Mahboube Shirani

Magne tic NaY zeol ite immo biliz ed with 1-butyl -3-methyl imidazol ium tetrachl oroferr ate ([bmim] Cl/ FeCl 3 ) ionic liquid as a reus able, efficient, and easily sepa-rable adsorbent was synt hesized to remove dibenzot hio-phene from n -hexane. SEM–ED X, FT-IR were used for charact erizati on of the synthesi zed mag netic sorbe nt. The prepared ionic liquid was char acterize d by with NM R, and mass spectro metry . The mag netic property of the sorbent was consider ed by VSM method. The obtaine d saturati on magnet ization of 19.5 emu g - 1 confirmed the facil e sepa-ration of mag netic zeolite immo bilized with [bmim]Cl/ FeCl 3 after adsorptio n proce ss. Centr al composi te design was applied to predict the propos ed proce ss and to achieve the optim um condi tions for thr ee influe ntial parame ters of temper ature, time, and sorbe nt mass. At the predicted con-dition s, temperat ure of 23.2 C, time of 24.7 min, and sor-bent mas s of 0.836 g, the sulfur removal of 97.9 ± 0.5 % was exper imental ly obta ined which was close to the model sulfur remo val predi ction of 98.4 %. This noticea ble agreem ent proved the proper and accepta ble estimation of the central comp osite desi gn model for the propos ed process. The exper imental data were reasonabl y fitted to the Lang-muir and Freund lich model which show s that the sorpti on takes place on a heteroge neous materia l. The sorpti on capacit ies of 2.957 (m g g - 1 ) were achieved from sorpti on isother ms