Modification of bentonite with cationic surfactant for the enhanced retention of bisphenol A from landfill leachate
HTAB-bentonite, Bisphenol A, Adsorption, Hydraulic conductivity, Breakthrough curves, Landfill liner
Bentonite was modified with cationic surfactant hexadecyl trimethyl ammonium bromide (HTAB) as landfill liner to retard the transportation of bisphenol A (BPA) for the first time. The modification was confirmed to form a lateral bi-layer in the interlayer space of bentonite by scanning electron microscope, X-ray diffraction, and Fourier transform infrared spectroscopy. The introduction of HTAB into the internal position of bentonite led to an increased interlayer space of bentonite from 15.0 to 20.9 Å and a higher sorption affinity for BPA (10.449 mg/g of HTAB-bentonite and 3.413 mg/g of raw bentonite). According to the Freundlich model, the maximum adsorption capacity of the HTAB-bentonite was found to be 0.410 mg/g. The sorption capacity of raw bentonite and HTAB-bentonite both decreased at alkaline conditions. Although the hydraulic conductivity of HTAB-bentonite was higher than that of raw bentonite, results of laboratory permeability and column tests indicated that HTAB-bentonite obviously extended the BPA breakthrough time by 43.4 %. The properties of the HTAB-bentonite revealed its notable advantages as components of landfill liners material to retain BPA in leachate.
Environmental Science and Pollution Research
Li, Y.,Jin, F.,Wang, C.,Chen, Y.,Zhang, W.,& Wang, D. (2015). Modification of bentonite with cationic surfactant for the enhanced retention of bisphenol A from landfill leachate. Environmental Science and Pollution Research, 22 (11), 8618-8628. http://dx.doi.org/10.1007/s11356-014-4068-0