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자료유형
학술저널
저자정보
저널정보
한국미생물생명공학회 Journal of Microbiology and Biotechnology Journal of Microbiology and Biotechnology 제14권 제2호
발행연도
2004.1
수록면
250 - 255 (6page)

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The aim of this work was to investigate theadsorption isotherm and kinetic model for the biosorption oflead (Pb2+) by Rhodotorula aurantiaca and to examine theenvironmental factors for this metal removal. Within fiveminutes of contact, Pb2+ sorption reached nearly 86% of thetotal Pb2+ sorption. The optimum initial pH value for removalof Pb2+ was 5.0. The percentage sorption increased steeplywith the biomass concentration up to 2 g/l and thereafter remainedmore or less constant. The Langmuir sorption model provideda good fit throughout the concentration range. The conformityof these data to the Langmuir model indicated that biosorptionof Pb2+ by R. aurantiaca could be characterized as a monolayer,single-site type phenomenon with no interaction between ionsadsorbed in neighboring sites. The maximum Pb2+ sorptioncapacity (qmax) and Langmuir constant (b) were 46.08 mg/g ofbiomass and 0.04 l/mg, respectively. The pseudo secondorderequation was well fitted to the experimental data. Thecorrelation coefficients for the linear plots of t/q against t forthe second-order equation were 0.999 for all the initialconcentrations of biosorbent for contact times of 180 min.The theoretical qeq value was very close to the experimentalqeq value.

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