5063 results about "Sorbent" patented technology

Described are storage and dispensing systems and related methods, for the storage and selective dispensing germane a reagent gas from a vessel in which the reagent gas is held in sorptive relationship to a solid adsorbent medium at an interior of a storage vessel and wherein the methods and dispensing systems provide dispensing of the reagent gas from the storage vessel with a reduced level of atmospheric impurities contained in the dispensed reagent gas.

The invention relates to the technical field of low-temperature adsorption and isotope separation, in particular to a low-temperature helium isotope adsorption separation system and a low-temperature helium isotope adsorption separation method, and the system comprises a gas distribution and gas recovery module which is used for preparing and mixing helium isotope raw material gas and recovering residual gas after an experiment; the static testing unit is used for testing the performance of the adsorbent under a fixed condition; the dynamic low-temperature adsorption unit is used for helium isotope separation under a continuous flow condition; the low-temperature control module is used for providing a stable low-temperature environment and accurate temperature control; wherein an air inlet pipe and an air outlet pipe of the low-temperature control module are respectively subjected to thermal sedimentation and are respectively connected with a flow controller. According to the scheme, the defects that in the prior art, He resources are seriously short, and existing low-temperature adsorption separation helium isotope examples are few are overcome, reference is provided for low-temperature adsorption separation helium isotope adsorbent screening and system design, development of the He separation and purification technology in China is promoted, and dependence on imported He is reduced.

Described herein are sorbents functionalized with polyamines having oxygen-containing units selected from carbonyl units, hydroxyl units, and combinations thereof, methods of making same, and methods of using same.

The invention discloses a magnetic biochar composite adsorbent as well as a preparation method and water treatment application thereof, and relates to the technical field of adsorption materials. The preparation method consists of a biochar matrix and magnetic particles loaded on the surface and in pores of the biochar matrix, and comprises the following steps: preparation of the biochar matrix: step 1, firstly, selecting a biomass raw material; the magnetic charcoal composite adsorbent has unique structure and performance advantages, abundant pore structures and surface functional groups of the adsorbent can provide a large number of adsorption sites for pollutants, and due to the existence of magnetic particles, after the adsorption process is completed, the adsorbent only needs to be placed in an external magnetic field such as an electromagnet and a permanent magnet, so that the magnetic charcoal composite adsorbent can be used for adsorbing the pollutants. The adsorbent can be rapidly separated from the solution or the suspension, the separation time can be controlled within 1-10 minutes, the recovery efficiency of the adsorbent is greatly improved, the treatment cost is reduced, and the adsorbent can be repeatedly used and has good economical efficiency and environmental protection property.

A gas-liquid contactor for capturing carbon dioxide (CO2) from atmospheric air includes an inlet; an outlet; a gas-sorbent interface disposed between the inlet and the outlet; a liquid distribution system configured to flow a CO2 capture solution along the gas-sorbent interface; a fan configured to flow the atmospheric air along a flow path from: the inlet, along the gas-sorbent interface, and to the outlet, to contact the atmospheric air with the CO2 capture solution and absorb CO2 from the atmospheric air into the CO2 capture solution to form a CO2-lean gas stream; and an electrostatic drift eliminator within the flow path downstream of the gas-sorbent interface and upstream of the outlet. The CO2-lean gas stream includes aerosols of the CO2 capture solution. The electrostatic drift eliminator is configured to ionize at least some of the aerosols of the CO2 capture solution to form ionized aerosols and collect the ionized aerosols.

The invention provides a heteroatom-doped porous carbon material for carbon dioxide adsorption as well as a preparation method and application thereof. The preparation method comprises the following steps: S1, drying and crushing waste biomass to obtain raw material powder; s2, mixing the raw material powder with an activating agent, and fully grinding to obtain a mixture of the raw material powder and the activating agent powder; s3, dissolving one or more heteroatom sources in hot deionized water to obtain a hot solution, pouring the mixture of the raw materials and the activator powder in the step S2 into the hot solution, and heating and stirring until water is evaporated; s4, performing high-temperature carbonization on the mixture finally obtained in the step S3 in an anoxic environment; and S5, cleaning and drying the product in the step S4 to obtain the heteroatom-doped porous carbon material. The heteroatom-doped porous carbon material disclosed by the invention has a highly developed pore structure, and the porous carbon prepared by taking the waste biomass as a precursor is used as a carbon dioxide adsorbent, so that high-value utilization of waste biomass resources is realized.

