552 results about "Charge separation" patented technology

The invention discloses a preparation method of a high-performance magnesium-lithium separation membrane. The preparation method comprises the following steps: forming a polyamide film; mixing small molecular quaternary ammonium salt and amine monomer to serve as a solution for secondary interfacial polymerization; performing secondary interfacial polymerization to form a positive charge separation layer; and finally, promoting the reaction through high-temperature curing to obtain the nanofiltration membrane. According to the invention, the quaternary ammonium group with strong positive charges is introduced into the membrane in an in-situ grafting manner, the positive electricity of the membrane is increased, meanwhile, a transmission pore channel with positive charges is constructed, the operation is simple, the effect is obvious, the separation capacity of the membrane is greatly improved, and the method has a wide large-scale application prospect.

The present invention discloses a CMO / SO / BVO photoanode and a preparation method and application thereof, and relates to the field of photoelectrochemical technology. The method comprises the following steps in sequence: electrodepositing a BiOI film on a substrate material, and then dripping a dimethyl sulfoxide solution containing vanadium acetylacetonate to obtain a BVO electrode; placing in a NaOH solution containing tetraethyl orthosilicate to obtain a SO / BVO electrode; placing in a CoMoO4 precursor solution, hydrothermally reacting, calcining, and obtaining a CMO / SO / BVO photoanode. The CMO / SO / BVO of the present invention exhibits superior photocurrent and charge separation efficiency compared to the CMO / BVO photoanode under 1.23V vs.RHE conditions. The present invention solves the problem of poor photoelectrochemical performance of the photoanode in the prior art.

The invention discloses a novel photocatalyst for producing hydrogen from organic matter wastewater and a preparation method of the novel photocatalyst, and relates to the technical field of photocatalysis. The photocatalyst disclosed by the invention is combined with oxidation-reduction capability, and can effectively degrade and produce hydrogen under the irradiation of sunlight. Through combination of quaternized porous tungsten oxide and vanadate radicals, silver vanadate load growth is promoted, the sunlight utilization rate is increased, and the electron-hole recombination rate is reduced. Reduced graphene oxide is used for pretreatment, active groups are introduced, the reduced graphene oxide is compounded with tungsten oxide / silver vanadate, the binding force is enhanced through heat treatment, photo-induced electron-hole pair compounding is inhibited through the conductivity, and the visible light catalytic performance is improved. The adsorption effect of porous tungsten trioxide and reduced graphene oxide can accelerate the degradation of organic matters. By optimizing the proportion of silver vanadate, tungsten oxide and reduced graphene oxide, the visible light response and charge separation efficiency are enhanced, the degradation and hydrogen production performance is improved, and light corrosion is reduced.

The invention belongs to the field of photocatalysts, and discloses a MoS2 / CdS composite photocatalyst, which is a composite material prepared by taking cadmium acetate as a cadmium source, thioacetamide as a sulfur source and ethylenediamine as a reaction solvent, synthesizing a CdS nanorod through a one-step hydrothermal method, and growing a MoS2 promoter at one end of the CdS nanorod. The invention also discloses an application of the MoS2 / CdS composite photocatalyst in hydrogen production by decomposing water molecules under an illumination condition. The MoS2 cocatalyst with an electron harvesting agent function is grown at one end of the CdS nanorod, so that the performance is improved, and the use of noble metals is avoided. The MoS2 / CdS composite photocatalyst disclosed by the invention has excellent catalytic activity and stable hydrogen evolution activity under a simulated sunlight condition.

The invention relates to the technical field of composite catalyst materials, in particular to a ferrocobalt bimetal hydroxide / BCN composite material and a preparation method and application thereof.The preparation method comprises the steps that cobalt nitrate and ferric nitrate are used for preparing a metal salt solution, sodium carbonate and sodium hydroxide are used for preparing a precipitant solution, a B-doped carbon nitride BCN material is added into the metal salt solution to form a uniform suspension, and the suspension is dried to obtain the ferrocobalt bimetal hydroxide / BCN composite material; dropwise adding the precipitant solution into the suspension to obtain a precursor solution, performing hydrothermal reaction on the precursor solution, and performing centrifugal impurity removal and drying to construct a heterostructure between layered double hydroxide and BCN in situ to obtain the Co-Fe LDH-coated BCN composite material. Through boron doping and heterostructure construction, the charge separation capacity of graphite carbon nitride is enhanced, the electron migration efficiency is improved through a heterointerface structure, the metal ion release amount and the cycle stability are controlled, and the catalytic performance is remarkably improved.

