Algal growth inhibition on cement mortar: Efficiency of water repellent and photocatalytic treatments under UV/VIS illumination

Martinez, Thomas; Bertron, Alexandra; Escadeillas, Gilles; Ringot, Erick

doi:10.1016/j.ibiod.2014.01.018

Cited by 51 publications

(32 citation statements)

References 38 publications

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“…The results obtained in air purification point out the interest of testing these transparent coatings for the photocatalytic disinfection of microorganisms. However, the coatings were found to be inefficient against green algae colonization in accelerated tests [47]. Regarding TiO 2 nanoparticles alone, very good antibacterial performance is sometimes reported for photocatalytic TiO 2 , but may be related to very specific experimental conditions that are not representative of the natural conditions to be considered for passive devices.…”

Section: Introductionmentioning

confidence: 99%

Antibacterial Activity of TiO2 Photocatalyst Alone or in Coatings on E. coli: The Influence of Methodological Aspects

et al. 2014

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Abstract:In damp environments, indoor building materials are among the main proliferation substrates for microorganisms. Photocatalytic coatings, including nanoparticles of TiO 2 , could be a way to prevent microbial proliferation or, at least, to significantly reduce the amount of microorganisms that grow on indoor building materials. Previous works involving TiO 2 have already shown the inactivation of bacteria by the photocatalysis process. This paper studies the inactivation of Escherichia coli bacteria by photocatalysis involving TiO 2 nanoparticles alone or in transparent coatings (varnishes) and investigates different parameters that significantly influence the antibacterial activity. The antibacterial activity of TiO 2 was evaluated through two types of experiments under UV irradiation: (I) in slurry with physiological water (stirred suspension); and (II) in a drop deposited on a glass plate. The results confirmed the difference in antibacterial activity between simple drop-deposited inoculum and inoculum spread under a plastic film, which increased the probability of contact between TiO 2 and bacteria (forced contact). In addition, the major effect of the nature of the suspension on the photocatalytic disinfection ability was highlighted. Experiments were also carried out at the surface of transparent coatings formulated using nanoparticles of TiO 2 . The results showed significant antibacterial activities after 2 h and 4 h and suggested that improving the formulation would increase efficiency. OPEN ACCESSCoatings 2014, 4 671

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Section: Introductionmentioning

confidence: 99%

Antibacterial Activity of TiO2 Photocatalyst Alone or in Coatings on E. coli: The Influence of Methodological Aspects

et al. 2014

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“…The nucleation corresponds to the appearance of very small grains called nuclei and growth, and represents the increase in the size of nuclei during the time t. The first algal grains which were visible on the surface of the tank were detected after latency period lasted 30 days. A similar latency period was presented for mortar algae and lasted between 50 and 100 days (Martinez et al, 2014). Initially algal grains were very small and randomly distributed on the surface of the tank; however, after latency period exponential rapid growth was observed.…”

Section: Discussionmentioning

confidence: 53%

Using Avrami equation in the studies on changes in granulometric composition of algal suspension

Kuśnierz

Łomotowski

2015

Hydrobiologia

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In recent years, it has been recognized that the laser diffraction gives valuable information on particle size distribution for all types of dry inorganic or even organic materials. With use of the laser diffraction and the laser granulometer, this paper presents the changes occurring in the granulometric distribution of algal agglomerates and the changes in values of percentiles 10, 50 and 90%, determined basing on volume distribution. While assessing the granulometric composition, the existence of a proportional relationship between the diameter values corresponding to the percentile of 10, 50 and 90% was observed. What is more, the obtained results give insight into the possibility of application of the general Avrami equation to describe the granulometric composition of the algal suspension through the analogy of crystals formation from saturated solutions. The analysis shows that the model described by the modified Avrami equation adequately matched the regression to the experimental data on the granulometric composition of algal suspensions. The values of the correlation coefficients were close to 1, which proves that the regression model explained nearly all cases by the dependent variable V i = F(d i ).

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“…The biological stains lead to significant cleaning costs and to image prejudice in the case of prestigious buildings. Although the microorganisms responsible for these alterations have been quite well identified [32,[38][39][40][41], research is now focusing on determining colonization mechanisms, notably the influential material-related factors [3,35,36,42], and on developing preventive or curative solutions to protect external walls [43][44][45][46][47]. However, some research works seek to improve the bio-receptivity of materials in order to favor the growth of microorganisms such as algae or lichens and higher plants that can improve the appearance and the thermal performance of buildings [48].…”

Section: Microbial Stains On Building Materialsmentioning

confidence: 99%

Understanding interactions between cementitious materials and microorganisms: a key to sustainable and safe concrete structures in various contexts

Bertron

2014

Mater Struct

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Building materials can be exposed to microorganisms (mainly bacteria, fungi and algae) in almost every aqueous medium or damp environment, water being the indispensable condition for life development. The activity of microorganisms can be responsible for mineralogical, chemical and microstructural damage to the material (biodeterioration). Deleterious effects can also concern the aesthetics of a building (proliferation of colored biological stains on façades and roofs) or the quality of indoor air (presence of microorganisms in damp buildings). However, microorganisms can also have positive effects (healing of materials) and their action is explored through the development of bio-based protective systems intended for building materials. In all cases, understanding interactions between building materials and microorganisms is an indispensable step toward the development of more sustainable, better quality, safer structures in many environments. This paper presents two examples where the action of microorganisms has-or is likely to have-strong impact on the durability and safety of concrete structures. The first example concerns the biodeterioration of concrete in agricultural and agro-food environments. The second example is that of the abiotic and biotic reactivity of nitrates in repository of intermediate-level long-lived nuclear wastes. The paper presents the approaches used to explore and understand the phenomenology of biogeo-chemical interactions in these complex environments. These studies notably comprise the development of test methods and experimental pilots to enable these explorations to be carried out. Current shortcomings in the scientific literature and in the standardization environment are also highlighted.

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Algal growth inhibition on cement mortar: Efficiency of water repellent and photocatalytic treatments under UV/VIS illumination

Cited by 51 publications

References 38 publications

Antibacterial Activity of TiO2 Photocatalyst Alone or in Coatings on E. coli: The Influence of Methodological Aspects

Antibacterial Activity of TiO2 Photocatalyst Alone or in Coatings on E. coli: The Influence of Methodological Aspects

Using Avrami equation in the studies on changes in granulometric composition of algal suspension

Understanding interactions between cementitious materials and microorganisms: a key to sustainable and safe concrete structures in various contexts

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