Untitled

Crışan, Maria; Zaharescu, M.; Crışan, D.; Ion, Rodica Mariana; Manolache, Mihaela

doi:10.1023/a:1008625929465

Cited by 10 publications

(3 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Therefore, the vibrational modes observed in the range below 700 cm −1 were mainly due to the titanate network. The characteristic vibrations of TiO6 structural units in TiO2 (anatase) were at 640 and 450 cm −1 [20,45,46]. The bands in the range of 700-670 cm −1 observed in the spectra of samples A and B could be related to the symmetric TeO3 units [47], while deformed TeO4 groups exhibited a strong absorption band at 635 cm −1 and a shoulder at 670 cm −1 .…”

Section: Structural Change Ir and Uv-vis Spectra 331 Ir Investigationsmentioning

confidence: 94%

Effect of B2O3 on the Structure, Properties and Antibacterial Abilities of Sol-Gel-Derived TiO2/TeO2/B2O3 Powders

Bachvarova-Nedelcheva,

Iordanova,

Stoyanova

et al. 2023

Materials

View full text Add to dashboard Cite

This paper studies the influence of B2O3 on the structure, properties and antibacterial abilities of sol-gel-derived TiO2/TeO2/B2O3 powders. Titanium(IV) butoxide, telluric(VI) acid and boric acid were used as precursors. Differences were observed in the degree of decomposition of Ti butoxide in the presence of H3BO3 and H6TeO6 acids. The phase transformations of the obtained gels in the temperature range of 200–700 °C were investigated by XRD. Composite materials containing an amorphous phase and different crystalline phases (metallic Te, α-TeO2, anatase, rutile and TiTe3O8) were prepared. Heating at 400 °C indicated a crystalline-to-amorphous-phase ratio of approximately 3:1. The scanning electron microscopy (SEM) analysis showed the preparation of plate-like TiO2 nanoparticles. The IR results showed that the short-range order of the amorphous phases that are part of the composite materials consists of TiO6, BO3, BO4 and TeO4 structural units. Free B2O3 was not detected in the investigated compositions which could be related to the better connectivity between the building units as compared to binary TiO2/B2O3 compositions. The UV-Vis spectra of the investigated gels exhibited a red shift of the cut-off due to the presence of boron and tellurium units. The binary sample achieved the maximum photodegradation efficiency (94%) toward Malachite green dye under UV irradiation, whereas the ternary sample photoactivity was very low. The compositions exhibited promising antibacterial activity against E. coli NBIMCC K12 407.

show abstract

Section: Structural Change Ir and Uv-vis Spectra 331 Ir Investigationsmentioning

confidence: 94%

Effect of B2O3 on the Structure, Properties and Antibacterial Abilities of Sol-Gel-Derived TiO2/TeO2/B2O3 Powders

Bachvarova-Nedelcheva,

Iordanova,

Stoyanova

et al. 2023

Materials

View full text Add to dashboard Cite

show abstract

“…We have previously published results on films of pure TiO 2 [22][23][24] and TiO 2 doped with transitional metal ions (copper, cobalt, vanadium, iron) [25][26][27] obtained by solgel methods.…”

Section: Introductionmentioning

confidence: 99%

Sol–gel S-doped TiO2 materials for environmental protection

Crışan

Brăileanu

Răileanu

et al. 2008

Journal of Non-Crystalline Solids

Self Cite

View full text Add to dashboard Cite

“…[3] Tremendous efforts have been made to produce TiO 2 photocatalyst that is capable of effective utilization of visible light. One way is to activate TiO 2 in the visible light region by depressing the TiO 2 band gap via doping with either metal ions (Fe, [4][5] Cr, [6][7] Co, [8][9] Cu, [9] and V [10] ) or non metal species such as C, [11,12] N, [13,14] F, [15,16] B, [17] and S [18,19] .…”

mentioning

confidence: 99%

Green preparation of visible light active titanium dioxide films

Wellia¹

View full text Add to dashboard Cite

The thesis focuses on the fabrication of visible light active TiO 2-based thin film photocatalyst, via a green method, for self-cleaning and potentially other solar energy harvesting applications. TiO 2 is chosen due to its attractive attributes of being inexpensive, nontoxic, photocatalytically active, chemically stable and broad application especially in degrading organic pollutants. However, TiO 2 can only be activated under UV light due to the wide band gap of TiO 2 (3.2 eV). This limits its widespread applications since ultraviolet is only a small part of solar energy (approximately 4%) and almost non-existent in indoor lighting. Transparent, uniform, crack free and visible light-activated single element doped TiO 2 films (N-doped TiO 2 and Fe-doped TiO 2) were successfully fabricated. The precursors were prepared using a "green" aqueous Peroxo Titanic Acid (PTA) solution approach and coated on the glass substrate using hydrophilicity-assisted method. The optimal photocatalytic activity of the N-doped TiO 2 films was about 9.5 and 13.6 times higher than that of un-doped TiO 2 coated glass and commercial self-cleaning glass, respectively. The optimal photocatalytic activity of the Fe-doped TiO 2 films was about 4 times higher than that of un-doped TiO 2. The improvement of photocatalytic activity was mainly due to enhanced visible light absorption by N or Fe doping which is attributed to bandgap narrowing as observed from absorption redshift. ACKNOWLEDGMENTS Firstly, I would like to thank God for His blessing so that I could finally finish this thesis. I would like to thank my supervisor Associate Professor Timothy Tan for his inexhaustible patience, valuable guidance, advice, support and encouragement throughout my research and for the completion of my study and the thesis. I would also like to thank my co-supervisor Dr. Tuti Mariana Lim for her attention, advice, support and reminder to work on the right track of this research. I am especially thankful to Dr. Xu Qing-chi who had contributed mainly in project idea and data analysis for the works on N-doped TiO 2 , C-N-codoped TiO 2 and Bi 2 WO 6 / TiO 2 heterojunctions. I would also like to thank him for his assistance, fruitful discussions, patience, and always willing to teach, support and help me.

show abstract

Untitled

Cited by 10 publications

References 4 publications

Effect of B2O3 on the Structure, Properties and Antibacterial Abilities of Sol-Gel-Derived TiO2/TeO2/B2O3 Powders

Effect of B2O3 on the Structure, Properties and Antibacterial Abilities of Sol-Gel-Derived TiO2/TeO2/B2O3 Powders

Sol–gel S-doped TiO2 materials for environmental protection

Green preparation of visible light active titanium dioxide films

Contact Info

Product

Resources

About