32results about "Cadmium sulfides" patented technology

The invention relates to the field of nano materials and photonic crystal materials, in particular to nano particles, preparation of the nano particles and application of the nano particles in self-assembly of three-dimensional non-close-packed photonic crystals. The nanoparticles can be self-assembled into a three-dimensional non-close-packed photonic crystal in a concentration range of 1 wt%-60 wt%. According to the invention, the problem that the self-assembly of the three-dimensional non-close-packed colloid photonic crystal is difficult to realize at low concentration at present is solved. By adjusting the mass fraction of the particles in a solution, the three-dimensional non-close-packed colloidal photonic crystal with rich colors can be formed through self-assembly, and the three-dimensional non-close-packed colloidal photonic crystal has wide application prospects in the fields of sensing, display and the like.

This disclosure relates to a process for removing cadmium and copper, and optionally arsenic, from phosphoric acid solutions typically obtained by wet methods. The process can also allow for the selective and separate recovery of cadmium, copper, and arsenic.

This invention discloses a superhydrophobic unsaturated transition metal chalcogenide compound, its synthesis method, and its applications. The invention involves heating chalcogenide powder to above its melting temperature to form a molten chalcogenide. This molten chalcogenide is then mixed with a reducing agent to undergo a disproportionation reaction. A strongly acidic solution containing transition metal cations is then added for aging, yielding a transition metal chalcogenide compound with a uniform porous structure, numerous surface defect sites, and a superhydrophobic surface. This transition metal chalcogenide compound exhibits good water resistance and high selective adsorption performance for nonpolar atoms and molecules, making it suitable for the removal of heavy metals or oxides from high-humidity flue gas. Furthermore, its unique porous structure and numerous catalytically active sites demonstrate good adsorption, capture, and catalytic conversion activity for oxidizing gases, making it suitable as an electroreduction catalyst.

This invention discloses a cubic spinel-structured sulfide composite gas-sensitive material, a gas sensor, its preparation method, and its application, belonging to the field of gas sensor technology. The preparation method of this composite gas-sensitive material involves using FeCl2, CdCl2, and InCl3 as metal sources, and thiourea as a sulfur source, placing them together in a solvent of water, adding citric acid or sodium citrate as a dispersant, and obtaining a precursor material through a hydrothermal reaction. After calcination and annealing, a cubic spinel-structured FeIn2S4 / CdIn2S4 heterojunction material powder is obtained. The two gold electrodes and the ceramic tube of the gas sensor are coated with the cubic spinel-structured sulfide composite gas-sensitive material. The gas sensor based on this invention, made from a cubic spinel-structured sulfide composite gas-sensitive material, has a simple manufacturing process, low production cost, and is suitable for industrial mass production. It has broad application prospects in the field of acetone detection in trace hazardous situations.

The present invention relates to a method for removing cadmium and copper and optionally arsenic contained in phosphoric acid solutions typically obtained in wet processes. The process also enables selective and separate recovery of cadmium, copper and arsenic.

This invention belongs to the field of photoelectrochemical detection, specifically relating to a method for fabricating a photo-assisted all-solid-state zinc-air battery self-powered sensor based on a signal reversal strategy and its application in detecting theophylline. Using CuInS2 as the photocathode, CdS is loaded onto the photocathode using a split aptamer technique. Polished zinc foil is used as the anode, and PVA gel polymer is used as the solid electrolyte to construct a photo-assisted all-solid-state zinc-air battery self-powered sensor based on a signal reversal strategy. This invention achieves signal reversal by incorporating split aptamer technology, thereby significantly improving the detection sensitivity for antioxidants. The constructed photo-assisted all-solid-state zinc-air battery self-powered sensor based on a signal reversal strategy also has a wide detection range, low detection limit, and low detection cost.

