CN114524457A - Bismuth oxychloride crystal and preparation method and application thereof - Google Patents

Bismuth oxychloride crystal and preparation method and application thereof Download PDF

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CN114524457A
CN114524457A CN202210071933.4A CN202210071933A CN114524457A CN 114524457 A CN114524457 A CN 114524457A CN 202210071933 A CN202210071933 A CN 202210071933A CN 114524457 A CN114524457 A CN 114524457A
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bismuth
bismuth oxychloride
crystal
oxychloride crystal
water
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谢小莉
刘乔木
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South China University of Technology SCUT
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    • CCHEMISTRY; METALLURGY
    • C01INORGANIC CHEMISTRY
    • C01GCOMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
    • C01G29/00Compounds of bismuth
    • CCHEMISTRY; METALLURGY
    • C01INORGANIC CHEMISTRY
    • C01PINDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2002/00Crystal-structural characteristics
    • C01P2002/70Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data
    • C01P2002/72Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data by d-values or two theta-values, e.g. as X-ray diagram
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    • C01INORGANIC CHEMISTRY
    • C01PINDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2004/00Particle morphology
    • C01P2004/01Particle morphology depicted by an image
    • C01P2004/03Particle morphology depicted by an image obtained by SEM
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    • C01INORGANIC CHEMISTRY
    • C01PINDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2006/00Physical properties of inorganic compounds
    • C01P2006/60Optical properties, e.g. expressed in CIELAB-values
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Abstract

The invention discloses a preparation method of a bismuth oxychloride crystal, which comprises the following steps of carrying out reflux reaction on a bismuth source, a chlorine source and water in an organic solvent at normal pressure to prepare a suspension, naturally cooling a product to 35-40 ℃, adding water, oscillating, standing for layering or carrying out centrifugal precipitation, washing precipitates for 2-3 times with water and absolute ethyl alcohol respectively, and carrying out vacuum drying at 40-80 ℃ to obtain the bismuth oxychloride crystal, wherein the synthesis equation in the preparation process is as follows: bi3++H2O+Cl=BiOCl↓+2H+. The preparation method has the advantages of simple process, mild reaction conditions, low cost, stable quality and high yield; the prepared bismuth oxychloride crystal has controllable morphology, obvious pearlescent effect, good adhesive force and good weather resistance.

Description

Bismuth oxychloride crystal and preparation method and application thereof
Technical Field
The invention relates to the technical field of inorganic material chemical industry, in particular to a bismuth oxychloride crystal and a preparation method and application thereof.
Background
Bismuth oxychloride (BiOCl) is a ternary structure oxide composed of main group elements V-VI-VII, has a typical crystal structure of tetragonal lead fluorochloride ore, is a layered structure formed by combining Cl-Bi-O-Bi-Cl repeating units through smaller van der Waals force among Cl atomic layers and simultaneously stacking and arranging the Cl-Bi-O-Bi-Cl repeating units alternately along the c axis, and has high anisotropy. The bismuth oxychloride crystal has the same attractive pearl luster as mica titanium pearlescent pigment, has extremely fine and smooth mercerizing effect which the mica titanium pearlescent pigment does not have, has unique surface attachment characteristic and smoothness, is safe, non-toxic and good in compatibility, can be used as the pearlescent pigment to be applied to cosmetics, coatings, printing ink, ceramics, plastics, leather, clothing ornaments, automotive interior materials, electronic products, sports goods and the like, and can be used for manufacturing dry battery cathodes and used as photocatalysts in various occasions such as water pollution treatment, air purification and the like.
