Removal Mechanism of Lead (II) Ions by Bioflocculant MBFA9 from Aqueous Solution

doi:10.12068/j.issn.1005-3026.2016.11.015

Abstract

Abstract: The bioflocculant produced by a stain of Paenibacillus sp. A9 which separated and purified from soilhada high removal rate of Pb²⁺ in the water， and the adsorption kinetics and thermodynamic process of MBFA9 were further investigated. The results showed that the removal rate of Pb²⁺ reaches 92.73% at initial concentration of 56.2mg/L.The theoretical maximum capacity was 196.08mg/g， and the adsorption rate constant k₂ was 0.019g/(mg·min^-1).The dynamic characteristics of MBFA9 capturing Pb²⁺ in the water are in accordance with pseudo-second kinetic model， and the adsorption isotherm model of MBFA9 capturing Pb²⁺ agrees well with the Langmuir equation of thermodynamics with the correlation coefficient R²=0.96. Comparison among the IR spectra，SEM and EDS of MBFA9 capturing Pb²⁺ showed that the main component of MBFA9 is polysaccharides and the reaction mechanism is that functional groups on the surface of flocculant and Pb²⁺ formed chelate by chelation.There is chemical reaction between hydroxyl， amido， carboxyl and Pb²⁺ in the trapping process， and there is also a floc of sweep function， so MBFA9 has better removal effect on Pb²⁺.

Key words: MBFA9, Pb²⁺, kinetics, thermodynamics, removal mechanism

CLC Number:

TB332

JIANG Bin-hui， LI Feng-da， LIU Qian， HU Xiao-min. Removal Mechanism of Lead (II) Ions by Bioflocculant MBFA9 from Aqueous Solution[J]. Journal of Northeastern University Natural Science, 2016, 37(11): 1588-1592.

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