Characterization of humic substances extracted from hydrochar and terra mulata soil from Amazon Region

• Grant number: 17/05408-9
• Support type: Scholarships in Brazil - Scientific Initiation
• Effective date (Start): May 01, 2017
• Effective date (End): December 31, 2019
• Field of knowledge: Physical Sciences and Mathematics - Chemistry
• Principal researcher: Márcia Cristina Bisinoti
• Grantee: João Vitor dos Santos
• Home Institution: Instituto de Biociências, Letras e Ciências Exatas (IBILCE). Universidade Estadual Paulista (UNESP). Campus de São José do Rio Preto. São José do Rio Preto , SP, Brazil
• Associated scholarship(s): 18/09914-9 - Humic and fulvic acids from hydrochar and anthropogenics soils: complexation capacity and characterization using molecular fluorescence, BE.EP.IC

Abstract

In several regions of Amazon are found soils of pre-colombian origin and known as Terra Mulata, abundant in organic material as well as other macro and micronutrients, which guarantees high fertility taking humic substances as an important role. Many studies have sought to produce hydrochar, solid material abundant in carbon and nutrients from the hydrothermal carbonization of several humid biomasses. Considering the high availability of lignocellulosic biomass in Brazil, to highlight sugarcane bagasse and vinasse, this work has the main objective to produce hydrochar, followed by comparison of humic substances characteristics (humic acid - HA, fulvic acid - FA and Humin-H) present in this one with those found in Terra Mulata of the Amazon. For this to happen, the carbonization of vinasse and sugarcane bagasse as well as the re-carbonization of the "água mãe" in the presence of sulfuric and phosphoric acid will be done. HA, FA and H will be extracted from Terra Mulata and hydrochars produced following a methodology suggested by the International Humic Substances Society. In all samples will be made caracterization of humic and fulvic acids using UV-VIS Spectrophotometry, Molecular Fluorescence Spectroscopy, Infrared Spectroscopy, Elementary Analysis, and Cation Exchange Capacity. Then, it is expected that with the characterization of humic and fulvic acids it is possible to better understand the characteristics of the hydrochars allowing the understanding of the action in the soil, aiming its application as fertilizer. Once identified the characteristics of their humic substances, it will be possible to understand how the reaction conditions used in the production of the hydrochars modify the structures of the humic substances of them, making possible the determination of which reaction condition best meets the needs so that it acts as soil conditioning. (AU)

Scientific publications

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

DOS SANTOS, JOAO VITOR; FREGOLENTE, LAIS GOMES; LARANJA, MARCIO JUSTI; MOREIRA, ALTAIR BENEDITO; FERREIRA, ODAIR PASTOR; BISINOTI, MARCIA CRISTINA. Hydrothermal carbonization of sugarcane industry by-products and process water reuse: structural, morphological, and fuel properties of hydrochars. BIOMASS CONVERSION AND BIOREFINERY, v. 12, n. 1, SI, p. 153-161, JAN 2022. Web of Science Citations: 1.

DOS SANTOS, JOAO VITOR; FREGOLENTE, LAIS GOMES; MOUNIER, STEPHANE; HAJJOUL, HOUSSAM; FERREIRA, ODAIR PASTOR; MOREIRA, ALTAIR BENEDITO; BISINOTI, MARCIA CRISTINA. Fulvic acids from Amazonian anthropogenic soils: Insight into the molecular composition and copper binding properties using fluorescence techniques. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY, v. 205, DEC 1 2020. Web of Science Citations: 0.

DOS SANTOS, JOAO VITOR; FREGOLENTE, LAIS GOMES; MOREIRA, ALTAIR BENEDITO; FERREIRA, ODAIR PASTOR; MOUNIER, STEPHANE; VIGUIER, BRUNO; HAJJOUL, HOUSSAM; BISINOTI, MARCIA CRISTINA. Humic-like acids from hydrochars: Study of the metal complexation properties compared with humic acids from anthropogenic soils using PARAFAC and time-resolved fluorescence. Science of The Total Environment, v. 722, JUN 20 2020. Web of Science Citations: 1.