At present, the synthesis methods of BiOCl are mainly hydrolysis method and solvothermal method (hydrothermal method). The synthesis of pearlescent pigment mainly uses hydrolysis method, which is simple and low in cost, however, concentrated hydrochloric acid, nitric acid and the like are often needed to adjust the pH value of the solution (see patent documents CN1675317A, CN1678693A, CN103130275A, CN103303975A, CN104310471A, CN104828780A, CN108864758B, CN108910946A, CN109077941B, CN103232731A, CN1653139A, CN101935022A, CN101804965A, CN109678207A, CN104131353A, CN109749483A, US5149369A and EP0315849a1), which is not environment-friendly. The solvothermal method is mainly used for preparing the photocatalyst, is still the hydrolysis of bismuth salt, can not use concentrated hydrochloric acid but needs to adopt a closed pressure-resistant reaction kettle to provide a high-temperature and high-pressure environment to promote the hydrolysis reaction (see patent documents CN108502926A, CN1730568A, CN110560097A, CN110550657A, CN110201685A, CN110193373A, CN109985644A, CN110344239A, CN109590026A, CN110237810A and CN109943336A), has high equipment cost, high reaction temperature, long reaction time, high carbon emission, unsatisfactory finished products and inferior brightness, and is not suitable for industrial production.
Therefore, in order to solve the problems, the preparation method of the bismuth oxychloride crystal, which is simple in process operation, easy for industrial production and stable in product quality, is developed, and the bismuth oxychloride crystal which is controllable in synthetic morphology, has a good bright effect, high brightness and pearlescent luster, meets the social requirements, and has important significance.
Disclosure of Invention
In order to overcome the defects and shortcomings of the prior art, the invention aims to provide a preparation method of bismuth oxychloride crystals.
The second purpose of the invention is to provide the bismuth oxychloride crystal prepared by the preparation method.
The third purpose of the invention is to provide the application of the bismuth oxychloride crystal.
The primary purpose of the invention is realized by the following technical scheme:
a preparation method of a bismuth oxychloride crystal comprises the steps of carrying out reflux reaction on a bismuth source, a chlorine source and water in an organic solvent at normal pressure to prepare a suspension, naturally cooling a product to 35-40 ℃, adding water, oscillating, standing for layering or carrying out centrifugal precipitation, washing precipitates for 2-3 times with water and absolute ethyl alcohol respectively, and carrying out vacuum drying at 40-80 ℃ to obtain the bismuth oxychloride crystal.
The synthesis equation in the preparation process is as follows:
Bi3++H2O+Cl-=BiOCl↓+2H+
preferably, the bismuth source is a bismuth-containing salt, including but not limited to bismuth nitrate and its hydrates, bismuth chloride and its hydrates, bismuth citrate.
Preferably, the chlorine source is a chlorine-containing salt, including but not limited to potassium chloride, sodium chloride, and ammonium chloride.
Preferably, the organic solvent is a mixture of high boiling point organic solvents.
Preferably, the high boiling point organic solvent includes, but is not limited to, at least one of glycerol, ethylene glycol, 1, 2-propanediol, 1, 3-propanediol, 1, 4-butanediol, 1, 5-pentanediol, 1, 6-hexanediol, pentanol, and β -phenylethyl alcohol.
Preferably, the molar ratio of bismuth atoms of the bismuth source to chlorine atoms of the chlorine source to water is 0.8-1.8: 1: 120 to 150.
Preferably, the reflux reaction temperature is 100-200 ℃, and the reflux reaction time is 2-12 hours.
Preferably, the reflux reaction temperature is 120-160 ℃, and the reflux reaction time is 2-4 hours.
Preferably, the vacuum drying temperature is 60 ℃.
Preferably, a polymer modifier and an inducer can also be added in the preparation of the bismuth oxychloride crystal.
Preferably, the polymer modifier is polyvinylpyrrolidone.
Preferably, the inducing agent includes, but is not limited to, citric acid, sodium citrate and hydrates thereof, potassium citrate and hydrates thereof, and the like.
The second purpose of the invention is realized by the following technical scheme:
a bismuth oxychloride crystal is prepared by the preparation method.
The third purpose of the invention is realized by the following technical scheme:
the application of the bismuth oxychloride crystal refers to the application in the fields of cosmetics, coatings, printing ink, ceramics, plastics, leather, clothing and ornaments, automotive interior materials, electronic products, sports goods and photocatalysis.
