12 results about "CHLORIDE HEXAHYDRATE" patented technology

The application belongs to the technical field of photocatalytic materials, and particularly relates to a semi-metal carbon nitride / metal organic framework MIL-53Fe heterojunction photocatalyst, a preparation method and application thereof. The mass ratio of the semi-metal carbon nitride and the metal organic framework MIL-53Fe is 1:10-3:10. The preparation method comprises the following steps: dissolving sodium tricyanomethanide and 1-butyl-3-methyl imidazole chloride in deionized water, and obtaining the semi-metal carbon nitride by using a thermal polymerization method; dissolving iron chloride hexahydrate and 1,4-benzenedicarboxylic acid in dimethylformamide, and then adding the semi-metal carbon nitride, and obtaining the semi-metal carbon nitride / metal organic framework MIL-53Fe heterojunction photocatalyst by using a hydrothermal method. The formation of the heterojunction can greatly improve the photocatalytic reduction activity of the semi-metal carbon nitride / metal organic framework MIL-53Fe on carbon dioxide.

This invention belongs to the field of tempered laminated glass technology, specifically relating to a bubble-free composite molding process for tempered laminated glass. A functional coating is also provided, which is prepared from the following components: modified silicone-acrylic emulsion, modified nano-cesium tungsten bronze, curing agent, dispersant, leveling agent, defoamer, silane coupling agent, ultraviolet absorber, film-forming aid, and deionized water. This invention utilizes the crosslinking modification of vinyltriisopropoxysilane and the grafting modification of vinylphosphonic acid to effectively improve the interfacial bonding force between the emulsion film and the glass substrate and functional fillers. Simultaneously, a modifier prepared by aminotrimethylenephosphonic acid and lanthanum chloride hexahydrate is used to modify the surface of nano-cesium tungsten bronze, solving the technical problem of easy agglomeration of unmodified nano-cesium tungsten bronze, thus laying the foundation for the high performance of functional coatings and tempered laminated glass.

This invention discloses a process and coating structure for rare earth modified trivalent chromium pearl chromium plating on zinc alloys. The process includes sequentially preparing a cyanide-free copper plating layer, a cyanide-free copper-zinc alloy plating layer, a high-corrosion-resistant nickel-phosphorus alloy plating layer, a bright nickel-cobalt alloy plating layer, a pearl nickel plating layer, a rare earth modified trivalent chromium pearl chromium plating layer, and an anti-discoloration protective film on a zinc alloy substrate. The rare earth modified trivalent chromium pearl chromium plating process is as follows: chromium chloride hexahydrate 90-130 g / L, potassium chloride 90-160 g / L, ammonium chloride 90-160 g / L, ammonium bromide 18-28 g / L, ammonium formate 40-60 g / L, boric acid 45-65 g / L, rare earth additives 8-12 mL / L, leveling agent 2-4 mL / L, accelerator 1-3 mL / L, plating bath pH 2.5-3.2, plating bath temperature 25-35℃, and cathode current density 8-16 A / dm². The rare earth additives have a synergistic effect on improving the performance of trivalent chromium plating solution. No rust was observed on the surface of the plated parts after undergoing a neutral salt spray test for 132 hours according to GB / T 10125–2021 standard.

This invention discloses a molecular sieve-based composite adsorbent and its preparation method, relating to the field of wastewater treatment technology. The molecular sieve-based composite adsorbent is composed of phosphorus-modified ZSM-5 molecular sieve co-modified with iron and lanthanum, 3-aminopropyltriethoxysilane, sodium alginate, and aluminum chloride hexahydrate. The grafted and co-modified ZSM-5-based adsorbent is embedded and fixed in an aluminum alginate gel network, forming a multi-level composite adsorbent based on molecular sieves and possessing multiple active centers including metal oxides, amino groups, and a gel layer. This not only enhances the adsorption capacity for various heavy metals through abundant adsorption sites but also effectively reduces the material's sensitivity to pH changes through physical barriers and stabilizing components, maintaining good stability and adsorption performance within the pH range of 4-9.