The invention relates to the technical field of adsorbents, and particularly discloses an aluminum oxide type adsorbent and a preparation method thereof.The preparation method comprises the following steps that lanthanum salt, cerium salt and a polyethylene glycol aqueous solution are mixed to be uniform, then the mixture is mixed with gamma-Al2O3 to be uniform, pH is adjusted, standing is conducted, solid-liquid separation is conducted, drying and roasting are conducted, and a double-doped carrier is obtained; dispersing the double-doped carrier in a mixed solution containing 2-methylimidazole, ferric salt and zinc salt, adjusting the pH value, carrying out heating reaction, solid-liquid separation and drying in an inert atmosphere, grinding to obtain powder, and carrying out molding treatment on the powder to obtain a composite carrier; uniformly mixing the Ag modified molecular sieve with silica sol, coating the surface of the composite carrier with the mixture, and drying to obtain an adsorbent precursor; dipping an adsorbent precursor in the dispersion liquid, and after dipping, solid-liquid separation and drying, reactivating to obtain the aluminum oxide type adsorbent; the prepared adsorbent can synergistically and efficiently remove multiple impurities and is excellent in corrosion resistance.

A direct air capture (DAC) of CO2 system includes a reaction reactor having a solid, amine-functionalized sorbent configured to sequester CO2 from air; an in-situ dual-function device configured as a CO2 conversion reactor and an exchange fluid regeneration device; and the exchange fluid, recirculating between the reaction reactor and the dual-function device, configured to capture the sequestered CO2 from the solid sorbent in the reaction reactor and release the captured CO2 in the conversion reactor, the exchange fluid including one or more amino acids.

An atmospheric CO2 capture system includes a compartment housing a solid CO2 sorbent, an exchange fluid including a chemical component with selectivity towards CO2, and an electrochemical cell or mineralization reactor in fluid communication with the compartment, the system having a cycle including a first state of sorbing CO2 from incoming air onto the solid CO2 sorbent until a saturation point is reached; a second state of regenerating the sorbent by flooding the compartment with the exchange fluid to detach CO2 from the saturated sorbent and bind the detached CO2 to the chemical component; and a third state of regenerating the chemical component and utilizing the CO2 in the electrochemical cell or mineralization reactor.

The embodiment of the invention provides a method for directly trapping carbon dioxide from air. The method comprises the following steps: capturing carbon dioxide in air through an adsorber; after the carbon dioxide is captured, the interior of the adsorber is vacuumized for the first time; introducing water vapor into the adsorber to increase the pressure in the adsorber and increase the temperature of an adsorbent in the adsorber so as to desorb the carbon dioxide; the adsorber is vacuumized for the second time, and mixed gas formed by water vapor and carbon dioxide is obtained; and carrying out gas-liquid separation on the mixed gas to obtain carbon dioxide. The regeneration energy consumption of the adsorbent is reduced, and the concentration of the carbon dioxide product gas is improved.

The invention discloses a temperature swing adsorption helium low-temperature purification system which comprises a vacuum cold box, and a first-stage dividing wall heat exchanger, a liquid cold medium Dewar, a high-temperature area adsorption unit, a second-stage dividing wall heat exchanger, a cold head heat exchanger and a low-temperature area adsorption unit are sequentially connected in the vacuum cold box in the gas transmission direction. Wherein the input end of the first-stage dividing wall heat exchanger is connected with the outside through a pipeline, and is used for introducing crude helium; the high-temperature area adsorption unit is used for adsorbing impurity gas with the boiling point temperature being greater than or equal to 77K in the crude helium, and the low-temperature area adsorption unit is used for adsorbing impurity gas with the boiling point temperature being 20K-30K in the crude helium, so that high-purity helium is obtained. According to the invention, not only can high-flow high-component impurity gas with the boiling point of 77K or above be treated, but also high-flow high-component impurity gas with the boiling point of 30K or below can be treated, and high-flow multi-component high-concentration industrial production working conditions can be better matched by adopting physical adsorption of the high-temperature and low-temperature region adsorbents.

