Biosorption of mercury by carboxymethylcellulose and immobilized Phanerochaete chrysosporium |
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Authors: | A SaglamY Yalç inkaya,A DenizliM.Y Arica,Ö Genç S Bektas |
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Affiliation: | a Department of Chemistry, Hacettepe University, Beytepe, Ankara, Turkey b Department of Biology, Hacettepe University, Beytepe, Ankara, Turkey c Department of Biology, Kirikkale University, Yahsihan, Kirikkale, Turkey |
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Abstract: | Phanerochaete chrysosporium basidiospores immobilized onto carboxymethylcellulose were used for the removal of mercury ions from aqueous solutions. The biosorption of Hg(II) ions onto carboxymethylcellulose and both immobilized live and heat-inactivated fungal mycelia of Phanerochaete chrysosporium was studied using aqueous solutions in the concentration range 30-700 mg l−1. The biosorption of Hg(II) ions by the carboxymethylcellulose and both live and heat-inactivated immobilized preparations increased as the initial concentration of mercury ions increased in the medium. Maximum biosorption capacity for immobilized live and heat-inactivated fungal mycelia of Phanerochaete chrysosporium was found to be 83.10 and 102.15 mg Hg(II) g−1, respectively, whereas the amount of Hg(II) ions adsorbed onto the plain carboxymethylcellulose beads was 39.42 mg g−1. Biosorption equilibria were established in approximately 1 h and the correlation regression coefficients show that the adsorption process can be well defined by a Langmuir equation. Temperature changes between 15 and 45 °C did not affect the biosorption capacity. The effect of pH was also investigated and the maximum adsorption of Hg(II) ions onto the carboxymethylcellulose and both live and heat-inactivated immobilized fungal mycelia was observed at pH 6.0. The carboxymethylcellulose-fungus beads could be regenerated using 10 mM HCl, with up to 95% recovery. The biosorbents were used in three biosorption-desorption cycles and no significant loss in the biosorption capacity was observed. |
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Keywords: | Hg(II) Carboxymethylcellulose Biosorption Phanerochaete chrysosporium |
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