The invention belongs to the technical field of photocatalyst composite materials, and particularly relates to a covalent bond bonded MoBTx / CdS composite material and a preparation method and application thereof.According to the MoBTx / CdS composite material, rod-shaped CdS and two-dimensional layered MoBTx are compounded through an in-situ growth strategy, covalent bonding between Mo atoms and S atoms is achieved at an interface, and the MoBTx / CdS composite material is obtained. Therefore, a strong-coupling heterogeneous interface is constructed. The covalent bond mediated composite structure can significantly enhance visible light absorption and optimize carrier separation and transmission kinetics, thereby improving the activity and stability of hydrogen production by photocatalytic decomposition of water. The material is excellent in environmental adaptability and can keep good hydrogen evolution performance under complex water quality and low-temperature conditions. The research provides a new interface engineering idea for designing an efficient and stable semiconductor-metal boride photocatalyst.

The application relates to a preparation method and application of chiral two-dimensional cadmium sulfide nanosheets. The application aims to solve the problem that it is difficult to construct non-layered chiral two-dimensional inorganic nanomaterials. The method comprises the following steps: placing a first open reaction container and a second open reaction container in a sealable container, adding a cadmium acetate solution into the first open reaction container, then adding a left-rotational ibuprofen / chloroform solution drop by drop, adding a sodium sulfide aqueous solution into the second open reaction container, then adding a hydrochloric acid solution drop by drop, and finally sealing and standing. The application is used for preparing a circularly polarized light detection device for detecting left-rotational / right-rotational circularly polarized light. The application is used for the preparation and application of chiral two-dimensional cadmium sulfide nanosheets.

The application belongs to the technical field of nano material heterojunction, and particularly relates to a NiO / CdS nanoparticle heterojunction array and a preparation method and application thereof. The application comprises a substrate and a NiO / CdS heterojunction array in-situ grown on the surface of the substrate; the substrate is an Al2O3 gas sensitive substrate; the NiO / CdS heterojunction array is composed of NiO nanosheets and CdS nanoparticles, wherein the NiO nanosheets are in an array structure of vertical interlaced growth, and the CdS nanoparticles are uniformly dispersed on the surface of the NiO porous nanosheets. The preparation process of the application is simple, and the cost is low. The NiO / CdS heterojunction array prepared by the application has good heterojunction interface contact, and the size and distribution density of the CdS nanoparticles in the NiO / CdS heterojunction array can be conveniently regulated. In addition, the NiO / CdS nanoparticle heterojunction array can be applied in room temperature gas sensing, and specifically in high selectivity detection of triethylamine at room temperature under green light excitation.

The application belongs to the field of electrochemical detection, and particularly relates to a novel water-vapor coupling photoelectric self-powered electrochemical sensor for detecting enrofloxacin and a preparation method thereof. A glass substrate is used as a substrate, a copper foil tape is used as a positive electrode and a negative electrode, CdS (cadmium sulfide) and a cobalt-based metal organic framework (ZIF-67) are used as water-vapor / photovoltaic materials to construct a heterojunction for preparing a water-vapor generator to realize sustainable power generation. The CdS / ZIF-67 heterojunction is beneficial to the separation of photo-generated carriers under illumination and synergistically enhances the water evaporation effect. An enrofloxacin (ENR) aptamer is assembled to construct a water-vapor / photovoltaic self-powered electrochemical sensor. With the help of split aptamers, the ENR detection exhibits high sensitivity and high specificity, and provides a new strategy for self-powered electrochemical detection. The water-vapor / photovoltaic self-powered electrochemical sensor has a wide detection range, high sensitivity and low detection limit.

The invention discloses an Au-Pd / CdS nanorod and a synthesis method thereof, and the synthesis method comprises the following steps: S1, dissolving Cd (NO3) 2.4 H2O and thiourea in ethanediamine according to a molar ratio of 1: (2.5-3.5), and carrying out a hydrothermal reaction at 180-200 DEG C for 18-36 h to prepare a CdS nanorod; and S2, dispersing the CdS nanorods in water, adding a mixed solution containing HAuCl4. 3H2O and PbCl2, regulating the molar ratio of Au to Pd to be (1: 9)-(9: 1), stirring and adsorbing for 8-12 hours, adding NaBH4, reducing for 10-15 hours at room temperature, and washing and drying to obtain the Au-Pd / CdS composite catalyst.

