223 results about "Adsorption reaction" patented technology

The invention discloses a gas-sensitive material based on double noble metal doped holmium iron oxide and application of the gas-sensitive material to detection of hydrogen sulfide in a sulfur-containing ore body exploration environment, and relates to the technical field of gas-sensitive materials. HoFeO3 is used as a substrate material, and two elements of Au and Pt are used for doping modification of the HoFeO3 to prepare the gas sensitive material based on double noble metal doped holmium iron oxide. Au and Pt are combined to perform doping modification on HoFeO3, a synergistic effect is achieved on improving the temperature stability of the gas-sensitive material, the sensitivity of the gas-sensitive material in a high-humidity environment can be improved, in addition, due to the synergistic catalysis effect of Au and Pt, an energy barrier of H2S adsorption reaction can be remarkably reduced, surface electron transfer and reaction activity are promoted, and the sensitivity of the gas-sensitive material in a high-humidity environment is improved. Therefore, the working temperature is reduced, the response value is improved, and the method is suitable for detecting hydrogen sulfide gas in a sulfur ore body exploration environment.

The invention provides a carbon dioxide capture system based on a calcium-based granular material and a control method of the carbon dioxide capture system. The system comprises a reactor, a decomposition bin, a conveying branch and an input branch, the input branch inputs raw flue gas to the reactor; the conveying branch conveys a calcium-based particle material to the reactor by using the heated flue gas; the reactor is used for controlling the internal temperature by selecting the raw flue gas input by the input branch so as to control the adsorption reaction; the decomposition bin is used for controlling the movement of the supporting plate under the mechanical action and the air pressure action so as to guide the flowing of the materials and further control the desorption reaction. A set of complete and ingenious heat circulation process and material circulation process is constructed, the circulation processes are linked with each other, the structural design is ingenious and practical, and while efficient adsorption and desorption of carbon dioxide are guaranteed, the energy utilization efficiency is improved, the energy consumption is reduced, and the equipment maintenance cost and the energy purchase cost are reduced.

Adsorbent reactors for removing carbon dioxide (CO2) from the atmosphere with several types of sealing door valves, ranging from a single valve element to multiple valve elements, are provided. The sealing door valves are configured to open to allow gases into the reactor, such as allowing ambient air to enter during adsorption, and can close to seal the reactor, such as allowing vacuum conditions to be created inside the reactor and / or steam to be injected into the reactor during desorption. The valves are designed to create minimum resistance to valve motion, minimum obstruction to gas flow when open, minimum allowance of fluid passage when closed, and to minimize dead space within the reactor.

The invention relates to the technical field of radionuclide separation, in particular to an Eu (III) / An (III) separation method based on a zirconium phosphonate-based metal organic framework adsorbent, which comprises the following steps: adding the zirconium phosphonate-based metal organic framework adsorbent into an Eu (III) and / or An (III) nuclide-containing aqueous solution with the acid concentration of 0.001-3M to carry out adsorption reaction, and then carrying out solid-liquid separation, wherein the zirconium phosphonate-based metal organic framework adsorbent is a zirconium phosphonate-based metal organic framework material exchanged by metal cations M; the metal cation M is selected from one of alkali metal ions, alkaline earth metal ions or divalent transition metal ions. According to the invention, the interlayer chemical properties of the material are regulated and controlled through ion exchange, so that the adsorbent has ultrahigh selectivity, rapid adsorption kinetics, high adsorption capacity and excellent structural stability on trivalent actinide / simulated nuclides in extremely high-acid, high-salt and intense-radiation environments; the key problems of low separation efficiency and poor stability in a high-acid complex system in the prior art are solved, and the method is suitable for treating high-level liquid waste.

