Lead Ion Removal Characteristics of Poly(lactic acid)/Hydroxyapatite Composite Foams Prepared by Supercritical CO2 Process
- Authors
- Jeon, Byung Jin; Jeong, Young Gyu; Min, Byung Gil; Lyoo, Won Seok; Lee, Sang Cheol
- Issue Date
- Sep-2011
- Publisher
- WILEY-BLACKWELL
- Citation
- POLYMER COMPOSITES, v.32, no.9, pp.1408 - 1415
- Journal Title
- POLYMER COMPOSITES
- Volume
- 32
- Number
- 9
- Start Page
- 1408
- End Page
- 1415
- URI
- https://scholarworks.bwise.kr/kumoh/handle/2020.sw.kumoh/19218
- DOI
- 10.1002/pc.21164
- ISSN
- 0272-8397
- Abstract
- We have prepared a series of poly(lactic acid)/hydroxyapatite (PLA/HAp) composite foams by a supercritical CO2 foaming process and investigated the lead ion (Pb2+) removal performances of the foam samples in batch aqueous solutions (foam sample of 5 g, aqueous solution of 500 ml, initial Pb2+ ion concentration of 275 mg/l, pH values of 2.0-6.0) at 25 degrees C. It is characterized that the porosity of the foams decreases from 96.3% to 50.3% as the HAp content increases from 0 to 40 wt%, although all the foam samples exhibit well-developed open porous structures. The maximum capacity of Pb2+ ions removed by the composite foams increases from 81.2 to 140.5 mg/g with increasing the HAp content from 10 to 40 wt%, due to the increased adsorption sites of HAp for Pb2+ ions. However, the removal kinetic analysis based on the pseudo-second order model demonstrates that the Pb2+ ion removal rate is slightly faster for the composite foams with higher porosity (i.e., lower HAp content). The maximum Pb2+ ion removal capacity of a given composite foam increases from 20.2 to 140.5 mg/g with increasing the initial pH value from 2.0 to 5.0 but it decreases slightly to 111.7 mg/g at the initial pH value of 6.0. POLYM. COMPOS., 32: 1408-1415, 2011. (C) 2011 Society of Plastics Engineers
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