Method for the preparation of sorbent material for use as adsorbent for carbon dioxide separation from a gas mixture, the sorbent material having primary amine or secondary amine moieties, or a combination thereof, immobilised on a solid support, wherein the sorbent material has primary amine or secondary amine moieties, or a combination thereof, is treated so as to have, after treatment, a total metal impurity content below 1400 ppm.

A polyamine including a ring-containing polyamine having a piperazine ring. At least one of two nitrogen atoms of the piperazine ring is bonded to a chain substituent represented by -(A1-NR1).sub.m-X, where m represents an integer of 2 to 50, A1 represents an alkylene group having 2 to 6 carbon atoms, a plurality of A1 may be identical or different from each other, R1 is a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, or an alkylamino group having 1 to 6 carbon atoms, a plurality of R1 may be identical or different from each other, and at least one R is a hydrogen atom or an alkylamino group having 1 to 6 carbon atoms, and X is a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, or an alkylamino group having 1 to 6 carbon atoms.

An organic solvent recovery system of the present invention includes: an organic solvent recovery device that includes a first adsorbing material, and further includes at least three treatment tanks that alternately perform an adsorption treatment of adsorbing the organic solvent and of discharging a first treated gas, a desorption treatment of desorbing the organic solvent and of discharging a desorbed gas, and a drying treatment of drying the first adsorbing material and of discharging a dry outlet gas; an organic solvent concentration device that includes a second adsorbing material, adsorbs the organic solvent from the first treated gas, discharges a second treated gas, desorbs the organic solvent with a desorbing gas, and discharges the organic solvent as a concentrated gas; and a return flow path that returns the concentrated gas.

A device for regenerating materials using a plasma field. The device includes a flow unit configured to flow a gas or a liquid and a plasma unit coupled to the flow unit and including a plurality of electrodes and a sorbent bed having a sorbent material. The plasma unit is configured to receive the flow of the gas or liquid from the flow unit so that the gas or liquid flows through the sorbent material and a predetermined chemical species in the gas or liquid is adsorbed or absorbed by the sorbent material. The device also includes a power source providing a power signal to one or more of the electrodes. The electrodes are configured so that the power signal generates a plasma field in the sorbent material that causes the adsorbed or absorbed chemical species to desorb from the sorbent material.

Methods and systems directed to the separation of tritium from an aqueous stream are described. The separation method is a multistage method that includes a purification stage during which tritium of a tritium-contaminated aqueous stream is adsorbed onto a cooled and wet separation phase, a regeneration stage during which the adsorbed tritium is exchanged with hydrogen in a gaseous stream to regenerate the separation phase and provide a gaseous stream with a high tritium concentration, and a third stage during which the tritium of the gaseous stream is separated from the gaseous stream as a gaseous tritium product.

A method and system are disclosed for regenerating carbonaceous adsorbent, the method comprising the steps of: a) providing a carbonaceous adsorbent comprising a catalyst and adsorbed contaminants, b) pyrolysing of the adsorbed contaminants, c) reactivating the carbonaceous adsorbent by subjecting the carbonaceous adsorbent to steam thereby obtaining a reactivated carbonaceous adsorbent, d) cooling the thus obtained reactivated carbonaceous adsorbent to a temperature of less than 250 C. and e) oxidizing catalyst that is in a reduced state following steps b) and c) comprised in the reactivated carbonaceous adsorbent.

Sorbent materials that are treated with ions, salts, oxides, hydroxides, or carbonates of calcium, magnesium, strontium, or barium are useful in removing perfluoroalkyl and polyfluoroalkyl substances (PFAS), perfluorooctanoic acid (PFOA), perfluorooctanesulfonic acid (PFOS), 2,3,3,3,-tetrafluoro-2-(heptafluoropropoxy)propanoate and heptafluoropropyl 1,2,2,2-tetrafluoroethyl ether, and similar compounds from liquids and gases are disclosed. The sorbent materials with the disclosed treatments offer improved performance as measured against untreated sorbent materials.

Systems and methods of direct air capture are described. Systems include a plurality of moving adsorber panels in a linear direction (or circular configuration) and one or more fans configured to move air across the adsorber panels; such adsorber panels may be oriented vertically or horizontally, relative to the ground. Systems may include an independent regeneration box that comprises a system of headers, ducts and valves configured to deliver and remove a plurality of gases to the regeneration box. The regeneration box contains multiple chambers such that steps such as oxygen removal and panel cooling may be performed independently from and simultaneously to thermal preheating and desorption of the CO.sub.2 on the panels. The desorption panels may be configured to achieve counter-current flow to the hot gases used for thermal preheating and desorption. A multi-stage heat pump may facilitate reuse of waste heat and decarbonization of the process heating requirements.

A system and a method for continuously separating carbon dioxide from gas mixtures, utilizing a continuous loop of porous monoliths which support a sorbent within its pores. Continuously exposing a portion of the continuous loop of monoliths to a flow of gas mixture containing a minor proportion of carbon dioxide, to adsorb carbon dioxide from the flow. The loop passes through a sealed regeneration and carbon dioxide capture assembly located astride a portion of the loop, and which is capable of sealingly containing a monolith in relative movement through the assembly. The assembly chamber comprises a plurality of separately sealed zones, including at least one zone for purging oxygen from the monoliths, a subsequent zone for heating the monolith to release the adsorbed carbon dioxide, and another cooling zone for cooling the monolith prior to reentering the adsorption portion of the loop where it is exposed to oxygen.

Structured sorbents including a metal organic framework, hydrophobic binder, and hydrophobic carrier, wherein the hydrophobic carrier includes fluorinated silica. Methods of making structured sorbents and using structured sorbents in direct air capture of CO.sub.2.