8 results about "Hydrothermal deposition" patented technology

The application provides a surface-coated anti-corrosion dioxin-resistant silicon carbide wear-resistant powder material, and relates to the technical field of silicon carbide materials. The material takes cubic crystal type beta-SiC nano powder as a matrix, realizes the combination of high-temperature corrosion resistance, high wear resistance and high-efficiency dioxin prevention by constructing a gradient coating structure of 'Si-O-C transition layer / ZrO2-Al2O3-Y2O3 middle layer / SiO2-rare earth oxide-phosphotungstic acid multifunctional outer layer'. The preparation method of the material comprises key steps of matrix etching, transition layer construction, hydrothermal deposition and atmosphere calcination, and the process is controllable and has good repeatability. The obtained powder has excellent long-term protection performance, good dispersibility and stable structural integrity, and is suitable for fields of wear-resistant coating, composite reinforcement and waste gas treatment in harsh environments.

The application discloses a kind of foam nickel load iron nickel bimetallic phosphide heterojunction catalyst and its preparation method and application, belong to electrocatalytic material technical field.The application is in situ grown by hydrothermal deposition in combination with low-temperature phosphorization process, and is prepared on foam nickel base Phosphide iron / Phosphide nickel heterojunction catalyst (Fe2P / Ni2P@NF).The prepared catalyst shows excellent performance in the electrocatalytic reduction of nitrate synthesis ammonia and high nitrate wastewater degradation.The preparation process of the catalyst of the application is simple, low in cost, and little to environmental pollution, and the self-supporting electrode prepared by integration can be directly applied to proton exchange membrane electrolytic cell, and has wide application prospect.

The invention discloses a high-temperature-resistant soft magnetic powder core material and a preparation method thereof. The high-temperature-resistant soft magnetic powder core material comprises iron-based magnetic powder and a composite insulating coating, the composite insulating coating is of a gradient structure and sequentially comprises an amorphous iron phosphate transition layer, a lithium aluminum oxide layer embedded with nano zirconium oxide particles and a sodium silicate film layer from inside to outside. According to the preparation method, firstly, iron-based magnetic powder is pretreated, then passivated powder is prepared through magnetic field-assisted hydrothermal deposition, then coated powder is prepared through a sol-gel method, and finally, the high-temperature-resistant soft magnetic powder core material is obtained through rotary heat treatment. The high-temperature resistance of the soft magnetic powder core material can be optimized, and the resistivity, compactness and high-temperature stability of the insulating coating film layer are improved, so that the loss of the powder core material is reduced, and the quality reliability of the powder core material is improved.

The invention provides a preparation method of a red-mud-based photoelectrode and application of the red-mud-based photoelectrode in photoelectrocatalysis, and belongs to the technical field of solid waste resource utilization and photoelectrocatalysis. Industrial solid waste red mud is used as a raw material, a precursor solution is obtained through acid digestion treatment, a solution system is optimized by regulating and controlling the pH value, a thin film grows on a substrate material through the hydrothermal deposition technology, and finally the red mud-based photoelectrode is obtained through high-temperature calcination. The method adopted by the invention is simple and convenient in process and low in raw material cost, iron-based components such as Fe2O3 rich in the red mud can be efficiently activated, and in-situ doping and structure regulation and control of various metal elements are realized. The prepared red mud-based photoelectrode can be applied to the field of photoelectrocatalysis, including hydrogen production through water decomposition, biomass conversion, solid waste recycling and the like. According to the method, waste is treated with waste as the core, a new way is opened up for comprehensive utilization of the red mud solid waste, and the method has good application potential in the fields of environment and energy.

According to the method, an auxiliary solvent N, N-dimethylacetamide (DMAC) is added into a precursor solution for hydrothermal deposition of the antimony sulfide thin film to adjust the deposition rate, so that the thickness of the thin film is optimized, the morphology of the thin film is improved, the crystallinity is improved, the defect density of the thin film is reduced, and the performance of a device is improved. The antimony sulfide solar cell comprises a conductive substrate (including FTO and the like), an electron transport layer, an antimony sulfide solar cell absorption layer and a counter electrode. The DMAC can promote grain polymerization of the antimony sulfide thin film, increase the grain size and reduce electric leakage channels of the solar cell. And DMAC has the effect of adjusting the deposition rate, so that the reaction is slower to obtain a more appropriate thickness of the absorption layer. By constructing an effective antimony sulfide thin film solar cell structure, the device performance of the antimony sulfide solar cell is improved.

The invention discloses an ion selective groundwater remediation system and method based on a composite adsorption material, the system comprises an in-situ PRB module, an ex-situ packed bed module and a regulating reservoir, the in-situ PRB module and the ex-situ packed bed module are both internally provided with the composite adsorption material; the composite adsorption material is composed of, by mass, 60-80% of a biochar matrix, 10-20% of a nanometer iron oxide load layer and 10-20% of a modified zeolite coating, the preparation method of the composite adsorption material comprises the steps of pyrolysis, hydrothermal deposition and surface modification, the system adopts an acid pickling-organic solvent elution-thermal regeneration combined process as a regeneration process, and the composite adsorption material is prepared through the following steps: preparing the composite adsorption material; the material cost is reduced by 40%, the adsorption capacity is improved by 3-5 times, the adsorption effect is greatly improved through twice treatment, heavy metal / organic pollution synchronous removal is achieved through the component synergistic effect, the recovery process is simplified through the magnetic separation technology, and the operation and maintenance cost is reduced.

The invention discloses an In2S3-CeO2 / HZSM-5 bifunctional catalyst and an application of the In2S3-CeO2 / HZSM-5 bifunctional catalyst in separation of guaiacol and veratrole. The catalyst is prepared by loading a visible light responsive In2S3-CeO2 heterojunction on an HZSM-5 molecular sieve subjected to pore expansion and surface modification by ammonium nitrate through a hydrothermal-deposition method. The shape-selective adsorption effect of the HZSM-5 molecular sieve can preferentially enrich guaiacol molecules, and the In2S3-CeO2 heterojunction can efficiently activate oxygen to generate active oxygen species under the irradiation of visible light, so that the adsorbed guaiacol is subjected to selective in-situ photocatalytic degradation immediately, and the guaiacol is gradually mineralized into CO2 and H2O. Through the synergistic effect of photocatalysis and adsorption, guaiacol is efficiently and selectively removed, so that the separation selectivity and the purification efficiency of the veratrole product are remarkably improved.

The invention mainly researches and utilizes a post-selenylation method to improve the energy band arrangement of the antimony sulfide solar cell. Firstly, proper raw materials and solvents are selected, antimony potassium tartrate hemihydrate and sodium thiosulfate pentahydrate are used as precursor materials of Sb and S, and an antimony sulfide thin film is prepared through a hydrothermal deposition method. And carrying out energy band engineering treatment on the surface of the antimony sulfide film. The influence of energy band engineering processing on the aspects of thin film morphology, crystal structure, band gap, energy level position and the like is researched. Under the condition of energy band engineering treatment, the crystallinity of the thin film is improved, crystal grains are increased, the morphology of the antimony sulfide thin film is improved, the energy level orientation is good, compared with a control group treated by the energy band engineering, the photoelectric conversion efficiency is remarkably improved, and no other impurities are introduced into the final absorption layer thin film.