The present study was conducted to optimize the various experimental conditions, such as
biomass loading, initial C.I. Acid Blue 25 (AB25) dye concentration, and initial solution pH
for biosorption of dye on raw and HCl-treated brown alga, Padina australis and red alga,
Jania adhaerens. Biosorption process was optimized in a batch system under Box–Behnken
design. Second-order polynomial equation was successfully used to describe the effects of
studied variables on response. The quadratic models exhibited higher R2 values, significant
p-values, and insignificant lack-of-fit p-values showed high adequacy for predicting the
response. Chemically modified red alga exhibited better AB25 dye biosorption capacity as
compared to modified brown alga. Maximum dye removal efficiencies of 77.34, 71.28, 50.56,
and 85.19% for P. australis, HCl-treated P. australis, J. adhaerens, and HCl-treated J. adhaerens,
respectively, were obtained at optimal conditions. The surface modification on tested algal
biomass was found to be strongly dependent on their cell wall constituents.
کلید واژگان :
Response surface methodology, Acid Blue 25 dye, Biosorption, Chemical modification, Macroalgae
