83results about How to "Wide photoresponse range" patented technology

The invention discloses a compound bismuthyl bromide photocatalyst which is prepared by processing Bi(NO3)3.5H2O, CTAB and Na2WO4.2H2O as raw materials through a one-step hydrothermal method, contains BiOBr and Bi2O3 / WO3 and is in a heterogeneous structure; the shape of the photocatalyst is a chrysanthemum-like crystal structure formed by crossing sheet units. The photocatalyst is better in photocatalytic performance; a conduction band and a valence band of BiOBr and Bi2O3 / Bi2O3 / WO3 in the chrysanthemum-like crystal structure are stepwise embedded, photo-induced electrons are transferred to the conduction band of BiOBr, and photo-induced holes are transferred to the valence band of Bi2O3 / Bi2O3 / WO3, so that the photo-induced carrier separation can be promoted; the photocatalyst is large in specific surface area, wide in optical response range and long in life of the photo-induced electrons and the photo-induced holes, and can be widely applied in the fields of environmental pollution control and the like.

The invention discloses perylenebisimide, a composite photocatalytic material thereof, a preparation method of the composite photocatalytic material and application of the composite photocatalytic material in removal of organic pollutants in a water body. The method comprises: calcining melamine to obtain melem; mixing the melem, perylenetetracarboxylicdianhydride and a solvent to obtain a mixture, and performing solvothermal reaction on the mixture in an inert atmosphere to obtain thebisimide; and dispersing the perylenebisimide into an aqueous solution containing a bismuth source and a tungsten source and carrying out hydrothermal reaction toobtain the perylenebisimide / bismuth tungstate composite photocatalytic material. According to the organic-inorganic composite photocatalytic material constructed by the invention, on one hand, the composite photocatalytic material has a wider spectral response range due to the introduction of a visible-light-responsive organic photocatalytic material; on the other hand, due to the introduction of an inorganic semiconductor catalyst, the composite material can generate active free radicals with higher oxidability, and the photocatalytic degradation performance of the composite material on the organic pollutants is enhanced, so that the constructed organic-inorganic composite photocatalytic material has excellent catalytic performance.

The invention discloses a plasma-type tungsten oxide-modified graphite phase carbon nitride nanosheet composite photocatalyst and a preparation method and application thereof. The composite photocatalyst comprises a plasma-type tungsten oxide and a graphite phase carbon nitride nanosheet. The plasma-type tungsten oxide attaches to the surface of the graphite phase carbon nitride nanosheet. The plasma-type tungsten oxide is W18O49. The preparation method comprises mixing the graphite phase carbon nitride nanosheet and a tungsten hexacarbonyl solution to obtain a precursor mixed solution and preparing a composite photocatalyst through a hydrothermal reaction. The composite photocatalyst has the advantages of high photocatalytic activity, wide photoresponse range, stable photocatalytic performance and good recyclability. The preparation method has the advantages of simple processes, operation easiness and low cost. The composite photocatalyst can be used for treating antibiotic waste water, can be used through a simple method, realizes a low cost, has a high removal rate, effectively degrades antibiotics in waste water and has a good application prospect.

The invention discloses a carboxyl-containing perylene bisimide / oxygen-doped carbon nitride nanosheet heterojunction photocatalyst as well as a preparation method and application thereof. The photocatalyst is formed by compounding carboxyl-containing perylene bisimide and an oxygen-doped carbon nitride nanosheet through electrostatic interaction and pi-pi interaction, wherein the mass ratio of theoxygen-doped carbon nitride nanosheet to the carboxyl-containing perylene bisimide ranges from 1: 0.001 to 1: 0.8. The carboxyl perylene bisimide is modified on the oxygen-doped carbon nitride nanosheet through an in-situ method. Compared with the prior art, the photocatalyst disclosed by the invention has the following advantages: (1) compared with O-CN and PDI in the prior art, the photocatalyst disclosed by the invention has more excellent performances of photocatalytically degrading pollutants, killing pathogenic bacteria and photolyzing water to produce oxygen; and (2) the raw materialsare cheap, the process is simple, the product cost is effectively reduced, and the method is suitable for industrial mass production and has very high application prospect and practical value.

