photocatalytic activity of the BiOI. The bismuth can also be used as a reaction site on the surface of the catalyst to improve activity of the catalyst.
2. The Bi/BiOI nano flower-like spherical photocatalyst in the present invention is a flowerlike spherical structure formed through self-assembly of nano Bi particles and a BiOI nanosheet, and has a unique morphology and a large specific surface area, and can well absorb visible light.
3. In a visible light condition, the Bi/BiOI nano flower-like spherical photocatalyst in the present invention has an obvious effect of degrading BP-A and high catalytic activity and oxidation capability, and a BP-A degradation rate thereof is greater than 99%.
4. In the preparation method of the present invention, a hydrothermal method is first conducted, and then heat treatment is conducted. Through high temperature treatment, weak van der waals force between [BiO]2+ and I~ in BiOI is broken and a part of I volatilizes; Bi3+ is
2019100895 13 Aug 2019 reduced to BiO in an atmosphere of N2, so as to grow a single substance Bi in situ on a BiOI sample, that is, the single substance Bi does not belong to a foreign Bi source. The whole process is simple with few by-products produced, and has low costs and high product yield.
2019100895 13 Aug 2019
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is XRD spectra of a photocatalyst prepared in Embodiment 1 of the present invention and pure BiOI;
FIG. 2 is an SEM image of the photocatalyst prepared in Embodiment 1 of the present invention;
FIG. 3 is UV-vis DRS spectra of the photocatalyst prepared in Embodiment 1 of the present invention and pure BiOI;
FIG. 4 is a BET image and a BJH image of the photocatalyst prepared in Embodiment 1 of the present invention;
FIG. 5 is a comparison diagram between degradation rates of the photocatalyst prepared in Embodiment 1 of the present invention and pure BiOI; and
FIG. 6 is a curve comparison diagram between BP-A removal rates of the photocatalyst prepared in Embodiment 1 of the present invention and pure BiOI.
DETAILED DESCRIPTION
The present invention is further described below with reference to the accompanying drawings and embodiments.
Embodiment 1
A preparation method of a Bi/BiOI nanosheet photocatalyst in this embodiment is mainly implemented based on the following steps:
(1) Dissolve 1.3824 g Bi(NO3)3’5H2O in 50 ml of an ethylene glycol solution and stir for 30 min, dissolve 0.501 g KI in 50 ml of an ethylene glycol solution and stir for 30 min, add the ethylene glycol solution of thr KI to the ethylene glycol solution of the Bi(NO3)3’5H2O to make a molar ratio of Bi(NO3)3’5H2O to KI be 0.95:1, stir for 1 h, transfer a mixed solution obtained to a high pressure hydrothermal reactor, conduct a hydrothermal reaction at 160°C for 12 h, conduct cooling after the reaction is finished, and filter out precipitate.
(2) Clean the precipitate with deionized water and ethanol, and dry the precipitate at 80°C to obtain BiOI nano flower-like spheres.
2019100895 13 Aug 2019 (3) Clean the BiOI nano flower-like spheres obtained in step (2), dry the BiOI nano flowerlike spheres at 80°C, place the BiOI nano flower-like spheres into a tube furnace filled with N2 as shielding gas, hold at 500°C for 2 h, and naturally cool to room temperature to obtain a Bi/BiOI nanosheet photocatalyst.
XRD analysis is conducted on the foregoing obtained Bi/BiOI nano flower-like spherical photocatalyst, and a result is shown in FIG. 1.
It can be seen from FIG. 1 that, phases of the photocatalyst prepared in Embodiment 1 are BiOI and Bi.
SEM analysis is conducted on the foregoing obtained Bi/BiOI nano flower-like spherical photocatalyst, and a result is shown in FIG. 2. FIG. 2 is an SEM image of the Bi/BiOI nano flower-like spherical photocatalyst prepared in Embodiment 1 of the present invention.