This invention relates to the field of water treatment chemicals, and is used to solve the problem that existing water treatment chemicals are unable to remove substances such as Pb from water. 2+ Cd 2+ To address the technical problem of heavy metal ion contamination, this invention provides a water pollution treatment agent and its preparation method. The preparation method includes the following steps: synthesizing MOFs using aluminum chloride hexahydrate and 2-aminoterephthalic acid; using crown ether and povidone K30 as auxiliary agents; and modifying the MOFs with tannic acid. This water pollution treatment agent can effectively adsorb and absorb heavy metal ions, reducing their content. It is suitable for various types of polluted water bodies, protecting the ecological environment. Furthermore, the method for preparing the water pollution treatment agent is simple and easy to operate.

The application discloses a trivalent chromium plating process for high-strength steel structural parts, a process and a plated layer structure, which comprises sequentially plating cobalt-titanium alloy, cyanide-free copper, bright nickel, trivalent chromium and rare earth electrolytic protection on a high-strength steel base body. The trivalent chromium plating process composition and parameters comprise 90-130 g / L of chromium chloride hexahydrate, 80-120 g / L of potassium chloride, 100-150 g / L of ammonium chloride, 18-24 g / L of ammonium bromide, 45-50 g / L of ammonium formate, 50-60 g / L of boric acid, 8-12 mL / L of rare earth additive, 2-4 mL / L of trivalent chromium plating walking position agent, 1-3 mL / L of accelerator, 2.5-3.2 of plating solution pH value, 25-35 DEG C of plating bath temperature, 10-16 A / dm of cathode current density and moderate air agitation. 2 The hydrogen brittleness test is carried out according to HB 5067.1-2005 'Plating Process Hydrogen Brittleness Test Part 1: Mechanical Method', and the test result meets the standard requirement. The plated layer has excellent performance and good market prospect.

The application discloses a trivalent chromium plating process, which comprises the following process parameters: chromium chloride hexahydrate 80-140 g / L, potassium chloride 90-160 g / L, ammonium chloride 90-160 g / L, ammonium bromide 16-30 g / L, ammonium formate 40-60 g / L, boric acid 45-65 g / L, rare earth additive 8-12 mL / L, walking agent 2-4 mL / L, accelerator 1-3 mL / L, plating solution pH value 2.5-3.2, plating bath temperature 25-35 DEG C, cathode current density 10-18 A / dm 2 2, inert anode is adopted, and moderate air stirring is adopted. The rare earth additive comprises lanthanum chloride heptahydrate 40-140 g / L and praseodymium chloride heptahydrate 0-130 g / L. The steel base is subjected to cyanide-free copper plating + bright nickel plating + trivalent chromium plating + rare earth electrolytic protection, neutral salt spray test is carried out according to GB / T 10125-2021 'Salt Spray Test of Artificial Atmosphere Corrosion Test', and the prepared sample surface is free of corrosion product generation. The technical scheme obviously improves the corrosion resistance of the trivalent chromium plating layer, and has a good market prospect.

The application relates to a preparation method of aluminum oxide whiskers and belongs to the technical field of inorganic ceramic fibers. The method comprises the following steps: mixing and reacting metal aluminum and aluminum chloride hexahydrate to obtain an aluminum oxide sol; sequentially concentrating and aging the aluminum oxide sol to obtain an aged aluminum oxide sol; mixing the aged aluminum oxide sol with a spinning aid to obtain a spinning solution; electrostatically assisting high-pressure air spinning of the spinning solution to obtain aluminum oxide superfine fiber filaments; performing first-stage calcination treatment and second-stage calcination treatment on the aluminum oxide superfine fiber filaments to obtain aluminum oxide superfine fibers; and performing high-speed stirring treatment on the aluminum oxide superfine fibers under the condition that the rotating speed is 3000 rpm-5000 rpm to obtain aluminum oxide whiskers.