The invention discloses a metal coordination porphyrin-based conjugated polymer as well as a preparation method and application thereof in photocatalytic degradation of organic pollutants. The catalyst provided by the invention has an approximately planar macrocyclic molecule with a 18pi conjugated skeleton, a stable rigid structure and a very stable highly conjugated system, so that the catalysthas excellent photoelectric conversion efficiency, a wide absorption spectrum range, strong oxidation-reduction capability and good chemical and thermal stability, metal coordination porphyrin is usedas an active center, a large number of derivatives can be derived, and the method has important application value in the aspects of photocatalytic degradation of environmental pollutants and the like.

The invention provides a silver-silver phosphate-tungsten trioxide ternary composite nano photocatalytic material and a preparation method and application thereof, and belongs to the field of photocatalysis. Ag nanoparticles are loaded on the surface of Ag3PO4, the optical corrosion and decomposition of Ag3PO4 are effectively inhibited by utilizing a plasma resonance effect of the Ag nanoparticles, and thus stability of Ag3PO4 under illumination is guaranteed; introduction of WO3 can effectively inhibit recombination of photo-generated electron hole pairs, and the synergistic effect of Ag, Ag3PO4 and WO3 can effectively improve the photocatalytic performance of the composite material. The ternary composite nano photocatalytic material has the advantages of wide light response range and high quantum efficiency, and can be applied to the field of environmental protection, in particular to photocatalytic degradation of organic pollutants and photocatalytic sterilization.

The invention relates to nitrile substituted quinacridone compounds and application thereof in an organic solar cell. The compounds provided by the invention are quinacridone derivatives using nitrile substituted quinacridone as a basic structural skeleton or quinacridone derivatives using nitrile substituted 2, 9-thiophene quinacridone as a basic structural skeleton. The compounds provided by the invention can be used for preparing an organic solar cell with one or more than one active layer, and at least one layer of the active layers contains one or more than one compound provided by the invention. The active layer can be a light absorbing layer and / or a migrating layer and / or a charge injection layer. The filling factor of the bulk heterojunction solar cell device prepared by using the compounds provided by the invention is higher, and the spectral response range reaches 700nm; and the bulk heterojunction solar cell device is solution-processable, which is beneficial to industrial production.

The invention discloses a preparation method for a stannous methyl amino iodide-titanium dioxide visible light catalytic material. The preparation method comprises the following steps: 1) preparing ammonium methyl iodide; 2) preparing stannous iodide; 3) preparing stannous methyl amino iodide; 4) preparing the stannous methyl amino iodide-titanium dioxide visible light catalytic material: adding stannous methyl amino iodide and tetrabutyl titanate into normal hexane, mixing, heating and stirring at 70 DEG C for reaction under reflux, centrifugally separating turbid liquid by using a high speed centrifuge, adding into deionized water after centrifugal separation, magnetically stirring, filtering, washing and drying to obtain dry solid powder, and putting into a muffle furnace for roasting, thereby acquiring the methyl amino stannous iodide-titanium dioxide visible light catalytic material. The preparation method is simple and convenient in operation and low in cost; the photoproduction electron generated by the visible light catalytic material can quickly transfer to a TiO2 guide tape; the recombination rate of photoproduction electron and hole can be reduced; the separation of the photoproduction electron-hole on the material interface can be promoted; the visible light catalytic activity of the material is promoted.

The invention provides a preparation method of a TiO2 nanometer tube loaded bimetallic catalyst. The method uses a hydrothermal method for preparing a TiO2 nanometer tube; then, a soaking method and achemical reduction method are used for loading the transition metal Cu and the other transition metal M (Ni, Co, Fe, Zn and Cd) (double base metal), so that the loaded metal particles can be sufficiently and uniformly adsorbed onto the surface of the TiO2 nanometer tube and can be uniformly dispersed and sufficiently mixed in the subsequent reduction process and final structure; the activity andthe stability of the particles as catalysts can be enhanced. The base metal loaded TiO2 nanometer tube of a core shell structure is also obtained; the metal load of the core shell structure can accelerate the electron transfer between the metal particles and TiO2; the catalysis activity of the particles as the catalysts can be enhanced.

