443results about How to "Strong complexing ability" patented technology

The invention relates to gold potassium citrate for gold plating and a preparation method thereof. The gold potassium citrate is used to substitute for gold potassium cyanide in acidic and neutral gold plating technology. The problem that the product coverage area is too wide when gold citrate is used in the gold plating technology is solved. The technical scheme is that the gold potassium citrate is the mixed crystal of gold potassium cyanide and citric acid potassium salt and the chemical composition of the gold potassium citrate is KAu (CN)2 (K3C6H5O7. k1C6H8O7) k2, wherein KAu (CN)2 is gold potassium cyanide, K3C6H5O7.k1C6H8O7 is citric acid potassium salt which is mixed by potassium citrate K3C6H5O7 and citric acid C6H8O7, k1 is the molar ratio of potassium citrate to citric acid, is more than or equal to zero and is less than or equal to three, and k2 is the molar ratio of citric acid potassium salt to gold potassium cyanide, is more than or equal to one point three and is less than five. The method is mainly suitable for the acidic and neutral gold plating technology.

The invention provides a heavy metal-contaminated soil remediation agent. The remediation agent is prepared from, by weight, 30%-45% of quick lime, 10%-25% of biomass charcoal, 10%-15% of kieselguhr, 10%-15% of sodium bentonite, 10%-15% of activated aluminum oxide, 5%-10% of nitrilotriacetic acid, 1%-5% of sodium lignin sulfonate and 1%-5% of sodium dodecyl sulfate. A preparation method comprises the steps that the quick lime, the biomass charcoal, the kieselguhr, the sodium bentonite, activated aluminum oxide, nitrilotriacetic acid, sodium lignin sulfonate and sodium dodecyl sulfate are stirred and mixed to be uniform according to the weight ratio, and then the soil remediation agent is prepared. The prepared soil remediation agent has the good effect when cadmium-lead-zinc-mercury compound contaminated soil is remedied.

The invention discloses an electrolyte corrosion inhibitor for an aluminum-air cell, an electrolyte and a preparation method, belonging to the technical field of chemical batteries. The electrolyte corrosion inhibitor mainly comprises sodium hyposulfite which has a concentration of 0.005 to 0.2 mol / L in the electrolyte and may further comprise the auxiliary additive sodium stannate which has a concentration of 0.01 to 0.03 mol / L in the electrolyte. The aluminum-air cell provided by the invention has the advantages of simple composition, low cost, safety and accordance with environmental protection requirements, can substantially reduce the hydrogen evolution self-corrosion rate of an aluminum anode, enables the open circuit potential of the aluminum anode and working potential under the condition of impressed current to undergo substantial negative transfer, allows an aluminum anode alloy to have good corrosion resistance and high electrochemical activity and meets the requirement of an alkaline aluminum-air cell for large current density discharging.

The invention relates to a cationic flocculant based on collagen modification and a preparation method thereof. The cationic flocculant is prepared through the following steps of: 1) taking trypsin as hydrolytic agent to hydrolyze industrial gelatine to obtain collagen solution; 2) using glyoxylic acid or gallic acid to modify the obtained collagen solution aiming at increasing the content of carboxyl groups or phenolic hydroxyl groups on collagen molecules to obtain modified collagen solution; and 3) conducting complexation to the obtained modified collagen solution and ferric sulfate or aluminum sulfate according to mass ratio being 1:2 to 1:4 to obtain the cationic flocculant based on the collagen modification. The cationic flocculant can be used for treating waste drilling fluid and solves the problems that the preparation cost of the existing flocculant is high, the synthesized or degraded products are highly toxic and carcinogenic and serious environmental pollution is caused during the current treatment of the waste drilling liquid.

The invention discloses a preparation method of a carbon self-supported metal phosphide catalyst. The preparation method comprises the following steps: dispersing a transition metal element or a transition metal compound in distilled water to form a transition metal dispersion; uniformly mixing the transition metal dispersion with phytic acid, placing the obtained mixture in an oven, drying the mixture to form a colloidal material, and calcining the colloidal material in a microwave oven to obtain a catalyst precursor; and placing the catalyst precursor in a tubular furnace, carrying out calcining reduction in a H2 atmosphere, cooling the obtained material to a passivation temperature, introducing an inert gas containing low-concentration oxygen, and carrying out calcining passivation to obtain the carbon self-supported metal phosphide catalyst. In the present invention, the phytic acid can rapidly absorb microwaves, the transition metal phosphate precursor can be quickly obtained during microwave calcining, the phytic acid is carbonized when absorbing the microwaves and being rapidly heated in order to coat the transition metal phosphate precursor, and carbon wraps the carbon self-supported metal phosphide catalyst which is obtained by the reduction to form a slight carbon film in order to prevent the catalyst from being oxidized.

The invention discloses a separating membrane for filtering heavy metal ions, wherein the separating membrane is composed of a non-woven cloth layer, a porous support layer and an algin layer on the surface of the porous support layer; the non-woven cloth layer is coated with the porous support layer, the porous support layer is a membrane layer formed by mixing cellulose acetate, a pore-foaming agent and a solvent. The separating membrane prepared by the method has a favorable interception performance to heavy metal ions (such as Cd(II), Cu (II) and Fe (III)) in a water solution, and can be applied to waste water treatment in the chemical engineering industry.

