Improvement of the depolluting and self-cleaning abilities of air lime mortars with dispersing admixtures

González-Sánchez, J.F.; Taşcı, Burcu; Fernández, José María Fernández; Navarro-Blasco, Í.; Álvarez, J.I.

doi:10.1016/j.jclepro.2021.126069

Cited by 13 publications

(3 citation statements)

References 110 publications

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“…Pathak and Vesmawala [35] obtained better dispersion of nano-TiO 2 using polycarboxylate as a chemical dispersing agent. González-Sánchez et al [36] also verified increased self-cleaning ability and NO degradation by adding superplasticizers to air lime mortars. Therefore, several methods to avoid agglomeration of TiO 2 nanoparticles are presented in the literature; however, the proper dispersion of the photocatalyst is still a challenge to solve in seeking its best performance [37].…”

Section: Introductionmentioning

confidence: 91%

Assessment of Photocatalytic Nano-TiO2 Mortars’ Behavior When Exposed to Simulated Indoor Conditions of Glazed Buildings

Casarin,

Bersch,

Maia

et al. 2023

Buildings

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The application of nano-TiO2 as a photocatalytic agent in buildings’ internal surfaces has recently attracted attention to mitigate microorganism growth, soiling, and contamination in indoor environments. This work aimed at comparing the Rhodamine B (RhB) dye degradation efficiency of three different mortar compositions subjected to simulated internal radiation, in which nano-TiO2 (10 wt% of binder mass) was dispersed by ultrasonic and mechanical methods. Mortar specimens were produced with white Portland cement, hydrated lime, sand, and water in different volume proportions of 1:1:6 (cement:lime:sand), 1:3 (cement:sand), and 1:4 (cement:sand). The first stage of the research evaluated samples exposed to the natural outdoor environment and proved the efficiency of specimens’ photoactivity when covered by a glass layer. The second and principal phase of the study simulated indoor conditions in glazed buildings through artificial weathering in which the composition of 1:1:6 was mechanically dispersed and exhibited the highest global color change (ΔE) values for RhB staining. The main finding of the study was that the mortars exposed to simulated indoor conditions presented high ΔE grades, classified as easily perceived by the human eye. This demonstrates the photocatalytic efficiency in an internal building environment that receives radiation through a glass surface.

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Section: Introductionmentioning

confidence: 91%

Assessment of Photocatalytic Nano-TiO2 Mortars’ Behavior When Exposed to Simulated Indoor Conditions of Glazed Buildings

Casarin,

Bersch,

Maia

et al. 2023

Buildings

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“…It should be noted that, the electronpositive hole coupling due to the proximity between active sites generates loss of the efficiency of the photocatalytic action, and, accordingly, a low depolluting effectiveness and antimicrobial activity. This vicinity may be a direct consequence of the type and quantity of nano-sized particles, which show a sharp trend to agglomerate reducing the catalyst area, although at the same time they provide a greater number of active sites [45,47]. Therefore, methods to optimize the dosage of nanoparticles and to fully exploit the performance of nanomaterials in cementitious composites are still being studied [43,48].…”

Section: Preparation Of Alkali-activated Materialsmentioning

confidence: 99%

“…Likewise, studies of the zeta potential show that nano-TiO 2 requires longer times for the electrostatic stabilization of the particles [47]; therefore, its catalytic effect is poorer and delayed. Thus, it could be expected that the ZnO particles require less time for their electrostatic stabilization, therefore explaining their effective dispersion in the developed material.…”

Section: Biological Activity With Bacteriamentioning

confidence: 99%

Novel Alkali-Activated Materials with Photocatalytic and Bactericidal Properties Based on Ceramic Tile Waste

2021

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Ceramics tile wastes (CWs) were mechanically conditioned for the preparation of alkali-activated hybrid-cements from CW (90 wt.%) and Portland cement (10 wt.%) mixtures using sodium silicate (SS) + NaOH as alkaline activators. Molar ratios of SiO2/Al2O3 (6.3 to 7.7) and Na2O/SiO2 (0.07 to 0.16) were used. The cements were prepared at room temperature (25 °C) and characterized by mechanical and physical properties and microstructure. The optimized cement was used for the preparation of novel photoactivated composite materials by incorporating 5 and 10 wt.% TiO2 (Ti) and ZnO (Z) nanoparticles, and its self-cleaning and bactericidal properties were evaluated by means of the degradation of rhodamine-B (Rh-B) and the growth inhibition of Klebsiella pneumoniae and Pseudomonas aeruginosa bacteria. The results of this study showed that the 100SS-5Z and 50SS:50G-10Ti cements have an effective photocatalytic activity for Rh-B degradation of 98.4% and 76.4%, respectively, after 24 h. Additionally, the 100SS-5Z and 50SS:50G-10Ti cement pastes and their respective mortars were effective in inhibiting the growth of Pseudomonas Aeruginosa and Klebsiella pneumoniae bacterial strains, evidenced by the formation of bacterial inhibition halos around the sample discs. Finally, these results are novel, and open the possibility of using constructions and demolition tile waste in high proportions for the elaboration of new rendering mortar with innovative properties.

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An Assessment of Mechanical Properties on Self-Cleaning Concrete Incorporating Rutile Titanium Dioxide

Sani

Muftah

Ahmad

2022

Advanced Structured Materials

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Improvement of the depolluting and self-cleaning abilities of air lime mortars with dispersing admixtures

Cited by 13 publications

References 110 publications

Assessment of Photocatalytic Nano-TiO2 Mortars’ Behavior When Exposed to Simulated Indoor Conditions of Glazed Buildings

Assessment of Photocatalytic Nano-TiO2 Mortars’ Behavior When Exposed to Simulated Indoor Conditions of Glazed Buildings

Novel Alkali-Activated Materials with Photocatalytic and Bactericidal Properties Based on Ceramic Tile Waste

An Assessment of Mechanical Properties on Self-Cleaning Concrete Incorporating Rutile Titanium Dioxide

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