Estudo de metodologias de tratamento do pó da casca do coco para adsorção de Cu+2 e Cd+2

In view of the environmental problem of the pollution of water bodies by heavy metals, caused by human activities in general, and the inadequate destination of certain solid agro-industrial residues, there is a great need to develop research that improves the technique of removing these inorganic...

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Autor principal: Nascimento, Paula Fabiane Pinheiro do
Altres autors: Barros Neto, Eduardo Lins de
Format: doctoralThesis
Idioma:pt_BR
Publicat: Universidade Federal do Rio Grande do Norte
Matèries:
Bioadsorvente
Pó da casca do coco
Monoetanolamina
Octanoato de sódio
Explosão a vapor
Dessorção
Accés en línia:https://repositorio.ufrn.br/jspui/handle/123456789/30109
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id ri-123456789-30109
record_format dspace
institution Repositório Institucional
collection RI - UFRN
language pt_BR
topic Bioadsorvente
Pó da casca do coco
Monoetanolamina
Octanoato de sódio
Explosão a vapor
Dessorção
spellingShingle Bioadsorvente
Pó da casca do coco
Monoetanolamina
Octanoato de sódio
Explosão a vapor
Dessorção
Nascimento, Paula Fabiane Pinheiro do
Estudo de metodologias de tratamento do pó da casca do coco para adsorção de Cu+2 e Cd+2
description In view of the environmental problem of the pollution of water bodies by heavy metals, caused by human activities in general, and the inadequate destination of certain solid agro-industrial residues, there is a great need to develop research that improves the technique of removing these inorganic pollutants from aqueous solutions. One way would be to take advantage of agroindustrial waste as agents that remove these pollutants. As the coconut shell powder (CP) is a residue generated from its processing, the present work aims to provide studies related to three treatment methodologies so that the CP adsorption capacity be empowered and then be reused to remove two toxic metals widely found in wastewater, Cu+ 2 and Cd+ 2 that are widely found in wastewater from effluents from the mining, metallurgy and dye industries. The applied methodologies included the physical and chemical treatment of the PC surface, developed separately, according to the sequence: chemical treatment through the impregnation of Monoethanolamine in the proportion 1: 1, using ethanol as solvent; chemical treatment through the impregnation of the sodium octanoate surfactant by microemulsion; and physical modification using the steam explosion technique (T = 210 °C and P = 5 atm). The efficiency of the proposed treatments was evaluated through characterization analyzes, where changes were observed in the specific contact area, chemical composition and crystallinity of the adsorbent material. The evaluation of the monocomponent adsorption capacity of Cu+2 and Cd+2 ions in the PC was performed using a batch mixing reactor of the synthetic solutions of CuSO4.5H2O and CdSO4.8/3H2O. After chemical treatment, the insertion of functional groups increased the metal - adsorbent interaction confirmed by the values of the kinetic constants of the studied models. It was observed that the coconut shell powder impregnated with OS (PCµE) adsorbed more Cu + 2 ions in relation to the impregnated with MEA (PCA). The treatment with steam explosion, depolymerized the coconut shell powder (PCD), which caused an increase in the total pore volume and crystallinity, consequently, making the adsorbent surface more accessible for adsorption. The behavior of equilibrium isotherms is satisfactorily represented by the Langmuir model and the adsorption capacities (mg / g) of the coconut shell powder after treatments follow the order: PCµE (26.32)> PCD (18.86)> PCA (15.94)> PC (7.88) for Cu+2 and PCD ions (17.90)> PCA (14.02)> PC (4.91) for Cd+2 ions, respectively, emphasizing that the impregnation methodology with surfactants did not significantly improve the interaction of PC with Cd+2. The stability of the impregnation with MEA and OS was evaluated from the desorption study. After the adsorption-desorption cycles, the amount of Cu+2 adsorbed on the PCµE decreased by 36.6%, while for the PCA the reduction was 22.8%. Regarding the adsorption of Cd+2, a reduction of 14% and 10% was observed for PCµE and PCA, respectively. This shows that, after the five adsorption-desorption cycles, the impregnation of monoethanolamine in the coconut shell powder is stronger, remaining with greater removal than the PCµE and thus, it can be reused for more cycles in the adsorption-desorption process.