The invention discloses a quantum rod with stable chirality and a preparation method thereof.The preparation method of the quantum rod with stable chirality comprises the steps that zinc stearate is dissolved in octadecene under the high-temperature condition, a selenium source is added to form a Se-TOP solution, and a ZnSe core solution is successfully prepared; purifying the ZnSe core, and dispersing the ZnSe core in a TOP solution to obtain a ZnSe-TOP core mother solution; then, the ZnSe-TOP core mother liquor is added into a reaction solution composed of a Cd precursor and a sulfur precursor, epitaxial growth is carried out under the high-temperature condition, and ZnSe / CdS quantum rods with different length-diameter ratios are obtained; and carrying out ligand exchange reaction on chiral cysteine and the surface of the quantum rod to obtain the II-type chiral ZnSe / CdS quantum rod. The prepared II-type quantum rod has good optical performance and stable chiral effect, and the chiral optical effect is not affected by the space structure of the core / shell structure of the quantum rod.

The present application relates to the technical field of inorganic nanometer catalyst material manufacturing, and particularly relates to a multi-legged nanocrystal for photocatalytic reforming of biomass and derivatives thereof to produce hydrogen as well as a preparation method and application thereof. The multi-legged nanocrystal takes spherical quantum dots as a core, and grows multiple nanometer arms on the surface of the core under the regulation of a surfactant. The specific surface area of the multi-legged nanocrystal is large, and more surface active sites can be exposed, so as to improve the migration efficiency of photo-generated carriers. Meanwhile, the nanometer arms can effectively solve the problems of electron and hole recombination and electron migration in photocatalysis. As the main light absorption unit, the nanometer arms absorb photons, generate electrons, and make the electrons gather on the nanometer arms, thereby inhibiting the recombination of electrons and holes and accelerating the photocatalytic reaction and improving the photocatalytic efficiency. The size of the multi-legged nanocrystal is adjustable, and the stability is good, so that the problem of photo corrosion in photocatalysis can be effectively alleviated.

The application discloses a preparation method of Cu2S-CdS heterojunction nanosheet, and specifically comprises the following steps: (1) vacuum heating of CuSCN and oleylamine, saturated Ar is introduced, heating reaction is carried out, cooling to room temperature, adding toluene and methanol, centrifugation, washing, drying, and obtaining Cu2S hexagonal nanosheet; (2) mixing Cd(NO3)2 4H2O methanol solution, tetrahydrofuran, TOP and Cu2S hexagonal nanosheet toluene solution, degassing treatment, reaction in inert gas atmosphere, centrifugation, washing, ultrasonic, centrifugation, washing, dispersion, centrifugation, drying, and obtaining the product. The application does not use toxic S source, but uses CuSCN as S source and Cu source to prepare Cu2S matrix, and applies the matrix to cation exchange of electrocatalytic CO2 reduction Cu2S, and uses room temperature stirring to prepare hexagonal nanosheet with perfect morphology, uniform size and stability. The method is simple, low in cost, high in yield, small in loss and easy to prepare.

The invention discloses a method for regulating and controlling sulfur vacancies in sulfide, and relates to the field of functional materials. The preparation method comprises the following specific steps: S1, dissolving metal salt and a sulfur source in deionized water to obtain a mixed solution A; s2, adjusting the pH value of the mixed solution A to 2-5 by using a pH regulator, and adding a sulfur vacancy regulator into the mixed solution A to obtain a mixed solution B; and S3, carrying out a hydrothermal reaction on the mixed solution B, cooling to room temperature, and filtering, washing and drying the reacted solution to obtain the sulfide rich in sulfur vacancies. The sulfur vacancy regulator is introduced before hydrothermal treatment, the sulfide rich in sulfur vacancies can be directly prepared, the process is simple, the concentration of the sulfur vacancies in the sulfide can be directly regulated, and the prepared sulfide has good photocatalytic performance.

