scholarly journals SELF-CLEANING GLASS BASED ON ACID-TREATED TiO2 FILMS WITH PALMITIC ACID AS MODEL POLLUTANT

2010 ◽  
Vol 8 (2) ◽  
pp. 200-206
Author(s):  
Nurul Hidayat Aprilita ◽  
Indriana Kartini ◽  
Sofy Herawati Ratnaningtyas
Keyword(s):  
Thin Film ◽  
Photocatalytic Activity ◽  
Palmitic Acid ◽  
Uv Radiation ◽  
Acid Treatment ◽  
Tio2 Films ◽  
Sem Images ◽  
Self Cleaning ◽  
Radiation Time

Preparation and characterization of self-cleaning glass based on acid-treated TiO2 films as well as evaluation on their self-cleaning properties have been carried out. Palmitic acid photodegradation was used as model pollutant. Acid-treated TiO2 powders were deposited on glass surface by using spraying technique. The XRD results showed that acid-treated TiO2 film exhibited decreased anatase crystalline size. The corresponding SEM images showed porous surface morphology. Layer densification was observed as the film thickness increased. TiO2 photocatalytic activity increased as the length of UV radiation increased. Best results were obtained at experimental condition of 35 hours UV radiation time. It is also observed that the thickness of TiO2 layers influenced the efficiency of palmitic acid photodegradation. The film with 1.661 µm thick TiO2 layers and 6.933 mg weight (0.7164 mg/cm2) could degrade 97.54 % mg palmitic acid/cm2 thin film.   Keywords: TiO2 films, acid treatment, self-cleaning glass

scholarly journals Effect of annealing and UV-radiation time over micropore architecture of self-assembled block copolymer thin film

2015 ◽  
Vol 9 (6) ◽  
pp. 525-535 ◽  
Author(s):  
G. del C. Pizarro ◽  
O. G. Marambio ◽  
M. Jeria-Orell ◽  
C. M. Gonzalez-Henriquez ◽  
M. Sarabia-Vallejos ◽  
...  
Keyword(s):  
Thin Film ◽  
Block Copolymer ◽  
Uv Radiation ◽  
Self Assembled ◽  
Radiation Time

scholarly journals The synthesis and characterization of ytterbium-doped TiO2 hollow spheres with enhanced visible-light photocatalytic activity

RSC Advances ◽  
2017 ◽  
Vol 7 (40) ◽  
pp. 24598-24606 ◽  
Author(s):  
Xueliang Jiang ◽  
Chenjian Li ◽  
Song Liu ◽  
Fuqing Zhang ◽  
Feng You ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Hollow Spheres ◽  
Synthesis And Characterization ◽  
Melamine Formaldehyde ◽  
Sem Images ◽  
Doped Tio2 ◽  
Tio2 Hollow Spheres ◽  
Visible Light Photocatalytic

SEM images of Melamine-formaldehyde polymer microspheres (MF) (a) and Yb-doped TiO2 hollow spheres (Yb-TiO2HS) (b).

scholarly journals Preparation and characterization of protective self-cleaning TiO2/kaolin composite coating

2018 ◽  
Vol 68 (331) ◽  
pp. 163
Author(s):  
V. Jovanov ◽  
V. Zečević ◽  
T. Vulić ◽  
J. Ranogajec ◽  
E. Fidanchevska
Keyword(s):  
Photocatalytic Activity ◽  
Composite Coating ◽  
Building Materials ◽  
Support Surface ◽  
Tio2 Content ◽  
Cleaning Efficiency ◽  
Before And After ◽  
Self Cleaning ◽  
Highly Porous

The application of self-cleaning coatings presents one of the most effective ways to protect the surfaces of the building materials. The effect of TiO2/kaolin based coatings applied to three types of substrates: non-porous, porous and highly porous, was investigated. Mechanical activation was applied for the impregnation of the active TiO2 component (in content of 3 and 10 wt. %) into the kaolin support. Surface properties (roughness, hydrophilicity and micro-hardness) and functional properties (photocatalytic activity and self-cleaning efficiency) were studied in order to define the optimal formulation of the applied coatings. The effect of the photocatalytic behavior of the coated substrates in terms of self-cleaning ability was assessed by the photodegradation of Rhodamine B, performed before and after durability tests. The results obtained in this paper showed that photocatalytic activity of the TiO2/kaolin composite coating generally depends on the procedure of TiO2 impregnation into the kaolin clay and the loaded TiO2 content.

scholarly journals Black TiO2 Thin Films Production Using Hollow Cathode Hydrogen Plasma Treatment: Synthesis, Material Characteristics and Photocatalytic Activity

Catalysts ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 282 ◽  
Author(s):  
Armstrong Godoy Junior ◽  
André Pereira ◽  
Marcilene Gomes ◽  
Mariana Fraga ◽  
Rodrigo Pessoa ◽  
...  
Keyword(s):  
Thin Film ◽  
Photocatalytic Activity ◽  
Tio2 Film ◽  
Hollow Cathode ◽  
Hydrogen Plasma ◽  
Visible Region ◽  
Morphological Properties ◽  
Tio2 Films ◽  
X Ray ◽  
Black Tio2

