Adsorption isotherms of modified zeolites on the removal of bromophenol blue on aqueous solutions

Date of Completion


Document Type


Degree Name

Bachelor of Science in Biochemistry


Bromphenol Blue.


This study was conducted to determine the suitable adsorption isotherm of modified zeolites for the removal of Bromophenol blue (BPB) in aqueous solutions. The zeolites were successfully modified with the use of sodium hydroxide and a surfactant, cetyl trimethyl ammonium chloride (CTAC) which were monitored by changes in functionalities by FTIR spectroscopy. Scanning electron microscope (SEM) micrographs showed irregular spherical morphologies of the zeolites with cavities and pores. An increase in the number of pores and a decrease in pore size were observed upon modification of zeolites. Differential scanning calorimetry (DSC) demonstrated a slightly improved thermal stability of modified zeolites. Adsorption studies were performed and showed that CTAC-modified zeolite showed the greatest percent removal (29.99±0.39%) at pH 7 among the three zeolites. This type of zeolite showed the greatest percent removal (74.41±1.6%) at pH 4 and showed Freundlich adsorption isotherm with an r2 equals 0.999 to have a multilayer adsorption process. This study can be used for possible bioremediation material for removing dyes in waste waters.

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