Acronym NANOGREEN
Category
Marine Biotechnology
Title New generation of sustainable nanotechnology-based additives for marine anti-corrosive coatings: a multidisciplinary approach in the atlantic area Programme National Programme
Instrument (FP6)
Contact Type (FP7)
Strand (Interreg)
NA
Theme (FP7)
Activity Area (FP6)
Regional Area (Interreg)
Action (COST)
NA
Specific Programme (FP7)
NA
Funding source National Coordinator Roberto Carlos Domingues Martins Coordinator email NA
Coordinator institution
UA - University of Aveiro (Portugal)
Institutions involved
NA - SPAROS Lda (Portugal) ,
UNESP - Universidade Estadual Paulista (Brazil) ,
USP - University of São Paulo (Brazil) ,
Start year 2020 End year 2024 Funding (€) € 300,550 Website https://www.cesam-la.pt/projetos/nanogreen-nova-geracao-de-aditivos-sustentaveis-de-base-nanotecnologica-para-revestimentos-anti-corrosivos-maritimos-uma-abordagem-multidisciplinar-no-espaco-atlantico/ Summary Metal corrosion is an economic, technical-scientific and environmental problem that consumes more than 3% of the world's GDP, particularly severe and critical in terms of civil safety in infrastructures immersed in the sea. Current technologies to combat marine corrosion include the application of corrosion inhibitors (ICs; e.g. 2-mercaptobenzothiazole (MBT); zinc phosphate (ZP)) in paints. One of the problems is that most of these ICs are very toxic to aquatic organisms, so recently it has been proposed to replace them with bio-based molecules (e.g., sodium gluconate (SG); glutamic acid (GA), supposedly with less environmental risk. Nevertheless, these "bio-ICs" still require validation in terms of their actual anti-corrosion efficacy on marine-grade steel. More recently, Prof. Dr. Tedim (Co-PI) et al., have developed an innovative technique to immobilize/encapsulate ICs in manufactured nanomaterials (NMs) and thus control their release over time. With this technological development, it was possible to solve the spontaneous and premature leaching that is common in regular coatings, and which reduces their half-life, reduce problems of incompatibilities between ICs and other ingredients of the paints, and mitigate the environmental contamination associated with the release of toxic ICs into the marine environment. Since then, double-layer hydroxides (LDH) and mesoporous silica nanocapsules (SiNC) have been used in the immobilization of commercial ICs (e.g., MBT, ZP) and a "bio-IC" (SG, protected by a patent). Some of the NMs are being validated by the Portuguese company Smallmatek, Lda. to evaluate the possibility of producing them on an industrial scale. Considering the scarcity of studies on the effects of non-conventional NMs on marine organisms and the novelty of UAVR NMs, it was decided to initiate an ecotoxicity study to understand the lethal, physiological and biochemical effects of LDH-MBT, compared to its individual constituents MBT and LDH, on bivalves. Immobilization was found to decrease the acute toxicity of MBT when free in solution, however, the biochemical effects of LDH-MBT were not negligible due to the harmful effect of MBT. This result justifies, per se, the implementation of a strategy to reformulate the design of the NMs and/or the replacement of the IC with another one that is as efficient, but less toxic to be immobilized in the base NMs of low/zero toxicity (LDH) to moderate (SiNC) for marine organisms. But many other questions remained unanswered, and others have arisen in the meantime: What is the behavior, fate and effects of these NMs on the marine ecosystem? Can the encapsulation of "bio-ICs" further decrease the toxicity of this type of additives? If so, why and how? Can the hazardousness of NMs be affected according to the biogeography or biogeochemistry of waters or sediments in different areas of the Atlantic? The NANOGREEN project aims to answer these questions, at least in part, by taking advantage of the multidisciplinary knowledge of the consortium (UAVR-UNESP; USP, SMT) aiming, at the end of the project, to present the world's first nano-additive with high anti-corrosion and environmental performance, ready for further industrial validation. To achieve such a concrete and feasible goal, the NANOGREEN project intends to develop four new NMs with bio-based ICs and compare their properties and anti-corrosion efficiency with four reference NMs (Task 1) and then add them in coatings to evaluate corrosion in immersion scenarios. However, only the most promising nanoadditives will be evaluated in terms of fate, behavior (Task 3) and exposure and hazardousness in the environment of temperate and tropical Atlantic waters (Task 4) and in terms of subcellular effects on marine organisms through a holistic approach to eventual discovery of the mechanisms of action of NMs (Task 5). The presentation and dissemination of the results will be organized in Task 6. The novelty of this proposal lies in the development of the first high-performance anti-corrosive additive with reduced toxicity and environmental risk in different biogeographies, using a comprehensive and multidisciplinary approach. NANOGREEN thus pays attention to the main societal challenges in the Atlantic Area, namely protection of the oceans and their biodiversity, the need for environmental awareness and the promotion of blue growth.
Keywords
Bioprospecting;
Biomaterial;
Technology;
Impacts;
Bioproduct;
Marine Region
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