The invention relates to the technical field of environmental chemistry and photoelectrocatalysis, in particular to a TiO2 / polyaniline organic-inorganic hybrid composite photoanode which is characterized in that a stainless steel sheet serves as a substrate of the composite photoanode, a TiO2 / polyaniline composite film layer serves as a surface layer of the composite photoanode, and TiO2 / polyaniline in the composite layer of the photoanode is combined with the stainless steel substrate through the action of a coalescing agent. The surface of the composite photoanode is smooth and flat, and the TiO2 / polyaniline composite photoanode is low in cost, small in chemical reagent danger, small in environmental harm and capable of enhancing visible light absorption, improving the absorption capacity of the composite anode in a visible light area and fully improving the utilization efficiency of solar energy. And moreover, the interfacial interaction between TiO2 and polyaniline can be beneficial to promoting charge separation, providing a more effective charge transmission channel and reducing charge recombination loss, so that the photoelectric conversion efficiency is improved.

The invention provides a Cu2O-based heterogeneous composite material as well as a preparation method and application thereof. The preparation method comprises the following steps: coating the surface of a Cu2O hollow sphere substrate with a carbon layer, and depositing layered double hydroxides (LDHs) and metal palladium (Pd) nanoparticles on the carbon layer. According to the material, through a Cu2O-carbon layer-LDHs-Pd multistage heterostructure design, space optimization of light absorption, charge transfer and catalytic sites is realized; cu2O-carbon layer-LDHs interface coupling promotes directed migration of photo-induced electron-hole pairs, and the surface plasmon resonance effect of Pd nanoparticles enhances the charge separation efficiency; the LDHs optimizes a charge transfer path through surface oxygen vacancy or metal valence cycle, so that synergistic oxidation of non-free radicals and free radicals is realized, the organic matter degradation efficiency is remarkably improved, the oxidation path is widened, and the performance bottleneck of a single material is broken through.

The invention belongs to the technical field of immunoassay and biosensing, and provides a novel construction mode of a heterojunction dual-photoelectrode photoelectric sensing strategy and a preparation method of an in-situ heterojunction MIO photocathode. The invention relates to a preparation method of a heterojunction dual-photoelectrode type photoelectrochemical sensor based on multi-ball cascade DNA reaction amplification. Specifically, the design is composed of an In2O3 / CdS photoanode and an in-situ formed MIL-68 / In2O3 (MIO) photocathode. The heterojunction dual-photoelectrode sensing strategy effectively prolongs an electron-hole transmission path, enhances photo-generated charge separation, and realizes' super-open 'PEC signal output, thereby providing a steady baseline for signal conversion. Meanwhile, a multi-sphere cascade DNA reaction is combined to output a three-dimensional DNA net structure to provide a large number of sites for embedding of a PEC quenching probe doxorubicin-ferrocene carboxylic acid (DOX-FcCOOH), obvious PEC signal quenching is realized by utilizing the efficient competitive electron transfer capability of the three-dimensional DNA net structure, and finally, a signal conversion system with'opening-super opening-closing 'multistage response characteristics is constructed. The detection of the nucleic acid marker Pax-5a gene of the B cell acute lymphatic leukemia is realized by detecting target objects with different concentrations.

