Magnetic-cored dendrimer, the method for preparing the same, and the contaminant treatment method using the same

Abstract

Provided is a magnetic-cored dendrimer represented by the following Chemical Formula (1): wherein A represents a metal nanoparticle; Z is a hydrophilic functional group or hydrophobic functional group; and m and n each represent an integer 1 or larger. More particularly, provided are a magnetic-cored dendrimer end-capped with hydrophilic or hydrophobic terminal groups, and a method for preparing the same. The magnetic-cored dendrimer may be used to adsorb and separate contaminants in a simple and effective manner.

1 . A magnetic-cored dendrimer represented by the following Chemical Formula (1): 
       
         
           
           
               
               
           
         
         wherein A represents a metal nanoparticle; Z is a hydrophilic functional group or hydrophobic functional group; and m and n each represent an integer 1 or larger. 
       
     
     
         2 . The magnetic-cored dendrimer according to  claim 1 , wherein m is an integer of 1 to 5. 
     
     
         3 . The magnetic-cored dendrimer according to  claim 1 , wherein A is an iron nanoparticle having a crystal form of magnetite (Fe 3 O 4 ) or maghemite (γ-Fe 2 O 3 ). 
     
     
         4 . The magnetic-cored dendrimer according to  claim 1 , wherein Z is a hydrophilic functional group selected from the group consisting of —NH 2 , —OH, —COOH and —SH. 
     
     
         5 . The magnetic-cored dendrimer according to  claim 1 , wherein Z is a hydrophobic functional group selected from —C 6 H 6  and —CH 3 . 
     
     
         6 . The magnetic-cored dendrimer according to  claim 1 , which is represented by one of the following Chemical Formulae (2) to (4): 
       
         
           
           
               
               
           
         
       
     
     
         7 . A method for preparing a magnetic-cored dendrimer end-capped with NH 2  groups and represented by the Chemical Formula (2) of  claim 6  according to the following Reaction Scheme 1: 
       
         
           
           
               
               
           
         
       
     
     
         8 . A method for preparing a magnetic-cored dendrimer end-capped with SH groups and represented by the Chemical Formula (3) of  claim 6  according to the following Reaction Scheme 2: 
       
         
           
           
               
               
           
         
       
     
     
         9 . A method for preparing a magnetic-cored dendrimer end-capped with CH 3  groups and represented by the Chemical Formula (4) of  claim 6  according to the following Reaction Scheme 3: 
       
         
           
           
               
               
           
         
       
     
     
         10 . A method for separating hydrophilic or hydrophobic contaminants using the magnetic-cored dendrimer as defined in  claim 1 , comprising:
 allowing the contaminants to be adsorbed on the magnetic-cored dendrimer; and   separating the magnetic-cored dendrimer having the contaminants adsorbed thereon by using a magnet.   
     
     
         11 . The method according to  claim 10 , wherein the hydrophilic or hydrophobic contaminants are heavy metals. 
     
     
         12 . The method according to  claim 10 , wherein the heavy metals comprise cadmium. 
     
     
         13 . The method according to  claim 12 , wherein the separation of cadmium is carried out in a solution at a pH of 4 or higher. 
     
     
         14 . The method according to  claim 10 , wherein the magnetic-cored dendrimer having the contaminants adsorbed thereon is treated at a pH lower than 4 so that the contaminants are desorbed from the magnetic-cored dendrimer, and the magnetic-cored dendrimer is reutilized for separating contaminants.