Characteristics of copper removal and ion release during copper biosorption by Stenotrophomonas maltophilia in presence of benzo[a]pyrene

Abstract

The ability of Stenotrophomonas maltophilia was demonstrated to selectively remove Cu²⁺ from Cu(NO₃)₂ solution under the circumstance that 1 mg/L benzo[a]pyrene (BaP) was either present or not. The removal ratios of 2 and 10 mg/L Cu²⁺ by 0.25 g/L biosorbent are up to 80% and 49% at 10 min, respectively. The biosorption includes ion exchange, NO₃⁻ reduction, ion release, and cell oxidation by Cu²⁺. BaP does not significantly affect Cu²⁺ removal and ion release. Although 2 mg/L Cu²⁺ increases the release of PO₄³⁻, K⁺, NH₄⁺ and Ca²⁺, 10 mg/L Cu²⁺ has strong oxidation on cell, and then decreases NO₃⁻ reduction and hinders the release of K⁺, NH₄⁺ and Ca²⁺. Exogenous cations inhibit the Cu²⁺ biosorption, while additional anions increase the removal ratios of 10 mg/L Cu²⁺ from 52% to 88%.

Keywords

biosorption / copper / benzo[a]pyrene / Stenotrophomonas maltophilia

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