Transition metal doped TiO₂ mediated photocatalytic degradation of anti-inflammatory drug under solar irradiations

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• 作者：Vibhu Bhatia ; Amit Dhir ; ^{amit.dhir@thapar.edu" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Photocatalysis ; Doped ; Ibuprofen ; Bi&ndash ; TiO2 ; Ni&ndash ; TiO2 ; Solar irradiation
• 刊名：Journal of Environmental Chemical Engineering
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：4
• 期：1
• 页码：1267-1273
• 全文大小：1848 K

文摘

Bismuth (Bi) and Nickel (Ni) Doped Titanium Dioxide (TiO₂) nanoparticles were synthesized by sol–gel method and the prepared nanoparticles were characterized by X-Ray Diffraction, Scanning Electron Microscope, UV–vis reflectance spectroscopy and Brunauer–Emmett–Teller (BET) analysis. The concentration of dopant in synthesized catalysts was varied from 0.25 to 1.0 wt%. Maximum BET surface area of 47.8 and 45.7 m²/g was observed with 0.25 wt% Bi–TiO₂ and 0.5 wt% Ni–TiO₂, respectively. EDX analysis has established the presence of 0.21% Bi ions and 0.36% Ni ions in 0.25 wt% Bi doped TiO₂ and 0.5 wt% Ni doped TiO₂, respectively. Band gap of Bi–TiO₂ (0.25 wt%) and Ni–TiO₂ (0.5 wt%) was obtained to be 2.99 eV, which is found to be minimum among the various synthesized catalysts. The photocatalytic activity of synthesized catalysts were tested and compared with Degussa TiO₂ for degradation of Ibuprofen (IBP) as a model compound. Bi–TiO₂ nanoparticles revealed higher photocatalytic activity when compared to Ni–TiO₂ or Degussa TiO₂ under solar irradiation, which may be attributed to increase in specific surface area, and decrease in the crystallite size. Maximum of 89% degradation was achieved with 0.25% Bi–TiO₂ photocatalyst under 6 h of illuminations with a solar light, whereas, 78% degradation has been achieved under similar experimental condition with Ni doped TiO₂. The kinetics of the degradation of IBP has been explained in terms of the Langmuir–Hinshelwood model and was found to follow first order kinetics with k value of 0.0064 and 0.0046 min⁻¹ with Bi and Ni doped TiO₂, respectively.