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Anatase as an alternative application for preventing biodeterioration of mortars: evaluation and comparison with other biocides
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Orientador(es)
Resumo(s)
The aim of this study is the comparison between different treatments(anatase and two conventional biocides:Biotin T and Anios)for preventing biodeterioration of mortars.The treatments were applied both in the laboratory on mortar slabs and in situ on walls of Palácio Nacional da Pena(Sintra,Portugal).
Mortar slabs treated with anatase (pure and Fe3þ doped)applied as acoating or by mixing within the mortar were prepared,and their surfaces characterized by different methodologies.The mortars were
inoculated with cyanobacteria and chlorophyta species,incubated for a period of 4 months and the
chlorophyll content quantified by extraction method and fluorescence emission.For comparison purposes untreated mortar slabs were inoculated,incubated and finally treated with the biocides.After two weeks the respective chlorophyll contents was quantified.
In situ studies in two external walls of Palácio Nacional da Pena covered by organisms were also performed by direct application of aqueous solutions of the three products,and the efficiency of the
treatment monitored by spectrophotometry using the CIELAB method.Lichens and other phototrophic microorganisms were identified by direct observation with a microscope and cyanobacteria,green microalgae, bacteria and fungi by DNA-based molecular analysis targeting the 16S and 18S ribosomal RNAgenes.
The results show that anatase is a better agent for preventing biodeterioration than the two tested conventional biocides,both in mortars slabsand in situ studies.In fact,photographic and colorimetric
records made in two external walls of Palácio Nacional da Pena after two weeks of treatments application showed that lichens and other phototrophic microorganisms disappear from the places where anatase
was applied.
Descrição
International Biodeterioration & Biodegradation 64(2010)388 e 396
Palavras-chave
Biodeterioration Mortars Photocatalysis Anatase Biocides
Contexto Educativo
Citação
Editora
Elsevier Ltd.