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US 2014/0097141 A1Published application
Synthesis of layered metal sulfide ion-exchangers
AssigneeNorthwestern University
InventorsMercouri G. Kanatzidis, Zohreh Hassanzadeh Fard
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Abstract
Methods for the synthesis of compounds of the formula A2xMxSn3-xS6, where x has a value in the range from 0.5 to 1; A is Li+, Na+, K+, or Rb+; and M is Mg2+, Mn2+, Zn2+, or Fe2+, are provided. Also provided are methods of remediating fluid samples using the compounds.
Claims11
A method for the synthesis of a compound of the formula A2xMxSn3-xS6, where x has a value in the range from 0.5 to 1;
- A is Li+, Na+, Rb+, or Cs+;
- and M is Mg2+, Ca2+, Mn2+, Zn2+, or Fe2+, wherein the method is a solid state method comprising heating a reaction mixture of A2CO3, M, S and Sn to a temperature and for a time sufficient to produce the compound of the formula A2xMxSn3-xS6, via a solid state reaction.
A method for the synthesis of a compound of the formula A2xMxSn3-xS6, where x has a value in the range from 0.5 to 1;
- A is Li+, Na+, Rb+, or Cs+;
- and M is Mg2+, Ca2+, Mn2+, Zn2+, or Fe2+, wherein the method is a hydrothermal method comprising heating a reaction mixture of A2CO3, M, S, Sn and water to a temperature and for a time sufficient to produce the compound of the formula A2xMxSn3-xS6, via a hydrothermal reaction, and further wherein heating the reaction mixture comprises heating the mixture to a temperature of no greater than about 250° C. for a time of no greater than about 10 hours and further wherein the method provides a yield of the compound having the formula A2xMxSn3-xS6 of at least about 70%, based on total mass.
A method comprising:
- exposing a fluid sample comprising at least one of Cr6+, Nd3+, As3+, As5+, Se4+, and Se6+ ions to a chalcogenide compound having the formula A2xMxSn3-xS6, where x has a value in the range from 0.5 to 1;
- A is Li+, Na+, K+, or Rb+ and M is Mg2+, Ca2+, Mn2+, Zn2+, Fe2+, whereby the chalcogenide compound absorbs the ions;
- and removing the absorbed ions from the fluid sample.
A method comprising:
- exposing a fluid sample comprising at least one of the compounds K2Hg(CN)4 and KAg(CN)2 to a chalcogenide compound having the formula A2xMxSn3-xS6, where x has a value in the range from 0.5 to 1;
- A is Li+, Na+, K+, or Rb+;
- and M is Mg2+, Mn2+, Zn2+, or Fe2+, whereby the chalcogenide compound absorbs Hg2+ or Ag2+ ions;
- and
- removing the absorbed ions from the fluid sample.
2 more elements
Dependencies are inferred from the claim text.