Ion cum molecularly dual imprinted polymer for simultaneous removal of cadmium and salicylic acid

Abstract

Ion cum molecularly dual imprinted polymer (DMIP) was synthesized for the simultaneous removal of salicylic acid (SA) and cadmium (Cd) by suspension polymerization method using chitosan (CTS) as functional polymer, epichlorohydrin as cross-linker, and 4-hydroxy benzoic acid (4HBA) as well as Cd as organic and inorganic templates, respectively. Use of the dummy template 4HBA during the synthesis of DMIP had the advantage of creating imprinted cavities in DMIP, which depicted good uptake for SA. Scanning electron microscopy and Fourier transform reported on the removal of both organic and inorganic pollutants simultaneously. Thus, attention needs to be given on developing more efficient method for removal of organic and inorganic pollutants simultaneously. 1-5In recent years, molecularly imprinting technique has gained much attention because it is a simple and convenient method to develop synthetic polymers showing high affinity towards the targeted analyte.It involves the formation of prepolymerisation complex between the template and functional monomer through covalent or noncovalent interaction in the presence of cross-linking agent. After polymerisation, template molecule is removed using suitable extracting solvent leaving behind memory sites that are complementary to template molecule. 6-10The super cross-linked nature of molecularly imprinted polymers (MIPs)imparts it high physical and chemical stability. In addition, MIPs can be reused without remarkable decrease in their binding capacity. 10-12Ion imprinting technique is a branch of MIP, widely used for synthesizing materials that are capable of recognizing metal ions. Ion imprinted polymers are highly cross-linked polymers synthesized in the presence of metal ion as the template. The template ion is then subsequently removed to get the ion imprinted polymers showing high selectivity towards targeted metal ion. 13,14Dual template imprinting can have several advantages over the conventional technique involving single template. Conventional

Molecularly Imprinted Polymers for Removal of Metal Ions: An Alternative Treatment Method

“…Rahangdale et al [16] reported a study about molecularly dual imprinted polymeric material for the removal of cadmium by suspension polymerization. Scanning electron microscopy, swelling study and Fourier transform infrared spectroscopy indicated successful polymerization of the dual-ion imprinted polymeric material.…”

“…The polymers are prepared in the presence of the ions. When the template is removed, specific cavities show high selectivity to the desired metal ion [16,17]. Studies on metal ion-imprinted polymers have been increasing over the years as shown in Figure 1.…”

Kinetics and Mechanism of Photoconversion of N-Substituted Amides of Salicylic Acid

“…It is known that salicylic acid and its derivatives in organic aprotic solvents form both intramolecular and intermolecular hydrogen bonds between the phenolic hydroxyl and the neighboring carbonyl group [13][14][15][16]. We note that the intramolecular hydrogen bond is predominantly formed at low concentrations and the intramolecular hydrogen bond at high concentrations [14][15][16]. During the presence of an intramolecular hydrogen bond in salicylic acid, the stability of monomeric complexes was confirmed by molecular modeling.…”

“…During the presence of an intramolecular hydrogen bond in salicylic acid, the stability of monomeric complexes was confirmed by molecular modeling. A comparative analysis of IR spectra of salicylic and acetylsalicylic acids and methyl salicylate showed that the absorption band of OH groups participating in intramolecular hydrogen bond is 3230 cm À1 and the complex spectrum in the range 2500-3300 cm À1 characterizes the absorption of dimers [14][15][16][17]. The mechanism of formation of dimeric products from an intermediate reactive compound obtained as a result of disproportionation is discussed [17].…”

Sensors Based on Molecularly Imprinted Polymers

“…The drug had affinity to the MIP and it was released from the matrix due to ambient conditions where pH played a crucial role. In a work by Rahangdale and coworkers, chitosan was stabilized by crosslinking using epichlorohydrin [43]. Salicylic acid and cadmium were imprinted into the membrane and it exerted a binding capacity 38 respective 24 mg/g for cadmium respective salicylic acid.…”