The invention is suitable for the technical field of photocatalyst preparation, and provides a modified tubular g-C3N4 loaded Ni-CoP photocatalyst and a preparation method thereof. The preparation method comprises the following steps: calcining a carbon nitride precursor in stages to obtain tubular carbon nitride, stirring the tubular carbon nitride with a cobalt and nickel-containing compound and an alkaline compound, washing and drying to obtain a precipitate, calcining, mixing and grinding with a phosphorus-containing compound, calcining again, and modifying the product with polydopamine and polypyrrole to obtain the composite material. The photocatalyst modified by the polydopamine and the polypyrrole and loaded with the Ni-CoP by taking the tubular g-C3N4 as the carrier is obtained. According to the invention, three-in-one synergistic integration of'carrier-modifier-cocatalyst 'is realized, the prepared photocatalyst still keeps tubular morphology and has a larger specific surface area, the requirements of anode oxygen evolution reaction (OER) on rapid charge separation and transmission can be met, meanwhile, the light absorption range is widened, the solar energy utilization rate is increased, and a foundation is laid for efficient OER reaction.

To improve the performance of a mass spectrometer.SOLUTION: An ion trap type mass spectrometer that ionizes a sample adhering to a test object and separates ions on the basis of the mass and charge, comprises: a heating unit 1 which heats and vaporizes a sample; a sample introduction tube 10 which introduces the sample vaporized by the heating unit 1 to an ion source 15; the ion source 15 which applies a charge to the sample; a container 210 whose inside is in the vacuum state; a first pore 51 which introduces the sample ionized by the ion source 15 to the container 210; an ion trap unit 300 which is provided in the container 210; and a second pore 71, an intermediate lens 90 and an adjustment lens 110 which are sequentially provided between the first pore 51 and the ion trap unit 300 and transports the ions being the sample introduced to the container 210 to the ion trap unit 300. In the adjustment lens 110, the amount of ions passing through the adjustment lens 110 is controlled by a control unit connected to the mass spectrometer.SELECTED DRAWING: Figure 1

The invention relates to an external field intelligent regulation and control photocatalytic hydrogen production integrated device and system. The device comprises a Fresnel lens; the double-layer vacuum glass tube comprises an outer-layer glass tube, an inner-layer glass tube and a vacuum layer located between the outer-layer glass tube and the inner-layer glass tube, and the inner-layer glass tube is connected with an external water source and the separation module; the Helmholtz coil comprises two conductor coils, and the two conductor coils are symmetrically arranged at the two ends of the outer-layer glass tube in a sleeving mode and are communicated with an external power source; the photocatalyst is arranged in the inner-layer glass tube and is positioned at a strip-shaped light band of the sunlight focused by the Fresnel lens; the separation module comprises a hydrogen separation membrane and a gas outlet and is used for efficiently separating gas generated by reaction; the Fresnel lens is connected with the double-layer vacuum glass tube through the fixing support and located on the upper side of the double-layer vacuum glass tube. The Helmholtz coil is used for generating a magnetic field to improve the photo-generated charge separation efficiency in the photocatalytic reaction process, so that the hydrogen production efficiency is improved. The efficiency of photocatalytic reaction hydrogen production can be improved through precise regulation and control of an external field.

The invention discloses a hole transport material, a preparation method thereof and a perovskite solar cell, and belongs to the technical field of photovoltaic solar materials. The molecular structural formula of the compound is shown as a formula (I) or a formula (II). According to the invention, a quinoxaline part is used as an electron acceptor for extended conjugate modification, a plurality of single donors such as triphenylamine electron donating groups, dihydroacenaphthene, binaphthyloxy and the like are introduced, the hole transport material with a multi-donor structure is constructed, and the hole transport material adjusts the distribution of HOMO-LUMO, increases charge transfer channels, improves the separation and transport capabilities of charges, and improves the hole transport efficiency. Therefore, the mobility of current carriers is improved. A tert-butyl unit is further introduced to the periphery of the triphenylamine group, the hydrophobic property of tert-butyl reduces the interface energy barrier between the hole transport layer and the perovskite precursor solution, directional growth and defect passivation of perovskite crystals are promoted, and the crystallization quality of the perovskite thin film and the device performance are improved.

