Abstract
Locally sourced clay from Kuala-Kangsar town in Perak state Malaysia was used in both its raw (RKKC) and modified (MKKC)
form as adsorbents for the removal of methylene blue (MB) from synthetic textile wastewater in batch adsorption process. The
raw clay was modified through H2SO4 acid treatment, Al(OH)3 ion exchange, calcinations and then molded into beads before
freeze drying. The BET surface areas of RKKC and MKKC were 11 and 100 m2/g, respectively; their elemental analysis and
surface morphology were determined using scanning electron spectroscopy (SEM). Adsorption isotherm studies of both
adsorbents showed that the order of fitness in ascension was Langmuir, Freundlich and Redlich Peterson with their lowest
correlation coefficient R2 values of 0.883, 0.950 and 0.965, respectively; and the adsorption process obeyed pseudo-second-order
reaction kinetic. Adsorption of MB on MKKC was spontaneous and endothermic as revealed by the thermodynamic studies of
the process. The MKKC was good for adsorption of MB and found to be reusable.