37results about How to "Achieve selective removal" patented technology

The invention discloses a method for preferably removing arsenic in lead and antimony smoke. The method comprises the following steps that firstly, sulphur and the lead and antimony smoke are mixed according to the mass ratio of 0.01-0.5:1, then the mixture is added into a sodium hydroxide solution to be leached, and meanwhile the temperature of the solution is kept within the range from 50 DEG C to 100 DEG C; secondly, liquid and solid separation is carried out on the solution leached in the first step, and a leaching agent and leaching residues are obtained; the leaching residues are washed, washing water obtained after washing is completed and the leaching agent are mixed and cooled to the room temperature, and filtering is carried out to obtain sodium arsenate crystal and crystalline liquid; and the crystalline liquid is used for leaching of the lead and antimony smoke in the first step. According to the technology method, the loss of valuable metal such as lead, antimony and zinc in the arsenic leaching and removing process is reduced through the adding of sulphur, meanwhile, the arsenic removing rate is increased, and selective removing of arsenic is achieved. The leaching rate of arsenic can reach 99% or more, and the content of arsenic in the leached residues can be reduced to 0.1% or lower.

The invention discloses a preparation method of a zirconium-based metal-organic complex UiO-66/foam carbon composite material. According to the preparation method, ZrCl4 is utilized as a metal source,terephthalic acid is utilized as ligand, foam carbon is added, and one-step hydrothermal synthesis is utilized. The preparation method specifically comprises the following operation steps: (1) cutting tripolycyanamide sponge into blocks, putting into an N2 atmosphere tubular furnace to be calcined and utilizing nitric acid to acidify the sponge to obtain foam carbon; (2) adding ZrCl4 and he terephthalic acid into N,N-dimethyl formamide, then adding glacial acetic acid to be stirred, then adding the foam carbon of 10% of the mass of ZrCl4 and performing ultrasonic mixing treatment; then putting a mixed solution into a reaction kettle to be reacted, cooling to the room temperature, cleaning a reaction product and vacuum drying to obtain the zirconium-based metal-organic complex UiO-66/foamcarbon composite material. The composite material prepared by the preparation method disclosed by the invention can quickly, efficiently and selectively remove fluorine ions in a water body and further is convenient to separate and recycle.

The invention belongs to the technical field of superparamagnetism functional materials, and discloses a Cu2+-EDTA-Fe3O4 magnetic grain with the surface decorated with a large number of copper ions, a preparation method of the Cu2+-EDTA-Fe3O4 magnetic grain, and application of the Cu2+-EDTA-Fe3O4 magnetic grain in the bio-medical field. The Cu2+-EDTA-Fe3O4 magnetic grain is particularly suitable for separating histidine proteins. The magnetic grain is prepared through the following steps of preparing an EDTA-Fe3O4 magnetic grain through a hydrothermal method, adding the EDTA-Fe3O4 magnetic grain to a water-soluble copper salt solution, and obtaining the Cu2+-EDTA-Fe3O4 magnetic grain through chelation. The magnetic grain is spherical and high in dispersibility and has the grain size of about 150 nm and the magnetic saturation of 69 emu/g. Through the strong coordination of Cu2+ with which the surface of the grain is decorated and histidine residues on surfaces of hemoglobin, the superhigh adsorption capacity is achieved for hemoglobin, the adsorption capacity can reach 1250 mg/g, no obvious adsorption effect is achieved for serum albumin, excellent selectivity is expressed, and the removal efficiency is larger than 90%.

The invention belongs to the technical field of synthesis of an environment material and specifically relates to a preparation method of conductive imprinting Ag@PANI/CoFe2O4/C with high photocatalytic activity and selectivity. The preparation method comprises the following steps: taking corncob converted C as a carrier, loading CoFe2O4 to synthesize CoFe2O4/C, synthesizing PANI, loading Ag, synthesizing Ag@PANI, taking tetracycline as a template molecule and synthesizing a final material. The preparation method has the following advantages: an imprinting layer adopts a step-by-step grafting and visible light initiation method, has the advantages of high bonding success rate and high polymerization speed as well as realizes selective removal of the tetracycline; the Ag@PANI adopts an external synthesis and integral introduction method, has the advantages of controllable proportion, storage integrity and high photocatalytic property and improves both photocatalytic activity and selectivity; due to the use of waste biomass (corncob), the significance of treating waste with waste is embodied and the production cost is reduced.