It can be seen from FIG. 2 that, the Bi/BiOI nano flower-like spherical photocatalyst prepared in this embodiment is flower-like spheres formed through self-assembly of nano Bi particles and a BiOI nanosheet, where a particle diameter of the Bi particles is 5 nm, and a thickness of the BiOI nanosheet is 5 nm to 20 nm.
UV-vis DRS analysis is conducted on the obtained Bi/BiOI nano photocatalyst, and a result is shown in FIG. 3. FIG. 3 is a UV-vis DRS spectrum of the Bi/BiOI nano photocatalyst prepared in Embodiment 1 of the present invention.
The result of FIG. 3 shows that, due to compositing with Bi, the Bi/BiOI nano flower-like spheres prepared in this embodiment significantly absorb visible light compared with pure BiOI.
It can be seen from FIG. 4 that, for the Bi/BiOI nano flower-like spherical photocatalyst prepared in this embodiment, a typical mesoporous adsorption-desorption curve is obtained, a specific surface area of the Bi/BiOI nano flower-like spherical photocatalyst is 17.076 m2/g, and mesoporous pore diameter distribution is mainly within a range of 1 nm to 5 nm and a range of 30 nm and 100 nm.
Embodiment 2
A difference between this embodiment and Embodiment 1 lies in that: In step (3), the BiOI nano flower-like spheres are cleaned and dried, placed into a tube furnace filled with N2 as
2019100895 13 Aug 2019 shielding gas, held at 450°C for 2 h, and naturally cooled to room temperature to obtain a Bi/ BiOI nanosheet photocatalyst.
Phase analysis is conducted on the Bi/BiOI prepared in Embodiment 2, and an XRD spectrum thereof is shown in FIG. 1. A result shows that phases of this material are BiOI and Bi.
After visible light irradiation is conducted for 30 minutes, a BP-A degradation rate of this material reaches 93%.
FIG. 4 shows a comparison result between catalytic performance tests of this embodiment of the present invention and pure BiOI. The result shows that the Bi/BiOI photocatalyst prepared in Embodiment 2 has higher visible-light catalytic activity.
Embodiment 3
A difference between this embodiment and Embodiment 1 lies in that: In step (3), the BiOI nano flower-like spheres are cleaned and dried, placed into a tube furnace filled with N2 as shielding gas, held at 400°C for 2 h, and naturally cooled to room temperature to obtain a Bi/ BiOI nanosheet photocatalyst.
Phase analysis is conducted on Bi/BiOI prepared in Embodiment 3, and an XRD spectrum thereof is shown in FIG. 1. A result shows that phases of this material are BiOI and Bi.
After visible light irradiation is conducted for 60 minutes, a BP-A degradation rate of this material reaches 99%.
FIG. 4 shows a comparison result between catalytic performance tests of this embodiment of the present invention and pure BiOI. The result shows that the Bi/BiOI photocatalyst prepared in Embodiment 3 has higher visible-light catalytic activity.
Embodiment 4
A preparation method of a Bi/BiOI nanosheet photocatalyst in this embodiment is mainly implemented based on the following steps:
(1) Dissolve 1.3096 g Βΐ(Νθ3)3’5Η2θ in 50 ml of an ethylene glycol solution and stir for 20 min, dissolve 0.501 g KI in 50 ml of an ethylene glycol solution and stir for 20 min, add the ethylene glycol solution of the KI to the ethylene glycol solution of the Bi(NO3)3’5H2O to make a
2019100895 13 Aug 2019 molar ratio of Bi(NO3)3’5H2O to KI be 0.90:1, stir for 1.5 h, transfer a mixed solution obtained to a high pressure hydrothermal reactor, conduct a hydrothermal reaction at 180°C for 10 h, conduct cooling after the reaction is finished, and filter out precipitate.
(2) Clean the precipitate with deionized water and ethanol, and dry the precipitate at 80°C to obtain BiOI nano flower-like spheres.