author2 Barros Neto, Eduardo Lins de
author_facet Barros Neto, Eduardo Lins de
Nascimento, Paula Fabiane Pinheiro do
format doctoralThesis
author Nascimento, Paula Fabiane Pinheiro do
author_sort Nascimento, Paula Fabiane Pinheiro do
title Estudo de metodologias de tratamento do pó da casca do coco para adsorção de Cu+2 e Cd+2
title_short Estudo de metodologias de tratamento do pó da casca do coco para adsorção de Cu+2 e Cd+2
title_full Estudo de metodologias de tratamento do pó da casca do coco para adsorção de Cu+2 e Cd+2
title_fullStr Estudo de metodologias de tratamento do pó da casca do coco para adsorção de Cu+2 e Cd+2
title_full_unstemmed Estudo de metodologias de tratamento do pó da casca do coco para adsorção de Cu+2 e Cd+2
title_sort estudo de metodologias de tratamento do pó da casca do coco para adsorção de cu+2 e cd+2
publisher Universidade Federal do Rio Grande do Norte
publishDate 2020
url https://repositorio.ufrn.br/jspui/handle/123456789/30109
work_keys_str_mv AT nascimentopaulafabianepinheirodo estudodemetodologiasdetratamentodopodacascadococoparaadsorcaodecu2ecd2
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spelling ri-123456789-301092020-09-20T07:50:43Z Estudo de metodologias de tratamento do pó da casca do coco para adsorção de Cu+2 e Cd+2 Nascimento, Paula Fabiane Pinheiro do Barros Neto, Eduardo Lins de Sousa, João Fernandes de Duarte, Lindemberg de Jesus Nogueira Silva, Alfredo José Ferreira da Lopes, Francisco Wendell Bezerra Possa, Rosangela Dala Bioadsorvente Pó da casca do coco Monoetanolamina Octanoato de sódio Explosão a vapor Dessorção In view of the environmental problem of the pollution of water bodies by heavy metals, caused by human activities in general, and the inadequate destination of certain solid agro-industrial residues, there is a great need to develop research that improves the technique of removing these inorganic pollutants from aqueous solutions. One way would be to take advantage of agroindustrial waste as agents that remove these pollutants. As the coconut shell powder (CP) is a residue generated from its processing, the present work aims to provide studies related to three treatment methodologies so that the CP adsorption capacity be empowered and then be reused to remove two toxic metals widely found in wastewater, Cu+ 2 and Cd+ 2 that are widely found in wastewater from effluents from the mining, metallurgy and dye industries. The applied methodologies included the physical and chemical treatment of the PC surface, developed separately, according to the sequence: chemical treatment through the impregnation of Monoethanolamine in the proportion 1: 1, using ethanol as solvent; chemical treatment through the impregnation of the sodium octanoate surfactant by microemulsion; and physical modification using the steam explosion technique (T = 210 °C and P = 5 atm). The efficiency of the proposed treatments was evaluated through characterization analyzes, where changes were observed in the specific contact area, chemical composition and crystallinity of the adsorbent material. The evaluation of the monocomponent adsorption capacity of Cu+2 and Cd+2 ions in the PC was performed using a batch mixing reactor of the synthetic solutions of CuSO4.5H2O and CdSO4.8/3H2O. After chemical treatment, the insertion of functional groups increased the metal - adsorbent interaction confirmed by the values of the kinetic constants of the studied models. It was observed that the coconut shell powder impregnated with OS (PCµE) adsorbed more Cu + 2 ions in relation to the impregnated with MEA (PCA). The treatment with steam explosion, depolymerized the coconut shell powder (PCD), which caused an increase in the total pore volume and crystallinity, consequently, making the adsorbent surface more accessible for adsorption. The behavior of equilibrium isotherms is satisfactorily represented by the Langmuir model and the adsorption capacities (mg / g) of the coconut shell powder after treatments follow the order: PCµE (26.32)> PCD (18.86)> PCA (15.94)> PC (7.88) for Cu+2 and PCD ions (17.90)> PCA (14.02)> PC (4.91) for Cd+2 ions, respectively, emphasizing that the impregnation methodology with surfactants did not significantly improve the interaction of PC with Cd+2. The