The distinct role of boron doping in Sn3O4 microspheres for synergistic removal of phenols and Cr(VI) in simulated wastewater
The powerful photocatalyst is the key for photocatalytic environmental purification via sunlight harvesting and utilization. In this work, novel boron doped Sn3O4 microspheres constructed by nanoplates were designed and fabricated. Density functional theory (DFT) studies were carried out to investigate boron doping mechanism, in which DFT predicted that boron doping would strengthen the light harvesting capability and the photo-responsibility of Sn3O4, which was proved by diffuse reflectance spectra (DRS) and transient photocurrent response. Attributing to unique physical structure, enhanced light harvesting and high utilization of carriers, the boron doped Sn3O4 microsphere exhibited high efficiency for Cr (IV) reduction and azo dyestuffs degradation. Moreover, a surprised synergistic effect for simultaneous removal of phenols (phenol, bisphenol A and p-chlorophenol) and Cr(VI) was obtained.