Photocatalytic degradation of Malachite Green by Sr3MxAl2O6+δ ﴾M=None, Sm3+, Eu3+, Ho3+ and Yb3+) nanomaterials as an excellent and recyclable photocatalyst

As reported in our previous work, Sr3Al2O6 nano powders were synthesized by a one-step solid state reaction using Al﴾NO3)3.6H2O, Sr﴾C2H3O2)2 and Sr﴾NO3)2 at 800 and 900 ̊C for 8 h. For the synthesis of Sr3MxAl2O6+δ ﴾M= Sm3+, Eu3+, Ho3+ and Yb3+) nano powders, Al﴾NO3)3.6H2O, Sr﴾NO3)2, Eu2O3, Ho2O3 and Yb2O3 were used at 800 ̊C for 8 h. In the present work, the photocatalytic performance of Sr3MxAl2O6+δ ﴾M=None, Sm3+, Eu3+, Ho3+ and Yb3+) nanomaterials were investigated for the degradation of Malachite Green (MG) water pollutant in aqueous solution under direct white visible light irradiation with the light power 40 W. The optimum conditions were obtained by design expert software for (5%) Al2O3 - (95%) Sr3Al2O6 (S1). It was found that the optimum conditions were 0.2 mL of H2O2, 20 mg of catalyst, and 40 min. The initial volume and concentration of MG solution were 150 mL and 100 ppm, respectively. It was found that Sr3Al2O6 had excellent efficiency under the optimized conditions at the presence of direct visible light irradiation. The degradation yield in the optimized conditions was 100 %.