TY - JOUR
T1 - Adsorptive removal of arsenic from aqueous solution by a PVDF/zirconia blend flat sheet membrane
AU - Zheng, Yu Ming
AU - Zou, Shuai Wen
AU - Nanayakkara, K. G.Nadeeshani
AU - Matsuura, Takeshi
AU - Chen, J. Paul
N1 - Copyright:
Copyright 2011 Elsevier B.V., All rights reserved.
PY - 2011/5/15
Y1 - 2011/5/15
N2 - The groundwater contaminated with arsenic is often associated with unwanted natural organic matters and microorganisms. It is therefore important to develop multi-functional technologies for the treatment of groundwater. In this study, a PVDF/zirconia blend flat sheet membrane was prepared so that it could adsorb arsenate and remove other contaminants such as microorganisms. The crystal structure, hydrophobicity, porosity, water flux and arsenic adsorption capacity of the membrane were investigated. The PVDF was α-form and the zirconia was amorphous in the membrane. The addition of zirconia increased the hydrophilicity and porosity of the membrane, which led to a significant enhancement in the water flux of membrane. The batch adsorption experiments demonstrated that the membrane effectively removed arsenate in a wide optimal pH ranging from 3 to 8. The adsorption equilibrium could be established in 25. h, and the maximum adsorption capacity was 21.5. mg/g, comparable to most of the available adsorbents. Co-anions such as fluoride did not obviously affect the adsorption. In addition, the membrane was efficient for removal of arsenate and bacteria (Escherichia coli) under continuous filtration. The membrane saturated by arsenate could be easily regenerated using an alkaline solution and subsequently be reused. Finally, a potential interaction mechanism between the membrane and arsenate was proposed based on the results obtained from FTIR and XPS studies.
AB - The groundwater contaminated with arsenic is often associated with unwanted natural organic matters and microorganisms. It is therefore important to develop multi-functional technologies for the treatment of groundwater. In this study, a PVDF/zirconia blend flat sheet membrane was prepared so that it could adsorb arsenate and remove other contaminants such as microorganisms. The crystal structure, hydrophobicity, porosity, water flux and arsenic adsorption capacity of the membrane were investigated. The PVDF was α-form and the zirconia was amorphous in the membrane. The addition of zirconia increased the hydrophilicity and porosity of the membrane, which led to a significant enhancement in the water flux of membrane. The batch adsorption experiments demonstrated that the membrane effectively removed arsenate in a wide optimal pH ranging from 3 to 8. The adsorption equilibrium could be established in 25. h, and the maximum adsorption capacity was 21.5. mg/g, comparable to most of the available adsorbents. Co-anions such as fluoride did not obviously affect the adsorption. In addition, the membrane was efficient for removal of arsenate and bacteria (Escherichia coli) under continuous filtration. The membrane saturated by arsenate could be easily regenerated using an alkaline solution and subsequently be reused. Finally, a potential interaction mechanism between the membrane and arsenate was proposed based on the results obtained from FTIR and XPS studies.
KW - Adsorption
KW - Arsenic
KW - Filtration
KW - PVDF/zirconia blend membrane
KW - Spectroscopic analysis
UR - http://www.scopus.com/inward/record.url?scp=79954838562&partnerID=8YFLogxK
U2 - 10.1016/j.memsci.2011.02.034
DO - 10.1016/j.memsci.2011.02.034
M3 - 文章
AN - SCOPUS:79954838562
VL - 374
SP - 1
EP - 11
JO - Journal of Membrane Science
JF - Journal of Membrane Science
SN - 0376-7388
IS - 1-2
ER -