*2.1.11 Magnetic nanoparticles*

Magnetic nanoparticles (MNP) were prepared by chemical co-precipitation and then processed under hydrothermal conditions. Briefly, iron (II) chloride and iron (III) chloride (1:2) were chemically precipitated at room temperature (25°C) by adding 30% ammonium hydroxide at pH=10.0–10.4. The precipitates were heated at 80°C for 35 minutes with continuous stirring and washed in deionized water and ethanol [18].
