Disclosed in certain embodiments are carbon dioxide sorbents that include porous particles impregnated with an amine compound.

Systems and methods for direct air capture of carbon dioxide or other gases utilize a calcium sorbent in a manner that allows for wide scale, relatively low cost implementation. In particular, a calcium sorbent may be provided as a substantially thin coating on one or more substrates and utilized for direct air capture of carbon dioxide through chemisorption. The carbonated sorbent may be disposed of for sequestration of the carbon dioxide or regenerated with capture of carbon dioxide released from the carbonated sorbent during the regeneration process.

An ink for three dimensional printing a ceramic material includes metal oxide nanoparticles and a polymer resin, where a concentration of the metal oxide nanoparticles is at least about 50 wt % of a total mass of the ink. A method of forming a porous ceramic material includes obtaining an ink, where the ink comprises a mixture of metal oxide nanoparticles and a polymer, forming a body from the ink, curing the formed body, heating the formed body for removing the polymer and for forming a porous ceramic material from the metal oxide nanoparticles. The forming the body includes an additive manufacturing process with the ink.

A method of water decontamination includes contacting sulfur-doped silver tungstate (Ag.sub.2WO.sub.4) nanoparticles with an aqueous solution to form a mixture. The aqueous solution includes one or more pollutants. The method further includes mixing the mixture and collecting a filtrate. The filtrate has fewer of the one or more pollutants than the aqueous solution. The amount of sulfur present in the sulfur-doped Ag.sub.2WO.sub.4 nanoparticles is in a range from 5% to 30% of the total weight of the sulfur-doped Ag.sub.2WO.sub.4 nanoparticles, and the sulfur-doped Ag.sub.2WO.sub.4 nanoparticles are spherical particles with diameters ranging from 2 nanometers (nm) to 40 nm.

The invention relates to a magnetic mesoporous material based on functionalised silica (3MS-f), the method comprising the steps of: i) hydrolysing and precondensing, in an acid medium, a silica precursor (SiO.sub.2) in the presence of a porogen compound having the formula (POE).sub.n-(POP).sub.m-(POE).sub.n wherein: -POE is a polyoxyethylene block; -POP is a polyoxypropylene block; -n is equal to 20 or 106 and -m is equal to 70; ii) incorporating silica-coated superparamagnetic iron nanoparticles into the precondensed mixture obtained in step i) and continuing the condensation; iii) removing the porogen agent from the obtained condensed structure, whereby an organised magnetic mesoporous material based on silica (3MS) is obtained; iv) functionalising the material (3MS) obtained in the preceding step by covalently grafting at least one reactive function that is capable of forming a weak bond with at least one organic molecule of interest (MIO), the weak bond being selected in particular from among electrostatic bonds between oppositely charged groups such as carboxylate/ammonium, phosphonate/ammonium or sulphonate/ammonium and hydrophobic bonds such as bonds between alkyl chains or between aromatic groups; v) optionally, recovering the functionalised magnetic mesoporous material based on silica (3MS-f) obtained in the preceding step.

Use of a zinc-aluminum spinel particle as a CO.sub.2 reversible adsorption material, a CO.sub.2 reversible adsorption material and a CO.sub.2 reversible adsorption composition, a CO.sub.2 capture method and a regeneration method of the CO.sub.2 reversible adsorption material or the CO.sub.2 reversible adsorption composition. The zinc-aluminum spinel particle having a specific microstructure has a micropore+mesopore porous structure and a relatively high specific surface area, thus having a function of adsorbing and capturing CO.sub.2 and being easy to regenerate, and is used as a CO.sub.2 adsorption and capture material with great application potential. The CO.sub.2 capture method can realize direct air capture of CO.sub.2, can be adapted to a variety of application scenarios, and has good universal applicability.

Method(s) and system(s) for the direct production of lithium and other metals from a brine solution containing salts of various metal cations at room temperature via a combined sorbent extraction and electrochemical extraction/plating process. This process uses a skeleton structure material that can reversibly insert/extract a desired metal cation to absorb the desired metal ions from a brine solution. The metal impregnated skeleton structure material is then transferred to an electrochemical cell where the metal ions are extracted from the structure and plated in the form of metal onto an electronically conductive substrate. This process is a combination of methods to take metal ions directly from a brine solution to produce an end-product of metal and is a significant improvement over current industrial processes that will reduce the energy required for metal production.

Systems and methods for direct air capture of carbon dioxide or other gases utilize a calcium sorbent in a manner that allows for wide scale, relatively low cost implementation. In particular, a calcium sorbent may be provided as a substantially thin coating on one or more substrates and utilized for direct air capture of carbon dioxide through chemisorption. The carbonated sorbent may be disposed of for sequestration of the carbon dioxide or regenerated with capture of carbon dioxide released from the carbonated sorbent during the regeneration process.

This invention generally relates to a process for producing lithium aluminum double hydroxide (LADH) lithium selective adsorbents, which uses an intercalation reaction liquor having a stoichiometric amount of lithium to intercalate an adsorbent precursor or a spent LADH adsorbent, and thereby produce an intercalated layered aluminate adsorbent. The intercalated layered aluminate adsorbent is neutralized using an acid at a predetermined neutralization temperature to produce the lithium selective adsorbent. The stoichiometric amount of lithium used in the intercalation reaction liquor is less than about 10 lb. lithium per cubic foot of the lithium selective adsorbent.

A method of recovering desalinated activated alumina (AA) beads from a composition including salt laden (high salt absorbed) activated alumna (AA) beads and free anions and free cations, comprising the step of electrodialysis of the composition to reduce salt content of the activated alumina (AA) beads to produce a stream comprising the desalinated activated alumina (AA) beads.