76 results about "Bismuth oxychloride" patented technology

The invention belongs to the technical field of photocatalytic materials, and particularly relates to a graphite-phase carbon nitride / iron-doped bismuth oxychloride heterojunction photocatalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: firstly, putting urea into a crucible with a cover, and calcining in air by utilizing a thermal polymerization method to obtain graphite-phase carbon nitride; then uniformly dispersing the graphite phase carbon nitride into a mannitol solution in which bismuth nitrate pentahydrate is dissolved, then adding ferric nitrate nonahydrate and potassium chloride into the solution, and obtaining the graphite phase carbon nitride / iron-doped bismuth oxychloride heterojunction photocatalyst by utilizing a hydrothermal method. The formation of the heterojunction can greatly improve the activity of the graphite-phase carbon nitride in photocatalytic reduction of carbon dioxide.

The present application relates to a kind of preparation method of bismuth trifluoride, belong to bismuth compound preparation technical field.The preparation method of bismuth trifluoride of the present application includes the following steps: bismuth-containing compound powder is hydrothermally reacted with hydrofluoric acid;The bismuth-containing compound is one or any combination of bismuth oxide, bismuth oxychloride, bismuth trichloride.The preparation method of bismuth trifluoride of the present application carries out hydrothermal reaction to bismuth oxide, bismuth oxychloride, bismuth trichloride and hydrofluoric acid, and the high temperature and high pressure generated by hydrothermal reaction are used to improve the reactivity, solve the problem that bismuth oxide, bismuth oxychloride and bismuth trichloride are not completely reacted with hydrofluoric acid under normal pressure, resulting in low yield and low purity, product can be obtained by one-step reaction.The preparation method of bismuth trifluoride of the present application is simple, and route is short, the solvent used is water, cost is low, yield is high, and it is economic and environmental protection.

The invention relates to a method and device for preparing urea through photocatalysis and piezoelectric catalysis of CO2, and the method comprises the following steps: adding a catalyst into water, introducing CO2 and N2 into the water, and reacting under the action of illumination and ultrasonic waves to obtain a urea solution; the light intensity of illumination ranges from 200 mW / cm < 2 > to 300 mW / cm < 2 >; the catalyst is selected from one or more of CdS (cadmium sulfide), ZnO (zinc oxide), WO3 (tungsten trioxide), BiOCl (bismuth oxychloride) and Bi4NbO8Cl (bismuth oxychloride). The technical problem to be solved is to provide a method for preparing urea by photocatalysis and piezoelectric catalysis of CO2, according to the method, under the action of illumination, ultrasonic waves and a catalyst, photocatalysis and piezoelectric catalysis of CO2 are combined, urea synthesis can be carried out at normal temperature and normal pressure, the yield of urea can be improved, and a new direction is developed for green and efficient synthesis of urea. Furthermore, the device can integrate air carbon capture coupling photocatalysis and piezoelectric catalysis CO2 preparation of urea into a set of continuous device, a large amount of energy input is not needed, multi-step separation can be avoided, the device is simple, and the cost can be greatly reduced.

The invention discloses a preparation method of a Schottky composite material, a coating, an antibacterial stent and application, and belongs to the field of biological materials. According to the preparation method, Pdene of a two-dimensional structure is prepared through a wet chemical reduction method, then bismuth oxychloride (BiOCl) nanoflowers are grown on metal alkene (Pdene) in situ through an electrostatic adsorption mode, the obtained schottky composite material can regulate and control interface charge redistribution, the adsorption energy of reaction intermediate products is optimized, meanwhile, the piezoelectric property of BiOCl is enhanced, and the performance of the schottky composite material is improved. Bacterial oxidative stress can be effectively promoted, bacterial energy metabolism is interfered, finally, efficient removal of bacteria is achieved, and hard tissue repair is promoted.

This invention provides iodine-doped bismuth oxychloride nanosheets, their preparation method, and applications. The preparation method of iodine-doped bismuth oxychloride nanosheets includes: reacting C7H... 13 IN2 is dissolved in anhydrous acetic acid, and then Bi(NO3)3·5H2O is added and stirred to obtain suspension A. KCl is dissolved in water to obtain solution B. Solution B is added dropwise to suspension A, and then polyethylene glycol is added to obtain suspension C. Suspension C is transferred, reacted, filtered, and washed, and then dispersed in anhydrous ethanol and dried to obtain iodine-doped bismuth oxychloride bulk. The iodine-doped bismuth oxychloride bulk is mechanically exfoliated and transferred onto a SiO2 / Si substrate to obtain the final product. The application of iodine-doped bismuth oxychloride nanosheets involves photolithography, development, and sputtering to prepare Pt / I-BiOCl / Pt memristor devices. The iodine-doped bismuth oxychloride nanosheets prepared in this invention exhibit good analog resistive switching performance and can be used to prepare synaptic memristors.