The embodiment of the invention relates to a fullerene carboxylic derivative modified photocatalyst / super-hydrophobic membrane composite material. The fullerene carboxylic derivative modified photocatalyst / super-hydrophobic membrane composite material comprises a super-hydrophobic membrane, the surface of the super-hydrophobic membrane is covered with a fullerene carboxylic derivative modified photocatalyst, the fullerene carboxylic derivative modified photocatalyst is prepared from at least one of a photocatalyst and a photocatalyst precursor and fullerene carboxylic derivatives. The composite material is novel in structure, excellent in performance and low in electron-hole recombination probability when adopted as the photocatalyst.

The invention discloses a preparation method of halogen bismuth oxide nitrogen fixation photocatalysts with a three-dimensional structure. The preparation method comprises following steps: 1, a glucose aqueous solution is prepared; 2, hydro-thermal reaction, washing, centrifugation, and drying are carried out; 3, an obtained product is added into an acetic acid aqueous solution, and magnetic stirring is carried out; 4, Bi(NO3)3 5H2O is added, after complete dissolving, a halogeno salt of the same molar amount is added so as to obtain a brown precipitate; and 5, drying and sintering are carriedout so as to obtain the halogen bismuth oxide nitrogen fixation photocatalyst with a three-dimensional structure. According to the preparation method, template method is adopted to prepare a plurality of nitrogen fixation photocatalysts, preparation technology is simple, energy consumption is low, different halogeno salts can be adopted to prepare samples of a three-dimensional structure respectively, product purity is high, the morphology is uniform, the dispersibility is excellent, the performance is stable, and the circulation performance is excellent.

The invention discloses a bipyridyl ruthenium complex covalent functionalized graphene photo-catalyst in a structure shown as a formula (I) described in the abstract. In the formula (I), R represents -H, -COOH, -SO3H or -OCH3. Graphene, methyl glycocol and formyl pyridine serve as raw materials, and a graphene base ring addition intermediate compound is synthesized through a 1, 3-dipolar cycloaddition method; the intermediate compound and a bipyridyl ruthenium complex are synthesized through complexing reaction; in order to further improve the photo-catalysis hydrogen evolution activity of the catalyst, a certain amount of platinum nano-particles can be loaded on the bipyridyl ruthenium complex covalent functionalized graphene photo-catalyst as a catalyst promoter. The bipyridyl ruthenium complex covalent functionalized graphene photo-catalyst has the advantages of wide photo-response range, high hydrogen production activity of catalytic water decomposition, high stability, mild catalytic reaction conditions (normal temperature and normal pressure) and the like.

The invention discloses a carbon quantum dot modified bismuth tungstate / ordered macroporous fluorine-doped tin oxide composite photocatalyst, and a preparation method and application thereof, belonging to the technical field of photocatalysis of solar-photoelectrochemical conversion. The composite photocatalyst is prepared by preparing a fluorine-doped tin oxide film with a three-dimensional ordered porous space structure on a conductive substrate, allowing bismuth tungstate to grow on the film to prepare a bismuth tungstate / ordered macroporous fluorine-doped tin oxide composite film, soaking the bismuth tungstate / ordered macroporous fluorine-doped tin oxide composite film in a carbon quantum dot solution and carrying out vacuum drying. The carbon quantum dot-modified bismuth tungstate / ordered macroporous fluorine-doped tin oxide composite film has high specific surface area, high electrical conductivity and high photocatalytic activity, and can be used as a photoanode material for solar-photoelectrochemical conversion equipment. The preparation method of the invention has the advantages of simple process, mild reaction conditions, easy control, and good application prospects.

