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Contributions of adsorption, bioreduction and desorption to uranium immobilization by extracellular polymeric substances

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Frontiers of Environmental Science & Engineering 2023年第9期17卷 125-135页

作者： Chen Zhou ermias gebrekrstos tesfamariam Youneng Tang Ang Li Biodesign Swette Center for Environmental Biotechnology Arizona State UniversityTempeAZ 85281USA Department of Civil and Environmental Engineering FAMU-FSU College of EngineeringFlorida State UniversityTallahasseeFL 32310USA State Key Laboratory of Urban Water Resource and Environment School of EnvironmentHarbin Institute of TechnologyHarbin 150090China

Hexavalent uranium(U(VI))can be immobilized by various *** role of extracellular polymeric substances(EPS)in U(VI)immobilization has not been *** work provides a model framework to quantify the contributions of three processes involved in EPS-mediated U(VI)immobilization:adsorption,bioreduction and *** associated EPS was extracted from a pure bacterial strain,Klebsiella sp.J1,and then exposed to H_(2) and O_(2)(no bioreduction control)to immobilize U(VI)in batch experiments.U(VI)immobilization was faster when exposed to H_(2) than O_(2) and stabilized at 94%for H_(2) and 85%for O_(2),*** non-equilibrium data from the H_(2) experiments were best simulated by a kinetic model consisting of pseudo-second-order adsorption(ka=2.87×10^(−3) g EPS·(mg U)^(−1)·min^(−1)),first-order bioreduction(kb=0.112 min−1)and first-order desorption(kd=7.00×10^(−3) min^(−1))and fitted the experimental data with R^(2) of *** adsorption was dominant in the first minute of the experiments with H_(2),bioreduction was dominant from the second minute to the 50th *** 50 min,adsorption was negligible,and bioreduction was balanced by *** work also provides the first set of equilibrium data for U(VI)adsorption by EPS *** equilibrium experiments with O_(2) were well simulated by both the Langmuir isotherm and the Freundlich isotherm,suggesting multiple mechanisms involved in the interactions between U(VI)and *** thermodynamic study indicated that the adsorption of U(VI)onto EPS was endothermic,spontaneous and favorable at higher temperatures.

关键词： Adsorption Bioreduction Desorption Kinetics Isotherm Uranium

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