Synthesis, characterization, and metal ions adsorption properties of chitosan–calixarenes (I)

Abstract

Calixarene-modified chitosans (CTS-CA-I and CTS-CA-II) were first synthesized by the reaction of chitosan (CTS-NH 2 ) with 1,3-bis-chloroethoxyethoxy-2,4-dihydroxy-p-tert-butylcalix[4]arene (CA-I) or its benzoyl derivative (CA-II). Their structures were characterized by infrared and X-ray diffraction spectroscopy and scanning electron microscopy (SEM).

Calix[4]arenes Used as a New Type of Chain Extender in the Preparation of Polyurethanes

“…Various attempts have been undertaken to incorporate calixarenes into different polymers. Most of the polymers have calixarene units in the side chain as pendants, [6][7][8][9][10] and a few contain them in the backbone. [11][12][13] It appeared that calixarene insertion in a polymer chain might give rise to new materials where the intrinsic properties of the macrocycle were enhanced.…”

Adsorption Study of Pb(II), Cd(II), Hg(II) And Cr(III) Onto Calix[4]Resorcinarene Derivative

“…Various adsorbent has been reported in the removal of heavy metal ions. For instance, activated carbon 8 , zeolite 9 , polymer 10 , biosorbent 11 and macrocycle [12][13][14][15] .…”

Preparation of p-tert[(dimethylamino)methyl]-calix[4]arene functionalized aminopropylpolysiloxane resin for selective solid-phase extraction and preconcentration of metal ions

“…Calixarenes, which can be prepared by the ring-closing condensation of p-tert-butyl phenol and formaldehyde under alkaline conditions, are such cyclic oligomers composed of phenol units and are very well known as attractive and excellent ionophores because they provide a unique three-dimensional structure with almost unlimited derivatization possibilities [14,15]. Accordingly, calixarenes and its derivatives exhibit outstanding complex ability toward ions and organic molecules [16,17]. There are several recent reports for the applications of functionalized calixarenes or its derivatives for enrichment of metal ions, for instance, calix [4]arene tetraethyl ester and calix [6]arene hexaethyl ester were incorporated onto the surface of silica particles after hydrosilylation of the p-allyl calixarenes and were used as selective adsorbents for Na (I) ions [18,19].…”