Evaluating Zeolite and Organo-Zeolite Surface Treated with HDTMA-Br for the Removal of Oxyanion from Aqueous Solution

Hexadecyltrimethylammonium bromide (HDTMA-Br), a cationic surfactant, was added to the Jordanian zeolite in the current work, and this organo-zeolite was then utilized to eliminate the nitrate ion (oxyanion). Zeolite was used in batch trials at various parameters, and the Langmuir, Freundlich, Dubinin- Radushkevich, and Redlich-Peterson isotherms equilibrium models were examined at various temperature values of 25, 30, 35, 40, and 45?C. The experimental equilibrium results better fit the Freundlich, Dubinin-Radushkevich, and Redlich-Peterson models than the Langmuir model. Less than 8 kJ mol-1, or between 0.08 and 0.11 kJ mol-1, was the predicted energy using the Dubinin- Radushkevich model; this suggests a physisorption process. Adsorbents such as zeolite and organo-zeolite were employed in the kinetic tests conducted in a column reactor. To examine the data, kinetic models, an intraparticle diffusion of pseudo-second order, and Elovich were employed. The second-order model was used to determine the qmax values for both zeolite and organo-zeolite, which are (0.916-1.274) and (1.720-2.074), respectively. The values of qmax for organozeolite are greater than those for zeolite. For both the zeolite and the organozeolite, the estimated and experimental capacities at various temperature values agreed well, as indicated by the normalized standard deviation (%SSE). while using zeolite as the adsorbent, the intraparticle diffusion model deviated from linearity and displayed a single line; while using organo-zeolite, it displayed a single line. The zeolite and the organo-zeolite have computed activation energies (Ea) of 90.7 and 13.7 kJ/mol, respectively.