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Creation of Multi-chemical surface functionalities on cellulose nanofiber
이호익 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
We demonstrate effective functionalization chemistry for cellulose nanofiber modification using thiol functionality. Electrospun cellulose acetate nanofibers were deacetylated to obtain cellulose nanofibers, which were modified further to incorporate thiol on their surface. The thiol functionality was highly versatile to bring simple and efficient chemical reactions to attain (ⅰ) Ag nanoparticle-adsorbed cellulose nanofibers by Ag ion reduction at surface, (ⅱ) various amine (primary amine and quaternary amine) functionalized cellulose nanofibers by Michael addition, and (ⅲ) complex polymer functionalized cellulose nanofibers by a radical-based thiol-ene reaction, under mild conditions. These scalable thiol-based chemistries should offer a new generation of well-tailored cellulose nanofiber materials with complex inorganic, organic, and polymeric functionalities, potentially expanding to functionalized surfaces of other carbohydrate-based materials to achieve the desired properties.
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Thiol-functionalized cellulose nanofiber membranes for the adsorption of heavy metal ions in water
이호익 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
This work reports the fabrication of a thiol-functionalized cellulose nanofiber that can effectively adsorb heavy metal ions. Thiol was incorporated onto the surface of cellulose nanofibers and subsequent esterification of a thiol precursor molecule. Adsorption mechanism was investigated using adsorption isotherms. Adsorption capacity as a function of adsorbate concentration was described well with Langmuir isotherm, suggesting that metal ions form a surface monolayer with a homogenously distributed adsorption energy.The time dependent adsorption capacities followed a pseudo-second-order kinetic model, suggesting that chemisorption of each doubly charged metal ion occurs with two thiol groups on the surface. These results highlight the significance of surface functionality on biocompatible and sustainable cellulose materials to expand their potential and applicability towards water remediation applications.
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