Synthesis of molecularly imprinted polymer for removal of Congo red

Abstract

Congo red (CR) is an anionic azo dye widely used in many industries including pharmaceutical, textile, food and paint industries. The disposal of huge amount of CR into the various streams of water has posed a great threat to both human and aquatic life. Therefore, it has become an important aspect of industries to remove CR from different water sources. Molecular imprinting technology is a very slective method to remove various target pollutant from environment. In this study a precipitation polymerization was employed for the effective and selective removal of CR from contaminated aqueous media. A series of congo red molecularly imprinted polymers (CR-MIPs) of uniform size and shape was developed by changing the mole ratio of the components. The optimum ratio (0.1:4: 20, template, functional monomer and cross-linking monomer respectively) for CR1-MIP from synthesized polymers was able to rebind about 99.63% of CR at the optimum conditions of adsorption parameters (contact time 210 min, polymer dosage 0.5 g, concentration 20 ppm and pH 7). The synthesized polymers were characterized by various techniques such as Fourier Infra-red spectroscopy (FTIR), scanning electron microscopy (SEM), Thermogravimetric analysis (TGA), energydispersive X-ray spectroscopy (EDX), and Brumauer-Emmett-Teller (BET). The polymer particles have successfully removed CR from different aqueous media with an efficiency of about ~ 90%.

Synthesis and characterization of a molecularly ımprinted polymer adsorbent for selective solid-phase extraction from wastewater of propineb

“…The peaks at ~ 2900 cm −1 are due to C-H stretching vibrations found in propineb, methacrylic acid, and EGDMA, and ~ 2995 cm −1 is the stretching vibrations of = C-H. Strong peaks at ~ 1720 cm −1 suggest the presence of -COOH of methacrylic acid. In addition, ~ 1635 cm −1 , ~ 1440 cm −1 , ~ 1300 cm −1 and ~ 1200 cm −1 peaks correspond to the presence of C=C stretching, -CH 2 stretching, CH 3 group and C-O stretching, respectively [32,33]. The similarity of the spectra of the post-extraction NIP and MIP indicates that the polymerization procedure was carried out successfully [34].…”

Design of molecularly imprinted polymer materials relying on hydrophobic interactions

“…The distribution ratio of SiO2@LMAC2MIP-3 towards Mit was evidently higher than the distribution ratios of interfering molecules. This suggests that the migration of Mit to specific binding sites of the imprinted polymer is more favorable, resulting in a more favorable adsorption of Mit compared to its structural analogs [60]. In the case of SiO2@LMAC2MIP-3, the values of selectivity coefficient α with respect to Mit were high.…”

Factors affecting the analytical performance of molecularly imprinted mesoporous silica

“…However, the use of high‐functional monomer concentrations does not always result in good analytical performance due to an increase in the nonspecific affinity of the sorbent. The addition of an excessive amount of functional monomer may cause functional molecules to self‐associate, resulting in a reduction in the formation of binding sites on the sorbent 59 . Therefore, it is necessary to optimize functional monomer concentrations to produce MIP‐MS with good analytical performance.…”

“…The addition of an excessive amount of functional monomer may cause functional molecules to self-associate, resulting in a reduction in the formation of binding sites on the sorbent. 59 Therefore, it is necessary to optimize functional monomer concentrations to produce MIP-MS with good analytical performance. Table 3 presents the effect of the functional monomer type and concentration on analytical performance.…”