High efficient solar light photocatalytic degradation of malachite green by solid state synthesized Bi2Sn2O7 and Bi2MxSn2O7 (M = Y3+, Eu3+, Gd3+ and Yb3+) nanomaterials
الموضوعات : Journal of Nanoanalysishassan GHEISARI 1 , Ebrahim Karamian 2 , Ali Soheily 3
1 - Biomaterials Dep, University of Toronto
2 - Advanced Materials Research Center, Department of Materials Engineering, Najafabad Branch, Islamic
Azad University,Najafabad, Iran
3 - Advanced Materials Research Center, Department of Materials Engineering, Najafabad Branch, Islamic
Azad University,Najafabad, Iran
الکلمات المفتاحية: kinetic, Photodegradation, Rietveld, Solid state, Pyrochlore,
ملخص المقالة :
Nanostructured Bi2Sn2O7 and Bi2MxSn2O7 (M = Y3+, Eu3+, Gd3+ and Yb3+)nanomaterials were synthesized by conventional one-step solid state crystalgrowth reactions among Bi(NO3)3, SnCl2 and M2O3 raw materials at 800 ̊C for 10and 15 h. The doped nanomaterials were synthesized to study the capacity of thecrystal system to locate each of the dopant ions into the crystal system cavities.The synthesized nanomaterials were characterized by powder X-ray diffraction(PXRD) technique. Rietveld analysis showed that the obtained materials werecrystallized well in orthorhombic crystal structure with the space group Aba2.The PXRD data revealed that dopant ion type had a considerable influence on thecrystal phase purity of the obtained targets. The morphologies of the synthesizedmaterials were studied by field emission scanning electron microscopy (FESEM)technique. Ultraviolet-visible spectra analysis showed that the synthesizednanomaterials had strong light absorption in the ultraviolet light region.Photocatalytic performance of the synthesized nanomaterials was investigatedfor the degradation of pollutant Malachite Green under solar light condition. Theoptimum conditions were modeled and obtained by design expert software forBi2Sn2O7 that was synthesized at 800 ̊C for 10 h which were 0.06 mL H2O2, 12mg catalyst and 40 min for the removal of 50 mL of 40 ppm MG solution. Thedegradation yield in these conditions was 100 %. The photocatalytic degradationfitted to the Langmuir–Hinshelwood kinetic model. As a result of the model, thekinetic of degradation followed a pseudo-zero-order kinetic model.