stability of the impregnation with MEA and OS was evaluated from the desorption study. After the adsorption-desorption cycles, the amount of Cu+2 adsorbed on the PCµE decreased by 36.6%, while for the PCA the reduction was 22.8%. Regarding the adsorption of Cd+2, a reduction of 14% and 10% was observed for PCµE and PCA, respectively. This shows that, after the five adsorption-desorption cycles, the impregnation of monoethanolamine in the coconut shell powder is stronger, remaining with greater removal than the PCµE and thus, it can be reused for more cycles in the adsorption-desorption process. Tendo em vista o problema ambiental da poluição de corpos d'água por metais pesados, causada pelas atividades humanas em geral, e o destino inadequado de certos resíduos agroindustriais sólidos, existe uma grande necessidade de desenvolver pesquisas que melhorem a técnica de remoção desses resíduos poluentes inorgânicos de soluções aquosas. Uma maneira seria aproveitar os resíduos agroindustriais como agentes que removem esses poluentes. Diante disto o presente estudo tem como objetivo avaliar três metodologias de tratamento do pó da casca do coco (PC), a fim de potencializar sua capacidade de adsorção na aplicação da remoção de metais tóxicos do tipo Cu+2 e o Cd+2 muito encontrados em águas residuais de efluentes das indústrias de mineração, metalurgia e corantes. As metodologias aplicadas compreenderam tratamento químico com impregnação de monoetanolamina (MEA), utilizando etanol como solvente, e do tensoativo octanoato de sódio (OS) sob a forma microemulsionada, sobre a superfície do adsorvente e tratamento físico por explosão a vapor (T = 210 °C e P = 5 atm). A eficiência dos tratamentos propostos foi avaliada através das análises de caracterização, onde foram observadas modificações na área especifica de contato, composição química e cristalinidade do material adsorvente. A avaliação da capacidade de adsorção monocomponente dos íons Cu+2 e Cd+2 no PC foi realizada utilizando reator de mistura em batelada das soluções sintética de CuSO4.5H2O e CdSO4.8/3H2O. Após tratamento químico, a inserção de grupos funcionais aumentou a interação metal – adsorvente comprovado pelos valores das constantes cinéticas dos modelos estudados. Foi observado que o pó da casca do coco impregnado com OS (PCµE) adsorveu mais íons de Cu+2 em relação ao impregnado com MEA (PCA). O tratamento com explosão a vapor, despolimerizou o pó da casca do coco (PCD), o que provocou aumento do volume total de poros e cristalinidade, consequentemente, deixou a superfície do adsorvente mais acessível para ocorrer à adsorção. O comportamento das isotermas de equilíbrio é representado satisfatoriamente pelo modelo de Langmuir e as capacidades de adsorção (mg/g) do pó da casca do coco após tratamentos seguem a ordem: PCµE (26,32) > PCD (18,86) > PCA (15,94) > PC (7,88) para os íons Cu+2 e PCD (17,90) > PCA (14,02) > PC (4,91) para os íons Cd+2, respectivamente, ressaltando que a metodologia de impregnação com tensoativos não melhorou significativamente a interação do PC com o Cd+2. A estabilidade da impregnação com MEA e OS foi avaliada a partir do estudo de dessorção. Após os ciclos de adsorção-dessorção, a quantidade de Cu+2 adsorvida no PCµE sofreu uma redução de 36,6 % , enquanto que para o PCA a redução foi de 22,8 %. Em relação à adsorção de Cd+2 foi observada uma redução de 14 % e 10 % para PCµE e PCA, respectivamente. Isso mostra que, após os cinco ciclos de adsorçao-dessorção, a impregnação de monoetanolamina no pó da casca do coco é mais forte, permanecendo com maior remoção que o PCµE e assim, pode ser reutilizado por mais ciclos no processo de adsorção-dessorção. 2020-09-18T22:43:00Z 2020-09-18T22:43:00Z 2020-08-04 doctoralThesis NASCIMENTO, Paula Fabiane Pinheiro do. Estudo de metodologias de tratamento do pó da casca do coco para adsorção de Cu+2 e Cd+2. 2020. 182f. Tese (Doutorado em Engenharia Química) - Centro de Tecnologia, Universidade Federal do Rio Grande do Norte, Natal, 2020. https://repositorio.ufrn.br/jspui/handle/123456789/30109 pt_BR Acesso Aberto application/pdf Universidade Federal do Rio Grande do Norte Brasil UFRN PROGRAMA DE PÓS-GRADUAÇÃO EM ENGENHARIA QUÍMICA

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