(3) Clean the BiOI nano flower-like spheres obtained in step (2), dry the BiOI nano flowerlike spheres at 80°C, place the BiOI nano flower-like spheres into a tube furnace filled with N2 as shielding gas, hold at 300°C for 3 h, and naturally cool to room temperature to obtain a Bi/BiOI nanosheet photocatalyst.
Embodiment 5
A preparation method of a Bi/BiOI nanosheet photocatalyst in this embodiment is mainly implemented based on the following steps:
(1) Dissolve 1.4551 g Bi(NO3)3’5H2O in 50 ml of an ethylene glycol solution and stir for 40 min, dissolve 0.501 g KI in 50 ml of an ethylene glycol solution and stir for 40 min, add the ethylene glycol solution of the KI to the ethylene glycol solution of the Bi(NO3)3’5H2O to make a molar ratio of Bi(NO3)3’5H2O to KI be 1:1, stir for 1 h, transfer a mixed solution obtained to a high pressure hydrothermal reactor, conduct a hydrothermal reaction at 120°C for 14 h, conduct cooling after the reaction is finished, and filter out precipitate.
(2) Clean the precipitate with deionized water and ethanol, and dry the precipitate at 80°C to obtain BiOI nano flower-like spheres.
(3) Clean the BiOI nano flower-like spheres obtained in step (2), dry the BiOI nano flowerlike spheres at 80°C, place the BiOI nano flower-like spheres into a tube furnace filled with N2 as shielding gas, hold at 500°C for 2 h, and naturally cool to room temperature to obtain a Bi/BiOI nanosheet photocatalyst.
Embodiment 6
A preparation method of a Bi/BiOI nanosheet photocatalyst in this embodiment is mainly implemented based on the following steps:
(1) Dissolve 1.3824 g Βΐ(Νθ3)3’5Η2θ in 50 ml of an ethylene glycol solution and stir for 40 min, dissolve 0.501 g KI in 50 ml of an ethylene glycol solution and stir for 40 min, add the ethylene glycol solution of the KI to the ethylene glycol solution of the Bi/NCfiTAHzO to make a molar ratio of Bi/NCbTAHzO to KI be 0.95:1, stir for 1 h, transfer a mixed solution obtained to a high pressure hydrothermal reactor, conduct a hydrothermal reaction at 100°C for 14 h, conduct cooling after the reaction is finished, and filter out precipitate.
2019100895 13 Aug 2019 (2) Clean the precipitate with deionized water and ethanol, and dry the precipitate at 80°C to obtain BiOI nano flower-like spheres.
(3) Clean the BiOI nano flower-like spheres obtained in step (2), dry the BiOI nano flowerlike spheres at 80°C, place the BiOI nano flower-like spheres into a tube furnace filled with N2 as shielding gas, hold at 600°C for 1 h, and naturally cool to room temperature to obtain a Bi/BiOI nanosheet photocatalyst.
By using an experimental method the same as the foregoing, further analysis is conducted on the Bi/BiOI nano flower-like spherical photocatalysts prepared in Embodiment 4 to Embodiment 6, and results are the same as the experimental results of Embodiment 1 to Embodiment 3. The Bi/BiOI nano flower-like spherical photocatalyst in the present invention is flower-like spheres formed through self-assembly of nano Bi particles and a BiOI nanosheet, where a particle diameter of the Bi particles is 5 nm, and a thickness of the BiOI nanosheet is 5 nm to 20 nm, a specific surface area of the Bi/BiOI nano flower-like spherical photocatalyst is 17.076 m2/g, and mesoporous pore diameter distribution is mainly within a range of 1 nm to 5 nm and a range of 30 nm and 100 nm. In addition, through the foregoing UV-vis DRS spectrum analysis, it can be further seen that the Bi/BiOI nanosheet photocatalyst in the present invention significantly absorbs visible light.
To further verify its photocatalytic effect, photocatalytic activity of the Bi/BiOI nano flowerlike spherical photocatalyst of the present invention is verified through the following experiment.