The invention discloses a nitrogen-doped carbon layer coated bismuth oxychloride composite photocatalyst and a preparation method thereof, the catalyst comprises bismuth oxychloride nanoflowers, the surfaces of the bismuth oxychloride nanoflowers are modified with oxygen vacancies, and the surfaces of the bismuth oxychloride nanoflowers are coated with nitrogen-doped carbon layers. The preparation method comprises the following steps: mixing the nitrogen-doped hollow carbon spheres, bismuth salt and ethylene glycol, adding chlorine salt, and carrying out hydrothermal reaction to obtain the nitrogen-doped carbon layer coated bismuth oxychloride composite photocatalyst. Compared with a conventional bismuth oxychloride-based photocatalyst, the nitrogen-doped carbon layer-coated bismuth oxychloride composite photocatalyst has the advantages of high overall photocatalytic activity, strong singlet oxygen generation capability, good selectivity, good stability, strong practicability, high use value and good application prospect, and can be widely applied to synthesis of hydrogen peroxide and degradation of organic pollutants. The preparation method has the advantages of being simple in process, convenient to operate and the like, the structural integrity of bismuth oxychloride cannot be damaged, and in-situ synergistic enhancement between bismuth oxychloride and the nitrogen-doped carbon layer can be achieved.

The invention belongs to the technical field of photocatalytic plastic degradation, and particularly relates to a chlorine free radical photocatalyst, a preparation method thereof and application of the chlorine free radical photocatalyst to plastic degradation. The chlorine free radical photocatalyst is a bismuth oxychloride photocatalyst rich in oxygen vacancies; the bismuth oxide is obtained through solvothermal reaction of bismuth salt and halide, washing and drying. According to the photocatalyst, Cl <-> free radicals are generated in situ through photo-generated hole oxidation interlayer Cl <-> in a sodium chloride solution system, and a hydrogen atom transfer reaction of a polyolefin C-H bond is initiated; cl. Free radicals form carbon center free radicals by capturing hydrogen atoms of a polyethylene molecular chain, a beta-chain breakage mechanism is triggered in the presence of oxygen, and controllable cracking of a C-C bond is realized to generate a high-added-value liquid product; therefore, the photocatalyst is used for degradation of polyolefin plastics, and degradation products comprise carbon dioxide, alcohols, acids and other products with high added values. The photocatalyst has good chemical stability and photocatalytic activity, is free of additional photosensitizer and sacrificial agent, and is suitable for large-scale industrial application.

This invention belongs to the field of environmental material preparation technology, and specifically relates to a method for preparing a silver / bismuth oxychloride / bismuth oxide / carbon fiber composite photocatalyst, comprising the following steps: A. Mixing carbon fiber with bismuth nitrate solution to react and obtain bismuth oxide / carbon fiber; B. Reacting the bismuth oxide / carbon fiber obtained in step A with bismuth nitrate solution and hexadecyltrimethylammonium chloride solution to obtain bismuth oxychloride / bismuth oxide / carbon fiber; C. Taking the bismuth oxychloride / bismuth oxide / carbon fiber obtained in step B, carrying out a photoreduction reaction in silver nitrate solution, and obtaining a flexible silver / bismuth oxychloride / bismuth oxide / carbon fiber photocatalyst after washing and drying.

The invention belongs to the technical field of cosmetics, and particularly relates to an anti-darkness powder make-up composition and a preparation method thereof. According to the anti-darkness powder make-up composition provided by the invention, the oil control capacity of the anti-darkness powder make-up composition is enhanced by carrying out alkali treatment modification on the polymethylsilsesquioxane, and the anti-darkness powder make-up composition is matched with nonionic silicon surfactants such as tricalcium phosphate, bismuth oxychloride, trimethoxysilyl polydimethylsiloxane / trimethylsiloxy ammonia-terminated polydimethylsiloxane and the like; the anti-darkness powder makeup fixing composition has the effects of instantly brightening the skin color and resisting darkness for a long time, so that the technical problem that the makeup is easy to become dark after makeup fixing in the prior art is solved.

