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Optimal Condition of PVA–SA Immobilizing Lentinus edodes Residue for Absorbing Lead and Cadmium(PDF)

Chinese Journal of Applied & Environmental Biology[ISSN:1006-687X/CN:51-1482/Q]

Issue:
2009 05
Page:
724-729
Research Field:
T & M
Publishing date:

Info

Title:
Optimal Condition of PVA–SA Immobilizing Lentinus edodes Residue for Absorbing Lead and Cadmium
Author(s):
MA Pei ZHANG Dan & HE Haijiang
(1Institute of Mountain Hazards and Environment, Chinese Academy of Sciences and Ministry of Water Conservancy, Chengdu 610041, China)
(2Graduate University of Chinese Academy of Sciences, Beijing 100049, China)
Keywords:
PVA–SA immobilization Lentinus edodes residue thermodynamics
CLC:
X703
PACS:
DOI:
10.3724/SP.J.1145.2009.00724
DocumentCode:

Abstract:
In this study, Lentinus edodes residue was immobilized by polyvinyl alcohol–Na-alginate (PVA–SA) for lead and cadmium biosorption. Based on the ability of absorbing lead and cadmium from aqueous solution, the mechanical strength and balling property, an orthogonal experiment was done to confirm the optimal condition of PVA–SA immobilizing L. edodes. The optimal immobilization condition for absorbing lead was 8% (m/V) PVA + 1% sodium alginate + 3% L. edodes + 2% CaCl2 saturated boric acid solution, with biosorption rate of 95.4%, while that for absorbing cadmium were 5% PVA + 1% SA + 3% L. edodes + 2% CaCl2, with biosorption rate of 63.7%. Langmuir model best described free L. edodes Pb2+ biosorption isotherm, with R2 0.993 9. Freundlich model best fitted free L.edodes Cd2+ biosorption isotherm, with R2 0.999 3. Freundlich model best fitted Pb2+ and Cd2+ isotherm biosorption process by PVA–SA immobilizing L. edodes, with R2 0.958 7 and 0.982 3, respectively. The theoretic maximum biosorption quantities q(Cd-m-Langmuir, free) 2.832 1< q(m-Langmuir, immobilization) 6.447 5 indicated after immobilizing treatment, capacity of L. edodes for Cd2+ biosorption increased. K(Pb-Freundlich, free) 0.312 7<K(Pb-Freundlich, immobilization) 0.431 0 showed after immobilizing treatment, capacity of L. edodes for Pb2+ biosorption also increased. Cd2+ and Pb2+ biosorped by L. edodes reached equilibrium within 60 min with equilibrium quantities qe of 1.812 mg/g and 0.844 mg/g, respectively, while that by PVA–SA immobilizing L. edodes reached within 3 h and 7 h separately with qe of 0.200 8 mg/g and 0.492 5 mg/g, respectively. Pseudo-second-order model well fitted Pb2+ and Cd2+ biosorption kinetics by immobilizing L. edodes and free L. edodes. The rate constant of Pseudo-second-order model for free L. edodes was k2Pb 1.324 1/ k2Cd 1.253 1,and that for PVA–SA immobilizing L. edodes was k2Pb 0.780 5 and k2Cd 0.213 0. Fig 3, Tab 6, Ref 16

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Last Update: 2009-10-26