Abstract
Attapulgite (or palygorskite) is a magnesium aluminium phyllosilicate. Modified
attapulgite-supported
nanoscale zero-valent iron (NZVI) was created by a liquid-phase reduction method and then applied
for nitrate-nitrogen (NO3-N) removal (transformation) in simulated groundwater. Nanoscale
zero-valent iron was sufficiently dispersed on the surface of thermally modified attapulgite. The
NO3-N removal
efficiency reached up to approximately 83.8% with an initial pH values of 7.0. The corresponding
thermally modified attapulgite-supported nanoscale zero-valent iron (TATP-NZVI) and NO3-N
concentrations were 2.0 g/L and 20 mg/L respectively. Moreover, 72.1% of the water column NO3-N was
converted to ammonium-nitrogen (NH4-N) within 6 h. The influence of environmental boundary
conditions including dissolved oxygen (DO) concentration, light illumination and water temperature
on
NO3-N removal was also investigated with batch experiments. The results indicated that the DO