| Abstrakt: |
In order to investigate the removal performance and mechanism of uranium (U(VI)) by nanoscale zero-valent iron loaded on sludge-based biochar (nZVI/SB), the laboratory experiment, which highlighted the ambient effects on U(VI) removal, was carried out. As a result, the findings suggeted that under the conditions: initial pH value of 5, dosage of 0.2 g/L, temperature of 313 K, and adsorption time of 4 h, adsorption of U(VI) onto nZVI/SB attained a maximum capacity of 231.80 mg/g, and the adsorption process conformed to the pseudo-second-order kinetics and the Langmuir adsorption isotherm model. As to the mechanism of U(VI) removal by nZVI/SB, by means of analysis using scanning electron microscopy, energy dispersive analysis, X-ray diffraction and X-ray photoelectron spectroscopy, it was found that the adsorption and reduction mainly contributed the removal of U( VI). Besides, the removal efficiency of U( VI) by nZVI / SB remained above 90% even after five cycles of tests, indicating that nZVI/SB composite possessed a good potential for the treatment of U(VI)-containing wastewater. [ABSTRACT FROM AUTHOR] |
