화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Journal of Industrial and Engineering Chemistry, Vol.19, No.1, 150-156, January, 2013
DOI10.1016/j.jiec.2012.07.017  Export Citation
Effect of Pt or Pd doping on stability of TiO2 nanoparticle suspension in water
Komkrit Suttiponparnit1, 2, Vinay Tiwari1, Manoranjan Sahu1, Pratim Biswas1, Sirikalaya Suvachittanont3, and Tawatchai Charinpanitkul4, 5, †
  • 1Aerosol and Air Quality Research Laboratory, Department of Energy, Environmental & Chemical Engineering, Washington University in St. Louis, St. Louis, MO 63130, USA
  • 2Department of Chemical Engineering, Center of Excellence in Particle Technology, Department of Chemical Engineering, Faculty of Engineering, Kasetsart University, Chulalongkorn University, 50 Paholyothin Road, Jatujak, Bangkok 10900, Patumwan, Bangkok 10330, Thailand
  • 3Department of Chemical Engineering, Kasetsart University, 50 Paholyothin Road, Jatujak, Bangkok 10900, Thailand
  • 4Center of Excellence in Particle Technology, Department of Chemical Engineering, Faculty of Engineering, Chulalongkorn University, Patumwan, Bangkok 10330, Thailand
  • 5Energy Research Institute, Chulalongkorn University, Patumwan, Bangkok 10330, Thailand
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Stability of suspensions of TiO2 nanoparticles synthesized by the flame aerosol reactor (FLAR) could be altered by doping TiO2 nanoparticles with Pt, Pd, or Pt-Pd dopants. It was found that doping of TiO2 with Pd or Pt could contribute to the control of the agglomeration of TiO2 suspended in water. With the change of doping content, the isoelectric point (IEP) of stable TiO2 suspension decreased gradually from 5 to 3.6 while the specific surface area was increased from 43.27 to 60.84 m2/g. With pH > 6.0, 2 wt% Pt.Pd/TiO2 suspension exhibited the lowest agglomeration behavior. The plausible intrinsic structures of Pt, Pd, and Pt-Pd doped TiO2 nanoparticles were proposed and discussed with respect to their IEP based on the DLVO theory.
Keywords:TiO2;Nanoparticles;Pt;Pd;DLVO theory;Agglomeration;Stability
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