| Mechanism of Cd（II） adsorption by macrofungus Pleurotus platypus |
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| 作者姓名： | R. Vimal Nilanjana Das |
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| 作者单位： | School of Biosciences and Technology,VIT University,Vellore 632014,Tamil Nadu,India |
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| 基金项目： | The authors are thankful to Dr. Lazar Mathew, Director,
School of Biosciences and Technology, VIT University for
his valuable suggestions and constant support during this
study. |
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| 摘 要： | The mechanism of Cd(II) uptake by the dead biomass of macrofungus Pleurotus platypus was investigated using di erent chemical
and instrumental techniques. Sequential removal of cell wall components of the biosorbent revealed that structural polysaccharides
play a predominant role in the biosorption of Cd(II). The adsorption kinetics fitted well with the pseudo second-order model suggested
that the adsorption of Cd(II) on P. platypus involved a chemisorption process. Transmission electron microscopy of the cadmium
exposed biomass confirmed the deposition of the metal mainly in the cell wall. Fourier transform infrared spectroscopic analysis of
the metal loaded biosorbent confirmed the participation of –OH, –NH and C–O–C groups in the uptake of Cd(II). Energy dispersive
X-ray analysis of the biosorbent before and after metal uptake revealed that the main mechanism of adsorption was ion-exchange. The
e ectiveness of CaCl2 in the desorption of cadmium perhaps suggested the exchange of Ca2+ with Cd(II).
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| 关 键 词： | 生物吸附剂 镉吸附 鸭嘴兽 侧耳 机制 细胞壁成分 金属沉积 红外吸收 |
| 收稿时间： | 2/7/2010 12:00:00 AM |
| 修稿时间： | 2010/4/15 0:00:00 |
Mechanism of Cd(II) adsorption by macrofungus Pleurotus platypus |
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| R. Vimal,Nilanjana Das.Mechanism of Cd(II) adsorption by macrofungus Pleurotus platypus[J].Journal of Environmental Sciences,2011,23(2):288-293. |
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| Authors: | R Vimala and Nilanjana Das |
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| Institution: | School of Biosciences and Technology,VIT University,Vellore 632014,Tamil Nadu,India |
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| Abstract: | The mechanism of Cd(Ⅱ)uptake by the dead biomass of macrofungus Pleurotus platypus was investigated using different chemical and instrumental techniques.Sequential removal of cell wall components of the biosorbent revealed that structural polysaccharides play a predominant role in the biosorption of Cd(Ⅱ).The adsorption kinetics fitted well with the pseudo second-order model suggested that the adsorption of Cd(Ⅱ)on P.platypus involved a chemisorption process.Transmission electron microscopy of the cadmium exposed biomass confirmed the deposition of the metal mainly in the cell wall.Fourier transform infrared spectroscopic analysis of the metal loaded biosorbent confirmed the participation of-OH,-NH and C-O-C groups in the uptake of Cd(Ⅱ).Energy dispersive X-ray analysis of the biosorbent before and after metal uptake revealed that the main mechanism of adsorption was ion-exchange.The effectiveness of CaCl2 in the desorption of cadmium perhaps suggested the exchange of Ca2+with Cd(Ⅱ). |
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| Keywords: | biosorption mechanism ion-exchange Pleurotus platypus macrofungus cadmium |
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