Compound, Synthesis Method Thereof, and Separation and Recovery Agent Thereof

Abstract

To provide a new compound with pores finely tunable in size so as to take up a specific element and release the specific element taken up in the pores as necessary, a synthesis method of the new compound, and a separation and recovery agent. The new compound represented by the following molecular formula:(NH4)[Ln(C2O4)2(H2O)]wherein Ln represents a lanthanide selected from Sm, Eu, Tb, Dy, Ho, Er, Tm, Yb, and Lu.

1 .- 5 . (canceled) 
     
     
         6 . A method for separating ions from water, comprising adding a separation and recovery agent comprising a compound of formula (1) to water,
   (NH 4 )[Ln(C 2 O 4 ) 2 (H 2 O)]  (1),
   wherein Ln is selected from the group consisting of Sm, Eu, Tb, Dy, Ho, Er, Tm, Yb, and Lu,   wherein the water comprises ions,   wherein the separation and recovery agent adsorbs the ions present in the water to form a coordination polymer with adsorbed ions.   
     
     
         7 . The method of  claim 6 , wherein the ions are selected from the group consisting of strontium ions, barium ions, and cesium ions. 
     
     
         8 . The method of  claim 6 , further comprising removing the coordination polymer with adsorbed ions from the water. 
     
     
         9 . The method of  claim 8 , further comprising recovering the ions from the coordination polymer with adsorbed ions. 
     
     
         10 . The method of  claim 8 , wherein the coordination polymer with adsorbed ions is removed from the water by filtration. 
     
     
         11 . The method of  claim 9 , wherein the ions are recovered from the coordination polymer with adsorbed ions by placing the coordination polymer with adsorbed ions in an acidic condition. 
     
     
         12 . The method of  claim 6 , wherein Ln is selected from the group consisting of Tb, Er, and Tm. 
     
     
         13 . The method of  claim 6 , wherein the ions are strontium ions and Ln is selected from the group consisting of Er and Tm. 
     
     
         14 . The method of  claim 6 , wherein the ions are barium ions and Ln is Tb. 
     
     
         15 . The method of  claim 6 , wherein the water is seawater.