44results about "Cadmium sulfides" patented technology

The invention discloses a composite sensing electrode and a preparation method and application thereof, and belongs to the technical field of environmental detection.The preparation method comprises the steps that CNC is activated, then the activated CNC is modified with a CdS cluster material, a CdS-CNC composite electrode material is obtained, then a GCE electrode is modified with the CdS-CNC composite electrode material, and a CdS-CNC-GCE composite sensing electrode is obtained; the invention also discloses the CdS-coated CNC-GCE composite sensing electrode prepared by the method and application of the composite sensing electrode in detection of heavy metal elements in an aqueous solution. The CdS-coated CNC-GCE composite sensing electrode has the beneficial effects that an effective technical method and way are provided for improving the electrode performance of a heavy metal sensor, the prepared CdS-coated CNC-GCE composite sensing electrode is high in anti-interference performance and good in stability, the content of various heavy metals can be timely and rapidly detected, and the purpose of dynamically monitoring the change of the content of the heavy metals in the production activity period is achieved.

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 discloses a synthesis method of monodisperse urchin-shaped CdS, which comprises the following steps: S1, adding deionized water, a cysteine solution and a chromium salt solution into a reaction container, stirring and mixing, and introducing N2; s2, adding a sodium citrate solution into the solution obtained in the step 1, and stirring and mixing; s3, dropwise adding an alkaline solution into the mixed solution obtained in the step 2, and adjusting the pH value of the solution to 9-11; and S4, heating the solution of which the pH is adjusted in the step 3, and performing reflux reaction to obtain the sea urchin-shaped CdS. By adding a first ligand (cysteine), Cd < 2 + > is fixed in a (cysteine-Cd < 2 + >) n coordination polymer, so that the reaction activity of a precursor can be reduced, and a nucleation process occurs under a mass action law in the initial stage of reaction; and secondly, for the formed CdS, through combination of a second ligand (sodium citrate), electrostatic repulsion and steric hindrance effect between the CdS are remarkably increased, so that adsorption and fusion between the CdS are avoided.

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.

A system for producing agglomerated cadmium sulfide (CdS) nanospheres for supercapacitor electrode applications, comprising: a) a precursor production unit configured to maintain aqueous solutions of cadmium chloride monohydrate (CdCl2.H2O) and sodium sulfide (Na2S) at a concentration of 0.5 M; b) a reaction unit configured to combine the cadmium and sulfide precursors and maintain the reaction conditions at 80 °C to precipitate CdS nanospheres, the reaction unit comprising a temperature controller configured to maintain the temperature of the reaction unit; c) a stirring unit with a gear motor configured to continuously stir the reaction unit at 1050-1100 rpm to ensure uniform growth of the agglomerated nanospheres; d) a purification unit connected to the reaction unit and designed to receive, filter and wash precipitated CdS nanospheres with a filter component based on alcohol and double distilled water; (e) a heat treatment unit connected to the purification unit and configured to dry the CdS precipitate at 60 °C and anneal it at 450 °C to form pure cadmium sulfide; and f) an electrode preparation unit configured to deposit the CdS nanospheres on nickel foam substrates for electrochemical applications.

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 invention relates to the technical field of composite materials, in particular to a CdS-NiCo-LDH composite material and a preparation method and application thereof. According to the preparation method disclosed by the invention, NiCo-LDH is firstly obtained through hydrothermal reaction, and then CdS nanodots are introduced into NiCo-LDH interlayers through electrochemical reaction and in-situ vulcanization, so that the interlayer spacing is increased, and OH <-> transportation is facilitated; due to the construction of the CdS nanodots, the conductivity of the CdS nanodots is improved, electron migration of the CdS nanodots is facilitated, and electrochemical reaction active sites are increased. Meanwhile, the in-situ synthesis method not only avoids the adverse effect of secondary growth, but also reduces the volume expansion of NiCo-LDH in the oxidation-reduction reaction process.

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 invention discloses a high-efficiency and low-cost sulfide nanomaterial and a preparation method thereof. The nanomaterial is zinc sulfide or cadmium sulfide. The preparation method of the nanomaterial comprises the following steps: adding 0.001-0.002g of a surfactant to 20-50ml of water with a live bacteria content of 10,000-20,000 / ml, heating the mixture to 80-90°C, cooling the mixture to room temperature, adding 0.02-0.027g of a sulfur source, and stirring and mixing the mixture to obtain a material A; dissolving 0.1-0.3g of a zinc source or a sulfide source in 30-50ml of an aqueous solution containing 0.001-0.002g of a surfactant, and then adding 1-2mg of trypsin, stirring and mixing the mixture to obtain a material B; adding 2-4ml of octanol to the material A, mixing the mixture to obtain a mixed solution, and then allowing the mixture to stand, and dropwise adding 10ml of the mixed solution. 0.2 mol / L sodium hydroxide solution and material B are added dropwise for 5-8 min. After the addition is completed, the mixture is filtered, washed with water, washed with alcohol, and dried to obtain a nanomaterial. The present invention overcomes the shortcomings of the prior art, and the method is not only applicable to zinc sulfide, but also to cadmium elements in the same family as zinc, thereby expanding the scope of application of the method.