The application relates to the technical field of composite materials, in particular to a CdS-NiCo-LDH composite material and a preparation method and application thereof. In the application, NiCo-LDH is obtained through a hydrothermal reaction, then CdS nanodots are introduced into the interlayer of the NiCo-LDH through an electrochemical reaction and in-situ sulfuration, so that the interlayer spacing is increased, the transportation of OH- is facilitated, the conductivity of the CdS nanodots is improved, the electron migration is facilitated, and the electrochemical reaction active sites are increased. Meanwhile, the in-situ synthesis method not only avoids the adverse influence of secondary growth, but also reduces the volume expansion of the NiCo-LDH in the redox reaction process.

The invention provides a preparation method and application of an epitaxial interface metal / semiconductor heterojunction, and belongs to the field of preparation of nano materials. The method comprises the following steps: providing a semiconductor / semiconductor heterojunction as a template, and then preparing a metal / semiconductor nano heterojunction material with a high-yield epitaxial connection interface through a ligand-assisted chemical conversion method, thereby avoiding the formation of a non-epitaxial interface due to macrolattice mismatch in the direct growth process of metal and a semiconductor. The controllability of a metal and semiconductor interface structure is shown; the metal / semiconductor heterojunction nano material of the epitaxial interface shows the reduction performance obviously superior to that of a metal / semiconductor heterojunction material of a non-epitaxial interface when selectively irradiated by plasmon exciting light with the same intensity. The invention develops a ligand-assisted chemical conversion synthesis strategy, and provides a new way for designing and developing a metal / semiconductor heterojunction nano material with a controllable interface structure.

This invention discloses the use of CdS as a photocatalyst in the preparation of allantoin. The invention employs CdS as a photocatalyst to carry out a photocatalytic reaction of uric acid as a substrate under visible light irradiation. Uric acid is oxidized, hydrolyzed, and decarboxylated to convert into allantoin. Specifically, after 4 hours of reaction, the conversion rate of uric acid to allantoin using CdS as a photocatalyst reaches 95%. Further extending the reaction time to 6 hours results in complete conversion of uric acid to allantoin. Compared to traditional chemical synthesis methods, this invention uses CdS as a photocatalyst to photocatalytically convert uric acid into allantoin. Through the directional regulation of photogenerated electron-hole pairs, selective activation of chemical bonds is achieved, resulting in advantages such as high conversion rate, mild reaction conditions, and low energy consumption.

The invention provides a cadmium sulfide photocatalyst based on different crystal faces and a preparation method and application thereof, and the preparation method comprises the following steps: dispersing a cadmium source and a sulfur source in a solvent, magnetically stirring at room temperature, then transferring the mixture to a hydrothermal kettle with a polytetrafluoroethylene lining, and carrying out hydrothermal reaction at room temperature to obtain the cadmium sulfide photocatalyst based on the different crystal faces. Heating the kettle body to 200 DEG C in a gradient manner at a heating speed of 10 DEG C / min, preserving heat for 24 hours, then cooling to room temperature, performing centrifugal separation on the cooled sample, alternately washing the sample with deionized water and ethanol for multiple times, and performing vacuum drying in a drying oven to obtain the cadmium sulfide photocatalyst. The preparation process and technology are relatively simple, safe and high in feasibility, large-scale application can be achieved, high-activity CdS is obtained, and the effect of efficiently degrading semi-coke wastewater to produce hydrogen at low cost without pollution is achieved.

The application relates to the field of nanomaterials and photonic crystal materials, in particular to a kind of nanoparticles and preparation and application of three-dimensional non-close-packed photonic crystal of self-assembly of the nanoparticles, the nanoparticles are colloidal nanoparticles with ionized phenolic hydroxyl on the surface, and the nanoparticles can be self-assembled into three-dimensional non-close-packed photonic crystal in the concentration range of 1 wt%-60 wt%. The application solves the problem that three-dimensional non-close-packed colloidal photonic crystal is difficult to realize self-assembly at low concentration. By adjusting the mass fraction of particles in solution, three-dimensional non-close-packed colloidal photonic crystal with rich colors can be self-assembled, and has wide application prospect in the fields of sensing, display and the like.

