1. Postgraduate Program in Materials Science and Engineering, Federal University of Rio Grande do Norte, 59078-970 Natal, Rio Grande do Norte, Brazil
2. Environmental Technology Laboratory (LabTam), Federal University of Rio Grande do Norte, 59078-970 Natal, Rio Grande do Norte, Brazil
3. Postgraduate Program in Chemistry, Federal University of Rio Grande do Norte, 59078-970 Natal, Rio Grande do Norte, Brazil
4. Instituto de Carboquimica (CSIC) Miguel Luesma Castan 4, 50018 Zaragoza, Spain
5. Agricultural School of Jundiaí, Federal University of Rio Grande do Norte, 59078-970 Natal, Rio Grande do Norte, Brazil
6. Petroleum Engineering Department, Federal University of Rio Grande do Norte, 59078-970 Natal, Rio Grande do Norte, Brazil