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Site-Specific Adsorption of 1,3-Dinitrobenzene to Bacterial Surfaces: A Mechanism of n– Electron-Donor-Acceptor Interactions

State Key Laboratory of Pollution Control and Resource Reuse, and School of the Environment, Nanjing Univ., Jiangsu 210093, China

View larger version (9K): [in this window] [in a new window]   Fig. 1. Equilibrium sorbed concentration (q) vs. aqueous phase concentration (Ce) shown on logarithm scales for different solutes to bacteria in 0.1 mol L–1 NaCl. Closed circles, 1,3-dinitrobenzene (DNB); closed triangles, phenanthrene; closed diamonds, 1,2,4,5-tetrachlorobenzene; closed squares, 2,6-dichlorobenzonitrile. Isotherms on duplicates were done for DNB, and single-point data on three replicates were used for other solutes. Bidirectional error bars, in most cases smaller than the symbols, represent SDs.

View larger version (12K): [in this window] [in a new window]   Fig. 2. Equilibrium sorbed concentration (q) vs. aqueous phase concentration (Ce) shown on linear scales for 1,3-dinitrobenzene (DNB) to bacteria in different electrolyte solutions. Closed circles, 0.1 mol L–1 NaCl only; closed triangles, 0.1 mol L–1 KCl only; open diamonds, 0.1 mol L–1 CsCl only; open triangles, 0.1 mol L–1 NaCl plus 3 mg L–1 Fe3+; open squares, 0.1 mol L–1 NaCl plus 3 mg L–1 Cu2+. Isotherms on duplicates were done for NaCl and KCl solutions, and single-point data on four replicates were done for other electrolytes. Bidirectional error bars, in most cases smaller than the symbols, represent SDs. Lines represent Langmuir fitting curves to sorption isotherms. Arrows point to samples spiked with equal DNB concentrations.

View larger version (15K): [in this window] [in a new window]   Fig. 3. Illustrative schema for n– electron-donor-acceptor interactions between 1,3-dinitrobenzene (DNB) (electron acceptor) and negatively charged bacterial surfaces (electron donor).

View larger version (9K): [in this window] [in a new window]   Fig. 4. Equilibrium sorbed concentration (q) vs. pH for sorption of 1,3-dinitrobenzene (spiked at 0.086 mmol L–1) to E. coli in 0.1 mol L–1 NaCl. Bidirectional error bars represent SDs calculated from three replicates.