helating properties of humic-like substances obtained from process water of hydrothermal carbonizatio

Author(s):Show less -

Santos, Vinicius S. ^[1] ; Moura, Bernardo R. ^[1] ; Constantino, Isabela C. ^[1] ; Metzker, Gustavo ^[1] ; Boscolo, Mauricio ^[1] ; Cornelio, Marinonio L. ^[2] ; Ferreira, Odair P. ^[3] ; Mounier, Jean L. S. ^[4] ; Hajjoul, Houssam ^[4] ; Bisinoti, Marcia C. ^[1] ; Junior, Francisco H. S. ^[3] ; Moreira, Altair B. ^[1]

Affiliation

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

^[2] Sao Paulo State Univ, Dept Phys, Inst Biosci Humanities & Exact Sci IBILCE, UNESP, Sao Jose Do Rio Preto, SP - Brazil

^[3] Univ Fed Ceara, Dept Phys, Fortaleza, Ceara - Brazil

^[4] Univ Toulon & Var, Aix Marseille Univ, Mediterranean Inst Oceanog, CNRS INSU, IRD, MIO UM 110, CS 60584, Toulon - France

• Document type: Journal article
• Source: ENVIRONMENTAL TECHNOLOGY & INNOVATION; v. 23, AUG 2021.
• Web of Science Citations: 0

Abstract

Recent studies have shown a new way of producing humic-like substances (HLS) from hydrochar prepared by hydrothermal carbonization of biomass. However, studies of HLS extracted from process water (PW) produced in hydrothermal carbonization process to the best of our knowledge are non-existent. In this work, hydrothermal carbonization of sugarcane bagasse and vinasse was performed under two concentrations of H2SO4 (1 and 4% w:w) followed of extraction of HLS from PW (HLS 1% and HLS 4%). The interaction of these compounds with Cu(II) ions revelated a complexation with high conditional stability constant (K ranged from 5.0 to 5.4) and high complexing capacity (CCc ranged from 3.1 to 3.9 mu mol mg(-1)). Elemental analysis and ash content showed that HLS 1% and HLS 4% both have high content of carbon, oxygen and inorganic compounds. In addition, the H/C molar ratio suggests that both HLS have aliphatic nature and O/C molar ratio acidic functional groups. FTIR analysis showed great variety of functional groups and also the presence of inorganic compounds. Excitation-Emission fluorescence matrices applied with complexation studies showed that interaction of HLS and Cu(II) occurs with two humic-like components. Data on Time Resolved Fluorescence Spectroscopy (TRFS) suggests that the mechanism of interaction between both HLS and Cu(II) occur by complexation. Furthermore, the infrared bidimensional analysis indicates that the binding sites for HLS 1% were in affinity order: COO = CO > C-H aliphatic, while for HLS 4% was: C-H aliphatic > CO. (C) 2021 Published by Elsevier B.V. (AU)

• FAPESP's process: 18/05673-7 - Interactions of nutrients with humic material extracted from process water of sugarcane bagasse with vinasse hydrothermal carbonization
• Grantee: Vinicius Sarracini Santos
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• 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