Following this, the synthesized NZVI particles were suspended
in the reaction solution, needing to be collected and washed out
of the reagents. After the reaction solution was removed, the
NZVI particles remained and were washed with deionized water
three times in order to clean up the residual reagent of NZVI
particles. A magnet was utilized to collect the NVZI particles
with magnetic and gravity force to avoid washing loss each
time