TY - JOUR
T1 - Removal of zinc from aqueous solution by metal resistant symbiotic bacterium Mesorhizobium amorphae
AU - Hao, Xiuli
AU - Mohamad, Osama Abdalla
AU - Xie, Pin
AU - Rensing, Christopher Günther T
AU - Wei, Gehong
PY - 2014
Y1 - 2014
N2 - Biosorption of zinc by living biomasses of metal resistant symbiotic bacterium Mesorhizobium amorphae CCNWGS0123 was investigated under optimal conditions at pH 5.0, initial metal concentrations of 100 mg L-1, and a dose of 1.0 g L-1. M. amorphae exhibited an efficient removal of Zn2+ from aqueous solution with maximum biosorption capacity of 120.85 mg g-1. Moreover, more than 70% Zn2+ could be recovered from Zn-loaded biomass at pH 1.0. Both the Langmuir and Freundlich isotherms provided a better fit to experimental data for Zn2+ sorption with correlation coefficients of 0.9885. Kinetics models suggested there was more than one step involved in the Zn2+ sorption process, while a pseudo-second-order model was more suitable to describe the kinetic behavior accurately, indicating a chemisorption process. Carbonyl, amino, carboxyl, and aromatic groups were responsible for the biosorption of Zn2+ by M. amorphae. Cellular deformation, precipitate, and damage were found after Zn2+ treatment. Competitive sorption revealed Cu2+, Cd2+, and Ni2+ were competed with Zn2+ for adsorption sites with the order: Cu2+ > Cd2+ >> Ni2+.
AB - Biosorption of zinc by living biomasses of metal resistant symbiotic bacterium Mesorhizobium amorphae CCNWGS0123 was investigated under optimal conditions at pH 5.0, initial metal concentrations of 100 mg L-1, and a dose of 1.0 g L-1. M. amorphae exhibited an efficient removal of Zn2+ from aqueous solution with maximum biosorption capacity of 120.85 mg g-1. Moreover, more than 70% Zn2+ could be recovered from Zn-loaded biomass at pH 1.0. Both the Langmuir and Freundlich isotherms provided a better fit to experimental data for Zn2+ sorption with correlation coefficients of 0.9885. Kinetics models suggested there was more than one step involved in the Zn2+ sorption process, while a pseudo-second-order model was more suitable to describe the kinetic behavior accurately, indicating a chemisorption process. Carbonyl, amino, carboxyl, and aromatic groups were responsible for the biosorption of Zn2+ by M. amorphae. Cellular deformation, precipitate, and damage were found after Zn2+ treatment. Competitive sorption revealed Cu2+, Cd2+, and Ni2+ were competed with Zn2+ for adsorption sites with the order: Cu2+ > Cd2+ >> Ni2+.
KW - biosorption
KW - isotherms
KW - kinetics
KW - M. amorphae
KW - zinc
U2 - 10.1080/01496395.2013.843195
DO - 10.1080/01496395.2013.843195
M3 - Journal article
AN - SCOPUS:84892524610
SN - 0149-6395
VL - 49
SP - 376
EP - 387
JO - Separation Science and Technology
JF - Separation Science and Technology
IS - 3
ER -