The invention discloses a barium ion single-doped / double-doped brookite titanium dioxide nanorod catalyst as well as preparation and application, the catalyst synthesized by a thermal decomposition method comprises brookite phase titanium dioxide and doped barium ions, and the nanorod-shaped catalyst containing oxygen vacancy defects has the width of 4-6 nanometers and the length of 20-50 nanometers. The piezoelectric property of brookite titanium dioxide is induced through doping of barium ions, charge separation is promoted through a built-in electric field, meanwhile, oxygen vacancies are induced through a charge compensation mechanism, the piezoelectric catalysis and photocatalytic efficiency is promoted, and the problems mentioned in the background technology are solved.

The invention discloses a current collector composite copper foil film spreading method and device, and the method comprises the steps: applying a DC electric field to a current collector composite copper foil, forming an interface charge separation layer, obtaining reference capacitance distribution data, applying a film spreading tension to enable the material layers to generate microscopic displacement, and obtaining capacitance change data. The method comprises the following steps: analyzing and identifying an abnormal adhesion area through time domain difference and sliding window correlation, applying periodic micro-stress disturbance to the abnormal area to establish a stress-capacitance response relation to invert adhesion strength spatial distribution, and periodically recording a capacitance reference value to evaluate the interface adhesion fatigue degree. The device comprises an electric field processing module, a film spreading tension module, a correlation analysis module, a stress disturbance module and a fatigue evaluation module. According to the scheme, real-time dynamic detection and quantitative evaluation of the interlayer adhesion strength in the current collector composite copper foil film spreading process can be realized, the interface adhesion failure and fatigue accumulation state can be effectively identified, and accurate technical support is provided for battery current collector preparation process optimization and product quality control.

The invention relates to the technical field of electroluminescence, and discloses a laminated organic light-emitting device and application thereof, and the laminated organic light-emitting device comprises an anode layer, a first light-emitting unit, an electron transport layer, an interface modification layer, a connection layer, a second light-emitting unit and a cathode layer which are sequentially arranged from bottom to top; the electron transport layer comprises a hole blocking layer and an n-type electron transport layer; wherein the n-type electron transport layer is composed of an n-type dopant and an organic electron transport material, has the functions of electron transport, charge separation and injection and regulation and control of the optical microcavity effect of the laminated device, can simplify the electron transport and connection layer structure of the laminated device, and effectively improves the conductivity of the laminated device; according to the laminated organic light-emitting device, the voltage drop of the body is obviously reduced, and the interface electron injection barrier is reduced, so that the laminated organic light-emitting device has the advantages of low driving voltage, high efficiency and long service life, and the effect of adjusting the optical microcavity of the device can be achieved by utilizing the n-type electron transport layer.

The invention provides a double-defect-modified porous carbon nitride photocatalyst prepared by one step from ferromolybdic acid as well as a preparation method and application of the double-defect-modified porous carbon nitride photocatalyst. The catalyst is of a thin-layer porous structure, so that the specific surface area of the catalyst is increased, and more surface active sites are provided for adsorption and reaction; compared with pure g-C3N4, the visible light absorption intensity of the catalyst is obviously enhanced, due to the existence of surface N vacancies and defects formed by doping of metal oxides, effective charge separation is enhanced, the photon-generated carrier separation and transfer capacity is higher under visible light irradiation, and the catalytic activity is remarkably improved. When the photocatalyst is applied to degradation of tetracycline antibiotic pollutants, photocatalytic degradation of tetracycline can be realized only under the condition of low-power 5W LED visible light, the preparation process is simple, and the cost is lower.

The invention discloses a porous organic polymer material, a preparation method of the porous organic polymer material and application of the porous organic polymer material in CO2 adsorption and photocatalytic preparation of H2O2, and belongs to the technical field of organic framework materials. The porous organic polymer material is prepared by the following method: adding a compound A and benzo [1, 2-B: 3, 4-B ': 5, 6-B'] trithiophene-2, 5, 8-trialdehyde into a solvent, and uniformly mixing; then adding a catalyst, and carrying out polymerization reaction under the condition of inert gas to obtain a polymerization reaction product; and washing and drying the reaction product to obtain the porous organic polymer material. The porous organic polymer material prepared by the invention is novel in structure, not only has excellent photoinduced charge separation and transmission efficiency, shows better advantages in the aspect of photocatalytic preparation of H2O2, but also has excellent CO2 adsorption performance, thereby having important value and significance for further expansion and application of organic framework materials.