A specific process is as follows:
In a room-temperature condition, 50 mg of the Bi/BiOI photocatalyst obtained in Embodiment 1 of the present invention is placed in a clean glass vessel, and is placed in a working chamber of a photocatalytic analyzer after being dispersed with 50 mL of a 20 mg/L BPA solution, and is subject to magnetic stirring for 30 minutes in a dark environment, to reach the adsorption and desorption balance. An LED lamp with power of 300 watts is used as a visible light source for visible light irradiation on the Bi/BiOI for 60 minutes. Sampling is conducted every 10 min. After centrifugation is conducted on a sample, supernatant is taken out, and absorbance of the supernatant is measured with an ultraviolet spectrophotometer. A calculated BP-A degradation rate of the Bi/BiOI reaches 99%.
As shown in FIG. 5, FIG. 6, and Table 1 of a comparison result between catalytic performance tests of Embodiment 1 of the present invention and pure BiOI, the Bi/BiOI nano
2019100895 13 Aug 2019 flower-like spherical photocatalyst in Embodiment 1 has higher visible-light catalytic activity and has a highest oxidation capability, and specific values are shown in Table 1.
Table 1: BP-A degradation rates of the Bi/BiOI in Embodiment 1 and pure BiOI
| Pure BiOI | Embodiment 1 | |
| BP-A degradation rate | 53% | 99% |
It can be learned from Table 1 and through comparison with the catalytic performance test of the pure (BiO)2CO3, the Bi/BiOI nano flower-like spherical photocatalyst prepared in the present invention has a BP-A degradation rate greater than 99% within one hour under visible light irradiation, has excellent catalytic activity and oxidation capability, has a high degradation speed, and can complete degradation only for approximately 30 min.
Catalytic performance and oxidation capabilities of Bi/BiOI obtained by other embodiments are verified in the same method, and results are the same as that of Embodiment 1.
Throughout the specification and the claims that follow, the word “comprising” and its grammatical variants is to be considered to refer to a thing, inclusive of other elements, and not the thing alone, exclusive of other elements which could be added to it.
Claims (5)
- (1) dissolving a specific amount of Bi(NO3)3’5H2O in an ethylene glycol solution and stirring for 20 min to 40 min, dissolving a specific amount of KI in an ethylene glycol solution and stirring for 20 min to 40 min, adding the ethylene glycol solution of the KI to the ethylene glycol solution of the Bi(NO3)3’5H2O and stirring for 1 h to 1.5 h, transferring a mixed solution obtained to a high pressure hydrothermal reactor, conducting a hydrothermal reaction at 100°C to 200°C for 10 h to 14 h, conducting cooling after the reaction is finished, and filtering out precipitate;1. A preparation method of a Bi/BiOI nanosheet photocatalyst, comprising the following steps:
- 2. The preparation method of a Bi/BiOI nanosheet photocatalyst according to claim 1, wherein a molar ratio of the Bi(NO3)3’5H2O to the KI is (0.9 to 1):1.(2) cleaning the precipitate with deionized water and ethanol, and drying the precipitate to obtain BiOI nano flower-like spheres; and (3) cleaning and drying the BiOI nano flower-like spheres obtained in step (2), placing the BiOI nano flower-like spheres into a tube furnace filled with N2 as shielding gas, for heat treatment, holding at 300°C to 600°C for 1 h to 3 h, and naturally cooling to room temperature to obtain a Bi/BiOI nanosheet photocatalyst.
- 3. The preparation method of a Bi/BiOI nanosheet photocatalyst according to claim 1, wherein the hydrothermal reaction is conducted at 120°C to 180°C for 12 h.
- 4. The preparation method of a Bi/BiOI nanosheet photocatalyst according to claim 1, wherein heat treatment is holding at 400°C to 500°C for 2 h by using N2 as shielding gas.
- 5. A Bi/BiOI nanosheet photocatalyst, wherein the Bi/BiOI nanosheet photocatalyst is prepared by using the preparation method of a Bi/BiOI nanosheet photocatalyst according to any one of claims 1 to 4.
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