Removal of chromium (VI) from aqueous solution by PBTCA-stabilized nanoscale zero valent iron
PBTCA稳定零价纳米铁的制备及其去除水中Cr(Ⅵ)

PBTCA (2-phosphonobutane-1,2,4-tricarboxylic acid)-stabilized nanoscale zero-valent iron (P-NZVI) and nanoscale zero-valent iron (N-NZVI) were synthesized by borohydride reduction method.They were characterized by the transmission electron microscope (TEM),scanning electron microscope (SEM) and X-ray diffraction (XRD).The average size of P-NZVI particles was about 73 nm in diameter.The P-NZVI and N-NZVI particles were tested for reduction of Cr(VI) in water.The experiments investigated the effects of initial Cr(VI) concentration,pH,NZVI dosage and reaction temperature on the removal efficiency of Cr(VI).The results show that the removal efficiency of Cr(VI) increases with the increase in temperature and NZVI dosage but decreases with the increase in pH and initial Cr(VI) concentration.The better Cr(VI) removal rate demonstrates that P-NZVI has the potential to become an effective agent for in situ subsurface environment remediation.