Template Synthesis of Iminodiacetic Acid Polysiloxane Immobilized Ligand Systems and their Metal Uptake Capacity

Abstract

Porous solid polysiloxane ligand systems bearing an iminodiacetic acid chelating ligand of the general formula P-IDA (where P-represents [Si-O] n polysiloxane network and IDA represent an organofunctional group) were achieved in a two-step reaction. The first step includes a template synthesis of 3-iodopropylpolysiloxane (P-I) or 3-aminopropylpolysiloxane (P-MA) by hydrolytic polycondensation of TEOS and the corresponding silane agent in the presence of CTAB as a surfactant. The second step includes a modification of 3-iodopropylpolysiloxane with diethyliminodiacetate or 3-aminopropylpolysiloxane with ethylchloroacetate to produce IDA-functionalized polysiloxane ligand systems P-IDA-I & P-IDA-II respectively. It was found that the modified IDA-functionalized polysiloxane ligand systems exhibited higher capacities for uptake of the metal ions (Ni 2+ , Cu 2+ and Pb 2+ ) than those prepared without surfactants.

Controllable preparation and performance of bio-based poly(lactic acid-iminodiacetic acid) as sustained-release Pb2+ chelating agent

“…From the results shown in Figure S12 , we come to know that with the increase of n (LA): n (IDA), the Pb 2+ chelating capacity of P(LA- co -IDA)s is gradually decreased from 1.80 mg·g −1 of IDA8 to 0.33 mg·g −1 of IDA128. The datum is similar to ( Tahtat et al., 2017 ; El-Ashgar et al., 2017 ) or higher than ( Liu et al., 2020 ; Blicharska et al., 2018 ) that of the reported polymeric (or M w over 1,200 Da) Pb 2+ chelators using IDA or other substances as functional groups. Importantly, this level of chelating capacity is suitable for a potential biomedical chelating agent as a treatment drug for chelating and removing lead ions in vivo because the threshold of lead poisoning that requires treatment is 10 μg·dL −1 ( Balasubramanian et al., 2020 ), and the corresponding dosage of small molecule chelating drugs is as low as 30 mg·kg −1 body weight per day ( Safi et al., 2019 ).…”

Synthesis of Silica-Salen Derivative from Rice Husk Ash and its Use for Extraction of Divalent Metal Ions Co(II), Ni(II) and Cu(II)

“…Preliminary experiments were conducted by Leyden and Lutterll [20] and Leyden et al [21] using amine, dithiocarbamate, and thioether derivatives for preconcentration process. Recently, this topic was a subject of extensive research, and a variety of functionalized silica compounds were prepared in order to extract or separate metal ions from aqueous solutions [6,11,[22][23][24][25].…”