The invention discloses a method for continuously removing chlorine and nitrate in an extracting solution of tobacco. The method is characterized in that a ceramic film device and an electrodialysis device are combined to remove chlorine and nitrate in the extracting solution of tobacco, and chemical components in reconstituted tobacco are separated. The method comprises specific steps as follows: the extracting solution of tobacco is introduced into the ceramic film device for circulating filtration, obtained dialysate continuously enters a thinning chamber of the electrodialysis device to circulate and is subjected to electrodialysis, and chlorine and nitrate in the dialysate are removed. After the extracting solution of the tobacco is treated with the method, the removal rate of chlorine ions is higher than 95%, the removal rate of nitrate is higher than 90%, and the yield is larger than 78%.

The invention discloses a compound of lanthanum molybdate and ferromagnetic materials and application of preparation and adsorption phosphorus removal, belonging to the technical field of phosphorus removal from sewage and wastewater. The preparation method of the composite comprises the following steps of: dispersing ferromagnetic materials in water, adding lanthanum salt, fully mixing, adding ammonium molybdate, sodium molybdate or potassium molybdate, adjusting the pH to 8-10, and performing coprecipitation reaction to obtain lanthanum molybdate. The reaction system is placed in a reactionkettle and reacts under the condition of 180 DEG C or more to obtain a composite of lanthanum molybdate and ferromagnetic materials. According to the composite disclosed by the invention, the selective adsorption function of lanthanum molybdate on phosphate radicals is utilized, and the superparamagnetism of ferromagnetic ore is utilized at the same time, so that the adsorbent can be separated andregenerated under the condition of an external magnetic field after phosphorus is adsorbed and removed in sewage, and the effect of recycling the adsorbent is realized.

The invention relates to a preparation method of high-purity 1-methylnaphthalene. The preparation method comprises the steps that (a) technical methylnaphthalene fraction is added to an acid solution for acid pickling, and standing layering is performed to obtain a first organic layer; (b) the first organic layer is added to an alkaline solution for alkaline washing, and standing layering is performed to obtain a second organic layer; (c) ethanethiol, metal halide and a catalyst are added to the second organic layer for reflux reaction; the mass ratio of the second organic layer, the ethanethiol, the metal halide and the catalyst is 100:(80-150):(1-5):(0.5-2); the catalyst is a mixture of copper oxide and aluminium trioxide, and the mass ratio of the copper oxide and the aluminium trioxide is 1:(1-3); (d) the product of the step (3) is filtered and rectified so that the high-purity 1-methylnaphthalene is obtained. Accordingly, 2-methylnaphthalene can be selectively removed, and the purity of the 1-methylnaphthalene is improved greatly.

The invention discloses a patterned wafer polishing method and a polishing solution suitable for polishing a ruthenium barrier layer in the patterned wafer. The polishing method comprises that (1) a first polishing solution used to carry out primary and second polishing on a metal layer successively; and (2) a second polishing solution is used to carry out tertiary polishing on the ruthenium barrier layer to obtain a polished patterned wafer. The polishing method can be used to carry out chemico-mechanical polishing on the patterned wafer with the ruthenium barrier layer interconnection structure, materials can be removed from the metal layer, ruthenium barrier layer and dielectric layer of the wafer selectively, high surface and interface quality can be achieved after polishing, and the polished wafer is globally and locally flatter and has lower surface defects.

The invention relates to the technical field of innocent treatment of antibiotic mushroom dregs, in particular to an innocent treatment method of antibiotic mushroom dregs. The innocent treatment method comprises the following steps: by taking persulfate as an oxidizing agent and copper powder as an activating agent, and carrying out ultrasonic oxidation treatment under an ultraviolet condition to realize the innocent treatment of the antibiotic mushroom dregs. According to the innocent treatment method, through combination of ultraviolet and ultrasonic treatment and oxidation treatment, resistance genes in the antibiotic mushroom dregs are reduced while antibiotic residues in the antibiotic mushroom dregs are efficiently removed, and the problem of secondary pollution caused by recycling of the antibiotic mushroom dregs is solved. The method is simple and efficient, does not need excessive chemical reagents and harsh conditions, does not generate secondary pollution, and is clean and sustainable technology. Experiments prove that the antibiotic residues in the innocent antibiotic mushroom dregs treated by the method is less than 1mg/kg, the antibiotic removal efficiency can be 99.99% within 40 minutes, and the resistance gene removal rate is greater than 6log.

