Silica-incorporated molecularly imprinted polymers for removal of acid black ATT via solid-phase extraction

초록

Silica-incorporated molecular imprinted polymer (SiO2@MIP) was synthesized via bulk polymerization using methacrylic acid (MAA) as a functional monomer and acid black ATT as the template molecule, while the corresponding non-imprinted polymer (SiO2@NIP) was prepared in the absence of the template. The polymer was characterized via SEM, FTIR, EDX, and XRD. The effect of contact time, pH, temperature, and initial dye concentration was optimized. The adsorption mechanism followed the pseudo-second order kinetic (K2 = 0.0028 mg g-1) model. The values of (triangle H & ring; = -12.7486 kJ/mol), and (triangle S & ring; = - 12.749 J/mol) suggested that the adsorption of acid black ATT is a spontaneous exothermic process. The MIP was evaluated as the solid phase extraction media with very good results owing to its striking features such as mechanical strength, selective adsorption with very high recyclability for the acid black ATT, ease of handling, and cost effectiveness contributing to green chemistry. The silica-incorporated MIP polymer networking proved very effective in the overall adsorption characteristics of the resultant material. The resultant MIP was applied for the removal of dyes from spiked water samples (tap water, river water, and distilled water) with adsorption higher than 90%.

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