Abstract
Acrylic acid was grafted with polypropylene non-woven fabric using photoinduced polymerization technique to make the polymer adsorbent for removal NHs-N from waste water. Acrylic acid grafting polypropylene(PP-g-AA) non-woven fabrics could be synthesized in various degree of graft ranging from 10wt.% to 300wt.% under the following conditions: acylic add 5-10vo1.%, photo-irradiation time 60-130min. and reaction temperature 50-60'C. PP-g-AA nonwoven fabric showed the maximum adsorption capacity of NH3-N at the degree of grafting of 80wt.%. The adsorption capacity of NH3-N on the PP-g-AA non-woven fabric was affected by the initial pH of solution and the associated anion species with NH4 ion such as OH, Cl NO3, CH3COO and S04, but not by coexisting general cations such as K ion. It was significantly higher in NH4OH type than in the other anion types even under the similar pH condition, but in the other anion types, increased with increasing initial pH of solution, indicating the NH3-N adsorption behavior of PP-g-AA non-woven fabric that NH3 is more selective than NH4. The initial pH of solution decreased in proportion to the adsorption amount of NH3-N, even to lower than pH 4. Considering the occurrence phases of NH3-N in the solution depending on the pH, these adsorption behaviors.