The invention belongs to the field of flue gas treatment, and provides a purification treatment system and method for lepidolite roasting flue gas. The purification treatment device comprises a pre-dedusting device, a first-stage moving bed reactor, a second-stage fluidized bed reactor, a third-stage dedusting reactor and an induced draft fan which are connected in sequence, wherein the pre-dedusting device is used for carrying out pre-dedusting treatment on roasting flue gas; the first-stage moving bed reactor is used for carrying out first-stage adsorption reaction treatment on pollutants in the pre-dedusted flue gas; the second-stage fluidized bed reactor is used for carrying out second-stage adsorption reaction treatment on pollutants in the flue gas-particle mixture I generated by the first-stage moving bed reactor; and the third-stage dust removal reactor is used for carrying out third-stage adsorption reaction and dust removal treatment on pollutants in the flue gas-particle mixture II generated by the second-stage fluidized bed reactor. According to the method, various pollutant components in the lepidolite roasting flue gas can be effectively removed, and secondary pollution problems such as waste water and chimney rain do not exist in the flue gas purification treatment process.

The invention aims to provide a method for preparing micron-sized zinc metastannate by wet recovery of tin and zinc in electronic wastes and a synthetic method of 4-hydroxy-1-indanone, and belongs to the technical field of metal recycling. According to the method, amino coordination and carboxylic acid chelation are utilized, tin and zinc in the electronic waste are selectively leached out under the mild acidic condition, impurity metals such as iron and copper are retained in residues due to the difference of complexing constants, and metal ion grade separation (selectivity gt and 99%) is achieved. And then, through evaporation-crystallization regulation and control, the Sn-Zn complex is directionally reconstructed into micron-sized zinc metastannate. In indanone synthesis, micron-sized zinc metastannate forms a local protonic acid environment by adsorbing trace moisture in a reaction system, synchronously activates a C = N bond (Lewis acid site catalysis) of an imine substrate and stabilizes a cyclization transition state (hydrogen bond guiding effect), so that the activation energy of [4 + 1] cycloaddition reaction is reduced, reaction equilibrium is driven to move towards a product end, and the yield of indanone is increased. And quantitative conversion of indanone under mild conditions (the yield is 60%) is realized.

The utility model discloses a helium dehydrogenation and purification device taking air as regenerated gas. The helium dehydrogenation and purification device comprises a catalytic dehydrogenation reactor, a first adsorption reactor and a second adsorption reactor, a refrigerant of the heat exchanger is connected with a feed gas source and a compressed air source, a refrigerant outlet of the heat exchanger is connected with an inlet of the catalytic dehydrogenation reactor, an outlet of the catalytic dehydrogenation reactor is connected with a heating medium inlet of the heat exchanger, and a heating medium outlet of the heat exchanger is connected with an inlet of the steam-water separator; inlets of the first adsorption reactor and the second adsorption reactor are connected with an outlet of the steam-water separator and a regenerated waste gas outlet; outlets of the first adsorption reactor and the second adsorption reactor are connected with a product gas outlet and a compressed air source; a hydrogen analyzer and a flow meter are arranged on a pipeline for connecting a refrigerant inlet of the heat exchanger with the feed gas source, and a flow controller and a flow control valve are arranged on a pipeline for connecting the refrigerant inlet of the heat exchanger with the compressed air source; the flow controller is electrically connected with the hydrogen analyzer and the flow meter and can control the opening degree of the flow control valve. The problem that hydrogen-containing gas cannot be provided as regeneration gas in most helium catalytic dehydrogenation purification scenes is solved.

The invention relates to a method for extracting lithium from a lithium-containing sodium aluminate solution and preparing lithium carbonate, and belongs to the technical field of lithium recovery. The method comprises the following steps: adding an extracting agent into a lithium-containing sodium aluminate solution, and carrying out extraction reaction to obtain a lithium-removed sodium aluminate solution and a lithium-rich extracting solution; carrying out reverse extraction on the lithium-rich extraction liquid by taking water as a reverse extraction agent to obtain a lithium-containing solution; adding activated aluminum oxide into the lithium-containing solution, and carrying out adsorption reaction to obtain solid-phase aluminum oxide; eluting the solid-phase aluminum oxide with acid to obtain a lithium-rich solution; and adding a carbon source into the lithium-rich solution, and sequentially precipitating, separating and washing to obtain lithium carbonate. According to the method, a complex impurity removal process does not need to be carried out on the lithium-containing sodium aluminate solution, the high-concentration lithium salt solution is obtained after the lithium ions are directly extracted from the lithium-containing sodium aluminate solution and then are subjected to reverse extraction, adsorption and desorption, and industrial-grade lithium carbonate can be obtained by supplementing a carbon source, so that the preparation cost of the lithium carbonate is greatly reduced. The method has the advantages of good selectivity, high recovery rate, cyclic continuous production, economy and environmental protection.