The present application belongs to the technical field of electrocatalytic materials, and particularly relates to a cobalt-doped bismuth-based electrocatalytic material, a preparation method and application. The electrocatalytic material prepared by the present application comprises cobalt-doped metallic bismuth and bismuth oxychloride, and the two form a composite structure (Co-Bi / BiOCl). The preparation method is as follows: taking BiCl3 and a cobalt salt as raw materials, and preparing by one-step liquid-phase reduction with NaBH4. In the electrocatalytic reduction of CO2 to prepare formic acid, the formic acid faradaic efficiency reaches 98.7%, and the stability is excellent. The method of the present application is simple, mild in conditions, easy to scale up, and has good industrial application prospect.

The present invention relates to a solid cosmetic care and / or make-up composition for keratin materials, in particular for the skin, eyelids, eyebrows or lips, and to a cosmetic method implementing said composition. Specifically, the invention relates to a solid, preferably anhydrous, cosmetic care and / or make-up composition for keratin materials, comprising, in a physiologically acceptable medium: (i) bismuth oxychloride particles; (ii) boron nitride particles; and (ii) at least one wax; characterised in that it comprises less than 3% by weight of titanium dioxide based on the total weight of the composition, and in that it has a hardness of at least 30 Nm-1.

The present invention relates to a solid cosmetic composition for the care and / or makeup of keratinous materials, particularly those of the skin, eyelids, eyebrows, or lips, and a cosmetic process for its application. More particularly, the invention relates to a cosmetic composition, preferably anhydrous, in solid form for the care and / or makeup of keratinous materials, comprising, in a physiologically acceptable medium: (i) Bismuth oxychloride particles; (ii) Boron nitride particles; and (iii) At least one wax; characterized in that it comprises less than 3% by weight of titanium dioxide relative to the total weight of the composition and has a hardness of at least 30 Nm⁻¹.

The present application relates to a kind of for CO2 reduction CsPbBr3 quantum dot / BiOCl heterojunction photocatalyst and its preparation method, the preparation method has the following steps: with bismuth oxychloride and lead nitrate is added to aqueous solution, freeze-drying after ultrasonic, by muffle furnace calcination, obtain precursor material;CsPbBr3 quantum dot / BiOCl heterojunction photocatalyst is obtained by two-step calcination method again by adding cesium bromide and potassium bromide, dissolving, ultrasonic, freeze-drying, by muffle furnace calcination its feature is.CsPbBr3 quantum dot / BiOCl heterojunction photocatalyst prepared has excellent performance and good cycle stability.The drug used in preparation is easily obtained and low in price, and preparation is simple and short in time.CsPbBr3 quantum dot / BiOCl heterojunction photocatalyst prepared can be successfully applied in the field of photocatalytic CO2 reduction.

The invention belongs to the technical field of inorganic functional materials, and provides a bismuth oxychloride coated mica composite material as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing mica, a pH value regulator and water to obtain a mica suspension; mixing a bismuth source, a chlorine source and water to obtain a mixed raw material solution; mixing the mica suspension liquid with the mixed raw material liquid, and carrying out an in-situ precipitation reaction to obtain a bismuth oxychloride coated mica composite material precursor; and carrying out heat treatment on the bismuth oxychloride coated mica composite material precursor to obtain the bismuth oxychloride coated mica composite material. The method is simple and mild in condition, the prepared bismuth oxychloride coated mica composite material does not harm human health, the particle size distribution and dispersion performance of bismuth oxychloride are improved, agglomeration is not prone to occurring, and the bismuth oxychloride coated mica composite material has wide application prospects in manufacturing of high-end cosmetics.

The invention relates to a bismuth oxychloride / bismuth molybdate composite photocatalyst as well as a preparation method and application thereof, and belongs to the technical field of photocatalytic materials. The preparation method of the bismuth oxychloride / bismuth molybdate composite photocatalyst comprises the following steps: S1, dissolving Bi (NO3) 3.5 H2O in an HNO3 solution, uniformly mixing and stirring at room temperature, and marking as a solution A; dissolving NaCl and Na2MoO4. 2H2O in water, uniformly stirring at room temperature, and marking as a solution B; s2, slowly dropwise adding the solution B into the solution A, and stirring at normal temperature after dropwise adding to obtain a mixed solution; s3, the mixed solution is subjected to a hydrothermal reaction, after the reaction is completed, an obtained product is centrifuged, washed and dried, and the BiOCl / Bi2MoO6 composite photocatalyst is obtained. Compared with single BiOCl and Bi2MoO6 photocatalytic materials, the BiOCl / Bi2MoO6 photocatalytic material disclosed by the invention has the advantages of better performance, low synthesis cost, low energy consumption and simple synthesis process; the method is suitable for industrial and batch production, and the obtained photocatalyst has a wide application prospect.