This invention provides a material that can generate hydrated electrons using a lower-energy, smaller, and less expensive light source, does not contain rare metals, is more cost-effective, more sustainable, and more versatile, and can be used for applications such as hydrated electron generation and decomposition of fluorine-containing compounds. [Solution] Particles represented by general formula (1):CdX [wherein formula (1) is an element of Group 16] are doped and / or adsorbed with a transition metal, and on the surface of the particles is general formula (2):-SR 21 -COOH[In formula (2), R 21 This represents an organic group having 1 to 20 carbon atoms. The nanoparticles include an organic ligand represented by ] and are for use in generating hydrated electrons, decomposing halogen-containing organic materials, or as photochromic materials.

The application discloses a method for regulating nonlinear optical properties of reduced graphene oxide by Au@CdS and an rGO-Au@CdS composite material, the Au@CdS core-shell structure is uniformly grown on the surface of the reduced graphene oxide, the core-shell structure is closely connected with the reduced graphene oxide, the rGO-Au@CdS composite material is successfully synthesized by using a solvothermal method, the nonlinear absorption of the composite material has the characteristic of transition from saturated absorption to reverse saturation, and the characteristic is more and more obvious with the increase of light intensity. With the increase of the size of the Au@CdS composite structure, the intensity of the reverse saturation absorption is also improved.

The invention discloses a NiS / CdS heterojunction material as well as a preparation method and application thereof. The preparation method comprises the following steps: dispersing hexagonal CdS with exposed (001) crystal face, a soluble nickel source and a soluble sulfur source in ethylene glycol according to a molar ratio of CdS: Ni: S of 1: (0.5-1.5): (0.5-1.5), and reacting at a constant temperature of 180 + / -10 DEG C to obtain the NiS / CdS heterojunction material. According to the preparation method, in a single mild system, phase change-morphology cooperative regulation and control of NiS are realized in situ on a (001) crystal face exposed by hexagonal-phase CdS only through time regulation and control: gradient phase change of NiS from amorphous-NiS to alpha-NiS (hexagonal phase) to beta-NiS (rhombohedral phase) is realized for the first time, and multi-dimensional morphology evolution (quantum dot-amorphous state-crystal face exposed type-block-long rod type) is accompanied. Particularly, when the reaction time is 18-24 hours, the preparation method can be used for successfully preparing the NiS / CdS heterojunction material in which the alpha-NiS and beta-NiS double crystal phases coexist. In addition, the nanowire NiS / CdS heterojunction material with NiS extending in the axial direction of the CdS nanowire can be prepared through the preparation method, and a foundation is laid for promoting the nanowire NiS / CdS heterojunction material to be practical from the concept.

The invention relates to a high-entropy sulfide catalyst, a preparation method thereof and a lignin depolymerization electro-catalysis method, and belongs to the technical field of biomass recycling, electrochemistry and novel catalytic materials. The method solves the technical problems of single active site, poor selectivity and stability and harsh reaction conditions of the existing lignin depolymerization catalyst. The preparation method comprises the following steps: by adopting a one-pot hydrothermal synthesis process, dissolving five metal salts with equal molar ratio as precursors, adding a sulfur source and acetonitrile, transferring into a reaction kettle, reacting for 24 hours at 100-200 DEG C, and finally filtering, washing and drying to obtain the high-entropy sulfide catalyst. The catalyst utilizes the synergistic effect of multiple active sites and a formed single solid solution phase structure, is mainly used as an electro-catalytic material, and efficiently and highly selectively depolymerizes and converts lignin into high-value aromatic monomer chemicals under mild conditions.

The present disclosure relates to a method for removing cadmium and copper, and optionally arsenic, contained in phosphoric acid solutions typically obtained in a wet process. The method can also allow the cadmium, copper and arsenic to be recovered selectively and separately.

