Impregnação de carvão ativado com nanopartículas de cobre por um método de síntese verde utilizando extrato de folhas de moringa oleifera para remoção de nitrato da água

• Ano de defesa: 2016
• Autor(a) principal: Galan, Crislaine Rodrigues
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Estadual de Maringá; Brasil; Departamento de Engenharia Química; Programa de Pós-Graduação em Engenharia Química; UEM; Maringá, PR; Centro de Tecnologia
• Palavras-chave em Português: Desenvolvimento de processos; Preservação e controle ambiental; Carvão ativado; Impregnação de nanopartículas metálicas; Síntese verde; Moringa oleifera; Nanopartículas de cobre; Remoção nitrato; Brasil.; Activated carbon; Copper nanoparticles; Green synthesis; Removal nitrate; Brazil.; Engenharias; Engenharia Química
• Link de acesso: http://repositorio.uem.br:8080/jspui/handle/1/3770

Activated charcoal as well as the metal nanoparticles of copper, have excellent adsorbent properties and can be used as viable alternatives in water treatment. This study aimed to combine the properties of these two materials developing a "green" synthesis process for impregnation of copper nanoparticles (NPsCu) on activated carbon using extracts of Moringa Oleifera leaves as a reducing agent. These new adsorbents were evaluated to remove nitrate from water, which today is is considered one of groundwater contaminants most studied in the world, due to the serious problems that this can cause human health. Aqueous copper sulfate solutions at different concentrations were added to the activated coal together with Moringa oleifera leaves extract. The produced materials were characterized by determining the point of zero charge (pHpcz) and their textural property (BET specific surface area, volume and pore diameter), morphology (Scanning electron microscopy-SEM, Transmission electron microscopy-TEM), structural and compositional (X-ray diffraction-XRD, Energy dispersive X-ray spectroscopy-EDS). The particle size was estimated by Scherrer equation and elemental copper concentrations were estimated by Total reflection X-ray fluorescence (TXRF). Experiments of adsorption and pH studies, kinetics and adsorption isotherms were performed to evaluate the efficiency of removing nitrate from water, and the concentrations were determined by UV spectrophotometry. The stability of NPsCu impregnation on the carbon after adsorption was measured by TXRF analyzes in the impregnated carbons and aqueous solutions. The characterization results confirmed the formation, impregnation and stability of copper nanoparticles on activated carbon, which reached an average size in the range 6-61 nm. The developed method for synthesis and nanoparticles impregnation proved to be simple and eco-friendly. The impregnated carbons removed significantly the nitrate, indicating their potential application in water treatment.