Photocatalytic behavior of nanosized TiO2 immobilized on layered double hydroxides by delamination/restacking process

• Published in: Environmental science and pollution research international Vol. 19; no. 9; pp. 3709 - 3718
• Main Authors: Paušová, Šárka, Krýsa, Josef, Jirkovský, Jaromír, Mailhot, Gilles, Prevot, Vanessa
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer-Verlag 01-11-2012; Springer Nature B.V; Springer Verlag
• Subjects: Aluminum - chemistry; Aquatic Pollution; Aqueous solutions; Atmospheric Protection/Air Quality Control/Air Pollution; Azo Compounds - chemistry; Benzenesulfonates - chemistry; Bordeaux; Chemical analysis; Chlorophenol; Chlorophenols - chemistry; Earth and Environmental Science; Ecotoxicology; Environment; Environmental Chemistry; Environmental Health; Environmental Pollutants - chemistry; Environmental Restoration and Remediation - methods; Fourier analysis; Fourier transforms; Hydroxides; Immobilization; Infrared spectroscopy; Magnesium - chemistry; Nanocomposites; Nanoparticles; Nanoparticles - chemistry; Nitrates; Oxidation; p-Chlorophenol; Photocatalysis; Photocatalysis : fundamentals and applications in JEP 2011; Photodegradation; Photolysis; Pollutants; Studies; Sulfide compounds; Titanium - chemistry; Titanium dioxide; Waste Water Technology; Water Management; Water pollution; Water Pollution Control; nanoparticles; Layered double hydroxide; Photocatalysis; 4-Chlorophenol; TiO; Delamination; Orange II; Photocatalysis Layered double hydroxide Delamination TiO2 nanoparticles Orange II 4-Chlorophenol
• ISSN: 0944-1344; 1614-7499
• DOI: 10.1007/s11356-012-0780-9

Introduction
Efficient immobilization of TiO
2
nanoparticles on the surface of Mg
2
Al-LDH nanosheets was performed by delamination/restacking process.
Experimental part
The structural and textural properties of as-prepared nanocomposite were deeply analyzed using different solid-state characterization techniques such as: X-ray powder diffraction, Fourier transform infrared spectroscopy, and Raman spectroscopies, chemical analysis, X-ray photoelecton spectroscopy, N
2
adsorption–desorption, and electronic microscopy.
Results and discussion
The photocatalytic properties of immobilized TiO
2
nanoparticles on Mg
2
Al were investigated using the photodegradation of two model pollutants: Orange II and 4-chlorophenol, and compared with pure colloidal TiO
2
solution.
Conclusion
It appears that Orange II photodegradation was systematically faster and more efficient than 4-chlorophenol photodegradation regardless of the medium pH. Moreover under slightly basic conditions, even if the TiO
2
photocatalytic efficiency decreases, photodegradation performed in presence of easily recovered TiO
2
/Mg
2
Al
1.5
nanocomposite gives rise to comparable or better results than pure TiO
2
.