کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7043753 | 1456918 | 2018 | 41 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Study on the effects of cations and anions on the removal of perfluorooctane sulphonate by nanofiltration membrane
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
تصفیه و جداسازی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Previously, the nanofiltration (NF) membrane has been applied to remove perfluorooctane sulphonate (PFOS), a persistent pollutant from drinking water by our group. However, the effects of co-existence ions on the PFOS removal have not been systematically studied. For instance, cations such as Ca2+ and Fe3+ are found to coordinate with -SO3 groups of PFOS molecule and subsequently influence the rejection properties of NF membrane. In this study, a commercial NF membrane (ESNA1-K1) was utilized to separate PFOS compounds in the existence of three cations including Na+, Ca2+ and Fe3+, as well as three anions including Clâ, SO42â and PO43â. The PFOS rejection increased from 92.65% to 94.74%, 97.14%, and 97.94%, respectively, with 2â¯mM Na+, Ca2+ and Fe3+, respectively. As the concentrations of anions including SO42â and PO43â increased to 2â¯mM, the PFOS rejection increased to 94.74% and 97.60%, respectively. The density functional theory (DFT) was applied to analyze the interaction between three different cations with PFOS molecule. It indicated that one Na+ ion could only bind with one PFOS molecule, but every Ca2+ or Fe3+ ion preferred to coordinate with two PFOS molecules. Based on the analysis results of the NF membranes while using the atomic force microscopy (AFM), surface zeta potential (electro-osmosis) and X-ray photoelectron spectroscopy (XPS), the major separation mechanisms of PFOS in the existence of other cations and anions were the sieving effect, and the electrostatic repulsion, respectively.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Separation and Purification Technology - Volume 202, 31 August 2018, Pages 385-396
Journal: Separation and Purification Technology - Volume 202, 31 August 2018, Pages 385-396
نویسندگان
Changwei Zhao, Guangshuo Hu, Deyin Hou, Ling Yu, Ying Zhao, Jun Wang, Aixin Cao, Yonghong Zhai,