2. Experimental
2.1. Materials
Silicalite zeolite HiSiv 3000 (denoted in this paper as zeolite) was received from UOP, Mount Laurel, NJ, USA. Quartz sand (grain size 0.8–1.5 mm) was purchased from Shoshani & Weinstein (Is- rael). Methyl tertiary-butyl ether (MTBE; purity 98%), a solution of benzene, toluene, ethyl-benzene and xylene (BTEX; purity 99.9%), polydiallyldimethylammonium chloride (PDADMAC; MW 400–500 K), polyacrylamide (PAM; MW 10 K), octadecyltrimethy- lammonium bromide (ODTMA), and CsCl (purity 99.5%) were sup- plied by Sigma–Aldrich (Steinheim, Germany). Granular activated carbon Hydraffin 30 N and Hydraffin CC 8