Fast Method for Testing the Photocatalytic Performance of Modified Gypsum

Janus, Magdalena; Zając, Kamila; Ehm, Clemens; Stephan, Dietmar

doi:10.3390/catal9080693

Cited by 8 publications

(4 citation statements)

References 17 publications

(19 reference statements)

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“…The photocatalytic properties of modified gypsum plasters toward air purification were estimated during NO x degradation. The detailed parameters of the process and the scheme of NO x installation were depicted in our previous works [41,42]. Briefly, in each test, the four gypsum plates were placed in the center of a quartz cylindrical reactor with dimensions of Ø × H = 9 × 32 cm, which was surrounded by four UV lamps (4 × 22 W, Philips) with the cumulative radiation intensity of 100 W/m 2 UV and 4 W/m 2 vis.…”

Section: Determination Of Photocatalytic Activitymentioning

confidence: 99%

Combined Effect of Photocatalyst, Superplasticizer, and Glass Fiber on the Photocatalytic Activity and Technical Parameters of Gypsum

et al. 2020

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In this study, gypsum plasters enriched with the modified photocatalyst TiO2/N and additive components were prepared and analyzed in detail. The aim of this work was to recognize the combined impact of a photocatalyst, polycarboxylic superplasticizer (SP), and glass fiber (F) on the properties of the composed building materials. The mutual compatibility was verified in relation to self-cleaning and air-purifying activity as well as to the technical parameters defined in standards for gypsum materials. The measurements revealed that photocatalytic gypsum material can have high mechanical strength and limited shrinkage as a result of superplasticizer contribution in form of a water-reducing and well-dispersive agent. Normal consistency was achieved by the addition of 0.01 wt % of SP to photocatalytic gypsum mortar or by the addition of 0.2 wt % of SP with a 12% reduction of water. This study also explains why glass fiber fulfills the role of inner reinforcement only if a superplasticizer is simultaneously added to the gypsum matrix. It is possible, by the combined effect of TiO2/N, a polycarboxylic superplasticizer, and glass fiber, to achieve NOx degradation at a high level. Moreover, the significantly improved self-cleaning properties of the complex gypsum plasters surfaces from dye pollutants in comparison to a gypsum plaster with solely a TiO2/N photocatalyst indicate the synergistic effect of the three considered additives.

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Section: Determination Of Photocatalytic Activitymentioning

confidence: 99%

Combined Effect of Photocatalyst, Superplasticizer, and Glass Fiber on the Photocatalytic Activity and Technical Parameters of Gypsum

et al. 2020

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“…The photocatalytic activity of the prepared plates of cement mortar toward the degradation of air pollutions was also proved. In our previous works [31,32], the gaseous NO (1.989 vppm ± 0.040 ppm, Air Liquide) was used as model pollution in photocatalytic tests. NOx removal was evaluated using the experimental installation, whose scheme is presented in Figure 1.…”

Section: Methodsmentioning

confidence: 99%

Photocatalytic Activity and Mechanical Properties of Cements Modified with TiO2/N

et al. 2019

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In this paper, studies of the mechanical properties and photocatalytic activity of new photoactive cement mortars are presented. The new building materials were obtained by the addition of 1, 3, and 5 wt % (based on the cement content) of nitrogen-modified titanium dioxide (TiO2/N) to the cement matrix. Photocatalytic active cement mortars were characterized by measuring the flexural and the compressive strength, the hydration heat, the zeta potential of the fresh state, and the initial and final setting time. Their photocatalytic activity was tested during NOx decomposition. The studies showed that TiO2/N gives the photoactivity of cement mortars during air purification with an additional positive effect on the mechanical properties of the hardened mortars. The addition of TiO2/N into the cement shortened the initial and final setting time, which was distinctly observed using 5 wt % of the photocatalyst in the cement matrix.

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“…In our previous work [26,27], the NO gas (1.989 ppm ± 0.040 ppm, Air Liquid) was used as model pollution in photocatalytic tests. NOx removal was evaluated using the experimental installation (Figure 1).…”

Section: Nox Decompositionmentioning

confidence: 99%

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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Fast Method for Testing the Photocatalytic Performance of Modified Gypsum

Cited by 8 publications

References 17 publications

Combined Effect of Photocatalyst, Superplasticizer, and Glass Fiber on the Photocatalytic Activity and Technical Parameters of Gypsum

Combined Effect of Photocatalyst, Superplasticizer, and Glass Fiber on the Photocatalytic Activity and Technical Parameters of Gypsum

Photocatalytic Activity and Mechanical Properties of Cements Modified with TiO2/N

A New Preparation Method of Cement with Photocatalytic Activity

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