The invention discloses a titanium dioxide composite material and a preparation method thereof, a photo-anode and an application of the photo-anode. The titanium dioxide composite material comprises a titanium dioxide carrier, cuprous sulfide and cadmium sulfide, wherein the cuprous sulfide and the cadmium sulfide are loaded on the surface of the titanium dioxide carrier. The preparation method comprises loading of the cadmium sulfide and loading of the cuprous sulfide. The preparation method disclosed by the invention has the advantages that the operation process is simple and the loading amount is easy to control; and the prepared titanium dioxide composite material has the advantages of being simple in preparation process, high in photoelectric conversion efficiency, fast in photoresponse, wide in photoresponse degree range, high in corrosion resistance and good in stability, and relatively high photo-generated current can be generated. The photo-anode disclosed by the invention comprises the titanium dioxide composite material, can be used for photoelectric catalysis cracking of water for hydrogen production, and has the advantages of being high in stability, long in service life, high in photoresponse degree, high in photo-generated current, high in photoelectric catalysis cracking capability on water and high in photoelectric conversion efficiency.

The invention relates to a g-C3N4-based composite photocatalytic material, which comprises the following materials of g-C3N4, alpha-Fe2O3 and RGO, wherein the alpha-Fe2O3 is dispersed on the surface of the g-C3N4, and the RGO is inserted between the alpha-Fe2O3 and the g-C3N4; the invention further relates to a preparation method of the g-C3N4-based composite photocatalytic material, which comprises the steps of mixing the g-C3N4 and the alpha-Fe2O3 through stirring, so as to obtain suspension liquid of a g-C3N4 / alpha-Fe2O3 binary compound; the uniformly dispersing GO in the suspension liquid; and finally reducing the GO into RGO, thus obtaining the g-C3N4 / alpha-Fe2O3 / RGO ternary composite photocatalytic material. The g-C3N4-based composite photocatalytic material provided in the technical scheme has the advantages that the photoresponse range is wide, the degradation efficiency on organic dyestuff RhB is high, and the photocatalytic performance is excellent; the preparation method thereof is simple in operation, low in cost, uses less equipment, is green, environment-friendly and pollution-free, and is capable of realizing large-scale production.

The invention discloses a self-assembled tetra (4-carboxyl phenyl) porphyrin / oxygen-doped carbon nitride nanosheet heterojunction photocatalyst as well as a preparation method and application thereof.The photocatalyst is formed by compounding self-assembled tetra (4-carboxyl phenyl) porphyrin (SA-TCPP) and an oxygen-doped carbon nitride nanosheet (O-CN) through electrostatic interaction and pi-piinteraction, the mass ratio of the O-CN to the SA-TCPP ranges from 1: 0.001 to 0.8; the SA-TCPP is modified on the O-CN through an in-situ method. Compared with the prior art, the photocatalyst disclosed by the invention has the following advantages that (1) compared with O-CN and SA-TCPP in the prior art, the photocatalyst disclosed by the invention has more excellent performances of photocatalytically degrading pollutants and photolyzing water to produce oxygen; and (2) the method disclosed by the invention is green, safe, simple in process, low in cost and suitable for industrial mass production, and has relatively high application prospect and practical value.

The invention relates to the technical field of photocatalytic coatings, particularly to a composite titanium dioxide photocatalytic active coating and a preparation method thereof. The preparation method comprises the following three steps: (1) preparing composite modified Ti02 powder; (2) preparing a composite Ti02 photocatalytic active emulsion; and (3) preparing an active coating. According tothe present invention, the prepared photocatalytic active coating has characteristics of high photocatalytic efficiency and wide photoresponse range, and can effectively solve the problems of difficult recovery, low photocatalytic efficiency, easy agglomeration and easy secondary pollution generation during photocatalytic reaction, and the like of the Ti02 powder catalyst; and the prepared titanium dioxide photocatalytic active coating can be reused so as to reduce the catalyst consumption, and further has broad market application prospects.

