Water compatible functionalized chitosan-based 4-HBA mimic imprinted polymer as a potential sorbent for salicylic acid

An efficient acrylamide grafted chitosan (AGCTS)-based polymer (AGCTS-based mimic 4-hydroxy benzoic acid imprinted polymer [AGMIP]) was synthesized using 4-hydroxy benzoic acid as a mimic template for the recognition of salicylic acid (SA) in aqueous solution. The influence of grafting parameters on grafting percentage of AGCTS was studied. AGMIP was characterized by scanning electron microscopy, Fourier transform infrared spectrometer, and Brunauer-Emmett-Teller surface area analysis. Adsorption process could be well described by Langmuir and Temkin adsorption isotherm model and the maximum adsorption capacity calculated for SA was 62 mg/g. The adsorption kinetic data was fitted with pseudo-second order equation. The experimental results suggest that AGMIP is a promising adsorbent for SA. Abbreviations AGMIP: Acrylamide grafted chitosan-based mimic 4-hydroxy benzoic acid imprinted polymer; SA: salicylic acid; 4-HBA: 4-hydroxy benzoic acid; GA: gallic acid; 2,5-DBA: 2,5-dihydroxy benzoic acid; 4-HBACTSMIP: chitosan-based 4-hydroxy benzoic acid molecularly imprinted polymer; SACTSMIP: chitosan-based salicylic acid molecularly imprinted polymer; AGCTS: acrylamide grafted chitosan; AGMIPAE: acrylamide grafted chitosan-based mimic 4-hydroxy benzoic acid imprinted polymer after extraction; AGMIPBE: acrylamide grafted chitosan-based mimic 4-hydroxy benzoic acid imprinted polymer before extraction; COD: Chemical oxygen demand; PCA: Protocatechuic acid; APS: Ammonium persulphate.