Comparative studies on the solvent extraction of transition metal cations by calixarene, phenol and ester derivatives

Calix[4]arene‐Based n‐Dialkylamino Extractants for Selective Platinum Group Metal Separation from Automotive Catalysts

“…Calix[ n ]arenes, which are composed of phenol and methylene linking moieties, are bowl‐shaped structures . To them, we can introduce, in an orderly fashion, a variety of functional groups that possess high affinity for transition metals, PGMs, and rare earth metals . Calixarene‐based extractants have been widely used for the removal of heavy metal ions from aqueous solutions .…”

Synthesis of polyacrylonitrile-grafted cross-linked N-chlorosulfonamidated polystyrene via surface-initiated ARGET ATRP, and use of the resin in mercury removal after modification

“…Many researchers have studied the synthesis or modification of polymeric materials using different methods to overcome the difficulties involved in wastewater treatment processes [1,2]. In addition, many approaches based upon adsorption, solvent extraction and polymeric membranes have been used to remove metal ions from aqueous solutions [3][4][5][6]. Among all studied methods, the approach based upon adsorption is considered most attractive because it is an effective and relatively simple method for the removal of heavy metal ions.…”

Transition metal cations extraction by ester and ketone derivatives of chromogenic azocalix[4]arenes

“…These calix[n]arenes bear phenoxy and carbonyl oxygens as the ligating sites, and include vic-dioximes [8,9], hydroxamates [10], amides [11], carboxylic acids [12], esters [13], and ketones [14]. In spite of many of these studies had been carried out on extraction/complexation of Fe 3+ , data on other transition metal cations were also found [15][16][17].…”