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Biosorption of dye from synthetic wastewater using alga enriched in phenolic compounds

In the current study, we report the preparation of modified biosorbent from Spirulina platensis microalga via the high light application in order to enhance its dye biosorption capacity. The modified biosorbent was characterized with analyses of content of phenolic compounds, FTIR and SEM. The biosorbent was applied to kinetic and equilibrium studies for removal of C.I. Basic Red 46 (C.I. BR 46) from aqueous solution. The kinetic data were best described by the logistic model, while the equilibrium data were best fitted by Langmuir model. The kinetic and isotherm studies indicated that C.I. BR 46 biosorption onto the modified biosorbent occurred in monolayers and the biosorption process was controlled by physical sorption. The level of phenolic compounds in the high light applied biosorbent was defined approximately eightfold higher than in the native biosorbent. Moreover, the high light application provided an increase in the dye biosorption capacity of about 31%, when compared to the raw biosorbent. The maximum biosorption capacity of modified biosorbent was found to be 33.33 mg g−1 for C.I. BR 46 at the worked biosorption conditions. Thus, this work reveals that high light application can potentially be used to increase biosorption capacity of biosorbents. © 2015 American Institute of Chemical Engineers Environ Prog, 35: 737–742, 2016