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Modeling of Cd adsorption to goethite-bacteria composites.

Abstract：

:The accurate modeling of heavy metal adsorption in complex systems is fundamental for risk assessments in soils and associated environments. Bacteria-iron (hydr)oxide associations in soils and sediments play a critical role in heavy metal immobilization. The reduced adsorption of heavy metals on these composites have been widely reported using the component additivity (CA) method. However, there is a lack of a mechanism model to account for these deviations. In this study, we established models for Cd adsorption on goethite-Pseudomonas putida composites at 1:1 and 5:1 mass ratios. Cadmium adsorption on the 5:1 composite was consistent with the additivity method. However, the CA method over predicted Cd adsorption by approximately 8% on the 1:1 composite at high Cd concentration. The deviation was corrected by adding the site blockage reactions between P. putida and goethite. Both CA and "CA-site masking" models for Cd adsorption onto the composites were in line with the ITC data. These results indicate that CA method in simulating Cd adsorption on bacteria-iron oxides composites is limited to low bacterial and Cd concentrations. Therefore the interfacial complexation reactions that occur between iron (hydr)oxides and bacteria should be taken into account when high concentrations of bacteria and heavy metals are present.

journal_name

Chemosphere

journal_title

Chemosphere

authors

Qu C,Ma M,Chen W,Cai P,Yu XY,Feng X,Huang Q

doi

10.1016/j.chemosphere.2017.11.100

subject

Has Abstract

pub_date

2018-02-01 00:00:00

pages

943-950

eissn

0045-6535

issn

1879-1298

pii

S0045-6535(17)31877-5

journal_volume

193

pub_type

杂志文章

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