Smart, reusable labels for assessing self-cleaning films

2015 ◽  
Vol 51 (20) ◽  
pp. 4161-4163 ◽  
Author(s):  
A. Mills ◽  
N. Wells
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Colour Change ◽  
Laboratory Work ◽  
Self Cleaning

Novel, reusable photocatalyst activity indicator label undergoes a rapid colour change when placed in contact with a photocatalytic film via the photoreduction of methylene blue contained within the label's adhesive, and is ideal for assessing photocatalytic activity in situ and in laboratory work.

Effect of SnO2 Addition into TiO2 Thin Films on Photocatalytic Activity and Hydrophilic Property

2014 ◽  
Vol 979 ◽  
pp. 90-93 ◽  
Author(s):  
Weerachai Sangchay ◽  
Tanarat Rattanakool
Keyword(s):  
Thin Films ◽  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Uv Irradiation ◽  
Sol Gel ◽  
Dip Coating ◽  
Photocatalytic Activities ◽  
Self Cleaning ◽  
Xrd Techniques ◽  
Dip Coating Technique

The pure TiO2and SnO2-TiO2thin films on glass substrate were fabricated using a sol-gel dip coating technique. The thin films were annealed at the temperature of 700 °C for 2 h with the heating rate of 10 °C/min. The microstructures of the fabricated thin films were characterized by SEM and XRD techniques. The photocatalytic activities of the thin films were also tested by the degradation of methylene blue (MB) solution under UV irradiation. Finally, hydrophilic or self-cleaning properties of thin films were evaluated by measuring the contact angle of water droplet on the thin films with and without UV irradiation. It was found that 1 %mol SnO2-TiO2thin films shows the highest of photocatalytic activity and provide the most self-cleaning properties.

scholarly journals Improved Self-Cleaning Properties of Photocatalytic Gypsum Plaster Enriched with Glass Fiber

Materials ◽  
2019 ◽  
Vol 12 (3) ◽  
pp. 357 ◽  
Author(s):  
Kamila Zając ◽  
Magdalena Janus ◽  
Antoni Morawski
Keyword(s):  
Mechanical Properties ◽  
Methylene Blue ◽  
Titanium Dioxide ◽  
Photocatalytic Activity ◽  
Glass Fiber ◽  
Glass Fibers ◽  
The Self ◽  
Gypsum Plaster ◽  
Self Cleaning ◽  
Reactive Orange

In the study the self-cleaning properties of photoactive gypsum plasters are presented. The modified gypsum plasters were obtained by addition of 1 and 3 wt.% of nitrogen-modified titanium dioxide (TiO2/N) and 0.1, 0.3, and 0.5 wt.% of glass fiber. The self-cleaning ability of the obtained materials was tested during two dyes decomposition: Methylene Blue (MB) and Reactive Orange (RO). It was found that presence of glass fiber increased photocatalytic activity of modified gypsum plasters, which may be due to the fact glass fiber may act as ducts for light and transport it to sites screened by TiO2 or glass fiber can retard charge recombination. Moreover, unexpectedly the addition of glass fiber did not increase the mechanical properties of modified gypsum plasters, which may be because gypsum does not strongly adhere to the surface of glass fibers.

scholarly journals New photocatalytic nano additives based on titanium dioxide and silica for self-cleaning concrete.

2020 ◽  
Vol 11 (3-2020) ◽  
pp. 145-151
Author(s):  
K. A. Pozhivina ◽  
Keyword(s):  
Methylene Blue ◽  
Titanium Dioxide ◽  
Photocatalytic Activity ◽  
Uv Irradiation ◽  
Photocatalytic Performance ◽  
Industrial Wastes ◽  
Developed Surface ◽  
Nano Additives ◽  
Self Cleaning ◽  
Photocatalytic Concrete

In this article powdered composites of titanium dioxide and silica with high-developed surface(183–534 m2 / g), synthesized from industrial wastes, are considered as photocatalytic concrete additives. Their composition was studied, and the photocatalytic performance was evaluated by decomposition of the dye “Methylene blue” under UV-irradiation. The surfactant’s concentration at which the photocatalytic activity reaches its highest values was determined.

scholarly journals Green synthesis of copper nanoparticles using extract of Dicliptera Roxburghiana, their characterization and photocatalytic activity against methylene blue degradation

2020 ◽  
Vol 9 (1) ◽  
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Green Synthesis ◽  
Copper Nanoparticles ◽  
Plant Extract ◽  
Fixed Ratio ◽  
Colour Change ◽  
Synthesis Of Nanoparticles ◽  
Ft Ir ◽  
Uv Visible

