Abstract：
:A novel strategy utilizing the phenyls interaction and the hydrophobic affinity of available siloxane surface in the interlayer of bentonite was proposed to improve the sorption capabilities of organobentonites for water soluble aromatic contaminants. A unique organobentonite (65BTMA) was synthesized by intercalating benzyltrimethylammonium cation (BTMA(+)) into the interlayer of a reduced-charge bentonite with cation exchange capacity (CEC) of 65 cmol kg(-1). Phenol, aniline and toluene were used as model compounds of water soluble aromatic contaminants. Their respective removal efficiencies by 65BTMA were achieved at 83.3%, 89.2% and 97.3% at the initial concentration of 20 mg l(-1). To reveal the sorption mechanism, sorption characteristics of aromatic contaminants to 65BTMA were compared with that of aliphatic contaminants in similar molecular size. And various organobentonites were prepared by combining TMA(+) (tetramethylammonium), BTMA(+), HTMA(+) (heptyltrimethylammonium) and CTMA(+) (cetyltrimethylammonium) with two bentonites (CEC=108 and 65 cmol kg(-1)). To 65BTMA, sorption magnitudes of aromatic contaminants were much greater than that of aliphatic compounds with similar size; and dramatically higher than those to other organobentonites at low pollutant concentrations. These observations revealed that the strong phenyls interactions contributed significantly to sorb the aqueous soluble aromatic contaminants to 65BTMA (>90%), and which favored to design uniquely powerful sorbents.
journal_name
Chemospherejournal_title
Chemosphereauthors
Zhu L,Ruan X,Chen B,Zhu Rdoi
10.1016/j.chemosphere.2007.09.042subject
Has Abstractpub_date
2008-02-01 00:00:00pages
1987-94issue
11eissn
0045-6535issn
1879-1298pii
S0045-6535(07)01189-7journal_volume
70pub_type
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