The invention discloses a spherical bismuth oxychloride and tin oxide composite material as well as a preparation method and application thereof, and belongs to the field of catalyst technology and electro-catalysis application. According to the spherical bismuth oxychloride and tin oxide composite material, bismuth salt and organic acid serve as raw materials, an organic solvent and hydroxylamine hydrochloride are added under high-speed stirring, then spherical bismuth oxychloride is obtained through a hydrothermal reaction, finally, the spherical bismuth oxychloride and tin salt are physically mixed, and the spherical bismuth oxychloride and tin oxide composite material is obtained. And placing in a muffle furnace for high-temperature calcination to obtain the spherical bismuth oxychloride and tin oxide composite material. The composite material product has extremely high selectivity under an alkaline condition, and high-yield preparation of alkaline hydrogen peroxide is realized by combining a self-made flow type electric reactor. The electrocatalyst prepared by the method disclosed by the invention has extremely high selectivity and high yield for electrocatalytic preparation of hydrogen peroxide, and has a good application prospect in a reaction for realizing on-site in-situ production of hydrogen peroxide.

The utility model relates to the technical field of automobile surface coatings, in particular to an ultraviolet excitation bismuth oxychloride-containing nano coating for an automobile surface and an automobile. The coating can enhance the visual effect of the automobile surface and improve the safety. The light-emitting material is mainly composed of bismuth oxychloride (BiOCl)-containing nanoparticles, has strong light-emitting ability, and can emit continuous light in an ultraviolet environment. The coating not only has good visible light absorption and luminescence properties, but also has excellent wear resistance, weather resistance and adhesive force, is suitable for being coated on the external surface of an automobile, and can improve the visibility and safety of the automobile.

This invention belongs to the field of catalyst technology, and relates to a porous carbon-coated bismuth oxychloride nanoparticle catalyst for the electrocatalytic synthesis of formic acid from carbon dioxide, its preparation method, and its application. The porous carbon-coated bismuth oxychloride nanoparticle catalyst for the electrocatalytic synthesis of formic acid from carbon dioxide comprises the following steps: S1. Mixing Bi metal salt, hydroxylamine hydrochloride, and tricresylbenzene in a solvent to obtain a solution; S2. Subjecting the solution from step S1 to a hydrothermal reaction, drying, and carbonization treatment sequentially to obtain the porous carbon-coated bismuth oxychloride nanoparticle catalyst. This invention exhibits high formic acid Faradaic efficiency in the electrocatalytic synthesis of formic acid from carbon dioxide, and also possesses excellent electrochemically active specific surface area and a larger current density, solving the problem of limited electron transport rate.

The invention discloses a preparation method and application of a bismuth oxychloride / tungsten trioxide / carbon quantum dot composite photocatalyst, relates to the field of photocatalytic materials, and aims to solve the problem that an existing BiOCl / CQDs composite photocatalyst is insufficient in CO2 photocatalytic reduction performance. The method comprises the following steps: 1, preparing a WO3 nanorod; 2, mixing the lignin carbon quantum dot solution with ethylene glycol to obtain a mixed solution; 3, adding WO3, Bi (NO3) 3.5 H2O and KCl into the mixed solution together, stirring until dissolving, and reacting; and 4, naturally cooling the reaction kettle to room temperature, and washing and drying the obtained precipitate to obtain the BiOCl / WO3 / NLCQDs composite photocatalyst. The ternary composite catalytic system constructed by the invention has the advantage that the catalytic activity is obviously improved. The preparation method is used for preparing the bismuth oxychloride / tungsten trioxide / carbon quantum dot composite photocatalyst.

The present invention belongs to the technical field of pigment production, and particularly relates to a production process of high-color-intensity organic pigments. The specific steps include: preparing a pigment slurry, preparing a composite slurry, pigmentation treatment, pressure filtration and washing, and preparing high-color-intensity organic pigments. In the production process of the present invention, the organic pigment filter cake is slurried and combined with bismuth oxychloride, which can effectively change the polarity of the organic pigment, improve the dispersibility, form a natural barrier for the organic pigment, and improve the coloring ability of the organic pigment. At the same time, the hydrolysis reagent triethanolamine is added and acts together with bismuth oxychloride to prepare organic pigments with small particle size and stability, making the organic pigments easy to dye functional chemical fibers. In the pigmentation stage, two solvents, DMF and NMP, are used in combination, which helps to better disperse the organic pigment particles and improve the efficiency of pigmentation treatment. The production process of the high-color-intensity organic pigments of the present invention is short in time, high in efficiency and environmentally friendly, and is applicable to a variety of organic pigments.