The present invention discloses a method for removing impurities from waste acid and fully recycling the waste acid. The method comprises the following steps: introducing hydrogen sulfide into the waste acid for a sulfidation reaction, removing arsenic sulfide and mercuric sulfide precipitates formed during the reaction; continuing to introduce hydrogen sulfide for a step-by-step sulfidation reaction, adding an iron-containing substance to adjust the reaction pH and ORP, and recovering the copper, lead, and zinc sulfide slag precipitates formed during the reaction in a step-by-step manner; adding an iron-containing substance for a neutralization reaction, controlling the pH and ORP, promoting the reaction between iron ions and arsenate, and removing the ferric arsenate precipitate formed during the reaction; adding an adsorbent for an adsorption reaction, and removing fluorine-containing and thallium-containing components by adsorption; introducing an oxidant for an oxidative hydrolysis reaction, controlling the degree of hydrolysis, and preparing polyferric sulfate. The present invention utilizes the iron-containing substance to remove impurities from waste acid, thereby achieving deep impurity removal and full resource utilization of waste acid.

The invention discloses a self-weight configuration oxygen evolution electrode and a preparation method and application thereof.The preparation method comprises the steps that a nickel substrate serving as a working electrode, a platinum sheet serving as a counter electrode and a saturated calomel electrode serving as a reference electrode are placed in a NiCo2O4 precursor solution, constant-potential electro-deposition is conducted on the nickel substrate, and a precursor electrode with a Ni-Co LDH precursor on the surface is obtained; putting the precursor electrode into a heating device for heating and heat preservation, and then taking out the precursor electrode for cooling to obtain a NiCo2O4 electrode with a spinel structure; and sequentially putting the NiCo2O4 electrode into a ferric nitrate nonahydrate aqueous solution and a sodium hydroxide solution, and loading alpha-Fe2O3 nanoparticles on the surface of the NiCo2O4 electrode by using a continuous ion layer adsorption reaction method to obtain the self-weight configuration oxygen evolution electrode. According to the preparation method of the self-weight configuration oxygen evolution electrode, a composite catalyst layer composed of NiCo2O4 and alpha-Fe2O3 of a spinel structure is constructed on a nickel substrate, and the self-weight configuration oxygen evolution electrode can adapt to power fluctuation.

The invention discloses a method for promoting formation of a sandy soil mineral organic complex by utilizing fungal secretions, and relates to the technical field of soil improvement and ecological restoration, and the method comprises the following steps: firstly, screening fungal strains to prepare a high-activity fungal inoculant; then preparing a mineral activation inducer containing low-molecular organic acid, trace elements and a biological surfactant; then mixing a high-activity fungal inoculant with a mineral activation inducer, and applying the mixture into the target sandy soil layer; finally, regulating and controlling the condition of the sandy soil layer after bacterium application, and maintaining for a preset time to promote in-situ reaction of fungi and sandy soil minerals to form a stable mineral-organic complex; according to the method, organic acid secreted by fungi can be promoted to be subjected to complexation and adsorption reaction with minerals such as silicate and iron-aluminum oxide in the sandy soil in a short time, meanwhile, fungal hyphae and secreted polysaccharide have physical bridging and wrapping effects, a stable mineral-organic complex is formed in situ, and the stability of the sandy soil is fundamentally improved.

The invention discloses a flue gas carbon dioxide continuous capturing system and method based on solid amine, and the system comprises a flue gas inlet pipeline used for introducing original flue gas; the adsorption reactor is used for adsorbing carbon dioxide in the original flue gas; the bottom of the adsorption reactor is provided with a flue gas and adsorbent inlet, and the flue gas and adsorbent inlet is connected with the flue gas inlet pipeline; the dust remover is connected with the adsorption reactor and is used for carrying out gas-solid separation and discharging decarbonized flue gas; the buffering bin is connected with the dust remover and is used for buffering the solid amine adsorbent; the desorption device is connected with the surge bin and is used for desorbing carbon dioxide in the solid amine adsorbent; and a discharge hole of the desorption device is connected with the flue gas inlet pipeline. The solid amine adsorbent realizes closed and continuous circulation in the system and the method, and high-efficiency and low-energy-consumption capture of carbon dioxide in flue gas is completed.

