Abstract
A process of phosphorylation for a mercerized cotton kersey fabric was investigated. After wet oxidation, the phosphorus content in each sample was determined by spectrophotometric analysis. The range was 0.179 to 0.950 mmol g–1. A significant decrease in the tensile strength of samples resulted from an increase of phosphoric acid concentration in the phosphorylating solution. The mercerization has a positive impact on the process of phosphorylation, as the phosphorus content was found to be three times higher in the samples that underwent mercerization. The sorption properties of phosphorylated cotton fabric were studied using the Cu2+ sorption process as a reference. The value of the static exchange capacity for the phosphorylated fabric was determined to reach its maximum when the concentration of the H3PO4 in the phosphorylating solution was 1.40 M, and was found to be 1.48 ± 0.11 mmol g–1 with the phosphorus content equal to 0.898 ± 0.090 mmol g–1. The sorption of Cu2+ by a single phosphorus-containing group occurred for samples with phosphorus content not exceeding 0.80 mmol g–1. The preliminary studies of micro-quantities of 241Am, 233U, and 239Pu radionuclide sorption from aqueous solutions with phosphorylated textile demonstrated the high efficiency.
Highlights
Cellulose is one of the most common natural linear syndiotactic homopolymers.Cellulose is formed by glucopyranose units linked through β-(1,4)-glycosidic bonds
Both external and structural changes were the results of the phosphorylation process of preliminary mercerized cotton cellulose
Even a low concentration (0.20 mol L–1 ) of H3 PO4 caused a decrease in the sample’s strength characteristics by almost two times (Figure 1; apparently, it was caused by the changes in the structures of the molecules and their partial destruction, which seemed to increase when increasing the phosphoric acid concentration in the phosphorylating solution)
Summary
Cellulose is one of the most common natural linear syndiotactic homopolymers.Cellulose is formed by glucopyranose units linked through β-(1,4)-glycosidic bonds. Due to the free hydroxyl groups being linked with a pyranose ring, it is possible to carry out chemical reactions typical for primary and secondary alcohols. When modifying cellulose by introducing new functional groups, one can achieve a cellulose-based compound with new properties and many possible applications. Phosphorus-containing groups are introduced and linked through covalent bonds to the cellulose molecule by treating it with phosphorus-containing compounds, such as P2 O5 , PCl5 , PCl3 , POCl3 , and H3 PO4 [3,5,14,15,16,17]. The studies focusing on the phosphorylation process of preliminary mercerized cotton fabric are relatively sparse. Preliminary mercerization of cellulose significantly increases its chemical activity in the etherification processes and improves sample wettability, associated with the sliding effect and smoothness of
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