The invention discloses a production method and a production device of an energy-saving sustainable aviation fuel, and the production method comprises the following steps: S1, adsorbing carbon dioxide in air by using an adsorbent, desorbing through high-temperature carrier gas, and cooling and compressing the desorbed carbon dioxide; s2, carbon dioxide and deionized water are preheated and then electrolyzed, and synthesis gas and oxygen are generated; s3, after the synthesis gas is compressed, performing Fischer-Tropsch reaction to generate a mixture of Fischer-Tropsch oil wax, light hydrocarbon and water, cooling and separating, and returning the Fischer-Tropsch reaction heat to preheat the synthesis gas; s4, pressurizing the Fischer-Tropsch oil wax, mixing the Fischer-Tropsch oil wax with hydrogen, carrying out hydrofining reaction to generate a gas-liquid isomerous oil-gas mixture, cooling and separating, and recycling heat energy of a product to And S5, after gas-liquid separation, preheating a liquid phase, carrying out rectification operation, separating and cooling to obtain a sustainable aviation fuel product. By recovering the heat in each link, the heat is efficiently utilized, and the energy-saving performance of production is improved.

The invention provides a method for efficiently synthesizing basic nickel carbonate, and belongs to the technical field of chemical preparation. Comprising the following steps: (1) preparing a mixed solution of sodium carbonate and sodium hydroxide; (2) under low-temperature and high-speed stirring conditions, dropwise adding a nickel salt solution into the mixed solution, adding a competitive adsorbent, adjusting the pH value of the solution, then heating, continuing stirring reaction, separating the competitive adsorbent by a magnet, centrifuging, washing and collecting prepared primary basic nickel carbonate; and (3) recrystallizing the primary basic nickel carbonate in an ethanol water solution, and drying to obtain the basic nickel carbonate. According to the preparation method disclosed by the invention, the content of impurity ions in the product is reduced, so that the high-purity basic nickel carbonate can be prepared, the synthesis efficiency is high, the production cost is relatively low, the method is green and environment-friendly, the competitive adsorbent can also be repeatedly utilized and recycled, the production cost is reduced, and the method has a wide application prospect.

The invention relates to the technical field of drying equipment, in particular to a low-consumption constant-temperature dehumidification device and a control method, and achieves an efficient and energy-saving constant-temperature dehumidification effect. The heat recovery module recovers heat in the condensation and regeneration process, the collaborative optimization module coordinates operation of all the modules, the energy utilization efficiency is remarkably improved, and energy consumption is reduced. The control system module dynamically adjusts the state of each module according to the real-time data of the temperature and humidity sensor, ensures the stability of the environment temperature and humidity, and further improves the control precision by adopting a dynamic decoupling control strategy. The regeneration module utilizes recovered heat energy to efficiently regenerate adsorbents and cooperates with novel composite adsorbents, the service life of the adsorbents is prolonged, and the dehumidification performance is improved. The air circulation module forms uniform airflow, and local temperature and humidity unevenness is avoided. A user can set parameters through the interaction unit, the system is controlled to automatically adjust the operation strategy, intelligent operation is achieved, and the system performance is optimized.

An atmospheric CO2 capture system includes a compartment housing a solid CO2 sorbent, an exchange fluid including a chemical component with selectivity towards CO2, and an electrochemical cell or mineralization reactor in fluid communication with the compartment, the system having a cycle including a first state of sorbing CO2 from incoming air onto the solid CO2 sorbent until a saturation point is reached; a second state of regenerating the sorbent by flooding the compartment with the exchange fluid to detach CO2 from the saturated sorbent and bind the detached CO2 to the chemical component; and a third state of regenerating the chemical component and utilizing the CO2 in the electrochemical cell or mineralization reactor.

The invention belongs to the technical field of adsorbent preparation, and relates to a preparation method of a series of M-TCBB metal organic framework materials and application of the M-TCBB metal organic framework materials to adsorption of sulfur dioxide and ammonia gas. The preparation method comprises the following steps: dispersing [9, 9 '-dicarbazole]-3, 3', 6, 6 '-tetracarboxylic acid (H4TCBB) serving as an organic ligand and any one or more of yttrium salt, zirconium salt, hafnium salt, cerium salt and thorium salt in a solution according to a certain mass ratio, and carrying out solvothermal reaction at 100-120 DEG C; and after the reaction is finished, centrifuging to take a precipitate, washing and drying to obtain a series of M-TCBB metal organic framework materials. The series of M-TCBB metal organic framework materials prepared by the invention have relatively good adsorption acting force on sulfur dioxide and ammonia gas, and are high in adsorption cycle stability; under a humid condition, capture of sulfur dioxide and ammonia gas shows a humidity enhancement characteristic, namely, water vapor promotes enhancement of the adsorption capacity of sulfur dioxide and ammonia gas.

