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Degradation of polyamide nanofiltration and reverse osmosis membranes by hypochlorite.

หน่วยงาน Nanyang Technological University, Singapore

รายละเอียด

ชื่อเรื่อง : Degradation of polyamide nanofiltration and reverse osmosis membranes by hypochlorite.
นักวิจัย : Do, Van Thanh. , Tang, Chuyang Y. , Reinhard, Martin. , Leckie, James O.
คำค้น : DRNTU::Engineering::Civil engineering. , DRNTU::Engineering::Environmental engineering.
หน่วยงาน : Nanyang Technological University, Singapore
ผู้ร่วมงาน : -
ปีพิมพ์ : 2555
อ้างอิง : Do, V. T., Tang, C. Y., Reinhard, M., & Leckie, J. O. (2012). Degradation of polyamide nanofiltration and reverse osmosis membranes by hypochlorite. Environmental science & technology, 46(2), 852-859. , http://hdl.handle.net/10220/16241 , http://dx.doi.org/10.1021/es203090y
ที่มา : -
ความเชี่ยวชาญ : -
ความสัมพันธ์ : Environmental science & technology
ขอบเขตของเนื้อหา : -
บทคัดย่อ/คำอธิบาย :

The degradation of polyamide (PA) nanofiltration and reverse osmosis membranes by chlorine needs to be understood in order to develop chlorine-resistant membranes. Coated and uncoated fully aromatic (FA) and piperazine (PIP) semi-aromatic PA membranes were treated with hypochlorite solution and analyzed by X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared (FTIR). XPS results showed that in chlorine treated FA PA membranes the ratio of bound chlorine to surface nitrogen was 1:1 whereas it was only 1:6 in the case of PIP PA membranes. Surface oxygen of uncoated FA and PIP membranes increased with increasing hypochlorite concentration whereas it decreased for coated FA membranes. High resolution XPS data support that chlorination increased the number of carboxylic groups on the PA surface, which appear to form by hydrolysis of the amide bonds (C(O)–N). FTIR data indicated the disappearance of the amide II band (1541 cm–1) and aromatic amide peak (1609 cm–1) in both coated and uncoated chlorinated FA membranes, consistent with the N-chlorination suggested by the XPS results. Furthermore, the surface charge of chlorinated membranes at low pH (<6) became negative, consistent with amide-nitrogen chlorination. Chlorination appeared to both increase and decrease membrane hydrophobicity depending on chlorination exposure conditions, which implied that N-chlorination and hydrolysis may be competing processes. The effects of property changes on the membrane performance were also observed for NF90, BW30, and NF270 membranes.

บรรณานุกรม :
Do, Van Thanh. , Tang, Chuyang Y. , Reinhard, Martin. , Leckie, James O. . (2555). Degradation of polyamide nanofiltration and reverse osmosis membranes by hypochlorite..
    กรุงเทพมหานคร : Nanyang Technological University, Singapore.
Do, Van Thanh. , Tang, Chuyang Y. , Reinhard, Martin. , Leckie, James O. . 2555. "Degradation of polyamide nanofiltration and reverse osmosis membranes by hypochlorite.".
    กรุงเทพมหานคร : Nanyang Technological University, Singapore.
Do, Van Thanh. , Tang, Chuyang Y. , Reinhard, Martin. , Leckie, James O. . "Degradation of polyamide nanofiltration and reverse osmosis membranes by hypochlorite.."
    กรุงเทพมหานคร : Nanyang Technological University, Singapore, 2555. Print.
Do, Van Thanh. , Tang, Chuyang Y. , Reinhard, Martin. , Leckie, James O. . Degradation of polyamide nanofiltration and reverse osmosis membranes by hypochlorite.. กรุงเทพมหานคร : Nanyang Technological University, Singapore; 2555.