The present application belongs to the technical field of water treatment, and relates to a heat-sensitive color developing agent F-103 production wastewater treatment method. The present application performs multistage treatment on the wastewater. First, an alkaline chemical separation reaction is performed on the wastewater to remove part of the acidic polar organic matter 3-p-tolylsulfonylureido phenol, p-toluenesulfonic acid and the like in the water. Then, an acid chemical separation reaction is performed to further remove the alkaline polar organic matter intermediate MAPOTs and the like in the water. Subsequently, an adsorption reaction is performed using activated carbon to further remove the organic matter and inorganic impurities in the water. Finally, evaporation and concentration are performed to recover the salt sodium chloride. The wastewater treatment of the present application recovers the salt sodium chloride in the wastewater as a resource under the premise of solving the toxicity problem of the organic matter in the wastewater, and realizes the harmless treatment and the reduction of hazardous waste of the wastewater.

The application discloses a preparation method of a modified anti-polymerization adsorbent for styrene adsorption, and comprises the following steps: (1) mixing a molecular sieve carrier with ammonia water, uniformly stirring, and obtaining an ammonia modified molecular sieve carrier through post-treatment I; (2) mixing the ammonia modified molecular sieve carrier, a metal precursor and deionized water, and obtaining the modified anti-polymerization adsorbent through impregnation treatment, post-treatment II and calcination treatment. When the modified adsorbent prepared by the method is used in a VOCs adsorption reaction in rubber chemical industry flue gas, the styrene in the VOCs has the characteristics of large adsorption capacity and strong anti-styrene polymerization capacity.

This invention discloses a method for hydrotreating catalytic cracking slurry. A fixed-bed hydrotreating process is employed, comprising: in the presence of hydrogen, the catalytic cracking slurry sequentially contacts a hydrotreating protectant, a hydrotreating transition catalyst, and a hydrodesulfurization catalyst to undergo a hydrotreating reaction, yielding hydrotreated oil. The hydrotreating protectant comprises an alumina support with a most probable pore size of 40–100 nm, molybdenum oxide, and cobalt oxide. The hydrotreating transition catalyst comprises an alumina support containing additives and MoO3 and CoO. The support has a bimodal pore size distribution, with smaller pores concentrated in the 10–40 nm range and larger pores concentrated in the 150–400 nm range. This method eliminates the diffusion resistance during the adsorption and reaction of large molecules on the catalyst surface during the hydrotreating of catalytic cracking slurry, increases the capacity for more deposits such as coke, extends the operating cycle of the unit, and facilitates hydrodesulfurization and other reactions. It also increases the content of tricyclic and tetracyclic aromatics in the hydrotreated oil, making it a high-quality feedstock for needle coke production.

The present application relates to the field of chemical synthetic materials and catalysis, and particularly relates to a metal-amorphous structure chalcogenide core-shell nanocrystal and a preparation method and application thereof.The preparation method comprises the following steps: (1) synthesizing Au nanorods through a seed growth method; (2) coating silver on the surface of the Au, and epitaxially growing a silver shell layer nanocrystal; and (3) sulfidizing the silver shell layer nanocrystal, and performing hydrothermal cation exchange to obtain a core-shell structure nanocrystal.In the metal-amorphous structure chalcogenide core-shell nanocrystal, the amorphous surface to a certain extent is conducive to adsorbing reaction substrates, and promotes the progress of the photocatalytic carbon dioxide reduction reaction.The metal-amorphous structure chalcogenide core-shell nanocrystal has excellent gas-solid phase photocatalytic carbon dioxide reduction performance, and can achieve good effects without a photosensitizer and a sacrificial agent.

The invention relates to the technical field of gas purification, and discloses a gas adsorbent regeneration method which comprises the following steps: feeding a to-be-regenerated gas adsorbent into a regenerator, and vacuumizing the regenerator; performing three-stage treatment on the to-be-regenerated adsorbent subjected to vacuum-pumping treatment to obtain a regenerated adsorbent; and sending the regenerated adsorbent to a gas adsorber for adsorption reaction. Through cooperation of vacuumizing pretreatment and three-section treatment, efficient regeneration of various adsorbents is achieved, energy consumption is reduced, secondary pollution is avoided, and the cyclic utilization rate of the adsorbents is increased.

