期刊
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
卷 163, 期 -, 页码 544-550出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.ecoenv.2018.07.082
关键词
Nanoscale zero-valent iron/nickel; Green synthesis; Hexavalent chromium; Green tea extracts; Kinetics; Thermodynamics
资金
- National Natural Science Foundation of China [21276174]
- Natural Science Foundation of Shanxi province [2013011040-1]
Nanoscale zero-valent iron/nickel (GT-nZVI/Ni) was prepared by green synthesis technology using green tea extracts in this study. The obtained material was characterized by Scanning Electron Microscopy (SEM), X-ray Diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and BET analyses. Batch experiments were carried out to investigate the effect of pH, initial concentration of Cr(VI), temperature and co-existing anions(CO32-, HCO3-, SO42- and NO3-) on the removal efficiency of Cr(VI) in groundwater. Results showed that 100% Cr(VI) was removed from the aqueous solution containing 5 mg L-1 of Cr(VI) in 30 min when pH value was 5 and reaction temperature was 303 K. Temperature and pH value had a significant effect of reduction rate of Cr(VI). The presence of co-existing anions (CO32-, HCO3-, SO42- and NO3-) inhibited the removal of Cr(VI) by GT-nZVI/ Ni and the most significant one was CO32-, the removal efficiency of Cr(VI) decreased to 52.9% when the concentration of CO32- was 10 mmol L-1. The adsorption behavior of Cr(VI) fitted better with Langmuir-Hinshelwood first order reaction kinetic model. Thermodynamic studies indicated the process was spontaneous and endothermic(Delta G degrees < 0, Delta S degrees > 0, Delta H degrees > 0). Therefore, this study provides a reference for further research of GT-nZVI/Ni and practical application of GT-nZVI/Ni in groundwater treatment.
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