Amino-functionalised silica-grafted molecularly imprinted polymers for chloramphenicol adsorption. Issue 5 (October 2020)

• Record Type: Journal Article
• Authors: Mohamed Idris, Z.; Hameed, B.H.; Ye, L.; Hajizadeh, S.; Mattiasson, B.; Mohd Din, A.T.
• Is Part Of: Journal of environmental chemical engineering. Volume 8:Issue 5(2020)
• Publication Date: 2020-10
• Subjects: Molecularly imprinted polymer -- Precipitation polymerisation -- Adsorption -- Chloramphenicol -- Emerging contaminant; Chemical engineering -- Environmental aspects -- Periodicals; Environmental engineering -- Periodicals; Chemical engineering -- Environmental aspects; Environmental engineering; Periodicals; 660.0286
• DOI: 10.1016/j.jece.2020.103981
• Languages: English
• ISSNs: 2213-2929

Abstract

Graphical abstract: Highlights: Silica-grafted MIPs were prepared via precipitation polymerization method. Intra-particle diffusion is not the predominant step in CAP adsorption. Favorable imprinting factor and removal of CAP was observed on silica-grafted MIPs. Abstract: This research investigated the liquid-phase removal of chloramphenicol (CAP), an emerging contaminant using molecularly imprinted polymers (MIPs). CAP adsorption profiles, equilibrium, and kinetics were analysed. The adsorption performance was compared between MIPs and non-imprinted polymers (NIPs), both with silica or without silica grafting. The imprinting factor (IF) values for the Si@MIPs-CAP were significantly higher than the IF values for MIPs-CAP adsorbent at pH 8. The kinetics of CAP adsorption was fitted to pseudo-second-order kinetics models for MIPs-CAP ( R 2 = 0.9998) and Si@MIPs-CAP ( R 2 = 0.9999). The adsorption isotherm of Si@MIPs-CAP was well represented by the Langmuir model ( R 2 = 0.9991), while the Freundlich isotherm model ( R 2 = 0.9998) provided the best fit for MIPs-CAP. The maximum monolayer adsorption capacities, Qmax, for Si@MIPs-CAP (32.26 mg g −1 ) were higher than the Qmax for Si@NIPs-CAP (29.6 mg g −1 ). These results suggested that the silica-grafted molecularly imprinted polymers can be employed as a potential water-compatible adsorbent for the selective adsorption and removal of CAP from aqueous phase.