The invention discloses modified biochar as well as a preparation method and application thereof. The modified biochar comprises biochar and a calcium-containing compound, wherein the calcium-containing compound is loaded on the biochar, the loading amount of the calcium-containing compound is 10-30% of the mass of the modified biochar, and the calcium-containing compound is at least one of CaO and Ca (OH) 2. According to the invention, the biogas residue is modified by calcium carbonate, so that mesoporous of the biochar in a 4-10nm section is filled. The modified biochar promotes the retention of oxygen-containing functional groups of O-C = O and C = O on the surface, and the modified biochar prepared by the invention still can keep better strength. The invention also provides a method for treating phosphorus-containing wastewater by using the modified biochar and a device for treating phosphorus-containing wastewater, the intermittent adsorption reaction of the biochar shows that the adsorption performance of the modified biochar is superior to that of unmodified biochar, the saturated adsorption capacity of the modified biochar is 18-20 mg-P / g-BC, and the modified biochar is suitable for being applied to a sewage treatment plant.

The application discloses a method and system for recovering carbon dioxide in flue gas, belonging to the field of recovering carbon dioxide in flue gas. After high-temperature flue gas is filtered, heat is released for the first time, and then after desulfurization and denitrification, heat is released for the second time. Finally, low-temperature flue gas is formed and is subjected to an adsorption reaction with solid amine particles. The solid amine particles, after absorbing carbon dioxide, are subjected to heat absorption and temperature rise for two times, and then are directly heated by high-temperature water vapor. After the solid amine particles, after carbon dioxide is separated, are cooled, the solid amine particles participate in the reaction again. The flue gas is subjected to heat exchange and temperature reduction for two times, so that the temperature of the flue gas is reduced, the flue gas is better adsorbed by the solid amine particles, and the heat released by the flue gas during temperature reduction is used for preheating the solid amine particles, which have adsorbed carbon dioxide, and gradually increasing the temperature of the solid amine particles, so that the use amount of steam is further reduced when the steam is used for heating.

The application discloses a method for determining a silicate cement hydration performance index, comprising the following steps: 1) respectively establishing mathematical relational expressions of mineral phase dissolution, hydration product deposition, ion adsorption reaction rate and ion concentration; 2) establishing chemical field control equations of mineral phase dissolution, product deposition, ion diffusion and ion adsorption reaction coupling in the hydration process, and potential field and temperature field control equations; combining corresponding boundary and initial conditions, solving the three groups of control equations, and outputting the results of ion concentration, potential and temperature changes with time and spatial distribution in the whole hydration process; and 3) establishing a hydration heat calculation formula of the whole hydration process of the silicate cement. The application further discloses an analysis device. The method is more in line with the real situation of the silicate cement hydration, more accurately describes the cement hydration process from the essential mechanism, can completely, accurately and truly reflect the silicate cement hydration process, and has important research and popularization significance.

The present invention discloses a solid adsorption cycle carbon capture device and method, the device performs carbon capture through an alkali metal-based solid absorbent, and the device at least comprises: a fluidized reactor having a hydration reaction zone and an adsorption reaction zone which are relatively isolated; a hydration bed layer is arranged at the bottom of the hydration reaction area, and water vapor introduced from the bottom of the hydration bed layer is subjected to fluidized hydration reaction; an adsorption bed layer is arranged at the bottom of the adsorption reaction area, and a fluidized adsorption reaction is carried out through carbon-containing gas introduced from the bottom of the adsorption bed layer; the hydration bed layer is communicated with the adsorption bed layer through a vertical pipe; and a hydrated adsorbent particle dense-phase region is arranged in the vertical pipe and is used for isolating the hydration reaction region from the adsorption reaction region. According to the scheme of partition reaction, the contradiction that the reaction rates between hydration and carbonation are not matched is fundamentally solved, the performance of the adsorbent can be exerted to the maximum extent, and the treatment efficiency of carbon capture is effectively improved; the hydration reaction and the adsorption reaction can be subjected to process reinforcement through the fluidized reactor, so that the efficiency of the hydration reaction and the adsorption reaction is effectively improved.

