Journal
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
Volume 52, Issue 40, Pages 14441-14448Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ie401193y
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Funding
- Ministry of Education, Culture, Sports, Science and Technology of Japan [23760729]
- Steel Foundation for Environmental Protection Technology
- Grants-in-Aid for Scientific Research [23760729] Funding Source: KAKEN
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In this study, tungsten (W) recovery via biosorption using Escherichia coli was assessed to establish an environmentally friendly recycling system for W. The recovery fraction of soluble W-VI was highly dependent on the solution pH, and E. coli cells exhibited the highest W-VI uptake capacity for an initial pH of 1.08-2.56. Fourier transform infrared analysis revealed that carboxyl and phosphate functional groups on the surface of the bacteria play a crucial role in adsorption of W-VI. Equilibrium and kinetic modeling of W-VI biosorption showed that the equilibrium adsorption data fit the Langmuir isotherm model better than the Freundlich model. Kinetic studies revealed that W-VI adsorption followed a pseudo-second-order rate model. W-VI was recovered by desorption and heating, and adjustment of the pH enabled 95.8% W-VI desorption from the E. coli cells. Heating at 1000 degrees C for 2 h under atmospheric conditions produced concentrates with relatively high concentrations of W-VI (97.1% WO3).
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