Abstract：
:Perfluorooctane sulfonate (PFOS), as one of emerging contaminants, has been attracting increasing concerns in recent years. Sorption of PFOS by maize straw- and willow-derived chars (M400 and W400), maize straw-origin ash (MA) as well as three carbon nanotubes (CNTs) was studied in this work. The sorption kinetics of PFOS by the six adsorbents was well fitted by the pseudo-second-order model. CNTs reached equilibrium in 2h, much faster than those by chars (384 h) and ash (48 h). According to the sorption isotherms, both single-walled carbon nanotubes (SWCNT) and MA had high sorption capacities (over 700 mg g(-1)), while the two chars had low sorption capacities (below 170 mg g(-1)) caused by their small BET surface area. In the case of MA, due to its positively charged surface, both hydrophobic interaction and electrostatic attraction involved in the sorption, and the formation of hemi-micelles further favored the sorption. This study suggested that SWCNT and MA were effective adsorbents for PFOS removal from water. Compared to SWCNT, MA is low cost and easy to obtain, so it could be a preferred adsorbent for PFOS removal.
journal_name
Chemospherejournal_title
Chemosphereauthors
Chen X,Xia X,Wang X,Qiao J,Chen Hdoi
10.1016/j.chemosphere.2011.04.018subject
Has Abstractpub_date
2011-05-01 00:00:00pages
1313-9issue
10eissn
0045-6535issn
1879-1298pii
S0045-6535(11)00409-7journal_volume
83pub_type
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