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Design and synthesis of ice-templated PSA cryogels for water purification : towards tailored morphology and properties

หน่วยงาน Nanyang Technological University, Singapore

รายละเอียด

ชื่อเรื่อง : Design and synthesis of ice-templated PSA cryogels for water purification : towards tailored morphology and properties
นักวิจัย : Loo, Siew-Leng , Krantz, William B. , Lim, Teik-Thye , Fane, Anthony Gordon , Hu, Xiao
คำค้น : DRNTU::Engineering::Environmental engineering::Water treatment
หน่วยงาน : Nanyang Technological University, Singapore
ผู้ร่วมงาน : -
ปีพิมพ์ : 2556
อ้างอิง : Loo, S. L., Krantz, W. B., Lim, T. T., Fane, A. G., & Hu, X. (2013). Design and synthesis of ice-templated PSA cryogels for water purification: towards tailored morphology and properties. Soft Matter, 9, 224-234. , 1744-683X , http://hdl.handle.net/10220/11016 , http://dx.doi.org/10.1039/C2SM26859K
ที่มา : -
ความเชี่ยวชาญ : -
ความสัมพันธ์ : Soft matter
ขอบเขตของเนื้อหา : -
บทคัดย่อ/คำอธิบาย :

Hydrogels are capable of absorbing water several times their dry mass that subsequently can be released by the application of pressure, temperature change, or other external stimuli. As such, they offer promise for providing potable water in disaster relief applications. However, the swelling and mechanical properties of hydrogels need to be improved. The objectives of this study were (i) to demonstrate that the properties of poly(sodium acrylate) (PSA) cryogels can be tuned by modulating synthesis conditions such as freezing temperature, initial monomer and initiator concentrations, and crosslinker ratio, and (ii) to investigate the potential of PSA cryogels as an integral membrane for water purification in emergencies. PSA cryogels with a superfast swelling rate and a high degree of swelling that can withstand large compression strains were synthesized by conducting copolymerization reactions between N,N0- methylenebis(acrylamide) and sodium acrylate under subzero temperature conditions. The pore morphology was characterized using confocal laser scanning microscopy and scanning electron microscopy. It was shown that a lower freezing temperature and reduced initial monomer concentrations formed PSA cryogels with smaller more interconnected pores, while a higher initiator concentration in the “freezing before gelation” mode resulted in smaller pores. PSA cryogels with open interconnected pores had both a higher rate and degree of swelling, and high elasticity in response to compression. The separation efficiency of PSA cryogels was evaluated by determining turbidity removal over five operational cycles. The turbidity removal efficiency of the PSA cryogel having the highest swelling degree increased to 90% towards the fifth cycle. The water recovery during the five operational cycles ranged from 71 to 77% under a vacuum suction of 70 kPa (absolute pressure) for one minute. PSA cryogels having smaller average pore sizes were found to have higher turbidity removal efficiencies.

บรรณานุกรม :
Loo, Siew-Leng , Krantz, William B. , Lim, Teik-Thye , Fane, Anthony Gordon , Hu, Xiao . (2556). Design and synthesis of ice-templated PSA cryogels for water purification : towards tailored morphology and properties.
    กรุงเทพมหานคร : Nanyang Technological University, Singapore.
Loo, Siew-Leng , Krantz, William B. , Lim, Teik-Thye , Fane, Anthony Gordon , Hu, Xiao . 2556. "Design and synthesis of ice-templated PSA cryogels for water purification : towards tailored morphology and properties".
    กรุงเทพมหานคร : Nanyang Technological University, Singapore.
Loo, Siew-Leng , Krantz, William B. , Lim, Teik-Thye , Fane, Anthony Gordon , Hu, Xiao . "Design and synthesis of ice-templated PSA cryogels for water purification : towards tailored morphology and properties."
    กรุงเทพมหานคร : Nanyang Technological University, Singapore, 2556. Print.
Loo, Siew-Leng , Krantz, William B. , Lim, Teik-Thye , Fane, Anthony Gordon , Hu, Xiao . Design and synthesis of ice-templated PSA cryogels for water purification : towards tailored morphology and properties. กรุงเทพมหานคร : Nanyang Technological University, Singapore; 2556.