Bio particles effect of silica from rice husk in the Pinus elliottii wood treatment
Name: MARCOS ALVES NICACIO
Publication date: 31/07/2017
Advisor:
Name |
Role |
|---|---|
| JUAREZ BENIGNO PAES | Advisor * |
Examining board:
| Name |
Role |
|---|---|
| JUAREZ BENIGNO PAES | Advisor * |
Summary: Renewable products can ensure environmental sustainability, human health, and reduce the use of traditional products that have toxic compounds in their formulation. This research aimed to evaluate the biological resistance of the Pinus elliottii wood against fungi and termites xylophagous through impregnation with bio particles of silica (SiO2) obtained from rice husk. In order to obtain the silica, the material has undergone chemical treatment, two cycles of acid leaching in hydrochloric acid, and heat treatment of 500, 550 or 600 °C. The purity of the silica obtained was characterized by X-Ray fluorescence and the average size of particles by scanning electron microscopy - SEM. The SiO2 has been applied in wood at concentrations of 0.5, 1.0 and 2.0% and the impregnated test samples were submitted to essay with brown rot fungi (Gloeophyllum trabeum, Neolentinus lepideus and Postia placenta), soft rot fungi and xylophagous termites (Nasutitermes corniger and Cryptotermes brevis). The heat treatments promoted the attainment of high purity bio particles, with average value of approximately 90% and an average diameter of 263.7 nm. For termite assays, the smallest mass losses and waste have been obtained for the impregnated samples. The termites mortality has increased with the increase of the concentration of the solutions. The SiO2 did not present efficiency against xylophagous fungi, with no difference between the treatments and the control, indicating that resistance observed was inherent to the wood.
Keywords: Wood durability, alternative product, bio silica.
