Preparation of Adsorptive Fiber by a Combination of Peroxo Complex of Titanium Anion and DMAPAA-Grafted Fiber for the Removal of Strontium from Seawater

Abstract

In order to remove strontium from seawater, sodium titanate was impregnated onto a commercially available 6-nylon fiber by means of radiation-induced graft polymerization and subsequent chemical modifications. First, dimethyaminopropyl acrylamide as an originally anion-exchange-group-containing vinyl monomer was graft-polymerized onto the electron-beam-irradiated nylon fiber, followed by binding of a peroxo complex of titanium anions to the anion-exchange group of the graft chain. Then, bound titanium species were converted into insoluble sodium titanate through a reaction with sodium hydroxide. The equilibrium binding capacity of the sodium-titanate-impregnated fiber for strontium in seawater was calculated as 1.7 mg/g-Sr of the fiber from Langmuir adsorption isotherm.