Compared with the prior art, the invention has the following advantages:
(1) the bismuth oxychloride crystal is prepared by reflux reaction of a bismuth source and a chlorine source in a mixed solvent under normal pressure; compared with a hydrolysis method and a solvothermal method, the preparation method has the advantages of simple and convenient process, mild reaction conditions, low cost, stable quality and high yield;
(2) the bismuth oxychloride crystal prepared by the invention has controllable morphology, obvious pearlescent effect, good adhesive force and good weather resistance, and has sufficient function as pearlescent pigment; the bismuth oxychloride crystal prepared by the invention is particularly suitable for cosmetics, coatings, printing ink, ceramics, plastics, leather, clothing ornaments, automotive interior materials, electronic products and sports goods, and can also be used in the fields of photocatalysis and the like.
Drawings
In order to more clearly illustrate the embodiments or technical solutions of the present invention, the drawings that are needed in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.
FIG. 1 is an X-ray diffraction pattern of a bismuth oxychloride crystal prepared in example 1, wherein the ordinate is relative intensity and the abscissa is diffraction angle;
FIG. 2 is a scanning electron micrograph of a bismuth oxychloride crystal prepared in example 1, wherein a scale is shown in the lower right corner of FIGS. a, b, c and d, and FIG. d is an enlarged view of the encircled portion of FIG. a;
FIG. 3 is a 50000 times electron micrograph of bismuth oxychloride crystals prepared in example 2;
FIG. 4 is a 50000 times electron micrograph of bismuth oxychloride crystals prepared in example 3;
FIG. 5 is a 50000 times electron micrograph of the bismuth oxychloride crystal prepared in example 4, and the inset in the upper right corner is its 20000 times electron micrograph;
FIG. 6 is a 50000 times electron micrograph of bismuth oxychloride crystals prepared in example 5;
FIG. 7 is a 50000 times electron micrograph of bismuth oxychloride crystals prepared in example 6;
fig. 8 is a graph of uv-vis reflectance spectra in air for examples 1 to 6, wherein the ordinate represents percent reflectance and the abscissa represents test wavelength.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but the embodiments of the present invention are not limited thereto.
Example 1:
19.4g of bismuth nitrate pentahydrate, 3g of potassium chloride, 100mL of water and 700mL of glycerol were mixed in a reaction vessel equipped with a stirrer, a heater and a condensing reflux apparatus, stirred at room temperature for 3 hours, and then heated to 120 ℃ and refluxed for 3 hours to obtain a suspension. Naturally cooling to 35 ℃, adding water, oscillating, standing for layering, removing supernatant, washing the precipitate with water and absolute ethyl alcohol for 3 times respectively, and vacuum drying at 60 ℃ to obtain the bismuth oxychloride crystal.
Fig. 1 is an X-ray diffraction pattern of the bismuth oxychloride crystal prepared in this example, wherein the ordinate represents relative intensity and the abscissa represents diffraction angle. According to the standard spectrum of JCPDS NO.06-0249, the main diffraction peaks appear at 2 theta of 11.9 degrees, 25.9 degrees, 32.5 degrees, 33.4 degrees, 40.9 degrees, 46.6 degrees, 49.7 degrees, 54.1 degrees and 58.6 degrees, and respectively correspond to the (001), (101), (110), (102), (112), (200), (113), (211) and (212) crystal faces of BiOCl. This example is consistent with the XRD data in FIG. 1, which shows that the product prepared in this example is tetragonal bismuth oxychloride crystals.
