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      Utilização de carvão ativado de dendê in natura e funcionalizado em meio ácido na adsorção de paracetamol Translated title: Application of activated carbon dendê in nature and functionalized on amid acid in paracetamol adsorption

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          Abstract

          RESUMO Uma possível solução para remoção dos fármacos nos corpos hídricos é por meio da adsorção com carvão ativado. O objetivo do trabalho foi estudar a utilização de carvão de dendê in natura e funcionalizado com ácido nítrico (HNO3) na adsorção do paracetamol. As amostras foram caracterizadas quanto às propriedades texturais e químicas. Ensaios cinéticos e de equilíbrio foram realizados com ambas as amostras nos valores de pH: 2,0, pHPCZ e 11,0 a 25 °C. Um bloqueio dos microporos parece ter ocorrido no carvão ativado funcionalizado por grupos funcionais de óxido introduzidos pelo tratamento químico, acarretando na diminuição da eficiência de remoção do paracetamol. No método de Boehm observou-se aumento de grupos ácidos e diminuição nos valores do pHPCZ. O modelo cinético de pseudo-segunda ordem e o modelo de equilíbrio de Langmuir e Sips se ajustaram melhor aos dados experimentais. Maior quantidade adsorvida do paracetamol foi verificada nos ensaios com pH 2,0 e pHPCZ para os carvões quando comparado aos ensaios com pH 11,0, devido à repulsão eletrostática.

          Translated abstract

          ABSTRACT A possible solution for the removal of pharmaceuticals in water bodies is by means of adsorption with activated carbon. The objective of this work was to study the utilization of dendê carbon in nature and functionalized with nitric acid (HNO3) in the paracetamol adsorption. The samples were characterized as the textural and chemical properties. Kinetic and equilibrium assays were performed with both samples at pH values: 2.0, pHPZC, 11.0 at 25 °C. Micropore blocking seemed to take place in the functionalized activated carbon by oxide groups introduced by the chemical treatment, thus causing decrease in the removal efficiency of paracetamol. In the Boehm method was observed an increase in the acid groups and a decrease in the pHPZC values. The kinetic model of pseudo-second order and the equilibrium Langmuir and Sips model were best fitted to the experimental data. Greatest amount of paracetamol adsorbed was noted in the assays with pH 2.0 and pHPZC to the carbons when compared to the assays with pH 11.0, due to electrostatic repulsion.

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          Physisorption of gases, with special reference to the evaluation of surface area and pore size distribution (IUPAC Technical Report)

          Gas adsorption is an important tool for the characterisation of porous solids and fine powders. Major advances in recent years have made it necessary to update the 1985 IUPAC manual on Reporting Physisorption Data for Gas/Solid Systems. The aims of the present document are to clarify and standardise the presentation, nomenclature and methodology associated with the application of physisorption for surface area assessment and pore size analysis and to draw attention to remaining problems in the interpretation of physisorption data.
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            Pseudo-second order model for sorption processes

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              On the Structure of a Catalyst Surface

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                Author and article information

                Journal
                rmat
                Matéria (Rio de Janeiro)
                Matéria (Rio J.)
                Laboratório de Hidrogênio, Coppe - Universidade Federal do Rio de Janeiro; em cooperação com a Associação Brasileira do Hidrogênio, ABH2 (Rio de Janeiro, RJ, Brazil )
                1517-7076
                2018
                : 23
                : 1
                : e-11968
                Affiliations
                [2] Maringá Paraná orgnameUniversidade Estadual de Maringá orgdiv1Departamento de Química - DQI Brazil
                [1] Maringá Paraná orgnameUniversidade Estadual de Maringá orgdiv1Departamento de Engenharia Química - DEQ Brazil
                [3] Curitiba Paraná orgnameUniversidade Tecnológica Federal do Paraná orgdiv1Departamento Acadêmico de Construção Civil - DACOC Brazil regiane.cristina.1989@ 123456gmail.com
                Article
                S1517-70762018000100423 S1517-7076(18)02300100423
                10.1590/s1517-707620170001.0304
                d7960255-4b06-400a-ad7c-25d9725ec489

                This work is licensed under a Creative Commons Attribution 4.0 International License.

                History
                : 14 December 2016
                : 25 July 2017
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 24, Pages: 0
                Product

                SciELO Brazil

                Categories
                Artigos

                fármaco,Brazilian carbon,pharmaceutical,tratamento químico,carvão nacional,chemical treatment

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