The invention relates to a multistage combined flocculation device and a process for selectively removing aconitine type toxic ingredients from traditional Chinese medicine processing wastewater by using the same. The device comprises adjusting tanks and flocculation sedimentation tanks which are connected with one another in sequence, wherein a stirrer is arranged in each of the adjusting tanks and the flocculation sedimentation tanks. The device also comprises a hydrochloric acid storage tank, a sodium polyacrylate storage tank, a sodium hydroxide storage tank, a polyacrylamide storage tank, a polyaluminum chloride storage tank and a polymeric ferric sulfate storage tank which are connected with every adjusting tank or flocculation sedimentation tank. The process provided by the invention is particularly suitable for treating alkaloid in processing wastewater of aconite type traditional Chinese medicines including common monkshood mother root, kusnezoff monkshood root and the like, and can be used for realizing selective removal of alkaloids including hypaconitine, mesaconine, benzoyl mesaconine, benzoyl aconine, aconitine and the like; and moreover, a flocculant is easy to obtain and low in price, a constructed substance is small in volume, the cost is saved, the processing cycle is short, the operation is simple and convenient, the effect is obvious, and the stability is strong.

The invention discloses a method for removing residual acids in a biosaccharide preparation technique by electrodialysis. The method is characterized in that residual inorganic acids in the biosaccharide hydrolysate are removed by an electrodialysis process. The method comprises the following steps: hydrolyzing agricultural plant chopped fiber waste under the action of dilute acids to obtain the biosaccharide hydrolysate, and adding the hydrolysate into a desalination chamber internal circulation of an electrodialysis plant to carry out electrodialysis, thereby removing the residual acids, wherein the operation temperature is controlled at 35 DEG C or below, and the operating current density is 10-40mA/cm<2>. The method ensures the high yield of the product on the premise of effectively removing residual acids in the biosaccharide hydrolysate, and is a clean, efficient, green and environment-friendly technique.

The invention belongs to the technical field of antibiotic treatment, and particularly discloses a method for treating rifamycin residues in mushroom dregs through ultrasonic-alkali heat combination, which comprises the following steps: adjusting water content: weighing quantitative rifamycin mushroom dregs, adding deionized water, and adjusting the water content of the mushroom dregs to 95%; alkali liquor treatment: adding 4M NaOH into the mushroom dregs, uniformly stirring, and adjusting the pH value of the mushroom dregs to 8-12; carrying out hydrothermal ultrasonic treatment, namely putting the alkaline mushroom dregs into a constant-temperature water bath at 80-100 DEG C, and carrying out ultrasonic treatment for 10-120 minutes. The method disclosed by the invention is simple and efficient, does not need excessive chemical reagents and harsh conditions, does not generate secondary pollution, is a clean and sustainable technology, and is beneficial for realizing the purposes of turning waste into wealth and recycling a compost finished product as an organic fertilizer by virtue of a composting process after batch treatment is promoted, and finally realizing the purposes of reduction and recycling.

Provided is a slender hole deburring method based on tip-effect-induced pyrite reaction. The slender hole deburring method includes the steps that elemental sulfur is firstly poured into the bottom ofa slender hole, then an exhaust gas collecting device is installed on the slender hole, then a whole part is energized, and the characteristics of minimum sectional area of burrs and maximum value ofresistance are used for increasing the temperature of the burrs and inducing the pyrite reaction, so that the burr in the slender hole can be removed. According to the slender hole deburring method,burrs of complex structural parts such as a complex cavity, a penetrating and crossing hole system, a deep hole, and a blind hole has high adaptivity, and the burrs of different positions of parts canbe removed at the same time, not only the burrs are removed completely but also the efficiency is high.

The invention provides a preparation method of a solar cell and the solar cell, and belongs to the technical field of storage batteries, and the method comprises the steps: preparing a first tunneling silicon oxide layer and a boron in-situ doped amorphous silicon layer on the backlight surface of an N-type silicon wafer, removing the redundant first tunneling silicon oxide layer, the boron in-situ doped amorphous silicon layer and the boron-doped silicon oxide layer through laser etching so as to form a plurality of boron-doped amorphous silicon layers arranged at intervals on the backlight surface of the N-type silicon wafer; preparing a phosphorus-doped amorphous silicon layer between the adjacent boron-doped amorphous silicon layers, and forming a boron-phosphorus co-doped layer between the boron-doped amorphous silicon layer and the phosphorus-doped amorphous silicon layer; through a chemical cleaning mode, a phosphorus-doped region and a boron-doped region which are distributed in a comb-shaped crossed manner are formed on the backlight surface of the N-type silicon wafer, and an insulating region is formed between the phosphorus-doped region and the boron-doped region. According to the preparation method of the solar cell and the solar cell provided by the invention, the preparation process steps of the back field and the back emitter of the back contact cell are greatly simplified, and the cell cost is reduced.