Photocatalytic Degradation of Methylene Blue and Methyl Orange over TiO₂ Powder Synthesized via the Solvothermal Method

Abstract

Titanium dioxide (TiO2) powder was synthesized via the solvothermal method. Titanium isopropoxide (C12H28O4Ti), ammonium hydroxide (NH4OH) and nitric acid (HNO3) were used as the starting materials. The mixed solution was diluted with ethanol (C2H5OH) and heated at 100°C for 5h in a Teflon–lined stainless steel autoclave vessel. The phase transition of TiO2 powder was studied by X–ray diffraction (XRD). The morphology and chemical composition of TiO2 powder were investigated by scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). The photocatalytic degradation of methylene blue and methyl orange over TiO2 powder were determined using Ultraviolet–visible spectroscopy (UV–Vis).

Photocatalytic Degradation of Phenol over Highly Visible-Light Active BiOI/TiO2 Nanocomposite Photocatalyst

“…After irradiation, 4 mL of suspension was withdrawn periodically in every 45 min and filtered by a Millipore filter (0.22 m). Then, the phenol solution was dyed by the 4-aminoantipyrine colorimetric method (APHA, 1992) [16]. The maximum absorbance at 504 nm was analyzed using UV-vis spectrophotometer (PG Instruments, T90).…”