Abstract
The natural cation in Wyoming bentonite is exchanged with Tetramethylammonium (TMA+) ions. The adsorptive properties of TMA‐bentonite increase in direct proportion to the exchange reaction below 60% of the CEC of the clay. The ability of the modified clay to remove benzene decreases at doses higher than 150% of the CEC of the clay. Adsorption isotherm constants on TMA‐bentonite are calculated from equilibrium studies for benzene, toluene, and o‐xylene. The selectivity of the TMA‐tailored bentonite follows the following order: benzene » toluene > o‐xylene. Solute equilibrium concentration is attained within fiveminute contact time. Solution pH plays a secondary role on the adsorptive nature of TMA‐bentonite.
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