Nitrogen-doped TiO2/AC bi-functional composite prepared by two-stage calcination for enhanced synergistic removal of hydrophobic pollutant using solar irradiation

作者：Yap Pow Seng; Lim Teik Thye^*; Srinivasan Madhavi

来源：Catalysis Today, 2011, 161(1): 46-52.

DOI：10.1016/j.cattod.2010.09.024

• Titania
• Nitrogen doping
• Activated carbon
• Photocatalytic degradation
• Hydrophobic pollutants
• Solar irradiation

Sol-gel method with the incorporation of two-stage calcination protocol was developed to synthesize a bi-functional composite, viz. nitrogen-doped titanium dioxide supported on activated carbon (NTiO2/AC). Various types of N-TiO2/AC composites produced using different calcination conditions were characterized using XRD, porosimetry, XPS, SEM and TEM. All the N-TiO2/AC composites exhibited good adsorption of a hydrophobic pollutant (bisphenol-A (BPA) as model pollutant) in water. The effects of calcination conditions, light wavelength and composite dosage on photocatalytic degradation (PCD) performance were investigated. N-TiO2/AC (400M-700T) composite produced from two-stage calcination (400 degrees C in air with subsequent 700 degrees C in NH3/N-2 atmosphere) was comprised of anatase-rutile phase and this composite exhibited significant PCD efficiency for removing BPA under simulated solar irradiation, with initial pseudo first-order rate constant of ca. 0.67 h(-1). In addition, the N-TiO2/AC composite exhibited satisfactory BPA removal performance over several series of reuse. Photostability of the N-TiO2/AC composite was also examined to address its durability under prolonged exposure of UV irradiation. The amount of carbon being leached in water was found to be less than 0.1% after 6 h of UV irradiation.

• 出版日期2011-3-17
• 单位南阳理工学院