Adsorption of diethyl phthalate (DEP) on activated carbon (AC) from green coconut shell: physical-chemical characterization and influence of operational parameters

Authors

DOI:

https://doi.org/10.33448/rsd-v10i14.21966

Keywords:

Effluent; Diethyl phthalate; Activated carbon; Catalyst; Adsorption capacity.

Abstract

The physicochemical characterization of AC in the elimination of DEP in synthetic effluent was studied. Through the adsorption kinetics and isotherms, according to the factorial design of 11 tests and mathematical models, the influence of temperature, pH, and CA mass was verified. AC presented low surface area (554.228 m2 g-1), microporous area (460.0539 m2 g-1) and high microporous volume (0.253081 cm3 g-1) by the BET and BJH method, and due to activation, high basicity, pHPZC (7.2). Elemental and surface group analysis by the Boehm method revealed a predominance of basic groups (0.845 meq g-1), lactones (0.211 meq g-1) and phenols (0.169 meq g-1), confirmed by infrared spectroscopy (FTIR ) by the presence of quinone, lactone and carbonyl groups. The adsorption treatment presented higher coefficients of determination (R2 > 0.90) in the study of kinetics for the pseudo-second order model, and of isotherms for the Freundlinch model. AC presented an 83.5% DEP elimination rate, a DEP adsorption capacity of 27.006 mg g-1 at pH 7, with 0.4 g of AC at 30ºC in 360 minutes, however, it reduced by 13% its rate and 20.598 mg g-1 of adsorption capacity at pH 11, with 0.2 g of AC at 15ºC in 360 minutes. For the adsorption capacity and DEP elimination rate there was no significant difference in treatments with (p < 0.5). In the Thermogravimetric Analysis (TGA), the decomposition close to 600ºC, and by Scanning Electron Microscopy (SEM), the textural properties were maintained.

Author Biographies

Maria Carolina de Almeida, Instituto Federal de Educação, Ciência e Tecnologia de Goiás

Mestra em Ciência e Tecnologia de Alimentos pela Universidade Federal de Goiás, possui graduação em Engenharia de Alimentos pela Universidade Federal de Goiás (2004), pós-graduação MBA em Gestão da Qualidade pela Universidade do Grande Rio (2007) e pós-graduação em Engenharia de Segurança do Trabalho pela Universidade de Rio Verde (2014). Atualmente é Técnica de Laboratório/ Alimentos no Instituto Federal de Educação, Ciência e Tecnologia Goiás - Campus Inhumas. Tem experiência na área de Ciência e Tecnologia de Alimentos, com ênfase em Engenharia de Alimentos.

Fernando Pereira de Sá, Instituto Federal de Educação, Ciência e Tecnologia de Goiás

Possui graduação em Física pelo Instituto de Física - UFG, mestrado em Física pelo Instituto de Física - UFG e doutorado em Química pelo Instituto de Química - UFG. Atualmente é Professor Efetivo do Instituto Federal de Educação, Ciência e Tecnologia de Goiás (IFG) - Câmpus Inhumas, atuando nas áreas de Física e Química. Tem experiência na área de Física, com ênfase em Estrutura de Líquidos e Sólidos - Cristalografia. Atuando também nas áreas de Química de Materiais e Ambiental, no desenvolvimento de novos materiais para aplicações em tratamento de recursos hídricos.

Juilão Pereira, Universidade Federal de Goiás

Bacharel em Química pela Universidade Nacional de Timor-Lorosae - UNTL - República Democrática de Timor-Leste em 2005, possui mestrado e doutorado em química no programa de pós-graduação de Instituto de Química pela Universidade Federal de Goiás - UFG. Atualmente está atuando como pesquisador, sendo Gerente de Pesquisa junto ao LAMES (Laboratório de Métodos de Extração e Separação) da UFG, sendo responsável pela organização do laboratório, operar e dar treinamentos para os alunos de iniciação científica, mestrandos e doutorando de todos os equipamentos analíticos (tais como GC-FID/ECD/NPD/Massas, HPLC-UV-vis/DAD, ICP-OES, técnicas termogravimétricas (TG e DSC), infravermelho, UV-vis e entre outros). Atuando também na parte da extensão do laboratório como apoio técnico junto com o Programa de Monitoramento da Qualidade de Combustível - PMQC da ANP (Agência Nacional do Petróleo, Gás Natural.

Tatianne Ferreira de Oliveira, Universidade Federal de Goiás

Engenheira de Alimentos pela Universidade Federal de Goiás (2004), Mestrado pelo Institut National Agronomique de Paris (INAPG) (2006), doutorado pela Université d’Orléans (2011), Pós doutorado pela Universidade Federal de Goiás (UFG), com bolsa Jovens Talentos (BJT) do CNPQ. Possui artigos completos publicados em periódicos, além de publicações em congressos nacionais e internacionais. Tem experiência com ensino superior desde 2009. Desde 2013 é professor efetivo com dedicação exclusiva na Escola de Agronomia / UFG em Goiânia - Brasil, ministrando aulas na graduação e Pós-Graduação. Atualmente é vice-coordenadora do Programa de Pós-gradução em Ciência e Tecnologia de Alimentos (PPGCTA) e possui pesquisas e orientados de graduação e pós-graduação na área de tratamento de resíduos agroindustriais e aproveitamento de resíduos da agroindústria.

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02/11/2021

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ALMEIDA, M. C. de .; SÁ, F. P. de .; PEREIRA, J.; OLIVEIRA, T. F. de . Adsorption of diethyl phthalate (DEP) on activated carbon (AC) from green coconut shell: physical-chemical characterization and influence of operational parameters. Research, Society and Development, [S. l.], v. 10, n. 14, p. e289101421966, 2021. DOI: 10.33448/rsd-v10i14.21966. Disponível em: https://rsdjournal.org/index.php/rsd/article/view/21966. Acesso em: 24 apr. 2024.

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Vol. 10 No. 14

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Exact and Earth Sciences

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