Modification of cellulose nanocrystal with dual temperature- and CO2-responsive block copolymers for ion adsorption applications
作者： Parvaneh Eskandari , Hossein Roghani-Mamaqani , Mehdi Salami-Kalajahi , Zahra Abousalman-Rezvani
DOI: 10.1016/J.MOLLIQ.2020.113234
关键词:
摘要: Abstract Cellulose nanocrystal (CNC)-grafted smart polymers have potential applications as adsorbents by providing simple regeneration process. In this study, carbon dioxide (CO2)- and temperature-responsive free block copolymers of N-isopropylacrylamide (2-dimethylaminoethyl) methacrylate with different lengths were synthesized using reversible addition-fragmentation chain transfer (RAFT) polymerization. addition, CNC was modified the similar surface-initiated RAFT method. The used in nitrate ion removal from aqueous solutions. synthesis process confirmed Fourier-transform infrared spectroscopy, proton nuclear magnetic resonance (1H NMR) analysis, thermal gravimetric scanning electron microscopy, transmission microscopy. Stimuli-responsivity studied pH measurement, turbidity investigation, dynamic light scattering analysis. CO2-responsivity solution reduction presence CO2 protonation PDMAEMA blocks. higher length showed highly intense CO2-responsivity. Deprotonation units purging N2 represents responsivity copolymers. Turbidity analysis critical temperatures (CST) for various lengths. Two micellar vesicular morphologies observed self-assembled at above below CST copolymers, which is related to hydrophobic/hydrophilic ratio. CO2-switched adsorption two (37 60 °C) UV–vis spectroscopy products adsorbent. Adsorption ions solutions increased segments upon purging. Presence CNC, morphology temperature, time affect nitrite capacity. maximum capacity (420 mg/g) sample assemblies copolymer. resulted deprotonation blocks samples. Finally, substrate can be samples filtration addition stimuli-regeneration
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