Biosorption of uranium by Stenotrophomonas maltophilia H002

Abstract:

In order to deal with the large-scale water pollution caused by uranium, a strategy of biological treatment, and a method of microbial adsorption is used to achieve the purpose of removing uranium pollution in this research. In this study, a strain H002 with high tolerance to heavy metal uranium was selected from 142 isolates of radiation-resistant bacteria, which can stably tolerate up to 150 mg/L U (VI). After 16s rRNA, physiological and biochemical identification, it was determined the H002 belonged to Stenotrophomonas maltophilia. Adsorption experiments under different parameters showed that the maximum adsorption capacity of uranium by H002 cells reached 240 mg/g (dry weight cells) when the cells were collected from 12 hculture in TGY. The carboxyl group on the cell surface was shown to contribute to uranium adsorption by H002. In addition, different anions, cations and surfactants could affect the adsorption of uranium by H002 cells. Among them, sodium dodecyl sulfate could promote the adsorption of uranium, while high concentrations of CO32- and HCO3- ions inhibited adsorption. This study finally obtained a Stenotrophomonas maltophilia H002 that can tolerate and adsorb uranium, which has the potential to be a biological material for clearing uranium pollution.