Synthesis and characterization of triazine‐based dendrimers and their application in metal ion adsorption

Abstract

This article described the synthesis of triazine-based dendrimers with poly(ethylene glycol) core by convergent method. Compound 1 was prepared by coupling of amino group of diethanolamine with cyanuric chloride in dry THF (tetrahydrofuran). Reaction of compound 1 with p-aminobenzylamine resulted in compound 2. Compound 4 was synthesized using coupling reaction of amino group of compound 2 with cyanuric chloride, then coupling of amine groups of p-aminobenzylamine with compound 3 in the hybrid solvents. The final dendrimer (den-OH) were synthesized using reaction of dendron 4 with compound 5. Ethylene diaminetetraacetic acid modified final dendrimer were successfully prepared via coupling ethylene diaminetetraacetic acid dianhydride and den-OH. The growth of dendrons and their structures were investigated by using usual spectroscopy methods and elemental analysis. The chelating behavior and sorption capacities of triazine dendrimers were determined in relation to pH dependency for some metal ions such as Cu þ2 , Ni þ2 , and Zn þ2 using atomic absorption methods.

Designing of Triazine Based Dendrimer and its Application in Removal of Heavy Metal Ions from Water

“…For all the dendrimer generations, metal ion adsorption increased with increase in pH. At higher pH values protonation of ligands decreases which leads to higher metal adsorption 26 . For all metals adsorption was maximum at 10 pH.…”

“…Polyamidoamine dendrimers were to bind Cu(II) ions from water and recovered Cu(II)ions from water using dendrimer mediated ultrafiltration [23][24] . Recently many groups have described extensive studies on the removal of heavy metal ions from water using dendrimer [25][26][27] .…”

“…A very little shift is observed for C-O at 1064 cm -1 and C-H at 2848 cm -1 from the parent G3 dendrimer. So it was revealed that surface hydroxyl group may be the active binding site for metal ions adsorption 26 . The thermal degradation analyses of the prepared pure and metal containing dendrimer were performed by TGA instrument with heating rate of 10˚C min -1 in an N 2 atmosphere.…”

Computational study of the complexation of metals ions with poly(amidoamine) PAMAM G0 dendrimers

“…Among available chelating agents, hyper-branched polymers have been reported as an effective technology to encapsulate metals that can be easily recovered and recycled to reuse [12,13]. Poly(amidoamine) (PAMAM) type dendrimers exhibit an excellent capability to bind metal ions and form stable coordination complexes [14,15].…”

Facile Synthesis of Dendritic Hydroxyl‐terminated Cyanuric Chloride Derivatives and Their Properties

“…[10][11][12][13][14][15][16][17][18][19][20][21][22][23][24] Cyanuric chloride was also popularly applied in installing functional moieties to the macromolecular backbone or material surface by coupling, bridging and cyclizing reactions. [25][26][27][28][29][30][31] Moreover, the controlled reactivity of the three chloride atoms in cyanuric chloride was found very valuable in dendrimer synthesis, [32][33][34][35][36][37][38][39][40][41][42] which can omit deactivation-activation or protection-deprotection steps and facilitate the dendrimer preparation. Hydroxyl is one of the well known functional groups and can offer hydrophilism, reactivity and chelating site.…”