The invention regards a composite for environmental remediation, comprising: —one or more green rust compound(s) or green rust precursor(s), and—one or more biochar(s).

There is provided a system and a method for transferring energy, the method comprising the steps of: a)feeding a material comprising an absorbed fluid into a tube, b) heating the tube so that the fluid is desorbed in gas phase from the material, so that a fluid flow is created by the desorbed fluid in the tube, causing a flow of the material present as particles, and c) performing one of i) separating the material from the fluid so that a charged material is obtained, and ii)cooling the material and fluid so that the fluid is absorbed by the material whereby heat is released. An advantage is that no active transport means such as pumps are needed to transport the material during charging.

An atmospheric water harvesting material includes a deliquescent salt, a photothermal agent, and a polymeric hydrogel matrix containing the deliquescent salt and photothermal agent.

Dangerous, toxic, and/or radioactive volatiles are produced from nuclear fission, nuclear decay, and/or as a byproduct from vitrification of radioactive wastes. Such volatiles are treated during and after vitrification of the radioactive waste, to be converted into fixed-chemicals, that are retained in, on, and/or proximate to a cold-cap located vertically above vitrified melt. The cold-cap may have one or more volatile fixing additives (VFAs) for retaining the fixed-chemicals. The VFAs are located in and/or the cold-cap. The vitrification may occur within at least one human-made cavern. The human-made cavern may be located within a deep geologic rock formation. The deep geologic rock formation may be located at least 2,000 feet below a terrestrial surface of the Earth. The human-made cavern may be formed by first drilling a wellbore from the terrestrial surface to the deep geologic rock formation and then underreaming the wellbore into the deep geologic rock formation.

An atmospheric water harvesting material includes a deliquescent salt, a photothermal agent, and a polymeric hydrogel matrix containing the deliquescent salt and photothermal agent.

An atmospheric water harvesting material includes a deliquescent salt, a photothermal agent, and a polymeric hydrogel matrix containing the deliquescent salt and photothermal agent.

An adsorbent and a method of preparing the adsorbent are described. The adsorbent includes a 2-anthracene ammonium magnetic ionic liquid (MIL), and a [FeCl.sub.4].sup. or a [CoCl.sub.3].sup. ion. The adsorbents, 2-anthracene ammonium tetrachloroferrate (III) ([2AA] FeCl.sub.4) and 2-anthracene ammonium trichlorocobaltate (II) ([2AA] CoCl.sub.3), are prepared by protonation of 2-aminoanthracene, followed by complexation with FeCl.sub.3/CoCl.sub.2. The adsorbent of the present disclosure is effective in removing contaminants such as heavy metal ions from an aqueous system in a cost-efficient and selective manner.

The disclosed subject matter relates to a reactive matrix for the sorption/desorption of a heat transfer fluid (FG) in a reactor of a cold production device, this matrix comprising a compacted mixture of sorbent, of the manganese chloride monohydrate type, and expanded natural graphite in a preferred proportion of 79/21. The disclosed subject matter also relates to a method for manufacturing a wafer from this matrix and a reactor comprising a stack of such wafers.

The disclosed subject matter relates to a reactive matrix for the sorption/desorption of a heat transfer fluid (FG) in a reactor of a cold production device, this matrix comprising a compacted mixture of sorbent, of the manganese chloride monohydrate type, and expanded natural graphite in a preferred proportion of 79/21. The disclosed subject matter also relates to a method for manufacturing a wafer from this matrix and a reactor comprising a stack of such wafers.

Provided are sorbents and associated methods and systems for removing mercury from process gases or fluid streams. The sorbents may include activated carbon and pyrite. The sorbents may optionally include one or more additives, such as a halide salt.