Abstract
Soy lecithin (SL)-modified cellulose acetate (L-CA) fibers for use as a novel biomimic material were prepared by a dry-jet wet spinning process from a solution of the polymer in dioxin. Characteristics of the L-CA fibers, such as structural properties, water absorbance, electrical conductivity and accumulation of trace persistent organic pollutants (POPs), were examined. Cross-sectional scanning electron microscopy (SEM) of L-CA unveiled a finger-like structure, along with a thin dense surface layer like that of CA. On the basis of X-ray photoelectron spectroscopic (XPS) observations, it was concluded that the enhancement of binding energy was optimum with 10% SL in the fiber, whereas superfluous SL led to self-assembly between the SL molecules, which weakened the binding between the SL and CA. Also, the L-CA fibers showed good water absorbance and a low charge conductivity in comparison to that of the non-modified CA fibers. Examination of the ability to accumulate POPs from water showed that L-CA is a effective candidate for the removal of micropollutants from aqueous solution.
Highlights
In May 2009, parties to the Stockholm Convention on Persistent Organic Pollutants (POPs) agreed to add nine substances [1], to the 12 [2], already banned or restricted under the convention, which stimulated global efforts to eradicate these highly toxic chemicals from the environment
This study showed that the kinetics of accumulation of POPs on the lecithin (SL)-modified cellulose acetate (L-cellulose acetate (CA)) fiber is different for different types of POPs
A novel environment-friendly composite fiber with biomimic function was prepared for removing trace POPs heptachlor mirex endrin deldrin lindane
Summary
In May 2009, parties to the Stockholm Convention on Persistent Organic Pollutants (POPs) agreed to add nine substances [1], to the 12 [2], already banned or restricted under the convention, which stimulated global efforts to eradicate these highly toxic chemicals from the environment. (2015) Preparation and Characteristics of Novel Fibers Based on Cellulose Acetate and Soy Lecithin for Attracting and Binding POPs. Journal of Geoscience and Environment Protection, 3, 1-8. The physically embedded triolein retains its high capacity for the accumulation of POPs. there is a marked phase separation of triolein in the membrane. Phospholipids, unlike neutral triolein, are a class of lipids that contain two hydrophobic glycerides, a negatively charged phosphate group and a positively charged choline molecule. There are very few reports in the literature of phospholipid-containing materials being used for accumulating POPs. Lecithin contains a neutral diglyceride and a polar head, which allows lecithin to interact with the polar groups in polymers, while two free hydrophobic glyceride chains are used for accumulating POPs. It is possible that lecithin-containing materials are of greater stability and dispersity in a polymeric matrix than triolein-embedded materials. We used soy lecithin (SL) as a replacement for triolein and here we describe: (i) the preparation of fibers with different SL/CA ratios using a dry-jet wet spinning method [15]; (ii) a thorough characterization of the microstructure of L-CA fibers; (iii) the mechanism underlying the interaction between SL and CA; and (iv) electrical conductivity and the accumulation of POPs from water
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