Synthesis and characterization of TiO2 quantum dots for photocatalytic application

Gnanasekaran, Lalitha; Hemamalini, R.; Ravichandran, K.

doi:10.1016/j.jscs.2015.05.002

Cited by 83 publications

(21 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…TiO 2 is also a wide energy bandgap material, typically displaying optical bandgaps of 3.0 and 3.2 eV for rutile and anatase, respectively, and varying from 3.13 to 3.40 eV for brookite [18,19]. Both metal oxides are environmentally friendly, earth abundant, chemically stable, low-cost, nontoxic, and compatible with wetchemical synthesis routes [20][21][22][23]. For both materials above described, there are several reports describing the use of hydrothermal/solvothermal synthesis to produce them [24][25][26][27], while more recently assisted process methods by microwave irradiation have been deeply exploited [28][29][30].…”

Section: Introductionmentioning

confidence: 99%

Paper-Based Nanoplatforms for Multifunctional Applications

Matias

Nunes

Pimentel

et al. 2019

Journal of Nanomaterials

View full text Add to dashboard Cite

In this work, zinc oxide (ZnO) and titanium dioxide (TiO 2 ) nanostructures were grown on different cellulose paper substrates, namely, Whatman, office, and commercial hospital papers, using a hydrothermal method assisted by microwave irradiation. Pure ZnO and TiO 2 nanostructures were synthesized; however, the growth of TiO 2 above ZnO was also investigated to produce a uniform heterostructure. Continuous ZnO nanorod arrays were grown on Whatman and hospital papers; however, on office paper, the formation of nanoplates originating nanoflower structures could be observed. TiO 2 nanoparticles homogeneously covered all the substrates, in some conditions forming uniform TiO 2 films. Structural characterization was carried out by scanning electron microscopy (SEM) coupled with energy-dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), and Raman spectroscopy. The optical characterization of all the materials was carried out. The produced materials were investigated for multifunctional applications, like photocatalyst agents, bacterial inactivators, and ultraviolet (UV) sensors. To evaluate the photocatalytic activity under UV and solar radiations, rhodamine B was the model-test contaminant indicator and the best photocatalytic activity was achieved with Whatman paper. Hospital paper with TiO 2 nanoparticles showed significant antibacterial properties against Staphylococcus aureus. ZnO-based UV sensors demonstrated a responsivity of 0.61 μA W -1 .

show abstract

Section: Introductionmentioning

confidence: 99%

Paper-Based Nanoplatforms for Multifunctional Applications

Matias

Nunes

Pimentel

et al. 2019

Journal of Nanomaterials

View full text Add to dashboard Cite

show abstract

“…In this regard, a variety of synthetic methods to prepare TiO 2 xerogel and aerogel have been utilized while varying the pH of solution (acid-catalyzed or basic-catalyzed) and the drying processes such as supercritical (aerogel) or conventional drying (xerogel). The application of TiO 2 in photodegradation of organic pollutants in water has also been discussed in literature [35][36][37][38][39][40][41][42][43][44][45][46][47][48] and it is reported that surface, structural properties and photocatalytic efficiency depend strongly on the method used for the preparation of materials. However, there is no direct correlation between surface proprieties and photoactivity of TiO 2 [49].…”

Section: Introductionmentioning

confidence: 99%

Sol–gel synthesis of highly TiO2 aerogel photocatalyst via high temperature supercritical drying

Moussaoui

Elghniji

Mosbah

et al. 2017

Journal of Saudi Chemical Society

View full text Add to dashboard Cite

Nanocrystalline powders of TiO 2 xerogel and aerogel were prepared by using acidmodified sol-gel approach. For TiO 2 aerogel material (TA), the solvent was high temperature supercritically extracted at 300°C and 100 bars. However, the TiO 2 xerogel material (TX) was dried at 200°C and ambient pressure. The effects of the drying processes on the crystalline structure, phase transformation and grain growth were determined by Raman spectroscopy, SAED and Xray diffraction (XRD) analyses using Rietveld refinement method. The TiO 2 aerogel was composed of anatase crystalline structure. The TiO 2 xerogel material was composed of anatase, brookite and small amount of amorphous phase with anatase as dominant phase. The TX sample still contains a relatively high concentration of carbon than that of TA, indicating the amorphous character of TiO 2 xerogel. These materials were applied as catalyst for the degradation of indigo carmine in aqueous medium. Photo-degradation ability of TA and TX was compared to the TiO 2 commercial Degussa P25. The photo-catalytic results showed that the degradation efficiency was in the order TA > P25 > TX. The photo-degradation of indigo carmine followed pseudo first order reaction kinetics. Ó 2017 King Saud University. Production and hosting by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