This invention discloses a method for controlling tungsten release from sediments using lanthanum-modified red clay, belonging to the field of sediment pollution control and water remediation technology. The invention uses natural red clay as raw material, reacting it with lanthanum chloride hexahydrate at room temperature to prepare lanthanum-modified red clay. This material is then uniformly applied to the surface of tungsten-contaminated sediments. Through the formation of stable lanthanum tungstate precipitates and inner spherical complexes between lanthanum ions and tungstate ions, the adsorption capacity and fixation efficiency for tungsten are significantly improved, effectively inhibiting the release of tungsten from sediments into overlying water. This invention features a simple preparation process, readily available raw materials, low cost, and environmental friendliness. The resulting stable product remains stable under reducing conditions, providing a long-lasting remediation effect. It can achieve a 56.1% fixation rate of dissolved tungsten in interstitial water of sediments, significantly reducing tungsten release flux and the content of unstable tungsten. This method is suitable for in-situ control and ecological remediation of tungsten-contaminated sediments in lakes, rivers, reservoirs, and other water bodies.

The application belongs to the technical field of photocatalytic materials, and particularly relates to a hexabismuth bismuth silver acid dicyesium / metal organic framework MIL-53Fe heterojunction photocatalyst and a preparation method and application thereof. The preparation method comprises the following steps: dissolving iron chloride hexahydrate and 1,4-benzenedicarboxylic acid in dimethylformamide, and obtaining a metal organic framework MIL-53Fe by using a hydrothermal method; dissolving silver bromide and bismuth bromide in preheated hydrobromic acid, then adding cesium bromide, and obtaining hexabismuth bismuth silver acid dicyesium by using an acid precipitation method; dissolving the metal organic framework MIL-53Fe and the hexabismuth bismuth silver acid dicyesium in anhydrous ethanol, and obtaining the hexabismuth bismuth silver acid dicyesium / metal organic framework MIL-53Fe heterojunction photocatalyst by using a mechanical stirring method. The formation of the heterojunction can greatly improve the photocatalytic reduction activity of the hexabismuth bismuth silver acid dicyesium / metal organic framework MIL-53Fe on carbon dioxide.

This invention discloses a rare earth modified trivalent chromium plating process and coating structure for magnesium alloys. The process includes sequentially preparing a chemical zinc plating layer, a cyanide-free copper plating layer, a cyanide-free copper-tin alloy plating layer, a bright nickel-copper alloy plating layer, a bright nickel-cobalt alloy plating layer, a rare earth modified trivalent chromium plating layer, and an anti-discoloration protective film on a magnesium alloy substrate. The rare earth-modified trivalent chromium plating process is as follows: 80-140 g / L chromium chloride hexahydrate, 90-160 g / L potassium chloride, 90-160 g / L ammonium chloride, 16-30 g / L ammonium bromide, 40-60 g / L ammonium formate, 45-65 g / L boric acid, 8-12 mL / L rare earth additives, 2-4 mL / L leveling agent, 1-3 mL / L accelerator, pH of the plating solution 2.5-3.2, plating tank temperature 25-35℃, cathode current density 8-16 A / dm², using an inert graphite rod as the anode, and moderate air agitation. The rare earth additives have a synergistic effect on improving the performance of the trivalent chromium plating solution. The plated parts undergo a neutral salt spray test for 140 hours according to GB / T 10125–2021, and no surface corrosion is observed.

The application discloses a rare earth modified trivalent chromium plating method for magnesium alloy after micro-arc oxidation and a plated layer structure, which comprises, from inside to outside on a magnesium alloy substrate, a micro-arc oxidation layer, a high-phosphorus chemical nickel plating layer, a bright nickel-cobalt alloy plating layer, a rare earth modified trivalent chromium plating layer and a rare earth electrolytic protective film. The rare earth modified trivalent chromium plating process comprises the following steps: 90-130 g / L of chromium chloride hexahydrate, 90-160 g / L of potassium chloride, 90-160 g / L of ammonium chloride, 18-28 g / L of ammonium bromide, 40-60 g / L of ammonium formate, 45-65 g / L of boric acid, 8-12 mL / L of a rare earth additive, 2-4 mL / L of a walking agent, 1-3 mL / L of a promoter, a plating solution pH value of 2.5-3.2, a plating bath temperature of 25-35 DEG C, a cathode current density of 8-16 A / dm2, an inert graphite rod as an anode and moderate-strength air agitation. The rare earth additive has a synergistic effect on improving the performance of the trivalent chromium plating solution. The plated part is subjected to a neutral salt spray test according to the GB / T 10125-2021 standard for 136 h, and the surface is free of rust.