Fig. 2 is a scanning electron micrograph of the bismuth oxychloride crystal prepared in the example, and in fig. 2, the lower right corner of fig. a, b, c and d is a scale, wherein, fig. d is an enlarged view of a circled part in fig. a. It can be seen that both micron-scale flower-ball-like structures and sheet-like structures exist. Theoretically, a structure is constructed by a bismuth-oxygen covalent bond preferentially in the reaction process, and more bismuth oxychloride 110 crystal faces are formed at the moment and are reflected to form 1-2 mu m flower-ball-shaped crystals with gaps; the crystal structure grows towards the c-axis vertical direction, more shows a 001 crystal face, and accords with the phenomenon that a small amount of sheet structures exist. In the process of wafer growth, due to the existence of smaller van der waals force between the chlorine atom layers, screw dislocation occurs in the process of growth, as shown in fig. d, the wafer is bent and stacked into clusters, and at this time, the 102 crystal plane is more exposed, which is consistent with the X-ray diffraction pattern and the bismuth oxychloride crystal structure of fig. 1. The pearl effect of the bismuth oxychloride comes from the interference of reflected light of different crystal planes.
Example 2:
19.41g of bismuth nitrate pentahydrate, 3g of potassium chloride, 6g of sodium citrate dihydrate, 100mL of water and 700mL of glycerol were mixed in a reaction vessel equipped with a stirrer, a heater and a condensing reflux device, stirred at room temperature for 1.5 hours, and then heated to 160 ℃ and refluxed for 9 hours to obtain a suspension. Naturally cooling to 40 ℃, adding water, oscillating, standing for layering, removing supernatant, washing the precipitate with water and absolute ethyl alcohol for 3 times respectively, and vacuum drying at 60 ℃ to obtain the bismuth oxychloride crystal.
FIG. 3 is a 50000 times electron micrograph of bismuth oxychloride crystals prepared in this example; as can be seen from fig. 3, the sample of bismuth oxychloride crystals exhibited spherulites consisting of platelets, similar to those in example 1, with particle sizes of: example 1> example 2.
Example 3:
19.41g of bismuth nitrate pentahydrate, 3g of potassium chloride, 10g of polyvinylpyrrolidone, 3g of sodium citrate dihydrate, 100mL of water and 700mL of glycerol were mixed in a reaction vessel equipped with a stirrer, a heater and a condensing reflux device, stirred at room temperature for 1.5 hours, and then heated to 120 ℃ and refluxed for 12 hours to obtain a suspension. Naturally cooling to 35 ℃, adding water, oscillating, centrifuging, washing the precipitate with water and absolute ethyl alcohol for 3 times respectively, and carrying out vacuum drying at 60 ℃ to obtain the bismuth oxychloride crystal.
Fig. 4 is a 50000 times electron micrograph of the bismuth oxychloride crystal prepared in this example, and it can be seen from fig. 4 that the bismuth oxychloride crystal sample grows into larger lamellae from the lamellae similar to the sample in example 1, and spherical particles are distributed among the lamellae.
Example 4
19.4g of bismuth nitrate pentahydrate, 3g of potassium chloride, 10g of polyvinylpyrrolidone, 9g of sodium citrate dihydrate, 100mL of water and 700mL of glycerol were mixed in a reaction vessel equipped with a stirrer, a heater and a condensing reflux device, stirred at room temperature for 3 hours, and then heated to 160 ℃ to reflux for 6 hours, thereby obtaining a suspension. Naturally cooling to 40 ℃, adding water, oscillating, standing for layering, removing supernatant, washing the precipitate with water and absolute ethyl alcohol for 3 times respectively, and vacuum drying at 60 ℃ to obtain the bismuth oxychloride crystal.
FIG. 5 is a 50000 times electron micrograph of the bismuth oxychloride crystal prepared in this example, and the inset in the upper right corner is its 20000 times electron micrograph; as can be seen from fig. 5, the sample of bismuth oxychloride crystals exhibited spherulites consisting of platelets, similar to those in example 1, with particle sizes of: example 1> example 2> example 4; and example 2 was significantly more porous than example 4.
