Figure 9.
Slow-release of iron ions from the three types of zeolite/Fe2O3–NCs against mixing time. Three types of zeolite/Fe2O3–NCs were synthesized from three types of zeolites as: 1 – Synthetic zeolite (96096, Potassium, 3A° type) from Sigma-Aldrich, USA; 2 – Commercial zeolite (Clinoptilolite type) from Helitropfen, Germany (origin was a Narvik mine in Norway); and 3-Commercial zeolite (Desica AC130 type) from Hitech Silicate Co, IRAN.