The present invention relates to a cosmetic composition comprising, in a physiologically acceptable medium, composite particles comprising a substrate formed from mica and from bismuth oxychloride coated with at least one mineral pigment and at least one nacre, chosen from composite particles comprising at least one support chosen from mica, synthetic fluorphlogopite or calcium sodium borosilicate, and completely or partially coated with one or more layers of metal oxides, in particular chosen from titanium dioxide, iron oxide, tin oxide and mixtures thereof.It also relates to the process for giving skin, and in particular facial skin, a uniform complexion and a rosy tonality, while at the same time retaining the natural appearance of the skin, which consists in applying at least one coat of a composition as defined above to the surface of the targeted skin.

This application relates to the field of new materials technology, specifically to a composite material of bismuth oxychloride and neodymium-doped aluminum phosphate, its preparation method, and its application. The composite material is composed of bismuth oxychloride and neodymium-doped aluminum phosphate. The bismuth oxychloride and neodymium-doped aluminum phosphate composite material of this invention possesses both photocatalytic and radiative cooling functions, exhibiting a significant synergistic effect.

The invention provides a method for comprehensively recovering selenium, tellurium, mercury, silver and lead from lead smelting acid mud, and belongs to the technical field of hazardous solid waste harmlessness and comprehensive resource recovery, and the method comprises the following steps: mixing the lead smelting acid mud, an activating agent and water, ball-milling and activating to obtain activated acid mud; carrying out low-acid oxidation leaching on the activated acid mud to obtain low-acid leaching liquid and low-acid leaching residues; carrying out high-acid oxidation leaching on the low-acid leaching residues to obtain high-acid leaching liquid; bismuth powder is added into the low-acid leaching liquid for tellurium enrichment reaction, and tellurium concentrate and tellurium enriched liquid are obtained; adding chlorine salt into the tellurium-enriched liquid, and reacting under a certain pH value to obtain bismuth oxychloride and bismuth-removed liquid; carrying out mercury enrichment on the bismuth removal liquid to obtain mercury-rich slag and mercury removal liquid; and adding a reducing agent into the mercury removal liquid to react to obtain crude selenium and reduced liquid. The method for comprehensively recovering selenium, tellurium, mercury, silver and lead from lead smelting acid mud provided by the invention is economical, efficient and environment-friendly, and can solve the problems that the acid mud containing elements such as selenium, tellurium, mercury, silver and lead is stockpiled, all valuable elements cannot be recovered, and the like.

The application discloses a complex bismuth type bismuth oxychloride / bismuth tungstate heterojunction photocatalytic material and a preparation method and application thereof in removing tetracycline in water bodies. 12 O 17 Cl2) is in a nanosheet structure, and the complex bismuth type bismuth oxychloride is attached on bismuth tungstate (Bi2WO6). The heterojunction material composed of bismuth tungstate and the complex bismuth type bismuth oxychloride has good stability, and the recovery mode is simple and the reusability is high. Through mixing the complex bismuth type bismuth oxychloride / bismuth tungstate heterojunction photocatalytic material with water bodies containing tetracycline and performing a photocatalytic reaction under visible light irradiation, efficient degradation of tetracycline in the water bodies can be realized.

The invention belongs to the technical field of photocatalysis, and particularly relates to a preparation method for constructing a heterojunction catalyst by polymerizing zinc phthalocyanine and bismuth oxychloride. The method provided by the invention comprises the following steps: S110: preparing raw materials: Bi (NO3) 3.5 H2O, ZnPPc and KCl; s120, Bi (NO3) 3.5 H2O and ZnPPc are dissolved in ethylene glycol, and a solution A is obtained; wherein the molar ratio of the Bi (NO3) 3.5 H2O to the ZnPPc is 100: (25-75); s130, after the solution A is fully mixed to be uniform, KCl is added, and after the KCl is fully dissolved, a solution B is obtained; wherein the molar ratio of the KCl to the Bi (NO3) 3.5 H2O is 1: 1; s140, putting the solution B into a reaction kettle, and reacting for preset time under a preset temperature condition; and S150, after the reaction is finished, carrying out suction filtration on a sample, and washing and drying the sample to obtain the BiOCl / ZnPPc heterojunction. The BiOCl / ZnPPc heterojunction prepared by the invention can promote a catalytic system to generate singlet oxygen to efficiently degrade electron-rich new pollutants in water, and CTC can be efficiently subjected to photocatalytic degradation by taking CTC as a target pollutant.