The invention provides a method for selecting a high-concentration VOCs adsorbent at different temperatures and application, and belongs to the technical field of waste gas governing. According to the method, through testing pore structure parameters of a model adsorption material with concentrated pore size distribution, a static adsorption isotherm and a dynamic penetration curve for VOCs at different temperatures, a high-concentration VOCs adsorbent is obtained; a linear relation equation of the critical aperture and the critical pressure is established through linear fitting, then a correlation equation of the critical aperture, the temperature and the partial pressure is established, and the appropriate aperture distribution range and the model selection standard of the high-concentration VOCs adsorbent at different temperatures are determined by combining dynamic adsorption results. According to the method, the ternary matching relation equation of the VOCs partial pressure, the temperature and the critical aperture is constructed, accurate type selection of the high-concentration VOCs adsorbent at different temperatures is achieved, the pore volume utilization rate and the adsorption capacity can be improved, meanwhile, desorption energy consumption and the VOCs pyrolysis risk are reduced, and a theoretical basis is provided for adsorbent type selection and technical optimization.

The invention relates to the technical field of catalysts for gas purification, in particular to a hierarchical pore metal-based catalytic adsorbent as well as a preparation method and application thereof. The invention discloses an integrated preparation method combining a sol-gel method and a template method, which comprises the following steps of: adding a template agent before forming gel, adding a proper amount of ammonia water in an aging process, accurately controlling other reaction conditions and a raw material ratio, and controlling a spatial confinement effect of the template method and a chemical reaction in a sol-gel process to obtain a sol-gel composite material. The morphology and size of the catalytic adsorbent can be accurately regulated and controlled, the hierarchical pore metal-based catalytic adsorbent with a microporous structure as a main material and mesopores and macropores as coexistence is finally prepared, the hierarchical pore structure provides rich adsorption sites and catalytic activity centers, and the hierarchical pore metal-based catalytic adsorbent has high adsorption capacity, high selectivity, good catalytic activity, good stability and easy regeneration.

The invention discloses a Ca / Mg-based modified biochar material and a preparation method and application thereof, and the preparation method comprises the following steps: pretreatment: drying a biomass material shaddock peel, crushing, sieving, washing and drying, then carrying out acid leaching activation, washing again and drying to obtain high-activity biomass powder for later use; dipping modification: fully mixing the high-activity biomass powder obtained in the pretreatment step with CaO and MgO, adding distilled water, dipping under heating and stirring conditions, then carrying out solid-liquid separation, washing a filter cake for multiple times, freeze-drying, and sieving to obtain an intermediate product; the intermediate product is calcined, naturally cooled, washed and dried, and the Ca / Mg-based modified bimetallic modified charcoal material is obtained and can be applied to adsorption of phosphate in a wastewater solution as an adsorbent. The preparation method is simple, the raw materials are easy to obtain, the cost is low, the material stability is good, the pH adaptability is good, the adsorption effect is good, and the method is suitable for water environments with more complex pollution factors.

The invention discloses a hydrogen purification pressure optimization system and a control strategy for hydrogen production through electrolysis of water, and relates to the technical field of hydrogen production through electrolysis of water, and the hydrogen purification system comprises a hydrogen purification unit which comprises a plurality of adsorption towers arranged in parallel and is used for adsorbing and removing impurities in hydrogen; the pressure optimization system comprises a pressure sensor, a pressure regulating valve and a controller, the pressure sensor is used for monitoring the pressure in the adsorption tower in real time, the pressure regulating valve regulates the pressure according to an instruction of the controller, and the controller is used for regulating the pressure according to the adsorption characteristics of the adsorbent and the requirements of the hydrogen purification process. Setting pressure control parameters to adjust the pressure in the adsorption tower in real time; and the control unit is used for performing coordinated management on the temperature and the flow of the pressure optimization system, and forming closed-loop feedback regulation of parameters by comparing the actual purity of the purified hydrogen with a preset purity standard. The hydrogen purity is improved, the adsorbent works under the optimal pressure by optimizing the pressure control strategy, the hydrogen purity is effectively improved, and the energy consumption is reduced.