The invention relates to the field of synthesis of organic-inorganic hybrid chromogenic materials, in particular to a photochromic / thermochromic material based on a methyl nicotinic hydrazide-iodine cuprate hybrid and preparation of the photochromic / thermochromic material. An in-situ generated methyl nicotinic hydrazide cation is taken as a structure-directing agent for guiding synthesis of the iodine cuprate hybrid with photochromic and thermochromic properties. According to the invention, the methyl nicotinic hydrazide cation and an iodine cuprate anionic framework are taken an electron acceptor and donor respectively, one photochromic / thermochromic difunctional material based on the methyl nicotinic hydrazide-iodine cuprate hybrid is provided, so that variety and color of a conventional chromogenic material are enriched, and the blank in the technical field is filled up. The photochromic / thermochromic material can respond to ultraviolet light and visible light besides response to low temperature to produce reversible thermochromism, photochromism and achromatism speeds are high, the photoresponse range is wide, the chromogenic contrast is high, the chromogenic performance of the conventional material is greatly improved, and the application range of the chromogenic material is broadened.

The invention discloses a P-N heterojunction composite material loaded on the surface of foamed nickel and a preparation method and application thereof. The P-N heterojunction composite material is asupported catalyst which can be used for removing pollutants in a water body through photoelectrocatalysis. The preparation method comprises the following steps: firstly, modifying a layered nickel-iron bimetal hydroxide nanosheet on the surface of foamed nickel with a clean surface through a hydrothermal method; and then modifying the surface of the layered nickel-iron bimetal hydroxide nanosheetwith cobaltosic oxide nanowires in a mixed solvothermal mode to obtain the P-N heterojunction catalyst composite material (Ni < foam > Ni < Fe-LDH / Co3O4) loaded on the surface of the foamed nickel. The composite material has good response to visible light, the light absorption and utilization rate of the material can be greatly enhanced and the performance of the catalyst can be enhanced.

The invention relates a controllable synthesis method of nonmetallic ion-doped nano titanium dioxide by a phase separation-hydrolysis solvothermal method, in particular to a synthesis method of nonmetallic ion-doped nano titanium dioxide, which solves the problems of low doping efficiency, complicated process, high cost and poor universality of the existing nonmetallic ion doping method of the nano titanium dioxide. The synthesis method comprises the following steps: 1, mixing tetrabutyl titanate with methylbenzene and then stirring to obtain an organic phase; 2, adding nonmetallic ion aqueous solution to a high-pressure reaction kettle, placing the organic phase into a U-shaped groove, placing the groove into the nonmetallic ion aqueous solution, covering, carrying out solvothermal treatment, cooling and filtering; and 3, drying by oil bath and then roasting to obtain the nonmetallic ion-doped nano titanium dioxide. The synthesis method of the invention has simple process, high doping efficiency, low cost and wide applicability; and the obtained nano titanium dioxide has high crystallization degree and good visible light catalytic activity, thus the nano titanium dioxide can be applied to visible light catalytic degradation of organic pollutants.

The invention belongs to the technical field of mineral composite materials, and relates to a preparation method and an application of an attapulgite composite material with a plasmon resonance effect. The preparation method comprises the following steps: (1) taking and acidifying purified attapulgite clay to obtain modified attapulgite; (2) adding tungsten hexachloride and the modified attapulgite to the anhydrous ethanol, and performing ultrasonic mixing; and (3) placing and reacting the obtained mixed solution in a microwave hydrothermal chemical reactor, centrifuging the obtained solution,and washing and drying the obtained reaction product to obtain the tungsten oxide (W18O49) / attapulgite composite photocatalytic material. The plasma type tungsten oxide / modified attapulgite nanocomposite material is synthesized by a microwave solvothermal process, and the prepared catalyst can maximally convert N2 into NH3 under the irradiation of visible light, and has an excellent photocatalytic ability.

