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首页> 外文期刊>Bioprocess and Biosystems Engineering >Characterization of Pb~(2+) biosorption from aqueous solution by Rhodotorula glutinis
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Characterization of Pb~(2+) biosorption from aqueous solution by Rhodotorula glutinis

机译：球形红假单胞菌对水溶液中Pb〜（2+）生物吸附的表征

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摘要

The yeast Rhodotorula glutinis was examined for its ability to remove Pb~(2+) from aqueous solution. Within 10 min of contact, Pb~(2+) sorption reached nearly 80% of the total Pb~(2+) sorption. The optimum initial pH value for removal of Pb~(2+) was 4.5-5.0. The percentage sorption increased steeply with the biomass concentration up to 2 g/l and thereafter remained more or less constant. Temperature in the range 15-45℃ did not show any significant difference in Pb~(2+) sorption by R. glutinis. The light metal ions such as Na~+, K~+, Ca~(2+), and Mg~(2+) did not significantly interfere with the binding. The Langmuir sorption model provided a good fit throughout the concentration range. The maximum Pb~(2+) sorption capacity q_(max) and Langmuir constant b were 73.5 mg/g of biomass and 0.02 l/mg, respectively. The mechanism of Pb~(2+) removal by R. glutinis involved biosorption by direct biosorptive interaction with the biomass through ion exchange and precipitation by phosphate released from the biomass.
机译：检查了酵母Rhodotorula glutinis从水溶液中去除Pb〜（2+）的能力。在接触的10分钟内，Pb〜（2+）的吸附量接近总Pb〜（2+）吸附量的80％。去除Pb〜（2+）的最佳初始pH值为4.5-5.0。当生物质浓度达到2 g / l时，吸附百分比急剧增加，此后基本保持恒定。温度在15-45℃范围内，对谷胶体对Pb〜（2+）的吸附没有显着差异。轻金属离子如Na〜+，K〜+，Ca〜（2+）和Mg〜（2+）不会显着干扰结合。 Langmuir吸附模型在整个浓度范围内都具有很好的拟合度。最大的Pb〜（2+）吸附量q_（max）和Langmuir常数b分别为73.5 mg / g生物量和0.02 l / mg。谷氨酸棒杆菌去除Pb〜（2+）的机制包括通过离子交换与生物质直接生物吸附相互作用而进行生物吸附，以及通过从生物质中释放的磷酸盐进行沉淀。

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