Visible-Light-Induced Photodegradation of Methylene Blue Using Mn,N-codoped ZrTiO4 as Photocatalyst

Composites of manganese and nitrogen-codoped zirconium titanate (Mn,Ncodoped
ZrTiO4) had been synthesized by the sol-gel method as a visible-light responsive
photocatalyst for the photodegradation of methylene blue (MB). Synthesis was conducted
at 25 °C using titanium(IV) isopropoxide, zirconium oxide, urea, and manganese(II)
chloride. Mn,N-codoped ZrTiO4 containing fixed 10% nitrogen dopant (wN/wTi) with
various Mn dopant contents (2, 4, 6, 8, and 10% wMn/wTi) and calcination temperatures
(500, 700, and 900 °C) had been investigated. All of the Mn,N-codoped ZrTiO4 exhibit a
band gap within the visible range (2.51 to 2.74 eV). Photodegradation of MB was
performed under visible light illumination for 120 min. The highest activity was achieved
up to 7.7 μg L−1 min−1, which was obtained from Mn,N-codoped ZrTiO4 calcined at
500 °C containing 6% Mn and 10% N dopants