Preparation of iron oxide compositions and activated charcoal of the cashew (Mesocarpo) of the castanha-do-brasil for removal of blue methylene cork in aquatic medium

Submitted by Rosangela Duarte (vianaa.rosa@gmail.com) on 2019-07-11T16:10:46Z No. of bitstreams: 3 Disserta????o_Rosangela V. L. Duarte..pdf: 2789957 bytes, checksum: 760a85dc97fbed706beb06b18e658078 (MD5) Carta.PNG: 849249 bytes, checksum: ab94e035b4f873da58875fe7b9aa1d53 (MD5) Ata de defesa.JPG: 14163009 bytes, checksum: 91436438d42d4228b64cef95ada491de (MD5) Approved for entry into archive by PPGCEM Ci??ncia e Engenharia de Materiais (ppgcem@ufam.edu.br) on 2019-07-11T18:41:48Z (GMT) No. of bitstreams: 3 Disserta????o_Rosangela V. L. Duarte..pdf: 2789957 bytes, checksum: 760a85dc97fbed706beb06b18e658078 (MD5) Carta.PNG: 849249 bytes, checksum: ab94e035b4f873da58875fe7b9aa1d53 (MD5) Ata de defesa.JPG: 14163009 bytes, checksum: 91436438d42d4228b64cef95ada491de (MD5) Approved for entry into archive by Divis??o de Documenta????o/BC Biblioteca Central (ddbc@ufam.edu.br) on 2019-07-12T20:12:18Z (GMT) No. of bitstreams: 3 Disserta????o_Rosangela V. L. Duarte..pdf: 2789957 bytes, checksum: 760a85dc97fbed706beb06b18e658078 (MD5) Carta.PNG: 849249 bytes, checksum: ab94e035b4f873da58875fe7b9aa1d53 (MD5) Ata de defesa.JPG: 14163009 bytes, checksum: 91436438d42d4228b64cef95ada491de (MD5) Made available in DSpace on 2019-07-12T20:12:19Z (GMT). No. of bitstreams: 3 Disserta????o_Rosangela V. L. Duarte..pdf: 2789957 bytes, checksum: 760a85dc97fbed706beb06b18e658078 (MD5) Carta.PNG: 849249 bytes, checksum: ab94e035b4f873da58875fe7b9aa1d53 (MD5) Ata de defesa.JPG: 14163009 bytes, checksum: 91436438d42d4228b64cef95ada491de (MD5) Previous issue date: 2017-04-27 CAPES - Coordena????o de Aperfei??oamento de Pessoal de N??vel Superior In the last years, the activated carbons produced from agro-industrial and/or extractive waste, has been the focus of n??merous researches on the remediation of polluted aquatic environments, because they renewable materials are low economic value and given proper destination for disposal. Activated carbons when combined with metal oxides result in composites that are the most efficient new materials than their precursors. For this purpose, this research was produced composites of activated carbon and synthetic iron oxide at different temperatures and mass proportions. The extractive residue of Brazil nuts, mesocarp of the fruit (hedgehog), was produced in muffle by pyrolysis, impregnated with ZnCl2 at 400 and 500 ??C, respectively. Iron oxide (Fe2O3) was synthesized by thermal decomposition of the ferric nitrate at 400 ??C. The composites, in turn, were prepared in proportions of 2:1, 1:1 and 1:2 of their components and calcined in a muffle furnace at 400 and 500 ??C, respectively. The materials were characterized by TGA, CHNS, DRX, SEM and adsorption/desorption of N2. All composites presented phases of hematite, but CP521 (ratio 2:1 and 500 oC) presented a magnetic characteristic due to the occurrence of magnetite. The ???ASE???_BET values of the composites varied from 274 to 630 m2 g???1 (CP411), and 1236 m2 g???1 for CA25 (method 2 and 500 oC). The kinetic data of adsorption and/or degradation of methylene blue for all materials were best fitting by the kinetic model of pseudo-second order, with R^2>0,971. Materials against methylene blue show more significant behavior for Langmuir isotherm, where the CA25 q_e=181 "mg" "g" ^(-1) (R^2=0,960) and CP 5 11 q_e=127 "mg" "g" ^(-1) (R^2=0,895), respectively. In general, the Brazil nut hedgehog presents itself as a promising material to produce iron oxide-based coals and composites for the mediation of dyes from polluted. Nos ??ltimos anos, os carv??es ativados produzidos de res??duos agroindustriais e/ou do extrativismo tem sido o foco de in??meras pesquisas na remedia????o de ambientes aqu??ticos polu??dos, por serem materiais renov??veis de baixo custo e ser dado destino adequado ao seu descarte. Os carv??es ativados quando combinados com ??xidos met??licos resultam em comp??sitos que s??o considerados novos materiais mais eficientes do que os seus precursores isolados. Com este intuito, nesta pesquisa foram produzidos comp??sitos de carv??o ativado e ??xidos de ferro sint??tico em diferentes temperaturas e propor????es em massas. Do res??duo do extrativismo da castanha-do-Brasil, mesocarpo do fruto (ouri??o), foram produzidos carv??es ativados p??r pir??lise em mufla, impregnados com ZnCl2 a 400 e 500 ??C, respectivamente. O ??xido de ferro (-Fe2O3) foi sintetizado por decomposi????o t??rmica do nitrato f??rrico a 400 ??C. Os comp??sitos, por sua vez, foram preparados nas propor????es de 2:1, 1:1 e 1:2 dos seus componentes e calcinados em forno mufla a 400 e 500 ??C, respectivamente. Os materiais foram caracterizados por TGA, CHNS, DRX, SEM e adsor????o/dessor????o de N2. Todos os comp??sitos apresentaram fase da hematita, mas o CP521 (propor????o 2:1 e 500 oC) apresentou caracter??stica magn??tica devido a ocorr??ncia de magnetita. Os valores de ???ASE???_BET dos comp??sitos variaram de 274 a 630 m2 g???1 (CP411), e 1236 m2 g???1 para CA25 (m??todo 2 e 500 oC). Os dados de cin??tica de adsor????o e/ou degrada????o do azul de metileno para todos os materiais foram melhor ajustados pelo modelo cin??tico de pseudo-segunda ordem, com R^2>0,971. Os materiais frente ao azul de metileno mostram comportamento mais significativo para a isoterma de Langmuir, em que o CA25 teve q_e=181 "mg" "g" ^(-1) (R^2=0,960) e CP511 teve q_e=127 "mg" "g" ^(-1) (R^2=0,895), respectivamente. No geral, o ouri??o da castanha-do-Brasil apresenta-se como um material promissor para produ????o de carv??es ativados e comp??sitos a base de ??xidos de ferro para media????o de corantes de sistemas aquosos polu??dos.