show abstract

“…This shows that the presence of BEN-PVAG as the adsorbent sub-layer for P-25TiO 2 in the fabrication of P-25TiO 2 / BEN-PVAG/GP lowered the crystallinity of the photocatalyst, potentially due to the presence of the polymeric binders. The XRD pattern of P-25TiO 2 /BEN-PVAG/GP shows diffraction peaks at 2h = 25.3°, 37.8°, 48.0°, 53.9°, 55.1°, 62.6°, 66.3°, and 68.9°which correspond to the (101), (103), (200), (105), (211), (213), (116), and (220) crystalline plane of the anatase phase, respectively (Gnanasekaran et al 2015). Other peaks at 2h = 27.5°and 41.4°are attributed to the (110) and (111) diffraction planes of rutile.…”

Section: Resultsmentioning

confidence: 99%

“…Removal techniques of dye molecules from waste water include physical (Eren 2009;Silva et al 2012), chemical (Nawi and Sabar 2012;Saravanan et al 2013) and biological processes (López et al 2006;Selvakumar et al 2010). Among these methods, adsorption using porous materials and heterogeneous photocatalysis (Gnanasekaran et al 2015) had been demonstrated as promising techniques.…”

Section: Introductionmentioning

confidence: 99%

Role of bentonite adsorbent sub-layer in the photocatalytic-adsorptive removal of methylene blue by the immobilized TiO2/bentonite system

Ngoh

Nawi

2016

Int. J. Environ. Sci. Technol.

View full text Add to dashboard Cite

An immobilized clay composite (BEN-PVAG) on a glass plate (GP) was fabricated using bentonite powder (BEN) and glutaraldehyde cross-linked polyvinyl alcohol (PVAG) as the adsorbent and adhesive, respectively. The immobilized bentonite composite (BEN-PVAG) was characterized using SEM, EDX, FTIR, and BET analysis. The adsorption capacity of BEN-PVAG was examined using methylene blue (MB) as the model pollutant. The results indicated that the adsorption of MB onto BEN-PVAG obeyed pseudo-second-order kinetics. In addition, the adsorption of MB by the immobilized BEN-PVAG was controlled by intra-particle diffusion. In contrast, the adsorption of MB by the suspended BEN-PVAG composite was dominated by film diffusion. The immobilized BEN-PVAG was then applied as the adsorbent sublayer for the fabrication of P-25TiO 2 /BEN-PVAG/GP bilayer system where P-25TiO 2 was deposited as the top layer. The fabricated bilayer system exhibited synergistic photocatalytic-adsorptive removal of MB upon irradiation with a light source, while experiment in the dark yielded only adsorption process. The rate of the synergistic photocatalytic-adsorptive removal of MB by the P-25TiO 2 / BEN-PVAG/GP was 5.3 times faster than the suspended P-25TiO 2 . The result implied the positive impact of the BEN-PVAG adsorbent sub-layer on the immobilized P-25TiO 2 photocatalyst. Most important, the immobilized P-25TiO 2 /BEN-PVAG/GP provided a convenient reuse of the catalyst over time where the treated water could be directly discharged without the need of filtration.

show abstract

Synthesis and characterization of TiO2 quantum dots for photocatalytic application

Cited by 83 publications

References 22 publications

Paper-Based Nanoplatforms for Multifunctional Applications

Paper-Based Nanoplatforms for Multifunctional Applications

Sol–gel synthesis of highly TiO2 aerogel photocatalyst via high temperature supercritical drying

Role of bentonite adsorbent sub-layer in the photocatalytic-adsorptive removal of methylene blue by the immobilized TiO2/bentonite system

Contact Info

Product

Resources

About