Humic extracts from hydrochar and Amazonian Anthrosol: Molecular features and metal binding properties using EEM-PARAFAC and 2D FTIR correlation analyses

Author(s):Show less -

da Silva, Leila Soares ^[1] ; Constantino, Isabela Carreira ^[1] ; Bento, Lucas Raimundo ^{[2, 1]} ; Tadini, Amanda Maria ^[3] ; Bisinoti, Marcia Cristina ^[1] ; Boscolo, Mauricio ^[1] ; Ferreira, Odair Pastor ^[4] ; Mounier, Stephane ^[5] ; Piccolo, Alessandro ^[2] ; Spaccini, Riccardo ^[2] ; Cornelio, Marinonio Lopes ^[6] ; Moreira, Altair Benedito ^[1]

Affiliation

^[1] Sao Paulo State Univ, Inst Biosci Humanities & Exact Sci IBILCE, Dept Chem & Environm Sci, UNESP, Sao Jose Do Rio Preto, SP - Brazil

^[2] Univ Naples Federico II, Interdept Res Ctr Nucl Magnet Resonance NMR Envir, Naples - Italy

^[3] Brazilian Agr Res Corp Embrapa Instrumentacao, Sao Carlos, SP - Brazil

^[4] Univ Fed Ceara, Dept Phys, Lab Mat Funcionais Avancados LaMFA, Fortaleza, Ceara - Brazil

^[5] Univ Toulon & Var, Mediterranean Inst Oceanog, Toulon - France

^[6] Sao Paulo State Univ, UNESP, Inst Biosci Humanities & Exact Sci IBILCE, Dept Phys, Sao Jose Do Rio Preto, SP - Brazil

• Document type: Journal article
• Source: Chemosphere; v. 256, OCT 2020.
• Web of Science Citations: 0

Abstract

Organic matter plays many roles in the soil ecosystem. One property of the substance concerns the metal complexation and interaction with organic contaminants. In this sense, the humic substances (HS), a heterogeneous mixture of compounds, naturally derived from degradation of biomass, have been widely studied in environmental sciences. Recent advances showed a new way to produce humic-like substances (HLS) through hydrothermal carbonization of biomass. Thus, this study aimed to evaluate the HLS of hydrochars, produced by using a mixture of sugarcane bagasse and vinasse with sulfuric acid added (1 and 4% v/v), and to assess their interactions with metal ions, (Fe(III), Al(III), Cu(II) and Co(II)) using EEM-PARAFAC and a two-dimensional FTIR correlation analysis. The results were compared to the humic substances extracted from the Amazonian Anthrosol, as a model of anthropogenic organic matter. NMR analysis showed that humic-like extracts from hydrochar are mainly hydrophobic, while the soil has a greater contribution of polar moieties. The HLS and HS showed similar complexation capacities for Fe(III), Al(III) and Cu(II) assays. For Co(II) HLS exhibited larger affinities than HS. Two-dimensional correlation analysis FTIR showed that chemical groups may undergo conformational alteration with metal additions to achieve more stable arrangements (higher stability constant). Therefore, these results contribute more knowledge about the mechanism of HS and metal ion interaction, as well as showing that HTC can be an interesting option for HLS production, to be used as humic based materials. (C) 2020 Elsevier Ltd. 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 Opportunities: Regular Research 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 Opportunities: Regular Research Grants
• FAPESP's process: 17/05575-2 - Structural similarity of the humic substances from hydrochar obtained from vinasse and sugarcane bagasse with the Black Earth (TPI)
• Grantee: Lucas Raimundo Bento
• Support Opportunities: Scholarships in Brazil - Master