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Texto completo
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| Autor(es): |
dos Santos, Joao Vitor
[1, 2]
;
Fregolente, Lais Gomes
[1, 3]
;
Moreira, Altair Benedito
[1]
;
Ferreira, Odair Pastor
[3]
;
Mounier, Stephane
[2]
;
Viguier, Bruno
[2]
;
Hajjoul, Houssam
[2]
;
Bisinoti, Marcia Cristina
[1]
Número total de Autores: 8
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| Afiliação do(s) autor(es): | [1] Univ Estadual Paulista, Lab Estudos Ciencias Ambientais, Dept Quim & Ciencias Ambientais, Inst Biociencias Letras & Ciencias Exatas, Rua Cristovao Colombo 2265, BR-15054000 Sao Jose Do Rio Preto, SP - Brazil
[2] Univ Toulon & Var, Lab MIO Equipe CEM, CS 60584, F-83041 Toulon 9 - France
[3] Univ Fed Ceara, Lab Mat Funcionais Avancados LaMFA, Dept Fis, BR-60455900 Fortaleza, Ceara - Brazil
Número total de Afiliações: 3
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| Tipo de documento: |
Artigo Científico
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| Fonte: |
Science of The Total Environment;
v. 722,
JUN 20 2020.
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| Citações Web of Science: |
1
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| Resumo |
Humic acids (HA) play an important role in the distribution, toxicity, and bioavailability of metals in the environment. Humic-like acids (HLA) that simulate geochemical processes can be prepared by NaOH aqueous extraction from hydrochars produced by hydrothermal carbonization (HTC). HLA can exhibit properties such as those found in HA from soils, which are known for their ability to interact with inorganic and organic compounds. The molecular characteristics of HLA and HA help to explain the relationship between their molecular features and their interaction with metallic species. The aim of this study is to assess the molecular features of HA extracted from Terra Mulata (TM) and HLA from hydrochars as well as their interaction with metals by using Cu(II) ions as a model. The results from C-13 NMR, elemental analysis, FTIR, and UV-Vis showed that HA are composed mostly of aromatic structures and oxygenated functional groups, whereas HLA showed a mutual contribution of aromatic and aliphatic structures as main constituents. The interactions of HA and HLA with Cu(II) ions were evaluated through fluorescence quenching, in which the density of complexing sites per gram of carbon for interaction was higher for HLA than for HA. Furthermore, the HLA showed similar values for stability constants, and higher than those found for other types of HA in the literature. In addition, the average lifetime in both humic extracts appeared to be independent of the copper addition, indicating that the main mechanism of interaction was static quenching with a non-fluorescent ground-state complex formation. Therefore, the HLA showed the ability to interact with Cu(II) ions, which suggests that their application can provide a new approach for remediation of contaminated areas. (C) 2020 Elsevier B.V. All rights reserved. (AU) |
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| Processo FAPESP: |
17/05408-9 - Caracterização das substâncias húmicas extraídas de hidrochar e solos terra mulata da região amazônica
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| Beneficiário: | João Vitor dos Santos |
| Linha de fomento: |
Bolsas no Brasil - Iniciação Científica
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| Processo FAPESP: |
15/22954-1 - Transporte de metais e caracterização da matéria orgânica natural de rios da região de Itacoatiara, Amazônia
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| Beneficiário: | Márcia Cristina Bisinoti |
| Linha de fomento: |
Auxílio à Pesquisa - Regular
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| Processo FAPESP: |
18/09914-9 - Ácidos húmicos e fúlvicos extraídos de carvão hidrotérmico e de solos antropogênicos: estudo da capacidade de complexação e caracterização utilizando técnicas de fluorescência molecular
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| Beneficiário: | João Vitor dos Santos |
| Linha de fomento: |
Bolsas no Exterior - Estágio de Pesquisa - Iniciação Científica
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| Processo FAPESP: |
17/13230-5 - Reforma parcial do etanol: estabilidade e seletividade de óxidos mistos anfóteros como catalisadores para reação em fluxo a baixa atmosférica
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| Beneficiário: | Mauricio Boscolo |
| Linha de fomento: |
Auxílio à Pesquisa - Programa BIOEN - Regular
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| Processo FAPESP: |
18/15733-7 - Avaliação do emprego de carvão hidrotérmico para fins agrícola e de carvão magnético como material adsorvente
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| Beneficiário: | Márcia Cristina Bisinoti |
| Linha de fomento: |
Auxílio à Pesquisa - Programa BIOEN - Regular
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| Processo FAPESP: |
17/26718-6 - Substâncias húmicas de carvão hidrotérmico e de solos Terras Pretas de Índio da Amazônia: Interações com macro e micronutrientes
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| Beneficiário: | Altair Benedito Moreira |
| Linha de fomento: |
Auxílio à Pesquisa - Regular
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