Example 5
19.41g of bismuth nitrate pentahydrate, 3g of potassium chloride, 20g of polyvinylpyrrolidone, 6g of sodium citrate dihydrate, 100mL of water and 700mL of glycerol were mixed in a reaction vessel equipped with a stirrer, a heater and a condensing reflux device, stirred at room temperature for 3 hours, and then heated to 120 ℃ and refluxed for 6 hours to obtain a suspension. Naturally cooling to 35 ℃, adding water, oscillating, centrifuging, washing the precipitate with water and absolute ethyl alcohol for 3 times respectively, and carrying out vacuum drying at 60 ℃ to obtain the bismuth oxychloride crystal.
FIG. 6 is a 50000 times electron micrograph of bismuth oxychloride crystals prepared in this example; as can be seen from fig. 6, the sample of bismuth oxychloride crystals had both flat-laid sheets of spherical particles and square-shaped sheets grown like sheets in the sample of example 1.
Example 6
19.4g of bismuth nitrate pentahydrate, 3g of potassium chloride, 30g of polyvinylpyrrolidone, 9g of sodium citrate dihydrate, 90mL of water and 700mL of glycerol were mixed in a reaction vessel equipped with a stirrer, a heater and a condensing reflux device, stirred at room temperature for 3 hours, and then heated to 120 ℃ and refluxed for 9 hours to obtain a suspension. Naturally cooling to 35 ℃, adding water, oscillating, centrifuging, washing the precipitate with water and absolute ethyl alcohol for 3 times respectively, and carrying out vacuum drying at 60 ℃ to obtain the bismuth oxychloride crystal.
FIG. 7 is an electron micrograph of bismuth oxychloride crystals prepared in this example at 50000 times; as can be seen from fig. 7, the sample of bismuth oxychloride crystals had plate-like growth into larger lamellae similar to that of the sample of example 1, with spherical particles distributed between the lamellae.
The actual reflux vapor temperature during the reaction of examples 1 to 6 and the yield of bismuth oxychloride crystals prepared, the pearlescent gloss (visual inspection) are shown in table 1.
TABLE 1
Examples of the invention Reflux steam temperature/. degree.C Yield/%) Pearlescent luster (visual inspection)
Example 1 109 99.79 Good taste
Example 2 137 95.86 Good taste
Example 3 108 77.24 Is preferably used
Example 4 138 22.11 Good taste
Example 5 112 20.05 (near half loss at centrifugation) With metallic luster
Example 6 114 46.41 Good taste
Fig. 8 is a graph of uv-vis reflectance spectra in air for examples 1 to 6, wherein the ordinate represents percent reflectance and the abscissa represents test wavelength. According to optical theory, the larger the difference between the refractive indices of a substance and the surrounding medium, the higher the reflectivity of the substance. From FIG. 8, it can be seen that the reflectance in the visible light region, i.e., between wavelengths of 400-800 nm, of examples 1-6 all exceed 40%, indicating that the value of the refractive index is higher, and compared with the reflectance of the foreign mica-titanium dioxide pearlescent pigment (Zhang Shi, Wangberkang, Unihenzhen, Wangshi. measurement of gloss and reflectance of mica pearlescent pigment [ J ]. coating industry, 1995(01):34-35+46), the higher the reflectance under white light, the better the pearlescent gloss, which is consistent with the results in Table 1.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.

Claims (10)

1. A preparation method of a bismuth oxychloride crystal is characterized in that a bismuth source, a chlorine source and water are subjected to reflux reaction in an organic solvent at normal pressure to prepare turbid liquid, the product is naturally cooled to 35-40 ℃, water is added for oscillation, then the turbid liquid is subjected to standing layering or centrifugal precipitation, precipitates are respectively washed for 2-3 times by water and absolute ethyl alcohol, and the precipitates are dried in vacuum at 40-80 ℃ to obtain the bismuth oxychloride crystal, wherein the synthesis equation in the preparation process is as follows: bi3++H2O+Cl-=BiOCl↓+2H+
2. The method for preparing a bismuth oxychloride crystal of claim 1, wherein the bismuth source is a bismuth-containing salt including but not limited to bismuth nitrate and its hydrate, bismuth chloride and its hydrate, and bismuth citrate.
