Modification of bentonite with cationic surfactant for the enhanced retention of bisphenol A from landfill leachate
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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.
KeywordsHTAB-bentonite Bisphenol A Adsorption Hydraulic conductivity Breakthrough curves Landfill liner
The authors would like to express their sincere gratitude to the National Natural Science Foundation of China (No. 51322901 and No. 51479066), the Major State Basic Research Development Program of China (“973” program, No. 2012CB719804), the Major Science and Technology Program for Water Pollution Control and Treatment (2012ZX07506-002-2) and the Innovation Team of Ministry of Education (IRT13061) for the financial support of this study.
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