The invention discloses a preparation method and application of an Ag / sulfide semiconductor heterojunction material, and belongs to the field of nano materials. According to the invention, the Ag / sulfide semiconductor heterojunction can be obtained by firstly mixing the unsaturated aliphatic alkene containing Ag2S / semiconductor heterojunction with the unsaturated aliphatic amine solution, then adding the organic phosphine ligand and reacting at 150-200 DEG C for not less than 10 minutes, the preparation method is simple, the nucleation and growth rate between metal and a semiconductor does not need to be accurately regulated and controlled, the cost is low, and large-scale production is easy. According to the present invention, the method has characteristics of simple operation and wide substrate application range, the substrate adapted to the method comprises the Ag2S / CdS heterojunction, the Ag2S / ZnS heterojunction and the Ag2S / ZnCdS heterojunction, and is not limited by the lattice mismatch degree of the metal and the sulfide semiconductor, the prepared Ag / sulfide heterojunction material as the photocatalyst has excellent catalytic ability, and the plasmon-induced catalytic hydrogen production speed can achieve 585.4 [mu] mol / g / h.

The application belongs to the technical field of semiconductor light-emitting materials, and particularly relates to a size-controllable quantum dot, a preparation method thereof and application thereof. The quantum dot is prepared by the following method: a sample in an induction period of a quantum dot pre-nucleation stage is dispersed in a solvent, and the reaction is carried out at a temperature of 25-105 DEG C for 0.5-24h. The application can accurately control the particle size of the quantum dot and further adjust the light-emitting characteristics of the quantum dot, can effectively expand the application of the quantum dot, and has a good application prospect.

This invention discloses a composite ammonia sensor, its preparation method, and its application, belonging to the field of industrial and agricultural environmental monitoring technology. The preparation method involves producing cicada-like Fe2O3 via a hydrothermal reaction, followed by growing CdS quantum dots on the surface of the cicada-like Fe2O3 using a co-precipitation method to obtain Fe-Cd. Ncs Composite ammonia sensing material, preparation of Fe-Cd Ncs A slurry of composite ammonia sensing material and ethanol was prepared, and then coated onto a tubular electrode ceramic tube, which was subsequently welded onto the hexagonal base of the MQ sensor to obtain Fe-Cd. Ncs Composite ammonia sensor. This invention also discloses Fe-Cd prepared by the above-described method. Ncs A composite ammonia sensor and its application in ammonia residue detection. The beneficial effects of this invention are: constructing a CdS quantum well structure on the surface of a cicada-like Fe2O3, storing electrons inside CdS, endowing it with a high response value, and simultaneously exhibiting extremely high selectivity for ammonia, thus enabling Fe-Cd... Ncs The composite ammonia sensor has strong anti-interference capabilities, good stability, and high sensitivity, enabling it to detect ammonia quickly and promptly.

The invention belongs to the crossing field of nano functional materials and photocatalysis technology, and discloses a method for regulating and controlling the proportion of synthesis gas in a carbon dioxide reduction product, which comprises the following steps: preparing a series of cadmium sulfide photocatalysts with controllable sulfur vacancy concentration by regulating and controlling the molar ratio of a precursor cadmium source to a sulfur source in the synthesis process; the catalyst is applied to a reaction system for photocatalytic CO2 reduction coupled with benzyl alcohol oxidation, and the molar ratio of H2 to CO in the product synthesis gas can be adjusted within the range of 2.9: 1 to 6: 1 by changing the sulfur vacancy concentration in the catalyst, so that the feed gas requirements of downstream Fischer-Tropsch synthesis on different chemicals (such as aldehyde, alcohol and light hydrocarbon) are met. According to the method, the problem that the proportion of the photocatalytic synthesis gas is uncontrollable is solved, the total yield of the synthesis gas is increased by 8 times or more through vacancy engineering, meanwhile, high-value benzaldehyde is efficiently co-produced, and the method has the outstanding advantages of being high in regulation and control performance, high in yield, simple in process, good in stability, high in industrial application value and the like.

The invention discloses a cadmium sulfide photocatalyst, a preparation method thereof and application of the cadmium sulfide photocatalyst in preparation of carboxylic acid through olefin hydrocarboxylation, and belongs to the technical field of photocatalysis and organic synthetic chemistry. The catalyst is prepared by taking a cadmium source and a sulfur source as raw materials through a water / solvent thermal synthesis method, and the prepared cadmium sulfide catalyst can be well dispersed in water and various common organic solvents, keeps stable and has good visible light response capability; under the irradiation of visible light, the catalyst can show good activity of synthesizing carboxylic acid by photocatalytic reaction of olefin and formate.