Preparation of sodium titanium silicate-impregnated fiber and its strontium removal performance from seawater

To raise the adsorption capacity of the adsorptive fiber for strontium ions in seawater, sodium titanium silicate was impregnated onto an anion-exchange fiber. Peroxotitanium complex anions were immobilized onto N, N-dimethylaminopropylacrylamide (DMAPAA)-grafted nylon-6 fiber, followed by a reaction with sodium orthosilicate. The resultant fiber exhibited a strontium removal percentage of 83% and a selectivity of Sr to Ca of 4.3 in artificial seawater, which were 1.1- and two-fold, respectively, higher than those of the sodium-titanate-impregnated fiber. (author)