The invention relates to the technical field of industrial wastewater denitrification, in particular to an industrial wastewater deep denitrification method based on a graphene adsorption material, which comprises the following steps: introducing industrial wastewater containing total nitrogen into an adsorption reaction unit; ammonia nitrogen and nitrate nitrogen in the wastewater are removed by adjusting the empty bed contact time; when the adsorption material is saturated, the particles are regenerated, and regenerated liquid is collected for nitrogen resource utilization. According to the core-shell type dual-functional graphene adsorption particle, rich amino functional groups on a PEI chain of the core of the core-shell type dual-functional graphene adsorption particle can efficiently and specifically adsorb and remove ammonia nitrogen through the ion exchange effect, the shell of the core-shell type dual-functional graphene adsorption particle is composed of magnesium-aluminum hydrotalcite growing in situ, exchangeable anions between hydrotalcite laminates can be subjected to ion exchange with nitrate nitrogen, and therefore the ammonia nitrogen can be removed through the core-shell type dual-functional graphene adsorption particle. Selective adsorption of nitrate nitrogen is realized; the synchronous deep removal of ammonia nitrogen and nitrate nitrogen in industrial wastewater is realized, the treatment efficiency is greatly improved, and the process flow is simplified.

This invention discloses a resource recovery system for dredged sediment treatment based on ultrasonic extraction and flotation synergy, comprising: a pretreatment unit, a first-stage ultrasonic extraction reaction unit, a second-stage solid-phase adsorption reaction unit, a third-stage flotation separation unit, a dewatering unit, a residual water treatment unit, and a nitrogen and phosphorus recovery unit. It also discloses a resource recovery method for dredged sediment treatment based on ultrasonic extraction and flotation synergy. This invention solves the problems of low pollutant removal rate, high risk of secondary pollution of dredged soil, and limited resource recovery in traditional dredged sediment treatment. Through the synergistic effect of multiple units including "ultrasonic-liquid-solid-phase adsorption-micro-nano bubble flotation," it achieves efficient release of nitrogen and phosphorus, simultaneous removal of microplastics, rapid separation of clean sediment from polluted phases, and recovery of nitrogen and phosphorus for fertilizer production and resource recovery of clean sediment. The entire process is green and low-consumption, suitable for compact layout on water or near shore, and can simultaneously meet the requirements of sediment reduction, harmlessness, and resource recovery.

The invention relates to a conveying device, in particular to a carbon powder conveying device and method for aluminum carbon flue gas treatment. Comprising a carbon powder adsorption reactor, wherein an arch breaking device is arranged below the carbon powder adsorption reactor; wherein the carbon powder adsorption reactor structurally comprises a shell, a material mixing and arch breaking cone is arranged at the center in a cavity of the shell, the material mixing and arch breaking cone is fixed by a supporting piece, a feeding pipe inserted into the cavity of the shell is arranged at the lower part of the shell, and the bottom of the shell is connected with a throat; the arch breaking device is structurally characterized in that a reamer is arranged at the bottom in a cavity of the ash bucket and fixed on a reamer shaft, two ends of the reamer shaft respectively penetrate through the wall of the ash bucket, one end of the reamer shaft is connected with a motor driving device, and the other end of the reamer shaft is connected with a shaft seat. The equipment is convenient to overhaul and maintain. And the carbon powder conveying process is short, the contact between the carbon powder and the external environment, especially low-temperature gas, is small, and the carbon powder hardening probability is fundamentally reduced.

The invention belongs to the technical field of building materials, and particularly relates to a phosphogypsum-based cementing material additive based on an organic-inorganic composite oriented crystallization network, a cementing material and application. The porous adsorption-reaction agent, the superfine calcium sulfate whisker, the composite thickening time control agent, the organic polymer network agent, the interface reinforcing agent, the active filler and other components are used together, and a traditional alkaline excitation route is avoided through directional crystallization and an organic-inorganic composite network; the composite network obviously improves the mechanical property of the material and increases the softening coefficient; in addition, resource utilization of a large amount of industrial solid waste is achieved, energy is saved, carbon is reduced, the green sustainable development strategy is met, and an economical and feasible solution is provided for high-value and large-scale utilization of phosphogypsum.

