Oleophilic-hydrophobic-magnetic (OHM) porous materials are provided. In embodiments, an OHM porous material comprises a porous substrate having a solid matrix defining a plurality of pores distributed through the solid matrix, the OHM porous material further comprising a coating of a nanocomposite on surfaces of the solid matrix. The nanocomposite comprises a multilayer stack of a plurality of layers of a two-dimensional, layered material having nucleation sites interleaved between a plurality of layers of magnetic nanoparticles, wherein individual layers of magnetic nanoparticles in the plurality of layers of magnetic nanoparticles are each directly anchored on a surface of a layer of the plurality of layers of the two-dimensional, layered material via the nucleation sites, and are each separated by multiple layers of the plurality of layers of the two-dimensional, layered material. Methods of making and using the OHM porous materials are also provided.

A sorbent article is described including a sorbent region, a desorbing media region, and a selective barrier layer positioned at least between the two regions. Also described are methods of forming the sorbent article and methods of using the sorbent article for the purpose of swing adsorption, including for direct air capture (DAC) of carbon dioxide. The selective barrier layer may be impermeable to water and water vapor to protect the sorbent region. The sorbent article may be collapsible, wherein the selective barrier layer collapses into an adsorptive configuration to maximize access to the sorbent region during adsorption and expand into a desorptive configuration to maximize access to the desorbing media region during desorption.

An integrative approach combines a process of adsorption and ozonation which are used for removing the indigo dye from textile wastewater and the regeneration of adsorbent materials. Metal oxide modified adsorbents are efficient dye adsorbent materials for indigo dye wastewater and are used have been developed for adsorption process and regenerated by ozonation process. Upon the regeneration process, the adsorption capacity has been recovered. The synergistic effect of adsorption and ozonation benefit for the efficient dye removal from wastewater and the adsorbent regeneration achieved in an environmentally friendly and cost effective way.

A process for the providing a regenerant gas stream for a regenerable adsorbent used to remove water and hydrogen sulfide from a reactor effluent in a catalytic dehydrogenation process is described. The reactor effluent is compressed in a compressor to provide a compressed effluent. The compressed effluent may be treated to remove chlorides, and then passed to a dryer zone having a regenerable adsorbent. A regenerant gas stream is used to desorb the water and hydrogen sulfide and the spent regenerant stream may be passed to a cleaning zone having a sorbent configured to remove hydrogen sulfide from the spent regenerant stream. The cleaned regenerant gas stream may be recycled to the dryer zone to desorb and/or regenerate the regenerable adsorbent.

A system and method treat oilfield produced water by two-stages of hazardous sulfide treatments. In an embodiment, a two-stage oil and gas field produced water treatment system includes an oil removal vessel. The oilfield produced water is introduced to the oil removal vessel. The oil removal vessel removes a portion of the hydrocarbons from the oilfield produced water to provide a reduced oil produced water. In addition, the system includes an iron sponge. The reduced oil produced water is introduced to the iron sponge, and the iron sponge removes a portion of the hazardous sulfides from the reduced oil produced water to provide a reduced sulfide produced water. The system also includes a stabilized sodium percarbonate solution. The stabilized sodium percarbonate solution is mixed with the reduced sulfide produced water to remove a portion of the hazardous sulfides from the reduced sulfide produced water to provide a treated produced water.

A method of lithium sorption recovery from natural brines and wastewaters. The method comprises introducing a feed lithium-containing brine to a sorption-desorption concentrating module in a form of a vertically mounted column filled with an inorganic granulated sorbent, being a chlorine-containing lithium aluminum double hydroxide. After the sorption, residual lithium-containing feedstock is drained from the column, then washing is made at a rate of at least 6 column volumes per hour in the amount of 150-250% of the sorbent volume, in the same direction as of the feed lithium-containing brine flow. Then lithium desorption from the sorbent is performed with desalinated water in the same direction as of the feed lithium-containing brine flow to obtain a lithium enriched solution. The obtained solution containing almost pure lithium chloride concentrate. The method results in reduced lithium losses with the washing solution and increased purity of the target LiCl concentrate.

A particulate, heterogeneous solid CO.sub.2 absorbent composition, comprising decomposition products of Ca.sub.3Al.sub.2O.sub.6 after having been heated to a temperature between 500 C. and 925 C. in the presence of H.sub.2O and CO.sub.2 for a period of time sufficient to allow the Ca.sub.3Al.sub.2O.sub.6 to react and form the particulate, heterogeneous absorbent composition which exhibits a higher concentration of aluminum than calcium in the particle core but a higher concentration of calcium than aluminum at the particle surface. The invention also comprises a method for preparing the particulate, heterogeneous product as well as a method for utilizing the composition for separating CO.sub.2 from a process gas.

Nanoparticle-treated particle packs, such as sand beds, may effectively filter and purify liquids such as waste water. When tiny contaminant particles in waste water flow through the particle pack, the nanoparticles will capture and hold the tiny contaminant particles within the pack due to the nanoparticles' surface forces, including, but not necessarily limited to van der Waals and electrostatic forces. Coating agents such as alcohols, glycols, polyols, vegetable oil, and mineral oils may help apply the nanoparticles to the particle surfaces in the filter beds or packs.

The invention relates to a mixed salt composition which is useful as a CO.sub.2 sorbent. The mixed salt composition comprises a Mg salt, and at least one Group IA element salt, where the Mg and Group IA element are present at a molar ratio of from 3:1 to 8:1. The resulting composition can adsorb about 20% or more of CO2 in a gas. Via varying the molar ratios of the components, and the Group IA element, one can develop compositions which show optional functionality at different conditions. The composition is especially useful in the adsorptive capture of CO.sub.2 on mobile sources, such as transportation vehicles, where it can be recovered during regeneration of the adsorbent composition and the CO.sub.2 used as a coolant gas, as a reactant in manufacture of fuel, and so forth.

A process for the separation of a gas from a gas stream using metal organic framework that is reversibly switchable between a first conformation that allows the first gas species to be captured in the metal organic framework, and a second conformation that allows the release of the captured first gas species, using light as the switching stimulus. The metal organic framework may comprise a metal and one or more ligands, in which the ligands contain an isomerizable group within the molecular chain that forms a link between adjacent metal atoms in the metal organic framework.