Chromium (VI) adsorption characteristics of bentonite under different modification patterns

• Autorzy: Li W. , Meng Z. , Liu Z. , Chen H. , Wu Q. , Xu S.
• Języki publikacji: EN

Abstrakty

EN

We investigated the Cr(VI) adsorption characteristics of bentonite under different modifi cation patterns by using a mixture of BS-12 (dodecyl dimethyl betaine) and DTAB (dodecyl trimethyl ammonium bromide). DTAB was used to compositely modify 25%, 50%, and 100% BS-12-modifi ed bentonite (three modifi ed modes of bentonite with BS-12). In addition to these modifi cation modes, variations as functions of pH value, temperature, and ionic strength were compared. Results showed: 1. Cr(VI) adsorption capacity of bentonite compositely modifi ed with BS (short for BS-12) + DT (short for DTAB) rapidly increased compared with that of BS-modifi ed bentonite, and the adsorption capacity of 100%BS+100%DT-modifi ed bentonite was the highest among the samples surveyed and 23-fold higher than that of CK (raw bentonite). 2. Cr(VI) adsorption on bentonite exhibited saturated adsorption in ion exchange (IE) mode, distributive adsorption in ion exchange and hydrophobic bond coexisting (IE+HB) pattern, and synergistic adsorption in the hydrophobic bond (HB) pattern. 3. Effects of rising temperature on Cr(VI) adsorption appeared in the IE mode, while negative temperature effect was observed in the HB mode. Higher pH value and ionic strength were unfavorable for Cr(VI) adsorption. 100%BS+100%DT compositely modifi ed bentonite exhibited the optimal adsorption of Cr(VI) at 10ºC, pH = 4, and ionic strength of 0.01 mol L⁻¹.

• Wydawca: -
• Czasopismo: Polish Journal of Environmental Studies
• Rocznik: 2016
• Tom: 25
• Numer: 3
• Opis fizyczny: p.1075-1083,fig.,ref.

Twórcy

autor

Li W.

• Department of Natural Resource and Environment, Northwest AandF University, Yangling, Shaanxi, 712100, China

autor

Meng Z.

• Department of Natural Resource and Environment, Northwest AandF University, Yangling, Shaanxi, 712100, China
• Key Laboratory of Plant Nutrition and Agri-Environment in Northwest China, Ministry of Agriculture, Yangling 712100, China

autor

Liu Z.

• Department of Natural Resource and Environment, Northwest AandF University, Yangling, Shaanxi, 712100, China

autor

Chen H.

• Department of Agricultural, Northwest AandF University, Yangling, Shaanxi, 712100, China

autor

Wu Q.

• Department of Natural Resource and Environment, Northwest AandF University, Yangling, Shaanxi, 712100, China

autor

Xu S.

• Department of Biological and Agriculture Engineering, University of Arkansas, Fayetteville 72707, USA

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Identyfikatory

DOI

10.15244/pjoes/61626