3. The method for preparing bismuth oxychloride crystals of claim 1, wherein the chlorine source is a chlorine-containing salt, including but not limited to potassium chloride, sodium chloride and ammonium chloride.
4. The method for producing a bismuth oxychloride crystal according to claim 1, wherein the organic solvent is a mixture of high-boiling point organic solvents.
5. The method for preparing bismuth oxychloride crystals according to claim 5, wherein the high-boiling organic solvent includes, but is not limited to, at least one of glycerol, ethylene glycol, 1, 2-propanediol, 1, 3-propanediol, 1, 4-butanediol, 1, 5-pentanediol, 1, 6-hexanediol, pentanediol, and β -phenylethyl alcohol.
6. The method for producing a bismuth oxychloride crystal according to claim 1, wherein the molar ratio of bismuth atoms of the bismuth source to chlorine atoms of the chlorine source to water is 0.8 to 1.8: 1: 120-150.
7. The method for preparing a bismuth oxychloride crystal according to claim 1, wherein the reflux reaction temperature is 100 to 200 ℃ and the reflux reaction time is 2 to 12 hours.
8. The method for preparing bismuth oxychloride crystals according to claim 1, wherein a polymer modifier and an inducer can be further added to the preparation of the bismuth oxychloride crystals.
9. A bismuth oxychloride crystal characterized by being produced by the production method according to any one of claims 1 to 8.
10. The application of the bismuth oxychloride crystal is characterized in that the application of the bismuth oxychloride crystal is in the fields of cosmetics, coatings, printing ink, ceramics, plastics, leather, clothing and ornaments, automotive interior materials, electronic products, sports goods and photocatalysis.
CN202210071933.4A 2022-01-21 2022-01-21 Bismuth oxychloride crystal and preparation method and application thereof Pending CN114524457A (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1252797A (en) * 1968-06-12 1971-11-10
CN108525702A (en) * 2018-04-16 2018-09-14 成都新柯力化工科技有限公司 A kind of support type bismuth oxychloride photocatalyst and preparation method for sewage disposal
CN110013864A (en) * 2019-04-30 2019-07-16 西北师范大学 The preparation of cobalt acid nickel/bismuthyl chloride nano composite material and its application in catalysis reduction organic matter
CN110639610A (en) * 2019-09-18 2020-01-03 江苏大学 Preparation method and application of defect-rich BiOCl/TPP composite photocatalyst
CN112264053A (en) * 2020-11-04 2021-01-26 南京工业大学 Synthesis method of CdSe-BiOCl heterojunction
CN113174146A (en) * 2021-04-30 2021-07-27 吉林工程技术师范学院 Preparation method of bismuth oxychloride pearlescent pigment

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1252797A (en) * 1968-06-12 1971-11-10
CN108525702A (en) * 2018-04-16 2018-09-14 成都新柯力化工科技有限公司 A kind of support type bismuth oxychloride photocatalyst and preparation method for sewage disposal
CN110013864A (en) * 2019-04-30 2019-07-16 西北师范大学 The preparation of cobalt acid nickel/bismuthyl chloride nano composite material and its application in catalysis reduction organic matter
CN110639610A (en) * 2019-09-18 2020-01-03 江苏大学 Preparation method and application of defect-rich BiOCl/TPP composite photocatalyst
CN112264053A (en) * 2020-11-04 2021-01-26 南京工业大学 Synthesis method of CdSe-BiOCl heterojunction
CN113174146A (en) * 2021-04-30 2021-07-27 吉林工程技术师范学院 Preparation method of bismuth oxychloride pearlescent pigment

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Title
GANG CHENG ET AL.: "Facile template-free and fast refluxing synthesis of 3D desertrose-like BiOCl nanoarchitectures with superior photocatalytic activity", 《RSC PUBLISHING》 *

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Application publication date: 20220524