+ Resolve Article
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter

+ Translate
+ Subscribe to Site Feed
GeoScience Most Shared ContentMost Shared Content

Novel nanofiltration membranes consisting of a sulfonated pentablock copolymer rejection layer for heavy metal removal

, : Novel nanofiltration membranes consisting of a sulfonated pentablock copolymer rejection layer for heavy metal removal. Environmental Science & Technology 48(23): 13880-7

Facing stringent regulations on wastewater discharge containing heavy metal ions, various industries are demanding more efficient and effective treatment methods. Among the methods available, nanofiltration (NF) is a feasible and promising option. However, the development of new membrane materials is constantly required for the advancement of this technology. This is a report of the first attempt to develop a composite NF membrane comprising a molecularly designed pentablock copolymer selective layer for the removal of heavy metal ions. The resultant NF membrane has a mean effective pore diameter of 0.50 nm, a molecular weight cutoff of 255 Da, and a reasonably high pure water permeability (A) of 2.4 LMH/bar. The newly developed NF membrane can effectively remove heavy metal cations such as Pb(2+), Cd(2+), Zn(2+), and Ni(2+) with a rejection of >98.0%. On the other hand, the membrane also shows reasonably high rejections toward anions such as HAsO4(2-) (99.9%) and HCrO4(-) (92.3%). This performance can be attributed to (1) the pentablock copolymer's unique ability to form a continuous water transport passageway with a defined pore size and (2) the incorporation of polyethylenimine as a gutter layer between the selective layer and the substrate. To the best of our knowledge, this is the first reported NF membrane comprising this pentablock copolymer as the selective material. The promising preliminary results achieved in this study provide a useful platform for the development of new NF membranes for heavy metal removal.


PMID: 25369240

DOI: 10.1021/es5031239

Other references

Malviya, M.K.; Pandey, A.; Trivedi, P.; Gupta, G.; Kumar, B., 2009: Chitinolytic activity of cold tolerant antagonistic species of streptomyces isolated from glacial sites of Indian himalaya. Seventy-eight isolates of actinomycetes were isolated from the soil samples collected from alpine zones of Pindari glacier region in Indian Himalaya. Following a plate based rapid screening using two test fungi, five efficient isolates (nos. HA1,...

Anonymous, 1975: Pests on other crops in rotation with jute. In trials with rice, application of 25 kg 5% diazinon granules, 25 kg 4% endosulfan granules or 30 kg 8% Senidol granules/ha in 2 split dressings at transplanting and 1 month later was effective against stem borer [Tryporyza incertulas] and increa...

Singh J.; Mehrotra B.S., 1972: Mycological production of citric acid in india part 5 effect of some low molecular weight alcohols. Sydowia 26(1-6): 243-250

Brenner, M.B.; Parker, C.M., 2002: Method of treating ulcerative colitis or crohns disease by administering an antibody toalphaEbeta7 integrin. The present invention relates to a method for treating an autoimmune disease, such ulcerative coliteis or crohns disease characterized by lymphocyte accumulation at epithelial sites. The method involves administering to a subject an effective amou...

Bassett R.L.; Bentley M.E.; Simpkins W.W., 1981: Regional ground-water flow in the Panhandle of Texas; a conceptual model. Geological Circular - Texas, University, Bureau of Economic Geology 81-3): 102-107

Vogel, G., 1954: The effect of blood serum on tissue oxygen consumption. Virchows Archiv für Pathologische Anatomie und Physiologie und für Klinische Medizin 325(6): 710-722

Lai, W.; Huang, L.; Ho, P.; Montefiori, D.; Chen, C-Ho., 2011: The role of dynamin in HIV type 1 Env-mediated cell-cell fusion. HIV-1 envelope glycoproteins are the key viral proteins that mediate HIV-1 entry and cell-cell fusion. In contrast to HIV-1 entry, the mechanism of HIV-1 Env-mediated cell-cell fusion is relatively unclear. This study demonstrated that dynasore, a...

Würbach, G., 1971: Antimycotic effect and skin tolerance of synthetic mustard oil compounds. II. N-monosubstituted thiocarbamid acid-O-arylester. Dermatologische Monatschrift 157(4): 248-253

Brooks, R.; Webster, A., 1981: Social behavior and activity patterns of meadow voles in relation to seasonal change and snow cover. Proceedings of the Eastern Pine and Meadow Vole Symposium: th) 64-71

Walter H., 1982: Separation and subfractionation of blood cell populations based on their surface properties by partitioning in 2 polymer aqueous phase systems. Pretlow, T G Ii And T P Pretlow (Ed ) Cell Separation Methods And Selected Applications, Vol 1 Xi+330p Academic Press, Inc : New York, N Y , Usa Illus P261-300