Immobilization of heavy metals by Pseudomonas putida CZ1/goethite composites from solution

Selenate adsorption to composites of Escherichia coli and iron oxide during the addition, oxidation, and hydrolysis of Fe(II)

“…compare Manceau and Charlet, 1994;and Kenward et al, 2006). In contrast, the previously studied metal cations have generally displayed the opposite Templeton et al (2003aTempleton et al ( , 2003b Pb 2+ Mineral Yes Martinez et al (2004) Cd 2+ Bacteria No Kulczycki et al (2005) Cd 2+ , Pb 2+ Bacteria No Chen et al (2008) Cu 2+ , Zn 2+ Bacteria Yes Langley et al (2009) Sr 2+ Not determined Not determined Song et al (2009) Cd 2+ Both No Alessi and Fein (2010) Cd 2+ Both Both Daughney et al (2011) Cd 2+ Bacteria No Peacock (2012, 2013) Cu 2+ Both Both a In an additive system, adsorption onto the bacteria-iron oxide composite can be accurately predicted from the mass concentration of the bacteria and the mineral within the mixture, in conjunction with models of adsorption onto these end-members. Two studies have reported both additive and non-additive behavior in the same system, but under different experimental conditions.…”

“…One such study evaluated Cu 2+ and Zn 2+ adsorption onto composites with various ratios of Pseudomonas putida to goethite (Chen et al, 2008). This study also evaluated the effect of living versus non-living cells.…”

Transformation of Lead Solid Fraction in the Rhizosphere of Elsholtzia splendens: The Importance of Organic Matter

“…According to Table 3, there was a significant increase of culturable bacteria in the rhizosphere soil relative to non-rhizosphere soil of E. splendens, a result consistent with the common view that the microbial biomasses are almost always higher in the rhizosphere than in the non-rhizoshpere soils (Gregory 2006). Our previous studies have indicated that heavy metal-resistant bacteria can colonized in the rhizosphere soil of E. splendens , and the isolated culturable bacteria (such as Pseudomonas putida CZ1) from the rhizosphere of E. splendens grown in the heavy-metal-contaminated soil can tolerate, accumulate, and immobilize heavy metals from solution by adsorption and enhance the accumulation of heavy metals in the plant tissues of E. splendens (Chen et al 2005;Chen et al 2006;Chen et al 2007;Chen et al 2008). Recently, similar results were also found by others using different leadresistant bacteria and plants (Jiang et al 2008;Sheng et al 2008a, b).…”

Cu(II) removal by E. coli –iron oxide composites during the addition and oxidation of Fe(II)

“…Another set of experiments investigated Pb adsorption by Burkholderia cepacia biofilms on oxide minerals and found that adsorption occurred primarily to the mineral component above pH 6, with adsorption to the cells only observed at lower pH values (Templeton et al, 2003a(Templeton et al, , 2003b). Another study examined Cu and Zn adsorption onto composites with fixed Pseudomonas putida-to-goethite ratios and also evaluated the effect of living versus non-living cells on adsorption behavior, and found that metal ion removal by the composites was well predicted by sorption behavior in the single sorbent systems (Chen et al, 2008). Song et al (2009) reported that Cd adsorption onto composites over a range of bacteria-to-ferrihydrite weight ratios was consistently~10% less than that predicted under the assumption of additive sorption behavior.…”