Biosorption of acid dye benewol red by red alga Gracilaria fisheri
2011
Kawin Pansamrit(King Mongkut's Institute of Technology Ladkrabang, Bangkok (Thailand). Faculty of Agricultural Technology. Division of Animal Production Technology and Fisheries. Program in Fisheries Science) | Atiya Saparnklang(King Mongkut's Institute of Technology Ladkrabang, Bangkok (Thailand). Faculty of Agricultural Technology. Division of Animal Production Technology and Fisheries. Program in Fisheries Science) | Suneerat Ruangsomboon(King Mongkut's Institute of Technology Ladkrabang, Bangkok (Thailand). Faculty of Agricultural Technology. Division of Animal Production Technology and Fisheries. Program in Fisheries Science)
To evaluate the ability and potential use of red alga, Gracilaria fisheri to remove acid dye (Benewol Red) from synthetic wastewater, the optimum conditions and kinetics of this alga for acid dye removal were studied. The results showed that the optimum pH for acid dye removal by G. fisheri was 3. The adsorption of acid dye was very rapid and reached equilibrium within 6 h with adsorption capacity 40.31+-0.35 mg/g dry wt. Elevated biomass concentration decreased acid dye uptake (mg/g dry wt.) by this alga. Acid dye adsorption by G. fisheri followed Langmuir adsorption isotherm (r sup(2)=0.924) with the maximum dye adsorption capacity (Qmax) 484.13 mg/g dry wt. and adsorption constant (Ka) 0.007 L/mg. Adsorption kinetic of acid dye removal by this alga followed the second order rate reaction and intraparticle diffusion was likely the rate-limiting step. The rate of intraparticle diffusion increase when the initial concentrations of acid dye increase.
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