Methods include introducing an ion quantity into an ion accumulation region, wherein the ion accumulation region, which can comprise a structure for lossless ion manipulations (SLIM) device allowing creation of a static or traveling wave electric field that moves ions towards an ion wall controllably blocking a movement of the ion quantity past the ion wall, wherein the ion wall is produced by one or more ion wall electrodes of an electrode arrangement, and directing the ion quantity in a direction towards the ion wall to increase a density of the ion quantity adjacent to the ion wall, such that the quantity of ions becomes space charge separated based on mobility along the direction and adjacent to the ion wall. Related apparatus provide space charge driven mobility separations.

The invention relates to the field of covalent organic framework materials and photocatalytic organic reactions, in particular to a COF material for improving photo-generated charge separation and a preparation method and application of the COF material. According to the present invention, 1, 3, 5-tri (4-aminophenyl) benzene (TAPB) is adopted as a donor unit, and a novel D-A type multi-bibenzothiadiazole TPAB-DTT-COF covalent organic framework material using a conjugated unit 2, 1, 3-benzothiadiazole as an acceptor unit is prepared; tAPB is an excellent electron donor unit which is widely used at present, polybiphenyl thiadiazolyl is an electron withdrawing group, the combination and matching of TAPB and polybiphenyl thiadiazolyl enhance the electronegativity difference value in molecules, reduce the exciton binding energy, promote the transfer of electrons from TAPB to a DTT unit, enhance the in-plane transmission and exciton separation efficiency, dissociate excitons under illumination, and improve the efficiency of electron transfer. The TAPB-DTT-COF material has the advantages that the TAPB-DTT-COF material has obvious photocurrent response signal, more obvious charge transfer performance and good photocatalytic performance;

The invention discloses a preparation method and application of a nickel-titanium composite catalyst, and the preparation method of the nickel-titanium composite catalyst comprises the following steps: (1) roasting TiO2 in the presence of a reducing gas to obtain an intermediate; and (2) mixing and heating the intermediate obtained in the step (1) and a Ni precursor solution, and roasting in the presence of reducing gas to prepare the nickel-titanium composite catalyst. The preparation method of the catalyst provided by the invention has the advantages of easily available raw materials, simple process and easiness in industrialization. By changing the particle size of the TiO2 carrier, the interaction between metal Ni / TiO2 can be effectively adjusted, then the Ni / TiO2 photo-generated charge separation efficiency is adjusted, and finally the selectivity of a carbon dioxide hydrogenation reaction product is adjusted. The catalyst provided by the invention can realize photothermal conversion without an external heating device, and the nickel-titanium composite catalyst can realize strong light absorption under a full spectrum.

The invention relates to preparation of a crystalline allyl covalent organic framework material and application research of the crystalline allyl covalent organic framework material in benzamide cyclization green photocatalytic conversion. The SF-COF material is prepared by adopting a step-by-step synthesis method. The preparation method comprises the following steps: synthesizing a COF precursor by taking 1, 3-benzenetricarboxaldehyde and p-aminophenylacetonitrile as raw materials, and preparing the allylation covalent organic framework material with the electronic push-pull effect from the COF precursor and 5, 5 ', 5'-(benzene-1, 3, 5-triyl) tri (thiophene-2-formaldehyde) through a solvothermal method. The material is applied to the field of photocatalytic organic conversion, and benzamide cyclization and conversion of derivatives of benzamide are achieved under irradiation of a blue light LED. The prepared SF-COF has the advantages of efficient charge separation and electron conduction performance, good structural stability and chemical stability and the like. And a catalyzed organic reaction substrate has the advantages of wide universality range, good cycle stability and the like, and shows excellent photocatalytic conversion capability.

