Rinkesh Patel

Removal of heavy metal ions from water by Hydroxyl terminated Triazine-based Dendrimer

AbstractWaste water containing heavy metal ions is being discharged from numerous industries and can cause several problems due to high toxicity and water solubility. It is crucial to treat metal containing water before discharging into the environment. Dendrimers are a new class of macromolecules. Due to their dense terminal functionality and internal cavities, they are perfect for water remediation by adsorption. In this paper, we have synthesized hydroxyl terminated triazine-based dendrimer generations by divergent method using piperazine, triazine trichloride and diethanolamine as starting materials. Full generation dendrimers G1(OH)8, G2(OH)32 and G3(OH)128 were terminated by 8, 32 and 128 hydroxyl groups, respectively. Structures of dendrimer generations were characterized by infrared spectroscopy (FT-IR), 1H NMR, 13C NMR, and electrospray ionization mass spectrometry. Hydroxyl terminated full dendrimers G1(OH)8, G2(OH)32 and G3(OH)128 were used as adsorbents in a series of experiments to study the ...

Designing, characterization, and thermal behavior of triazine-based dendrimers

Abstract Different generations of dendritic architecture with piperazine in core moiety and hydroxyl groups on the periphery were designed by divergent method. 1,4-biz(4,6-trichloro-1,3,5-triazin-2-yl)piperazine was synthesized as a core for dendrimer synthesis. Dendrimer was then grown to G3 from core compound using diethanolamine and cyanuric chloride as branching units. Dendrimer generations were characterized by infrared (IR) spectroscopy [Fourier transform IR (FTIR)], 1H-nuclear magnetic resonance (NMR), 13C-NMR, electrospray ionization-mass spectrometry (ESI-MS), and elemental analysis. The thermal behavior of both full- and half-generation dendrimers was investigated by thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). The TGA study revealed that dendrimer generations had a moderate thermal stability. Chlorine-terminated half-generation dendrimers were thermally more stable than hydroxyl-terminated full-generation dendrimers. The DSC technique was employed to determine the glass transition temperatures (Tg) of dendrimer generations. It was observed that the glass transition temperatures of synthesized dendrimer generations were of low value, which is similar to the values reported for the polyamidoamine (PAMAM) dendrimer of the same generation. It was also observed that, with the increase in the molecular weight or generation number of dendrimer, the glass transition temperature was also increased.