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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Humic-like acids from hydrochars: Study of the metal complexation properties compared with humic acids from anthropogenic soils using PARAFAC and time-resolved fluorescence

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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]
Total Authors: 8
[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
Total Affiliations: 3
Document type: Journal article
Source: Science of The Total Environment; v. 722, JUN 20 2020.
Web of Science Citations: 1

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)

FAPESP's process: 15/22954-1 - Metal transportation and natural organic matter characterization from rivers of Itacoatiara, Amazônia
Grantee:Márcia Cristina Bisinoti
Support type: Regular Research Grants
FAPESP's process: 17/13230-5 - Partial ethanol reforming: stability and selectivity of mix metal amphoteric oxides as catalysts for atmospheric pressure flow reaction
Grantee:Mauricio Boscolo
Support type: Program for Research on Bioenergy (BIOEN) - Regular Program Grants
FAPESP's process: 18/15733-7 - Evaluation of the use of hydrochar for agricultural purposes and of magnetic coal as adsorbent material
Grantee:Márcia Cristina Bisinoti
Support type: Program for Research on Bioenergy (BIOEN) - Regular Program Grants
FAPESP's process: 17/26718-6 - Humic Substances of Hydrochar and soils Amazon Dark Earth: Interactions with Macro and Micronutrients
Grantee:Altair Benedito Moreira
Support type: Regular Research Grants
FAPESP's process: 17/05408-9 - Characterization of humic substances extracted from hydrochar and terra mulata soil from Amazon Region
Grantee:João Vitor dos Santos
Support type: Scholarships in Brazil - Scientific Initiation
FAPESP's process: 18/09914-9 - Humic and fulvic acids from hydrochar and anthropogenics soils: complexation capacity and characterization using molecular fluorescence
Grantee:João Vitor dos Santos
Support type: Scholarships abroad - Research Internship - Scientific Initiation