The application discloses a preparation method and application of a ferroelectric full water-splitting photocatalyst. The preparation method comprises the following steps: S1: pretreating a ferroelectric material to obtain a pretreated ferroelectric material; S2: after atomic layer deposition of the pretreated ferroelectric material and a metal organic complex source material, non-active gas I is introduced to perform blowing I, water is introduced, non-active gas II is introduced again to perform blowing II, and the first deposition is completed; and S3: according to the thickness of the ferroelectric full water-splitting photocatalyst, the step S2 is circularly performed to obtain the ferroelectric full water-splitting photocatalyst. The ferroelectric material can efficiently photocatalyze full water splitting through accurate regulation and modification of the surface of the ferroelectric material by the atomic layer deposition technology. The method not only provides an experimental basis for researching the limiting factors of the ferroelectric material in a photocatalytic reaction, but also provides a new idea for constructing an efficient photocatalyst by using efficient charge separation and depolarization electric field of the ferroelectric material.

The invention discloses a nitride Ta3N5 and a preparation method and application thereof.The specific method comprises the steps that a precursor I is subjected to pyrohydrolysis, TaOx with the small size is prepared, the nitride Ta3N5 can be prepared after short-time nitridation by means of the characteristics that TaOx is amorphous and small in particle radius, generation of low-valence metal defects is effectively reduced, the charge separation efficiency is improved, and the method is suitable for industrial production. The Ta3N5 shows water decomposition activity in a photocatalytic water decomposition reaction, and the activity of the Ta3N5 is obviously improved compared with that of Ta3N5 prepared by a conventional method.

The present disclosure relates to the technical field of display, and provides a light-emitting device and a display panel. The light-emitting device comprises a first electrode, a second electrode, a plurality of light-emitting units arranged between the first electrode and the second electrode, and a charge separating generating unit arranged between adjacent light-emitting units, wherein a light-emitting center of the light-emitting unit is located at an antinode point of a resonance wave of a resonant microcavity formed between the first electrode and the second electrode.

The invention relates to a high-performance positively charged composite membrane and a preparation method thereof, in particular to a nanofiltration membrane containing a sulfonated imino covalent organic framework (TpPa-SO3H) interlayer. The nanofiltration membrane adopts a three-layer structure design, and comprises a base membrane layer, a TpPa-SO3H middle interlayer and a positively charged separation surface layer. Wherein the TpPa-SO3H interlayer is formed by in-situ growth of polyphenol and sulfated amine under the action of an oxidizing agent, and the separation surface layer is assembled and constructed through electrostatic attraction and hydrogen-bond interaction between positively charged polyelectrolyte and sulfonic acid groups. The TpPa-SO3H interlayer is introduced to effectively regulate and control the pore size distribution and hydrophilicity of the surface of the substrate, the formed negative electricity interlayer can promote the assembly of a polyelectrolyte positive electricity layer, and the interception performance and the operation stability of the composite membrane on heavy metal cations are remarkably improved. Compared with a traditional nanofiltration membrane, the composite membrane prepared through the method keeps high water flux (larger than or equal to 40 L.m <-2 >. H <-1 >. Bar <-1 >), meanwhile, the rejection rate of heavy metal cations such as Cr < 3 + >, Mn < 2 + > and Co < 2 + > is larger than or equal to 95%, and the composite membrane has excellent long-term operation stability. The preparation method is simple in process and low in cost, and has a wide application prospect in the field of heavy metal wastewater treatment.

The invention discloses a preparation method and application of a TiO2 / Ag-coated MoS2 composite photocatalyst, and relates to the technical field of catalysts.The method comprises the steps that titanium dioxide is evenly dispersed in an ethanol-water mixed solution to form turbid liquid; adding a silver nitrate solution and carrying out ultraviolet irradiation to carry out a photodeposition process; adding an ammonium tetrathiomolybdate precursor solution into the turbid liquid, carrying out ultraviolet irradiation, inducing MoS < 2-> to be subjected to an auto-oxidation reduction reaction through an electronic effect, generating an amorphous MoS2 shell on the surface of silver, and forming a core-shell Ag-coated MoS2 cocatalyst; and centrifuging, washing and drying to obtain the TiO2 / Ag-coated MoS2 composite photocatalyst. According to the Ag-coated MoS2 cocatalyst, the electron density of S atoms is higher, the strength of S (2 + delta)-Had bonds is weakened, and Had is more easily desorbed to form hydrogen; and the photocatalyst also has better light absorption and photo-generated charge separation efficiency, so that the photocatalyst shows better photocatalytic hydrogen evolution activity and stability.

