TiO2 nanoparticles prepared by hydrolysis-polycondensation of Titanium oxysulfate (TiOSO4) and hydrothermally crystallized, often has residue sulphate ion as an impurity which is detrimental for photocatalytic activity of TiO2. Simple washing doesn't really help. Anyone with an idea as to how I can get rid of sulphate ions?
Dear Ullah
Unfortunately, you may not after you have already synthesis the particle form of it. Because as if i understand the information you have introduced, the source of the sulfate ions is precursor itself, which means that the sulfate ions has been distributed into the particles. To wipe out the sulfate ions you have to destroy the particle structure. But there may be a small chance to accomplish it. But can not guarantee you the stability of the particles shape and stability, not even the total purification. There may be way that i can suggest you through a personal mail.
Please feel free to contact
Kind Regards.
Kerem
Dear karem
Thanks for the answer. In fact, the Sulphates Ions present on the surface are more important for photocatalysis. I read an articles where the Authors used NH4OH to wash the TiO2 prepared with TiOSO4 and they could get rid of some, but only after high temperature thermal treatment. I dont want to go for high temperature treatments. Anyway, thanks for the comments.
Dear Ullah,
I suggest taht you start with one of the publications of Anpo et al. Both for Rutil und Anatas good procedures were published.
M. Anpo, S. Dohshi, M. Kitano, Y. Hu, M. Takeuchi, M. Matsuoka, The preparation and characterization of highly efficient titanium oxide-based photofunctional materials, Annual Review of Materials Research 2005, 35, 1.
M. Anpo, Preparation, characterization, and reactivities of highly functional titanium oxide-based photocatalysts able to operate under UV-visible light irradiation: Approaches in realizing high efficiency in the use of visible light, Bull. Chem. Soc. Jpn. 2004, 77, 1427.
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