A gas-liquid contactor for capturing carbon dioxide from atmospheric air includes at least one inlet; at least one outlet spaced apart from the at least one inlet; a gas-sorbent interface disposed between the at least one inlet and the at least one outlet; a liquid distribution system configured to flow a CO2 capture solution along the gas-sorbent interface; at least one gas-circulating device configured to flow atmospheric air along a flow path to contact the atmospheric air with the CO2 capture solution and absorb CO2 from the atmospheric air into the CO2 capture solution to form a CO2-lean gas stream flowable through the at least one outlet, wherein the CO2-lean gas stream is deflected from a downward direction to an upward direction causing at least a portion of aerosolized particles in the CO2-lean gas stream to exit said CO2-lean gas stream upstream of the at least one outlet.

A system for generating methane includes a scrubber, a stripper, a vacuum pump, a water separator, and a Sabatier reactor. The scrubber is configured to absorb one or more contaminants from an air stream into a liquid sorbent, in which the one or more contaminants include carbon dioxide. The stripper is configured to desorb the one or more contaminants from the liquid sorbent. The vacuum pump is configured to pressurize the desorbed contaminants to a reaction pressure of the carbon dioxide. The water separator is configured to remove water from the pressurized, desorbed contaminants. The Sabatier reactor is configured to generate the methane from the carbon dioxide of the pressurized, desorbed contaminants.

The invention discloses a modularized carbon capture system and method for flue gas treatment in the carbon industry, and belongs to the technical field of carbon capture, and the modularized carbon capture system comprises a flue gas treatment module, a solid amine adsorption module and a membrane separation module which are connected in sequence. The flue gas treatment module is used for treating the flue gas, so that the flue gas meets the optimal adsorption state of the solid amine adsorption module, and the damage to the membrane separation module can be avoided while the damage of impurities to the performance of an adsorbent is avoided; cO2 in flue gas is efficiently captured through the solid amine adsorption module, so that the capturing efficiency of CO2 is improved; the solid amine adsorption module sends CO2 rich gas into the membrane separation module for high-purity separation and purification, the membrane assembly does not need high-pressure operation or multi-stage series connection for separation of the CO2 rich gas, energy consumption is low, the solid amine adsorption module exhausts purified flue gas in advance before the CO2 rich gas is sent into the membrane separation module, the membrane assembly is further prevented from being polluted, and the solid amine adsorption module does not need high-pressure operation or multi-stage series connection for separation of the CO2 rich gas. The separation efficiency and the service life of the membrane module are further ensured.

Provided is a low-temperature adsorption system for flue gas, comprising a spray tower (1) and an adsorption tower (2) which are connected to each other, wherein the spray tower (1) has multiple-stage spray chambers, a spray assembly is correspondingly provided in each spray chamber and is configured to spray a spray liquid so as to cool down flue gas in the spray chamber, and the flue gas is cooled to below room temperature in the spray tower (1), and is then conveyed to the adsorption tower (2), thereby avoiding the problem that a conveying pipeline is blocked because moisture in the flue gas condenses into ice. The adsorption tower has an adsorption chamber (204) and a heat exchange chamber (202), an adsorbent (2042) is provided in the adsorption chamber (204), and the heat exchange chamber (202) is configured to continuously introduce a cooling liquid so as to indirectly cool both the flue gas and the adsorbent (2042), such that adsorption and purification of the flue gas are performed in a subzero-temperature zone, and the cooling liquid after heat exchange is supplied to any one-stage spray assembly as the spray liquid sprayed by the spray assembly.

The invention relates to the technical field of PSA (Pressure Swing Adsorption) hydrogen extraction, in particular to a hydrogen purification process based on a PSA device, which comprises the following steps: raw material gas is firstly decompressed and enters the PSA device, a product hydrogen after impurity removal is sent to the outside, desorbed gas of the PSA device is pressurized by a desorbed gas compressor and is sent to a first-section shift converter, the raw material gas enters an adsorption tower in an adsorption state, and the desorbed gas enters a second-section shift converter; under the action of a special adsorbent, CO, N2, CH4O, CH4, AR and other components in the raw material gas are adsorbed, and high-purity H2 flows out of the tower top, is subjected to pressure stabilization metering through a regulating valve and then is sent out. According to the hydrogen purification process based on the PSA device, residual impurities can be deeply removed by using two-stage pressure swing adsorption, additionally arranging a two-stage adsorption tower and performing post-treatment detection on hydrogen, the impurity content required by high-purity hydrogen needs to be controlled at a ppm level, the purity of the hydrogen can stably rise to 99.99% or even higher through two-stage PSA, and the purity of the hydrogen is greatly improved. The use standard of ultra-high-purity hydrogen in the production of semiconductors and photovoltaic cells is met, and the process stability and the yield of products are guaranteed.

