Photoactive glazed polymer-cement composite

Baltes, Liana; Paţachia, Silvia; Țierean, Mircea Horia; Ekincioglu, Ozgur; Özkul, M. Hulusi

doi:10.1016/j.apsusc.2017.09.068

Cited by 12 publications

(16 citation statements)

References 40 publications

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“…The increased incorporation of TiO 2 on the surface coatings might be due to the electrostatic adsorption between the cationic Ni ion and the negatively charged TiO 2 particles. According to the point of zero charge of TiO 2 which is at approximately pH 5.8-6.8 [25], TiO 2 exhibits a positive charge at a pH below 5.8 and a negative charge at a pH above 6.8. Therefore, the incorporation of TiO 2 at a high pH up to pH 9 was probably enhanced because the cationic Ni ions were attracted to the negatively charged TiO 2 nanoparticles [26].…”

Section: Resultsmentioning

confidence: 99%

Preparation of a Floating Photocatalyst via Electroless Ni-P-TiO2 Composite Plating on Polypropylene Balls for Wastewater Treatment

Nijpanich

Kamimoto

Hagio

et al. 2019

J. of Wat. & Envir. Tech.

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Application of photocatalysts is among the most promising methods to eliminate organic pollutants in wastewater. A photocatalytic reaction, which involves the generation of reactive radicals from the reaction on the photocatalyst's surface and their interaction with organic molecules, can degrade organic pollutants. Titanium dioxide (TiO 2 ) is a well-known photocatalyst because it has low toxicity and cost including high chemical stability. However, it cannot be efficiently activated in water because of the difficulty in adsorbing ultraviolet light. In this work, a floating photocatalyst was prepared by combining TiO 2 , Ni-P plating, and a polypropylene (PP) hollow ball substrate. An Ni-P coating was electrolessly deposited on the PP hollow ball in the presence of TiO 2 . The prepared photocatalyst was characterized using X-ray diffraction and scanning electron microscopy-energy-dispersive X-ray spectroscopy. The PP hollow ball substrate was sufficiently covered with the Ni-P coating and Ti was confirmed to be contained in the Ni-P coating. The obtained specimen floated when placed in aqueous solutions and its photocatalytic activity was confirmed through degradation of methylene blue. In addition, the Ni-P plating was found to protect PP from degrading by photocatalytic activity of the TiO 2 .

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Section: Resultsmentioning

confidence: 99%

Preparation of a Floating Photocatalyst via Electroless Ni-P-TiO2 Composite Plating on Polypropylene Balls for Wastewater Treatment

Nijpanich

Kamimoto

Hagio

et al. 2019

J. of Wat. & Envir. Tech.

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“…On the other hand, the effect of TiO 2 addition to cementitious mass leads not only to photocatalytic activity, but also improves the mechanical properties of cementitious materials. The enhancement of mechanical properties by filling the pores and interaction with the other components of cement were observed [6,22,25].…”

Section: Introductionmentioning

confidence: 97%

“…Among various semiconductors, the most widely used photocatalyst is titanium dioxide. Within the numerous advantages of TiO 2 , its catalytic longevity, availability, and easy activation in ambient conditions as well as the compatibility with the conventional building materials should be mentioned [1,6]. The basic principle of the photocatalysis phenomenon is the activation of the photocatalyst particles by appropriate irradiation.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, nanomaterials are often immobilized on an appropriate building substrate. The photocatalytic coating for building materials were obtained by using dip-coating, spin coating, spraying, or brushing [6]. Feng et al [18] prepared the photocatalytic TiO 2 /cement composite by a smear method through the floating emulsion of TiO 2 onto the pre-wet surface of the cement mortar.…”

Section: Introductionmentioning

confidence: 99%

“…They showed that TiO 2 particles were dispersed equally on the surface of the cementitious material and the prepared mortar had a good cyclical photocatalytic performance. Baltes et al [6] showed that the application of the dip-coating technique led to the high photocatalytic activity, but that low mechanical resistant layers were obtained. The methods using TiO 2 surface treatment for the cement-based materials appeared to be problematic due to the weak adhesion between the photocatalytic coating and the building material.…”

Section: Introductionmentioning

confidence: 99%

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A New Preparation Method of Cement with Photocatalytic Activity

et al. 2020

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The studies of some mechanical properties and photocatalytic activity of new cements with photocatalytic activity are presented. The new building materials were obtained by addition of semi-product from titanium white production. Semi-product was calcined at 300 and 600 °C for one, three, and five hours and then this material was added to cement matrix in an amount of 1 and 3 wt.%. New materials were characterized by measuring the flexural and compressive strength and the initial and the final setting time. The photocatalytic activity was tested during NOx photooxidation. The cement with photocatalytic activity was also characterized by sulphur content measurements. The measurement of reflectance percentage of TiO2-loaded cements in comparison with pristine cement and TiO2 photocatalyst calcined at 600 °C were also performed. It should be emphasized that although in some cases, the addition of photocatalyst reduced the flexural and the compressive strength of the modified cements, these values were still within the norm PN-EN 197-1:2012. It was also found that the initial and the final setting time is connected with the crystal size of anatase, and the presence of larger crystals significantly delays of the setting time. This was probably caused by a water adsorption on the surface of anatase crystals.

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