Details

Autor(en) / Beteiligte

• Vranjes, Mila
• Saponjic, Zoran V
• Zivkovic, Ljiljana S
• Despotovic, Vesna N
• Sojic, Daniela V
• Abramovic, Biljana F
• Comor, Mirjana I

Titel

Elongated titania nanostructures as efficient photocatalysts for degradation of selected herbicides

Ist Teil von

• Applied catalysis. B, Environmental, 2014-11, Vol.160-161, p.589-596

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2014

Quelle

Elsevier ScienceDirect Journals

Beschreibungen/Notizen

• •Titania nanotubes were used for obtaining elongated nanoparticles by calcination.•Shapes, sizes and crystalline phases were dependent on calcination temperatures.•Photocatalytic degradation of clomazone was the fastest when TNT-700 was used.•Elongated titania nanostructures can be used for degradation of herbicides.•Mineralization of picloram was more efficient using TNT-700 as catalyst than P25. Titanium dioxide nanotubes (TNT) were synthesized via hydrothermal method and calcined at various temperatures. The obtained calcined TiO2 nanomaterials with specific elongation orientation were characterized by transmission and scanning electron microscopy (TEM, SEM), X-ray diffraction (XRD), UV/Vis diffuse reflection spectroscopy (DRS), Laser Doppler electrophoresis (LDE) and their textural properties were evaluated. The photocatalytic activity of obtained nanopowders was evaluated considering photodegradation rate of herbicide clomazone, rarely studied herbicide. The influence of calcination temperature of catalysts with elongated morphology on their photocatalytic activity was evaluated. The best results were obtained with TNT annealed at 700°C, which can be assigned to the best balance between crystal structure, morphology and surface properties of nanoparticles induced by annealing. Also, the photocatalytic degradation rates of another two herbicides (picloram, and mecoprop) were compared, due to possibility that the efficiency of photocatalytic degradation is greatly influenced by the molecular structure. The mineralization degree of selected herbicides in the presence of TiO2 based photocatalysts was evaluated applying total organic carbon (TOC) measurements.