Black TiO2 materials have been quite widely explored due to their large solar absorption and superior photocatalytic activity. In this paper, the blackening process of titanium dioxide (TiO2) thin film using the hollow cathode hydrogen plasma (HCHP) technique is reported. First, pristine anatase TiO2 films were grown by magnetron sputtering onto silicon and cover glass substrates and then annealed at 450 °C for 2 h. Then, the as-grown TiO2 films were treated with HCHP for 15 min. The physical, chemical and morphological properties of the films were analyzed by profilometry, X-ray diffraction (XRD), UV-Vis spectrophotometry, Raman spectroscopy, X-ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM) techniques. Electrical and photocatalytic measurements were performed by four-point probe and methylene blue UV degradation assays, respectively. The results showed that the black TiO2 film is highly absorbent in the UV-visible region, has low electrical resistance and greater surface area compared to the non-treated TiO2 film. These properties of black TiO2 film, as well as its performance as a photocatalytic agent, were investigated, indicating the superior quality of this material in thin film form and the promising potential of the HCHP treatment to produce hydrogenated TiO2 in short process time.

scholarly journals Thickness Effect on Photocatalytic Activity of TiO2 Thin Films Fabricated by Ultrasonic Spray Pyrolysis

Catalysts ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1058
Author(s):  
Ibrahim Dundar ◽  
Arvo Mere ◽  
Valdek Mikli ◽  
Malle Krunks ◽  
Ilona Oja Acik
Keyword(s):  
Thin Films ◽  
Photocatalytic Activity ◽  
Film Thickness ◽  
Stearic Acid ◽  
Spray Pyrolysis ◽  
Ultrasonic Spray Pyrolysis ◽  
Tio2 Films ◽  
Tio2 Thin Films ◽  
Ultrasonic Spray ◽  
Self Cleaning

In this study, TiO2 thin films were deposited by ultrasonic spray pyrolysis from solutions with concentrations of 0.1 and 0.2 M. The deposition temperature was adjusted at 350 °C and all samples were annealed at 500 °C for 1 h in air. The thickness of TiO2 films was changed in the range of 50 to ca. 800 nm by varying the number of spray cycles from 1 to 21 and the solution concentration. The results showed that the mean crystallite size of the anatase structure, the surface roughness, and light absorption increased with the film thickness. The effect of film thickness on the photocatalytic activity was investigated with the photodegradation of stearic acid under UV-A irradiation. The optimal thickness of TiO2 films fabricated by ultrasonic spray pyrolysis for photocatalytic self-cleaning applications was in the range of 170–230 nm, indicating a ca. 2.6 times-higher photocatalytic self-cleaning activity compared to the reference sample, Pilkington ActivTM. The photocatalytic results showed that the 190 nm-thick TiO2 film deposited from the 0.1 M solution applying seven spray cycles exhibited the finest grain structure and maximum photocatalytic activity, leading to 94% of stearic acid degradation in 180 min under UV-A light with the reaction rate constant k = 0.01648 min−1.

Fabrication and Characterization of High-Performance Thin-Film Transistors Based on Epitaxial Ta-Doped TiO2 Films

2019 ◽  
Vol 66 (10) ◽  
pp. 4193-4197
Author(s):  
Wei Zhao ◽  
Yuanjie Lv ◽  
Xianjin Feng ◽  
Linan He ◽  
Hongdi Xiao ◽  
...  
Keyword(s):  
Thin Film ◽  
Thin Film Transistors ◽  
High Performance ◽  
Tio2 Films ◽  
Doped Tio2 ◽  
Fabrication And Characterization

scholarly journals Characterization of photocatalytically active coatings based on TiO2/Zn-Al layered double hydroxide on ceramic tiles

2013 ◽  
pp. 181-190 ◽  
Author(s):  
Tatjana Vulic ◽  
Ognjen Rudic ◽  
Jonjaua Ranogajec
Keyword(s):  
Photocatalytic Activity ◽  
Molecular Mass ◽  
Point Of View ◽  
The Self ◽  
Ceramic Tiles ◽  
Peg 4000 ◽  
Degradation Reaction ◽  
Self Cleaning ◽  
Double Hydroxide

The self-cleaning function (photocatalytic activity and surface hydrophilicity/hydrophobicity) is of great importance for ceramic tiles from both economic and environmental point of view. This research is focused on the preparation of suitable photocatalytic suspensions studying the influence of the photocatalyst powder amount and the molecular mass of polyethylene glycol (PEG) on the self-cleaning properties of the suspensions deposited on the ceramic tile surface. Photocatalysts based on Zn-Al double layered hydroxides with TiO2 as active component, were synthesized and used for the preparation of the suspensions. The coated tiles prepared using smaller photocatalyst amount and the highest investigated molecular mass of PEG (PEG 4000) showed the highest photocatalytic activity in the Rhodamine B degradation reaction, as well as the appropriate surface properties.

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