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2012 | 21 | 5 |

Tytuł artykułu

Effects of surfactants on the sorption of Sulfamethoxazole by sediment

Warianty tytułu

Języki publikacji

EN

Abstrakty

EN
Adsorption and desorption of sulfamethoxazole (SMX) at water-sediment interfaces from Taihu Lake, China, were investigated in this study. The effects of a cationic surfactant, cetyltrimethylammonium bromide (CTAB), and an anionic surfactant, sodium dodecylbenzene sulfonate (SDBS), on the adsorption/desorption processes were also studied. Results show that adsorption and desorption could be well described by the Freundlich isotherm model. CTAB significantly increased the SMX adsorption on sediments, while SDBS decreased the adsorption of SMX, probably because SDBS at high concentrations competed in the limited adsorption sites with SMX, and the addition of SDBS increased SMX solubility, thereby reducing the SMX adsorption on sediment. The degree of adsorption irreversibility was quantified by the Thermodynamic Index of Irreversibility (TII) values. It shows that the TII values increased with the increase of CTAB concentration, and decreased with the increase of SDBS concentration. These results imply that cationic and anionic surfactants may have contrasting impacts on the distribution and transport of SMX in the environment.

Słowa kluczowe

Wydawca

-

Rocznik

Tom

21

Numer

5

Opis fizyczny

p.1505-1511,fig.,ref.

Twórcy

autor
  • State Key Laboratory of Environmental Criteriaand Risk Assessment, Laboratory of Riverine Ecological Conservation and Technology, Chinese Research Academy of Environmental Sciences, Beijing100012, China
autor
autor
autor
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autor

Bibliografia

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Typ dokumentu

Bibliografia

Identyfikatory

Identyfikator YADDA

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