Adsorption kinetics of Pb and Cd by two plant growth promoting rhizobacteria

S. C. Wu; X. L. Peng; K. C. Cheung; S. L. Liu; M. H. Wong

doi:10.1016/j.biortech.2009.04.037

Adsorption kinetics of Pb and Cd by two plant growth promoting rhizobacteria

S. C. Wu, X. L. Peng, K. C. Cheung, S. L. Liu, M. H. Wong^*

^*Corresponding author for this work

Department of Biology

Research output: Contribution to journal › Journal article › peer-review

43 Citations (Scopus)

Abstract

A bench study was carried out to characterize the kinetics of two plant growth promoting rhizobacteria (PGPR) Azotobacter chroococcum and Bacillus megaterium to adsorb heavy metals from solution. Adsorption of Pb²⁺ and Cd²⁺ by bacterial cells was processed quickly with an equilibration achieved within 5 min. The adsorptions were fitted well with Freundlich and Langmuir isotherm models. The comparison of isotherm parameters indicated that A. chroococcum had a stronger capacity to bind metal ions than B. megaterium, with an average increase of 59.8% for Pb²⁺ and 75.6% for Cd²⁺, respectively. Both bacteria had a stronger affinity to Pb²⁺ than Cd²⁺ since Pb²⁺ was more easily bound with the phosphoryl groups on the cell surface than Cd²⁺. This demonstrated that the presence of bacteria in the rhizosphere may result in the reduction of mobile ions in soil solution.

Original language	English
Pages (from-to)	4559-4563
Number of pages	5
Journal	Bioresource Technology
Volume	100
Issue number	20
DOIs	https://doi.org/10.1016/j.biortech.2009.04.037
Publication status	Published - Oct 2009

User-Defined Keywords

Adsorption
Bacteria
Heavy metals ion
Medal binding capacity

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10.1016/j.biortech.2009.04.037

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title = "Adsorption kinetics of Pb and Cd by two plant growth promoting rhizobacteria",

abstract = "A bench study was carried out to characterize the kinetics of two plant growth promoting rhizobacteria (PGPR) Azotobacter chroococcum and Bacillus megaterium to adsorb heavy metals from solution. Adsorption of Pb2+ and Cd2+ by bacterial cells was processed quickly with an equilibration achieved within 5 min. The adsorptions were fitted well with Freundlich and Langmuir isotherm models. The comparison of isotherm parameters indicated that A. chroococcum had a stronger capacity to bind metal ions than B. megaterium, with an average increase of 59.8% for Pb2+ and 75.6% for Cd2+, respectively. Both bacteria had a stronger affinity to Pb2+ than Cd2+ since Pb2+ was more easily bound with the phosphoryl groups on the cell surface than Cd2+. This demonstrated that the presence of bacteria in the rhizosphere may result in the reduction of mobile ions in soil solution.",

keywords = "Adsorption, Bacteria, Heavy metals ion, Medal binding capacity",

author = "Wu, {S. C.} and Peng, {X. L.} and Cheung, {K. C.} and Liu, {S. L.} and Wong, {M. H.}",

note = "Funding Information: This study is supported by the Cooperative Research Center (CRC/99-00/01), and the Area of Excellence Scheme (CityU, AoE/P-04/04), Research Grants Council of the University Grants Committee of Hong Kong.",

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AU - Wu, S. C.

AU - Peng, X. L.

AU - Cheung, K. C.

AU - Liu, S. L.

AU - Wong, M. H.

N1 - Funding Information: This study is supported by the Cooperative Research Center (CRC/99-00/01), and the Area of Excellence Scheme (CityU, AoE/P-04/04), Research Grants Council of the University Grants Committee of Hong Kong.

PY - 2009/10

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N2 - A bench study was carried out to characterize the kinetics of two plant growth promoting rhizobacteria (PGPR) Azotobacter chroococcum and Bacillus megaterium to adsorb heavy metals from solution. Adsorption of Pb2+ and Cd2+ by bacterial cells was processed quickly with an equilibration achieved within 5 min. The adsorptions were fitted well with Freundlich and Langmuir isotherm models. The comparison of isotherm parameters indicated that A. chroococcum had a stronger capacity to bind metal ions than B. megaterium, with an average increase of 59.8% for Pb2+ and 75.6% for Cd2+, respectively. Both bacteria had a stronger affinity to Pb2+ than Cd2+ since Pb2+ was more easily bound with the phosphoryl groups on the cell surface than Cd2+. This demonstrated that the presence of bacteria in the rhizosphere may result in the reduction of mobile ions in soil solution.

AB - A bench study was carried out to characterize the kinetics of two plant growth promoting rhizobacteria (PGPR) Azotobacter chroococcum and Bacillus megaterium to adsorb heavy metals from solution. Adsorption of Pb2+ and Cd2+ by bacterial cells was processed quickly with an equilibration achieved within 5 min. The adsorptions were fitted well with Freundlich and Langmuir isotherm models. The comparison of isotherm parameters indicated that A. chroococcum had a stronger capacity to bind metal ions than B. megaterium, with an average increase of 59.8% for Pb2+ and 75.6% for Cd2+, respectively. Both bacteria had a stronger affinity to Pb2+ than Cd2+ since Pb2+ was more easily bound with the phosphoryl groups on the cell surface than Cd2+. This demonstrated that the presence of bacteria in the rhizosphere may result in the reduction of mobile ions in soil solution.

KW - Adsorption

KW - Bacteria

KW - Heavy metals ion

KW - Medal binding capacity

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Adsorption kinetics of Pb and Cd by two plant growth promoting rhizobacteria

Abstract

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