The invention discloses a recyclable flexible titanium dioxide / pyrolytic carbon / carbon fiber felt composite photocatalytic material as well as a preparation method and application thereof, and relates to the field of photocatalytic materials. The preparation method comprises the steps: soaking a carbon fiber felt in acetone, and drying to obtain a clean carbon fiber felt; heating the clean carbon fiber felt in an inert atmosphere, and depositing pyrolytic carbon at a high temperature in a methane atmosphere to obtain a pyrolytic carbon / carbon fiber felt; and evenly mixing acetone, ethylene glycol and tetrabutyl titanate to obtain a mixed solution, mixing the obtained pyrolytic carbon / carbon fiber felt and the obtained mixed solution for a hydrothermal reaction, cleaning and drying an obtained product after the reaction is finished, and preparing the recoverable flexible titanium dioxide / pyrolytic carbon / carbon fiber felt composite photocatalytic material. The problems that in the prior art, a TiO2-based traditional powder photocatalyst is low in solar energy utilization rate and not easy to recycle are effectively solved.

The invention relates to the field of optical catalysis, and further relates to a SnO2 modified fullerene composite material of a micro nano structure and a preparation method and an application thereof. The composite material comprises fullerene of the micro nano structure and SnO2, wherein the micro nano structure serves as a main body and SnO2 is loaded to the surface of fullerene of the micronano structure. The preparation method comprises the following steps: dispersing fullerene of the micro nano structure in water to obtain a dispersion liquid; and adding a SnO2 precursor, a compelxingagent and a reducer into the dispersion liquid to react under conditions of heating, stirring and refluxing, and cooling the solution and separating the solid to obtain the composite material. The embodiment of the invention also provides the application of the composite material in photocatalytic degradation of organic pollutants. The composite material is novel in structure and excellent in performance. When the composite material is used as a photo catalyst, the energy band structures of SnO2 and fullerene of the micro nano structure are high in matching degree, low in electron-cavity recombination rate, good in quantum efficiency, high in optical utilization ratio and good in photo catalytic activity.

The invention discloses a high-efficiency white-light catalyzed indoor air purifying agent and a preparation method of the high-efficiency white-light catalyzed indoor air purifying agent. A white-light catalyst refers to composite titanium dioxide nanoparticles which are doped with metals and nonmetals of which the surfaces are hydrogenated. The preparation method of the composite titanium dioxide nanoparticles is two-step synthesis of a hydrothermal method and a surface hydrogenation method. According to the invention, two modified methods of ion doping and surface hydrogenation are combined, and play a synergistic effect to regulate the band gap of titanium dioxide, so that an ultraviolet region and a visible region of the light catalyst both have stronger photocatalytic activities, and obvious purifying effects for indoor air under the irradiation of a fluorescent lamp. The air purifying agent prepared by the invention has the characteristics of low cost, strong process controllability, easy industrial production and the like.

The invention discloses a surface plasma nano-photocatalytic material as well as a preparation method and application thereof. The surface plasma nano-photocatalytic material contains the following components in percentage by weight: 62%-94% of Ag3PO4 and 6%-38% of AgCl. The preparation method comprises the following steps: firstly adequately dissolving NaH2PO4 into deionized water, dropwise adding an AgNO3 solution in a mechanism stirring state, continuing to stir so as to obtain a photocatalyst Ag3PO4, and washing with deionized water; then dropwise adding an NaCl solution; and carrying out centrifugal separation on an obtained solution, washing with deionized water, and drying, so as to obtain the photocatalytic material Ag3PO4 / AgCl. By virtue of a plasma resonance effect of AgCl, the photocorrosion and decomposing of Ag3PO4 are effectively inhibited, and the stability and photocatalytic activity of Ag3PO4 under the illumination are improved. The preparation method is simple and relatively low in cost, and organic pollutants can be degraded through photocatalysis of visible light.