The invention discloses a cubic spinel structure sulfide composite gas-sensitive material, a gas-sensitive sensor and a preparation method and application thereof, and belongs to the technical field of gas sensors. The preparation method of the composite gas-sensitive material comprises the following steps: taking FeCl2, CdCl2 and InCl3 as metal sources, taking thiourea as a sulfur source, putting the metal sources and the sulfur source into solvent water, adding citric acid or sodium citrate serving as a dispersing agent, carrying out hydrothermal reaction to obtain a precursor material, calcining, and then carrying out annealing treatment to obtain cubic spinel structure FeIn2S4 / CdIn2S4 heterojunction material powder; the two gold electrodes and the ceramic tube of the gas-sensitive sensor are coated with the cubic spinel structure sulfide composite gas-sensitive material. The gas-sensitive sensor based on the cubic spinel structure sulfide composite gas-sensitive material is simple in manufacturing process, low in preparation cost and suitable for industrial batch production, and has a wide application prospect in the field of acetone detection in trace dangerous occasions.

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.

This invention belongs to the field of photocatalysis technology, and particularly relates to a CdS / TiO2 / CdS semi-inverted quantum well nanosheet, its preparation method, and its applications. This invention uses the ultrathin edge layer of TiO2 nanosheets as the quantum well bottom, cleverly utilizing the redox properties of TiO2 crystal heterojunctions, and employs a simple photoreduction and ion exchange method to grow CdS quantum dots on the TiO2 {101} surface as a quantum well barrier, thus constructing a CdS / TiO2 / CdS semi-inverted quantum well nanosheet. TiO2 is a wide-bandgap semiconductor with a bandgap of 3.2 eV, absorbing only about 4% of the ultraviolet light in sunlight. CdS is an n-type semiconductor with a bandgap of 2.4 eV, capable of absorbing visible light. Combining TiO2 and CdS extends the photoresponse range to the visible light region, improving the utilization efficiency of sunlight; the photocatalytic performance for the reduction of water and carbon dioxide is significantly enhanced.

The invention discloses a resourceful treatment method for smelting ash leached liquid. The leached liquid is subjected to multi-stage filtering purification, the purified filtrate is separated through a diffusion dialyzer, and waste acid and recycled acid are produced; carrying out vulcanization reaction on the obtained recycled acid, adding carbide slag into the acid wastewater obtained after the reaction for neutralization and dehydration to obtain an industrial byproduct gypsum, carrying out advanced treatment on the wastewater obtained after separation, and discharging the produced recycled water up to the standard or recycling the recycled water to each production water point; adding nano-iron and ozone into the produced waste acid, and reacting under micro-positive pressure to generate precipitate; the method comprises the following steps: filtering arsenic-precipitated liquid, carrying out sulfuration reaction on the arsenic-precipitated liquid, carrying out solid-liquid separation after the reaction, returning the produced sulfuration slag ingredients to a furnace to recover valuable metals such as zinc and cadmium, adding carbide slag into the filtrate obtained by separation, neutralizing and dehydrating to obtain an industrial byproduct gypsum, carrying out advanced treatment on the obtained sewage, and discharging the produced reuse water up to standard or recycling the reuse water for each production water point. By means of the method, resourceful treatment can be carried out on the smelting ash leached liquid, and the environment-friendly treatment concept of recycling non-ferrous metal and arsenic resources is embodied.

The present invention discloses a composite sensing electrode, a preparation method thereof, and an application thereof, belonging to the field of environmental detection technology. The preparation method comprises activating CNC, then modifying the activated CNC with a CdS cluster material to obtain a CdS@CNC composite electrode material, and then modifying a GCE electrode with the CdS@CNC composite electrode material to obtain a CdS@CNC-GCE composite sensing electrode. The present invention also discloses the CdS@CNC-GCE composite sensing electrode prepared by the above method and the application of the composite sensing electrode in the detection of heavy metal elements in aqueous solution. The beneficial effects of the present invention are: providing an effective technical method and approach for improving the performance of heavy metal sensor electrodes; the prepared CdS@CNC-GCE composite sensing electrode has strong anti-interference ability and good stability, and can promptly and quickly detect the content of multiple heavy metals, thereby achieving the purpose of dynamically monitoring the changes in heavy metal content during production activities.

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 present invention discloses a method for preparing a sulfur-rich bimetallic co-catalyst formed by in-situ light-induced deposition and photocatalytic hydrogen production thereof, wherein the bimetallic co-catalyst is formed by in-situ light-induced deposition and photocatalytic hydrogen production thereof. 2+x W heteroatom was introduced to form MoWS 2+x Bimetallic co-catalysts increase the active sites of coordinated unsaturated S and optimize the S-H ads The bond energy is increased, promoting the desorption of atomic H, thereby improving the hydrogen evolution activity of sulfur vacancy-modified CdS under visible light. The bimetallic cocatalyst prepared by this method has the characteristics of rich active sites, rapid charge transfer, and extended carrier lifetime. The preparation method of the entire material has the advantages of short time consumption, low energy consumption, simple operation, and easy repeatability. It maximizes the catalytic activity of the cocatalyst and establishes a carrier interface transmission channel, providing a strong theoretical basis and practical approach for the rational construction of high-efficiency functional photocatalysts. 2+x / CdS v The SEM image shows the crystal rod morphology, MoWS 2+x / CdS v The highest hydrogen production rate of the crystal rod under 300W Xe (λ≥420nm) lamp reached 9166.13μmol·h ‑1 ·g ‑1 .

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.