removal of hexavalent chromium from aqueous media using mediterranean posidonia oceanica biomass : adsorption studies and salt competition investigation
نویسندگان
چکیده
the biosorption of hexavelent chromium from saline solutions by posidonia oceanica, a marinebiomass, was studied as a function of ph, initial chromium (vi) and salt (nacl) concentrations in batchsystem. the sorbent exhibited the maximal chromium (vi) uptake at ph 2 regardless of the presence ofincreasing salt concentration. equilibrium uptake increased with chromium (vi) concentration up to 250 mg/l and decreased slightly in the presence of increasing salt concentrations of salt up to 50 g/l. the biomassadsorbed 14.48 mg of metal per gram of biomass at 100 mg/l initial chromium concentration in the absence ofsalt. when 50 g/l salt concentration was added to the solution, the value diminished to 11.49 mg/g under thesame conditions (i.e. a 20.6% decrease in the biosorption capacity). the equilibrium sorption data wereanalyzed using freundlich, langmuir and redlich-peterson models. the langmuir equation was the mostsuitable adsorption model for describing the biosorption equilibrium data of chromium (vi) both in salt freeand loaded media. the pseudo-second-order type kinetic model depicted the biosorption kinetics accuratelyat all chromium concentrations in absence and presence of increasing concentrations of salt.
منابع مشابه
removal of hexavalent chromium from aqueous media using mediterranean posidonia oceanica biomass : adsorption studies and salt competition investigation
the biosorption of hexavelent chromium from saline solutions by posidonia oceanica, a marinebiomass, was studied as a function of ph, initial chromium (vi) and salt (nacl) concentrations in batchsystem. the sorbent exhibited the maximal chromium (vi) uptake at ph 2 regardless of the presence ofincreasing salt concentration. equilibrium uptake increased with chromium (vi) concentration up to 250...
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عنوان ژورنال:
international journal of environmental researchناشر: university of tehran
ISSN 1735-6865
دوره 6
شماره 3 2012
کلمات کلیدی
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