In the modern scientific era, nanotechnology isone of the burning field for researchers and scientists because of their applications in a number of areas. The synthesis of nanoparticles (particles having size 1-100 nm) is also the centre of attraction towards researchers due to its unique chemical and physical properties and wide applications. Nanoparticles can be synthesized by physical, chemical and biological processes also known as green synthesis. Among all of the methods of nanoparticles synthesis, green synthesis is non-toxic, economic and eco-friendly and also applicable to in numerous fields such as medicinal chemistry, catalysis etc. In the present study, we investigate the potential of the extract of plant dicliptera roxburghiana towards the synthesis of copper nanoparticles, for which a fixed ratio of plant extract and CuSO4 solution was used. The synthesis of Cu-NPs was initially confirmed by colour change of CuSO4 from blue to brownish green. The synthesized copper nanoparticles were studied and characterized by XRD, FT-IR and UV-Visible spectroscopy and later on subjected towards the photocatalytic degradation of organic dye methylene blue. Surface Plasmon Resonance of Cu-NPs was found to be at 578 nm using UV-Visible analysis and characteristic peak at 517-519 nm of copper nanoparticles were given by FT-IR spectrometer while XRD analysis showed the spherical shape of Cu-NPs having size of 58 nm. The photocatalytic activity of Cu-NPs was also studied in a comparison manner between the Cu-NPs in dried form and Cu-NPs in plant extract solution against methylene blue under sunlight.

Construction of five Zn(ii)/Cd(ii) coordination polymers derived from a new linear carboxylate/pyridyl ligand: design, synthesis, and photocatalytic properties

2016 ◽  
Vol 45 (31) ◽  
pp. 12352-12361 ◽  
Author(s):  
Lei-Lei Liu ◽  
Cai-Xia Yu ◽  
Ji-Min Du ◽  
Shi-Min Liu ◽  
Jing-Shuai Cao ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Coordination Polymers ◽  
Ligand Design ◽  
Photocatalytic Properties ◽  
Design Synthesis ◽  
Transformation Reaction ◽  
Pyridyl Ligand

Reactions of Cd(OAc)2/Zn(OAc)2 with a new linear carboxylate/pyridyl ligand under different templates via an in situ ligand transformation reaction produced five new CPs. Complexes 1–5 exhibited relatively good photocatalytic activity towards the degradation of methylene blue.

Synthesis of Carbon Containing TiO2 Nano Powders by Aerosol Flame Deposition for Photocatalyst

2008 ◽  
Vol 8 (9) ◽  
pp. 4603-4606
Author(s):  
Gyeong-Taek Lim ◽  
Yeon-Hong Kim ◽  
Hyung-Gon Jeong ◽  
Hee-Gweon Woo ◽  
Seung-Ho Ohk ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Visible Light Irradiation ◽  
Decomposition Rate ◽  
Light Irradiation ◽  
Deposition Technique ◽  
Carbon Doped ◽  
Nano Powder ◽  
Excellent Photocatalytic Activity

In-situ carbon-doped-TiO2 nano-powder was prepared by an AFD (aerosol flame deposition) technique using ethanol and isopropanol, and the photocatalytic activity of the prepared powder was examined. There were no significant effect of the solvents on the phase of the prepared TiO2, but the level of carbon in the deposits prepared with ethanol was lower than that prepared with isopropanol. Also, the average sizes of the particles prepared with ethanol were slightly smaller than that formed with isopropanol. All the samples showed excellent photocatalytic activity in the decomposing of methylene blue (MB). We even observed photocatalytic activity of the powder under visible light irradiation, although the decomposition rate of MB under this irradiation was slightly slower than under UV-A light irradiation.

scholarly journals In-Situ Fabrication of g-C3N4/ZnO Nanocomposites for Photocatalytic Degradation of Methylene Blue: Synthesis Procedure Does Matter

Nanomaterials ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 215 ◽  
Author(s):  
Shengqiang Zhang ◽  
Changsheng Su ◽  
Hang Ren ◽  
Mengli Li ◽  
Longfeng Zhu ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Zinc Acetate ◽  
Diffuse Reflectance Spectroscopy ◽  
Low Cost ◽  
Zno Nanorods ◽  
Light Illumination ◽  
Maximum Reaction Rate ◽  
In Situ Fabrication

