Cyanobacteria as a biosorbent for mercuric ion

被引：60

作者：

Cain, Amber ^{[1
]}

Vannela, Raveender ^{[1
]}

Woo, L. Keith ^{[1
]}

机构：

[1] Iowa State Univ, Dept Chem, Ames, IA 50011 USA

来源：

BIORESOURCE TECHNOLOGY | 2008年 / 99卷 / 14期

关键词：

mercury ion; biosorbent; Spirulina platensis; Aphanothece flocculosa; sorption equilibrium;

D O I：

10.1016/j.biortech.2007.11.034

中图分类号：

S2 [农业工程];

学科分类号：

0828 [农业工程];

摘要：

The biosorption of Hg2+ by two strains of cyanobacteria, Spiridina platensis and Aphanothece flocculosa, was studied under a batch stirred reaction system. Essential process parameters, including pH, biomass concentration, initial metal concentration, and presence of co-ions were shown to influence the Hg2+ uptake. Hg2+ uptake was optimal at pH 6.0 for both strains. The maximum loading capacities per gram of dry biomass were found to be 456 mg Hg2+ for A. flocculosa and 428 mg Hg2+ for S. platensis. At an initial concentration of 10 ppm Hg2+, A. flocculosa was able to remove more than 98% of the mercury ion from solution. The biosorption kinetics of both strains showed that the metal uptake is bi-phasic, exhibiting a rapid initial uptake followed by a slower absorption process. The presence of dissolved Co2+, Ni2+, and Fe3+ were found to play a synergistic role for Hg2+ uptake by both strains. Regeneration of the biomass was examined by treating Hg2+-loaded samples with HCl and NH4Cl over four cycles of sorption and desorption. (c) 2007 Elsevier Ltd. All rights reserved.

引用

页码：6578 / 6586

页数：9

共 54 条

[1]

Biosorption characteristics of Aspergillus flavus biomass for removal of Pb(II) and Cu(II) ions from an aqueous solution [J].