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.

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) ([2 AA] FeCl.sub.4) and 2-anthracene ammonium trichlorocobaltate (II) ([2 AA] 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.

A sorbent for nutrient removal, preferably nitrate and phosphate removal, or PFAS removal comprising: a porous carbon structure, and a metal doped into the structure, so the metal cannot be removed from the carbon structure by water. The porous carbon structure may comprise an inexpensive carbon source. The metal may be iron, magnesium, zirconium, or aluminum. Preferably, the sorbent comprises 0.1-20% metal compound by weight. Also, a method for nutrient or PFAS removal from water, the steps comprising: providing a sorbent comprising a porous carbon structure, comprising a metal doped into the structure; flowing a polluted water over the sorbent; and, selectively adsorbing a contaminant from the polluted water with the sorbent.

Biogenic activated carbon compositions disclosed herein comprise at least 55 wt % carbon, some of which may be present as graphene, and have high surface areas, such as Iodine Numbers of greater than 2000. Some embodiments provide biogenic activated carbon that is responsive to a magnetic field. A continuous process for producing biogenic activated carbon comprises countercurrently contacting, by mechanical means, a feedstock with a vapor stream comprising an activation agent including water and/or carbon dioxide; removing vapor from the reaction zone; recycling at least some of the separated vapor stream, or a thermally treated form thereof, to an inlet of the reaction zone(s) and/or to the feedstock; and recovering solids from the reaction zone(s) as biogenic activated carbon. Methods of using the biogenic activated carbon are disclosed.