A direct air capture (DAC) facility for capturing carbon dioxide (CO2) from atmospheric air is disposed on a plot of land having a prevailing wind direction and includes at least one contactor wall formed from a plurality of gas-sorbent contactors positioned side by side and a regeneration facility in communication with the plurality of gas-sorbent contactors The at least one contactor wall is disposed on the plot of land and extends along a wall axis parallel to the prevailing wind direction. Each gas-sorbent contactor of the plurality of gas-sorbent contactors includes a housing including a plurality of structural members; at least one air inlet and at least one air outlet;  a gas-sorbent interface; and at least one fan. The regeneration facility is configured to process the CO2-rich sorbent and to regenerate the CO2-rich sorbent to form a regenerated sorbent for the plurality of gas-sorbent contactors.

An article for joule heating is described, including a three-dimensional substrate on and / or in which a pyrolyzate of a phenolic resin or polymer forms an electrically conductive carbon network. Such articles may be incorporated in structured materials applications, which may include support, sorbent, and or catalyst components. Also described are methods of fabricating such articles and structured materials, and apparatus comprising same, and methods of use of such articles and structured materials and apparatus for conducting material transformation processes requiring input of heat for their performance, such as CO2 adsorption, methane pyrolysis for hydrogen and carbon production, hydrogen-assisted conversion of CO2 to hydrocarbons, including catalytic conversion of CO2 to olefins, catalytic conversion of CO2 to propane (liquefied petroleum gas), and catalytic conversion of CO2 to renewable natural gas, reverse water gas shift reaction, steam ethane cracking, propane cracking, steam methane reforming, and dry methane reforming.

The invention relates to the technical field of wastewater treatment, and provides a pretreatment device and method for wastewater containing heavy metal ions, and the pretreatment device comprises a water inlet unit, a multi-stage reaction unit, a solid-liquid separation unit, a deep adsorption unit and an intelligent control unit; the water inlet unit comprises a wastewater storage pool and a pH adjusting pool, and the pH adjusting pool is provided with a pH sensor and a dosing device; the multi-stage reaction unit consists of three rotational flow reaction tanks which are connected in series, and spiral guide plates are arranged in the tanks to enhance mixing; the solid-liquid separation unit comprises an inclined plate sedimentation tank and a centrifugal filter; a sludge return pipe is arranged at the bottom of the inclined plate sedimentation tank and extends to the reaction tank; the deep adsorption unit is filled with a modified zeolite-activated carbon composite adsorbent, and a heavy metal ion concentration online monitor is arranged at the rear end; the intelligent control unit dynamically adjusts the dosage and the reaction time based on pH and concentration data. The device has the beneficial effects that the mixing efficiency of wastewater treatment is enhanced, the pH application range of wastewater treatment is widened, and the cost is reduced.

This invention relates to materials, methods, and systems for carbon dioxide (CO2) capture. More specifically, this invention relates to materials, methods, and systems for removing, capturing, separating, and / or adsorbing carbon dioxide (CO2) from a gas mixture. Additionally, this invention relates to materials, methods, and systems for direct air capture (DAC) of CO2 from ambient air. This invention also relates to materials, methods, and systems for direct air capture (DAC) and methanation of CO2 from ambient air.

The invention relates to the technical field of adsorbent preparation, in particular to an ammonia modified porous carbon adsorbent and a preparation method thereof. The preparation method of the ammonia modified porous carbon adsorbent comprises the following steps: carrying out hydrothermal acid leaching on gasified fine residues and an acid solution to obtain acid leaching residues; stirring the acid leaching residues in an alkali solution, washing and drying to obtain a porous carbon material; and dipping the porous carbon material in a tetraethylenepentamine solution, and then drying to obtain the ammonia modified porous carbon adsorbent. The ammonia modified porous carbon adsorbent is successfully constructed by taking a porous carbon material derived from coal gasification fine slag as a substrate and further adopting a surface ammonia functionalization modification strategy. The preparation method is simple, the raw materials are easy to obtain, and the prepared ammonia modified porous carbon adsorbent has a good adsorption effect on methylene blue and hexavalent chromium. According to the method, high-added-value resource utilization of the coal gasification solid waste is achieved, and a solution is provided for treatment of the dye wastewater and the heavy metal wastewater.