The invention discloses a regenerated liquid of a vanadium and titanium-based selective catalytic reduction (SCR) denitration catalyst. The regenerated liquid comprises a cleaning liquid and an active replenishing liquid, wherein the cleaning liquid consists of alkaline organic salt, a surfactant and deionized water; the active replenishing liquid consists of weak acid, ammonium metavanadate, ammonium tungstate, cerous nitrate and deionized water. The cleaning liquid ingredient in the denitration catalyst regenerated liquid provided by the invention can eliminate adverse effects of harmful substances to the SCR denitration catalyst, and recover the pore pathway structure; the active replenishing liquid ingredient can improve the activity of the denitration catalyst, increase the thermal stability of the catalyst, and prolong the service life of the catalyst; the denitration ratio of the regenerated catalyst can reach 82%-90%; the SO2 / SO3 conversion rate is less than 1%; the service life of the regenerated liquid is mo than 85% of that of a fresh catalyst.

The invention discloses a high-voltage electrolyte containing cyclopentene dinitrile and a lithium-ion battery employing the electrolyte. The high-voltage electrolyte is characterized by comprising an electrolyte lithium salt, a non-aqueous organic solvent and an additive, wherein the additive comprises fluoroethylene carbonate and a cyclopentene dinitrile compound; a nitrile functional group -CN in the cyclopentene dinitrile compound and transition metal ions in a positive active material can generate complexation; catalytic decomposition of the electrolyte is reduced; dissolution of the metal ions is inhibited; and the crystal structure of the high-voltage positive active material is stabilized, so that the cycle performance and the high-temperature performance of the high-voltage battery are improved.

The invention provides a Cu<2+> chemical sensor, and a preparation method and application thereof. Based on an MOF nanomaterial, the invention combines with a Cu<2+> fluorescent probe to further prepare a Cu<2+> chemical sensor. The MOF nanomaterial ZIF-8 not only has specific adsorption capacity on Cu<2+>, but also has high porosity, high specific surface area, transition metal as center, chemical stability, regular structure, and diversified frame structure. A novel Cu<2+> sensor and fluorescent probe show good linear relationship with Cu<2+> ions, and the detection limit is 8.3*10<-9>mol / L and 5.2*10<-8>mol / L. The novel Cu<2+> sensor obtained by the present invention has a lower detection limit based on the original probe, and can be used for quantitative detection of Cu<2+> concentration the water.

The invention discloses a hydrogel material for treating heavy metal containing sewage. The hydrogel material is mainly prepared from, by weight, 30-50 parts of methacrylic acid, 20-30 parts of polyethylene glycol, 10-15 parts of sepiolite, 5.0-7.0 parts of polyvinyl alcohol, 3.0-5.0 parts of humic acid, 0.4-0.6 part of ammonium persulfate, 0.05-0.10 part of aluminum sulfate and 0.05-0.10 part of N,N'-methylene bisacrylamide. The reinforcing function of humic acid and sepiolite is utilized, humic acid and sepiolite are evenly inserted into a three-dimensional network hydrogel material formed by methacrylic acid, polyethylene glycol and polyvinyl alcohol, and the hydrogel material with good adsorption efficiency on heavy metal ions, the large adsorption amount, a stable structure and excellent mechanical performance is formed. Production cost is reduced, meanwhile, the thermal decomposition temperature of the material is raised, the service life of the material is prolonged, and the hydrogel material is suitable for the sewage treatment technology. The invention further discloses a preparation method of the hydrogel material for treating the heavy metal containing sewage. The production process is simple, cost is low, safety and environment friendliness are achieved, and market application prospects are achieved.

The invention discloses a tooth powder which is characterized by comprising anti-staining active ingredient, acid-free desensitization ingredient, odour removal ingredient and base stock ingredient, wherein the anti-staining active ingredient comprises modified phytic acid sodium and urea hydrogen peroxide; the acid-free desensitization ingredient comprises sodium monofluorophosphate and Chinese medicine desensitization agent; the odour removal ingredient comprises angelica root extract and liex rotunda extract; and the base stock ingredient comprises dicalcium phosphate dehydrate, calcium carbonate, silica, soluble saccharin, glycerol, essence, sodium lauryl sulfate and the balance of preservative. When being in fabrication, the tooth powder not only has the functions of cleaning dental plaque, complexing and dissolving pigmentation of tooth surface but also can reduce the irritation to the oral cavity and the aching, limp and allergic feeding can not be caused during use process through a combination technology.

A method for detecting a divalent cadmium ion in an aquatic product by using an HPLC-ICP-MS (High Performance Liquid Chromatography-Inductively Coupled Plasma-Mass Spectrometer) coupling technique belongs to the technical field of detection of aquatic products. The method comprises the following steps: 1), selecting instruments and equipment as well as an HPLC-ICP-MS coupling system; 2), configuring reagents and a standard solution; 3), processing a sample; 4), creating conditions for the experiment instruments; and 5), detecting the sample and calculating the results. According to the method, the cadmium in the aquatic product is extracted by neutral water in an ultrasonic way and the state of the cadmium is not changed, so that the cadmium in a free ion state and the cadmium subjected to complexation with organic matters such as protein both exist in the extract solution. In the adopted mobile phase, oxalate exerts a strong complexation effect on the cadmium ions but does not adsorb and elute stable cadmium complex in the extract solution, so that the cadmium ions and the cadmium complex in the sample can be guaranteed to be better separated. The method for detecting the divalent cadmium ion in the aquatic product by using the HPLC-ICP-MS coupling technique fills a blank in national standard that only the cadmium detection method is provided but no method for detecting the state of cadmium element is provided, therefore, the quality safety of the aquatic product and products of the aquatic product can be accurately and scientifically evaluated, meanwhile, the method is of great significance for formulating a new standard on the limit of harmful elements in the aquatic product.