The invention belongs to the technical field of precious metal resource recovery, and discloses a light-assisted method for recovering gold from a solution containing monovalent gold ions, which comprises the following steps: S1, mixing the solution containing monovalent gold ions with an adsorbent, and fully stirring under the illumination condition of ultraviolet light with the wavelength of 225-380nm and the intensity of 1-100W / m < 2 > until the adsorption reaction is finished; s2, performing ultrasonic treatment and centrifugation on the reactants to obtain dispersion liquid of the elemental gold and the adsorbent; and S3, the dispersion liquid of the adsorbent is repeatedly utilized, and the gold elementary substance solid is recycled. Wherein the adsorbent is a polymer and a derivative of dopamine, polydopamine, melanin and melanin-like. The method has ultrahigh adsorption capacity and selectivity on gold ions, and is simple and convenient in process, good in material reusability and beneficial to large-scale preparation.

The invention discloses a method for detecting the content of free carbon in a tungsten-titanium solid solution, and belongs to the field of analytical chemistry. According to the method, based on the adsorption effect of the free carbon on bromothymol blue, an adsorption reaction is carried out in an acidic buffer system, and selective adsorption of the free carbon is realized; and then carrying out solid-liquid separation, alkalifying the filtrate, measuring the absorbance under the wavelength of 574nm, and calculating the content of free carbon by using a standard curve method according to the absorbance difference. The method has the advantages of simplicity and convenience in operation, low cost, no use of strong corrosive acid, environmental friendliness and the like. Compared with a high-frequency infrared method, the precision is remarkably improved, and the method is suitable for rapid and accurate determination of free carbon in the tungsten-titanium solid solution.

The present application belongs to the technical field of water pollutant removal, and particularly relates to a water microplastic efficient removal and green catalytic degradation method. The water microplastic efficient removal and green catalytic degradation method comprises the following steps: preparing a lignin carbon-based magnetic adsorption material; adding the lignin carbon-based magnetic adsorption material to a polluted water body containing microplastics to perform an adsorption reaction; under an inert atmosphere, performing thermal degradation on the lignin carbon-based magnetic adsorption material adsorbing the microplastics to realize in-situ catalytic degradation and recovery of the microplastics and regeneration of the lignin carbon-based magnetic adsorption material. In the in-situ catalytic thermal degradation process of the microplastics, the biochar plays a role of an in-situ catalyst, can promote the in-situ catalytic thermal degradation of the microplastics, generates high-value hydrocarbon byproducts, realizes green thermal degradation and reuse of the microplastics, and regenerates the carbon-based adsorption material.

The application provides a synthesis method of 9,10-dibromoanthracene, by introducing HBr generated by a solvent water adsorption reaction, using an industrial sodium hypochlorite solution to react the HBr into bromine, ensuring high concentration of bromine, introducing a solvent dichloroethane to uniformly disperse raw materials, keeping the concentration of bromine stable in the reaction, greatly promoting the reaction speed, greatly shortening the reaction time, and converting the sodium hypochlorite into a sodium chloride aqueous solution after the reaction is completed. The purity of the prepared 9,10-dibromoanthracene is more than 99%, and the by-products generated in the reaction are environment-friendly and non-polluting.

The invention discloses a production process of N-acetylglucosamine, and belongs to the technical field of N-acetylglucosamine production. Methanol is used as a solvent, glucosamine hydrochloride and acetic anhydride are used as raw materials, sodium hydroxide is added as a catalyst, other toxic chemical substances are not introduced, and meanwhile, the product yield is increased. In addition, in the product purification treatment process, a specific fixing agent is added, the specific fixing agent is a magnetic nanoparticle immobilized phenylboronic acid derivative, and the phenylboronic acid derivative can recognize and combine D-glucosamine with cis-dihydroxyl and cannot react with N-acetylglucosamine; the D-glucosamine in the N-acetylglucosamine can be effectively and selectively removed; and after the magnetic nanoparticles are immobilized, the selective adsorption reaction can be amplified, the separation and removal are facilitated, and the operation steps are simplified.