According to the magnetic single crystal thin film, the preparation method and the application thereof, a chemical vapor deposition method is adopted, high-melting-point chromium powder is used as a gas-phase slow-release regulating agent to construct a composite precursor with low-melting-point bismuth oxychloride powder, and key growth parameters such as the raw material proportion, the reaction temperature, the deposition time and the carrier gas flow are regulated and controlled through a system, so that the magnetic single crystal thin film is obtained. Under the condition that the temperature is lower than the traditional process temperature (300-450 DEG C), the Bi2-xCrxTe3 magnetic single crystal film with high crystal quality and consistent crystal orientation height is prepared, the Cr doping concentration of the Bi2-xCrxTe3 magnetic single crystal film is 0.1-2.0 at%, and the minimum thickness of the Bi2-xCrxTe3 magnetic single crystal film can reach 1.1 nm. The low-temperature preparation process provided by the invention has good semiconductor manufacturing compatibility, and a feasible material platform is provided for research of the magnetic topological insulator and application of the magnetic topological insulator in the fields of topological quantum devices, quantum spintronics and the like.

Bismuth oxyhalide composite material for filtering ultraviolet radiation. The present invention relates to the use, preferably cosmetic, of a composite material P comprising one or more particles of bismuth oxyhalide(s) (a), in particular bismuth oxychloride, and its solvates, such as its hydrates, the largest average dimension of said particles being less than 400 nm; and at least one chemically inert compound (b), selected from (b)i) organic compounds with a carboxy group, (b)ii) polymers, (b)iii) silicon organic compounds, and (b)iv) inorganic compounds, or mixtures thereof, for filtering UV radiation, preferably UV-B, as well as processes for preparing and composing cosmetic compositions. Figure for abstract: None

The invention provides a defect-rich bismuth oxychloride photocatalyst and a preparation method and application thereof.The method comprises the steps that bismuth nitrate pentahydrate and potassium chloride are dissolved and stirred in ethyl alcohol to obtain a dissolved solution, a solvothermal product is taken out to be alternately washed with ethyl alcohol and deionized water and placed in a vacuum oven to be dried, and the defect-rich bismuth oxychloride photocatalyst is obtained; the preparation method comprises the following steps: preparing a bismuth oxychloride carrier with oxygen vacancies, dissolving polypropylene pyrrolidone and anhydrous copper acetate in absolute ethyl alcohol, dropwise adding ascorbic acid into a stirring solution, stirring to react, alternately washing the reaction solution by using deionized water and ethyl alcohol, and drying to obtain copper nanoparticles. The preparation method comprises the following steps: adding a bismuth oxychloride carrier into a copper nanoparticle dispersion solution, carrying out ultrasonic dispersion in deionized water, putting the bismuth oxychloride carrier into the copper nanoparticle dispersion solution, stirring, standing, and freeze-drying in a liquid nitrogen environment to obtain the bismuth oxychloride photocatalyst. A semiconductor carrier with oxygen vacancies is prepared by adopting a simple ethanol solvothermal strategy, and CO2 reduction is catalyzed under an illumination condition to realize excellent acetic acid selectivity.

The invention provides a circulating dechlorination method for chlorine-containing wastewater. The circulating dechlorination method comprises the following steps: S1, adding bismuth sulfate into the chlorine-containing wastewater to carry out dechlorination reaction; s2, carrying out solid-liquid separation on the reaction liquid after the dechlorination reaction to obtain bismuth oxychloride; s3, bismuth oxychloride is dried at the temperature of 90-200 DEG C; s4, roasting the dried bismuth oxychloride and concentrated sulfuric acid at 200-300 DEG C to obtain bismuth sulfate; and S5, returning the bismuth sulfate obtained in the step S4 to the step S1. After the dechlorination reaction, the bismuth oxychloride slag is dried and then roasted, on one hand, excessive water in the bismuth oxychloride slag is prevented from being brought into concentrated sulfuric acid to corrode reaction equipment, on the other hand, the bismuth oxychloride slag can be roasted at the low temperature of 200-300 DEG C after being dried, and high-temperature corrosion of the equipment and high-temperature decomposition of sulfuric acid are prevented.