The invention discloses a calcium tungsten manganese / mesoporous tungsten trioxide composite that can be used to prepare a photoanode and a preparation method thereof. The calcium tungsten manganese / mesoporous tungsten trioxide composite includes mesoporous tungsten trioxide and calcium manganese. Oxide. Mesoporous tungsten trioxide has a short electron migration distance, and island-shaped tungsten manganese calcium oxide serves as an oxygen-generating active center site and has a low oxygen evolution potential. Therefore, the photoanode made of this composite has a high light intensity. Catalytic oxygen production activity. Compared with the corresponding single-component catalyst, this ternary composite semiconductor catalyst overcomes the shortcomings of a single catalyst through the combination of calcium manganese and tungsten oxide, and has high charge separation efficiency, small oxygen evolution overpotential, and good catalytic activity and stability. With other advantages, it is a promising new catalytic material for preparing photoanode of photochemical cells.

The invention discloses a tungsten manganese calcium / mesoporous tungsten trioxide compound for preparing a photo-anode and a preparation method thereof. The tungsten manganese calcium / mesoporous tungsten trioxide compound is prepared from mesoporous tungsten trioxide and manganese calcium oxide. The mesoporous tungsten trioxide has a shorter electron migration distance, and the island-shaped tungsten manganese calcium oxide is used as an oxygen generation active center sites and has a lower oxygen evolution potential, so that the photo-anode prepared through the compound has higher photocatalysis oxygen generation activity. Compared with a corresponding single-component catalyst, according to a ternary compound semiconductor catalyst, the defects of a single catalyst are overcome through the compounding of manganese calcium and tungsten oxide, and the ternary compound semiconductor catalyst has the advantages of high charge separation efficiency, low oxygen evolution overpotential, good catalytic activity and stability, and the like, and is a promising novel catalytic material for preparing the photo-anode of a photochemical cell.

The embodiment of the invention relates to application of a semiconductor composite material loaded with fullerene and a derivative thereof in photocatalytic degradation of indoor VOCs. According to the invention, the fullerene comprises at least one selected from the group consisting of hollow fullerene and metal fullerene; the fullerene derivative comprises at least one selected from the group consisting of a fullerene aminated derivative, a fullerene carboxylated derivative and a fullerene hydroxylated derivative; a semiconductor body in the composite material comprises at least one selected from the group consisting of titanium dioxide, zinc oxide, tin oxide and manganese oxide. According to the composite material, the utilization efficiency of solar energy is high in the process of removing indoor VOCs through photocatalysis; meanwhile, no harmful product O3 is generated in the reaction process, indoor VOCs pollution with large quantity and high concentration can be treated, and the composite material is stable in structure, capable of being repeatedly used, excellent in indoor VOCs pollutant degradation performance and low in cost.

The invention belongs to the technical field of photoelectric detectors, and particularly relates to a quantum dot photoelectric detector. The quantum dot photoelectric detector comprises an N-type semiconductor layer, a P-type semiconductor layer and a quantum dot layer, the N-type semiconductor layer and the P-type semiconductor layer are oppositely arranged, the quantum dot layer is arranged between the N-type semiconductor layer and the P-type semiconductor layer, and the P-type semiconductor layer comprises composite metal oxide. The molecular formula of the composite metal oxide is An-1BnO3n-3, wherein A is selected from any one of metal elements, B is selected from any one of transition metal elements, and n is greater than or equal to 3; and the N-type semiconductor layer comprises a perovskite material. The photoelectric detector comprises a P / N structure quantum dot photoelectric detector of the perovskite material, the quantum dots and the composite metal oxide, the photoresponse range is wide, optical signals with the wavelength of 200-800 nm can be detected, the sensitivity is high, detection of the optical signals can be achieved without external electric field driving, and application is convenient and flexible.

The invention provides a doping-modified TiO2 photocatalytic thin film, and a preparation method and an application thereof, wherein the preparation method includes: performing composite doping modification on TiO2 thin film by using ferrous ion and iodate ion, thus effectively improving the photocatalytic absorption wavelength of the TiO2 photocatalytic thin film to 375-395 nm. The thin film is wide in photo-responding range and can employ a light-emitting diode as a photo-catalytic light source. The photocatalytic activity of the doping-modified TiO2 photocatalytic thin film is high, so thatthe thin film can be widely applied to edible oil processing field and can effectively photo-catalytically degrade aflatoxin in edible oil, and has very great application prospect.