The nanocomposite preparation procedure plays an important role in achieving a well-established heterostructured junction, and hence, an optimized photocatalytic activity. In this study, a series of g-C3N4/ZnO nanocomposites were prepared through two distinct procedures of a low-cost, environmentally-friendly, in-situ fabrication process, with urea and zinc acetate being the only precursor materials. The physicochemical properties of synthesized g-C3N4/ZnO composites were mainly characterized by XRD, UV–VIS diffuse reflectance spectroscopy (DRS), N2 adsorption-desorption, FTIR, TEM, and SEM. These nanocomposites’ photocatalytic properties were evaluated in methylene blue (MB) dye photodecomposition under UV and sunlight irradiation. Interestingly, compared with ZnO nanorods, g-C3N4/ZnO nanocomposites (x:1, obtained from urea and ZnO nanorods) exhibited weak photocatalytic activity likely due to a “shading effect”, while nanocomposites (x:1 CN, made from g-C3N4 and zinc acetate) showed enhanced photocatalytic activity that can be ascribed to the effective establishment of heterojunctions. A kinetics study showed that a maximum reaction rate constant of 0.1862 min-1 can be achieved under solar light illumination, which is three times higher than that of bare ZnO nanorods. The photocatalytic mechanism was revealed by determining reactive species through adding a series of scavengers. It suggested that reactive ∙O2− and h+ radicals played a major role in promoting dye photodegradation.

scholarly journals Evaluation of photocatalytic activity of titanosilicate powders of synthetic origin

2021 ◽  
Vol 12 (2-2021) ◽  
pp. 273-278
Author(s):  
A. V. Tsyryatieva ◽  
◽  
V. V. Tyukavkina ◽  
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Phase Composition ◽  
Visible Light ◽  
Specific Surface ◽  
The Self ◽  
Cement Stone ◽  
Light Sources ◽  
Self Cleaning ◽  
Imagej Software

In this work, a comparative study of the photocatalytic activity of synthetic titanosilicate powders with differences in phase composition and specific surface area was carried out. Evaluation of the efficiency of decomposition of the dye methylene blue in the presence of titanosilicate additives in an aqueous medium under ultraviolet and visible light sources is given. The self-cleaning ability of titanosilicate-modified cement stone was studied by exposure to ultraviolet and visible light using ImageJ software. The strength of a cement stone modified with a titanosilicate additive has been determined, and its ability to self-cleaning under the influence of ultraviolet and visible light has been studied.

The Preparation of Rutile TiO2 Doped with Rare Earth Metal Ions, Sulfur and Their Photocatalytic Properties

2005 ◽  
Vol 486-487 ◽  
pp. 53-56 ◽  
Author(s):  
Lian Gao ◽  
Hong Yan Liu ◽  
Jing Sun
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
Synergistic Effects ◽  
Particle Surface ◽  
Earth Metal ◽  
Light Irradiation ◽  
Photocatalytic Activities

Small quantities of lanthanum, yttrium and sulfur are doped in rutile n-TiO2 that was synthesized by an in-situ hydrothermal method. Their photocatalytic activities are characterized by the degradation of methylene blue (MB) under UV-Vis and visible light irradiation. The results show that lanthanum and yttrium ions are rich on the particle surface, which not only makes the surface energy decrease but also inhibits the recombination of photoexcited carriers, while S-doping produces states in the band gap of TiO2 that absorb visible light. Compared to the S-doping, La-doping, and Y-doping, respectively, the synergistic effects of (S, La)-codoping and (S, Y)-codoping result in a higher photocatalytic activity under visible light irradiation.

Investigation of Photocatalytic Activity of TiO2-PANi Nanocomposites

2014 ◽  
Vol 699 ◽  
pp. 53-58
Author(s):  
Zatil Amali Che Ramli ◽  
Wan Nor Roslam Wan Isahak ◽  
Mohd Ambar Yarmo ◽  
Nilofar Asim
Keyword(s):  
Aqueous Solution ◽  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Uv Irradiation ◽  
Photo Degradation ◽  
Photocatalytic Activities ◽  
Pani Matrix

In this paper the photocatalytic activity of TiO2-PANi nanocomposites prepared using two differentIn-situpolymerization methods have been investigated. The same pressure, temperature, precursors, mole ratio, and solvent have been employed for preparation of nanocomposites. The synthesized nanocomposites were characterized by FESEM, XRD and FTIR. Results revealed the successful preparation of TiO2- PANI nanocomposites. TiO2-PANi nanocomposite synthesized using method 2 showed very well dispersed TiO2nanoparticles on the surface of PANi. There is no agglomeration of TiO2nanoparticles in PANi matrix. The photocatalytic activities of nanocomposites were evaluated by using photo degradation of Methylene Blue (MB) in aqueous solution under UV irradiation. These nanocomposites exhibit much higher photocatalytic activity compared with TiO2.

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