Synthesis of immobilised Ni-doped TiO₂ nanoparticles through hydrothermal route and their efficiency evaluation in photodegradation of formaldehyde

ABSTRACT

The aim of the present study was to synthesis Ni-doped TiO₂ nanoparticles (NPs) in order to evaluate their effectiveness in photocatalytic degradation of formaldehyde in the aqueous phase. The Ni-doped TiO₂ NPs were synthesised using a mild hydrothermal method. They were then immobilized on glass plates by the calcination method. Characterisation of Ni-doped TiO₂ NPs was also carried out using scanning electron microscopy (SEM) and X-ray diffraction (XRD) analyses. The SEM images showed the uniform distribution of as-synthesised NPs on the surface of glass plates, with multidimensional crystalline structures. The results indicated that increasing the dopant weight ratio to 0.7% enhanced the photocatalytic degradation efficiency of formaldehyde; however, a further increase in the dopant weight ratio reduced the process efficacy. According to the results, increasing the initial pH from acidic and neutral to alkaline conditions decreased the efficacy of the process. Furthermore, the results showed that increasing the amount of nanocatalyst and decreasing the initial concentration of formaldehyde favoured the photocatalytic degradation of formaldehyde.

KEYWORDS:

• Formaldehyde
• photocatalytic degradation
• nanoparticles
• doping
• immobilization

Acknowledgments

This study was extracted from a research project approved by Kurdistan University of Medical Sciences. The authors would like to thank the Vice Chancellor for Research and Technology of Kurdistan University of Medical Sciences for the financial support.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This study was funded by Kurdistan University of Medical Sciences.