The invention relates to a co-doped carbon nitride / phosphomolybdic acid composite catalyst as well as a preparation method and application thereof. The composite catalyst is composed of co-doped carbon nitride and phosphomolybdic acid loaded on the co-doped carbon nitride; the co-doped carbon nitride is graphite phase carbon nitride co-doped with sodium, phosphorus and oxygen, and the co-doped carbon nitride is prepared by mixing a cyanamide compound and sodium hexametaphosphate and calcining at high temperature. The composite catalyst is used for photocatalytic production of hydrogen peroxide, and a method for photocatalytic production of hydrogen peroxide comprises the following steps: dispersing the co-doped carbon nitride / phosphomolybdic acid composite catalyst in an aqueous solution containing a sacrificial agent, and performing photocatalytic preparation of hydrogen peroxide under irradiation of a xenon lamp. Compared with the prior art, the preparation method provided by the invention is simple and good in repeatability, the charge separation efficiency of the prepared photocatalytic material is remarkably improved, and the photocatalytic hydrogen peroxide preparation efficiency is high.

The invention discloses an application of a charge transfer coated semiconductor material in a gas sensitive sensing device, and belongs to the technical field of semiconductor sensor materials. The application comprises the following steps: enabling the charge transfer coated semiconductor material to be in contact with gas to be detected; the charge transfer coated semiconductor material is a gas sensitive material formed by coating an organic component on the outer surface of an initial semiconductor through a charge transfer effect. According to the invention, the carrier mobility and the charge separation state life of the semiconductor are improved by utilizing the existence of charge transfer interaction, so that the gas detection sensitivity is improved, the working temperature is reduced, and the selectivity of the gas is improved by utilizing the redox characteristic of the organic coating component outside the semiconductor. The application of the invention not only retains the basic properties of the initial semiconductor, but also reduces the application cost by simplifying the material preparation mode, and has universality.

The invention discloses a Ni-BDC MOF / gamma-MnO2 composite photocatalyst material, a preparation method and application of the Ni-BDC MOF / gamma-MnO2 composite photocatalyst material in efficient catalysis of carbon dioxide reduction, Ni-BDC MOF has a two-dimensional sheet structure and Ni < 2 + > active sites for adsorbing CO2 and provides a framework for CO2 adsorption and reduction, gamma-MnO2 is added into the Ni-BDC MOF to form heterojunctions, and gamma-MnO2 components improve light absorption and enhance charge separation. The composite photocatalyst material prepared by the invention not only can effectively catalyze the reaction of reducing CO2 into CO and CH4 under visible light and conventional environmental conditions, but also does not need to use harmful solvents, and has better economic benefits and ecological benefits.

The invention relates to an iron oxide / bismuth vanadate composite photocatalytic material as well as a preparation method and application thereof in photocatalytic degradation of organic pollutants. The preparation method comprises the following steps: preparing a bismuth vanadate precursor by taking bismuth nitrate pentahydrate and ammonium metavanadate as raw materials; preparing bismuth vanadate by taking the bismuth vanadate precursor as a raw material and adopting a hydrothermal method; the bismuth vanadate is used as a substrate material, ferric chloride hexahydrate is used as an iron source, potassium iodate is used as an electron acceptor, a photodeposition method is adopted, iron oxide formed after Fe < 3 + > oxidation is selectively deposited on a {110} surface of the bismuth vanadate, and the iron oxide / bismuth vanadate composite photocatalytic material is obtained. The preparation method is simple and convenient to operate. The prepared iron oxide / bismuth vanadate composite photocatalytic material has proper forbidden bandwidth and good charge separation performance, effectively improves the photocatalytic activity, has a more excellent carbamazepine degradation effect compared with pure-phase BiVO4, and has a great application prospect in the aspect of degradation of antibiotic wastewater.