Adsorption characteristics of anionic nutrients onto the PP-g-AA-Am non-woven fabric prepared by photoinduced graft and subsequent chemical modification.
PP-g-AA-Am non-woven fabric, which possesses anionic exchangeable function, was prepared by chemical modification of carboxyl group in PP-g-AA non-woven fabric to amine group using diethylene triamine. Its sorption characteristics for anionic nutrients including isotherm, kinetics, effects of pH and co-anions, and regeneration efficiency were studied by batch sorption experiments. Sorption equilibriums of PO(4)-P on PP-g-AA-Am fabric were well described by the Langmuir isotherm model, and their sorption energies were ranged between 9.94 and 15.96 kJ/mol indicating an ion exchange process as primary sorption mechanism. Sorption kinetic data fitted with pseudo-second-order kinetic model and indicated that both external and intraparticle diffusion took part in sorption processes. The uptake of PO(4)-P by PP-g-AA-Am fabric increased with increasing pH of solution and its optimum pH region was in pH >or=4, whereas the uptake of NO(3)-N and NO(2)-N was higher in weak and strong acidic pH region, respectively. The sorption selectivity for anions by PP-g-AA-Am fabric was increased in the order: SO(4)>or=PO(4)>NO(3)>Cl. The PP-g-AA-Am fabric could be regenerated by a simple acid washing process without lowering the sorption capacity or physical durability.
Park
Hyun-Ju
HJ
Department of Environmental Engineering, Mokpo National University, Jeonnam 534-729, South Korea.
Na
Choon-Ki
CK
D000179:Acrylates / Q000737:chemistry*; D000327:Adsorption; D000838:Anions / Q000302:isolation & purification*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D010710:Phosphates / Q000302:isolation & purification*; D055668:Photochemical Processes; D011126:Polypropylenes / Q000737:chemistry*; D013784:Textiles; D013816:Thermodynamics
D000179:Acrylates; D000838:Anions; D010710:Phosphates; D011126:Polypropylenes; C036658:acrylic acid