Calcium carbonate (CaCO3) is a well-known chemical adsorbent. In this study, anthraquinone dye adsorption by CaCO3-mineralized nanofibers was evaluated with respect to the chemistry and structure of ionic particles that were seeded into the fibers. Reacted and unreacted surfmers of polyoxyethylene-1-(alkyloxylmethyl) alkyl ether sulfuric ester ammonium salt (PAMS) and polyoxyethylene alkylphenyl ether ammonium sulfate (PAPS) were added to aqueous poly(vinyl alcohol) (PVA) solutions at concentrations above their critical micelle concentration prior to electrospinning. The roles of these polymerized micelles on CaCO3 mineralization (produced by dipping PVA nanofibers into alternating solutions of aqueous CaCl2 and NaCO3) were compared to the roles of calcium chloride (CaCl2) and unseeded PVA nanofibers. Seeding nanofibers with reacted PAMS and PAPS resulted in higher degrees of CaCO3 mineralization than those with unreacted surfmers. PAPS caused even greater degrees of CaCO3 mineralization than other seeds, including PAMS. Likewise, dye absorption was greatest among the vaterite CaCO3 containing surfaces that were along nanofibers seeded with PAPS. Complexation between the PAMS and PVA hydroxyl groups had reduced their ability to attract calcium ions to the surfaces of nanofibers for mineralization, which also suppressed dye adsorption.
Bibliographical noteFunding Information:
Work from Project 14-177 NC with the Nonwoven Institute was featured in this study. This work was performed, in part, at the Analytical Instrumentation Facility (AIF) at North Carolina State University which is supported by the State of North Carolina and the National Science Foundation (Award ECCS-1542015). AIF is a member of the North Carolina Research Triangle Nanotechnology Network, a site in the National Nanotechnology Coordinated Infrastructure. We appreciate Monticello Inc. for the kind donation of polymerizable surfactants. Dr. Cynthia Spencer at Brunswick Community College is acknowledged for her recommendations for particle synthesis and NMR analysis. DLS was performed in Dr. Orlin Velev's laboratory and assisted by Sangchul Roh in Chemical and Biomolecular Engineering at North Carolina State University.
© 2017 American Chemical Society.
All Science Journal Classification (ASJC) codes
- Chemical Engineering(all)
- Industrial and Manufacturing Engineering