Materials Research
URI permanente para esta coleçãohttps://thoth.dti.ufv.br/handle/123456789/13556
Navegar
2 resultados
Resultados da Pesquisa
Item Ecotoxicological Effects of Biochar Obtained from Spent Coffee Grounds(ABM, ABC, ABPol, 2022-11-21) Souza, Lorrana Zélia Martins de; Pinto, Bruna Cristina; Alves, Adriana Barboza; Ribeiro, Amanda Vanessa de Oliveira; Feliciano, Débora Cristina Teodoro; Silva, Luisa Heringer da; Dias, Thiago Tales Moraes; Yılmaz, Murat; Oliveira, Magno André de; Bezerra, Augusto Cesar da Silva; Ferreira, Osania Emerenciano; Lima, Robson Pereira de; Pimenta, Lúcia Pinheiro do Santos; Machado, Alan Rodrigues TeixeiraThe objective of this work is to investigate the conversion of spent coffee grounds (SCG) into biochar (BSC) and the ecotoxicological effects of the product obtained. The SCG and BSC were characterized by characterized by different techniques (TGA/DTG, FTIR, XRD, SEM, EDS, and EDXRF). Proton Nuclear Magnetic Resonance (1H NMR) was used to characterize the aqueous extract of BSC. The inhibitory effect on lettuce (Lactuca sativa) germination was investigated. Besides, antimicrobial activity evaluation trials were conducted with Azospirillum brasilense and Trichoderma spp. The results showed that in the BSC production process, the extractives and lignocellulosic components in the SCG were partly decomposed. Tests conducted with microorganisms did not reveal any toxic effect of BSC. However, high phytotoxicity against lettuce was recorded for rate 100 t/ha of BSC. This effect was associated with the presence of carboxylic acids identified by 1H NMR in the BSC extract aqueous.Item Biodegradation study of a novel poly-caprolactone-coffee husk composite film(ABM, ABC, ABPol, 2016) Borghesi, Daiana Cristina; Molina, Maíra Fernanda; Guerra, Marcos Antônio; Campos, Maria Gabriela NogueiraPlastic disposal is a worldwide issue due to its long degradation time. Environmentally degradable polymers (EDPs) have received considerable attention because of their faster degradation. However, the use of EDPs is limited by high cost and restricted properties. The incorporation of organic fillers is an alternative to reduce cost while increasing biodegradation. Poly-caprolactone (PCL) is a biodegradable polyester compatible with organic fillers. Coffee husk (CH) is a sub-product of coffee processing with potential use as organic filler. We prepared a novel PCL-CH composite film and investigated the effects of CH incorporation on the biodegradation of PCL. Biodegradation study was carried out in soil for 120 days, and evaluated by weight loss measurements. Additionally, soil microbiological and granulometric analyses were performed. Bacteria and fungi were found in the soil that was classified as sandy. The composite film degraded twice faster than PCL film probably due to the adhesion of microorganisms on the coffee husk.