Banca de DEFESA: RICARDO RAFAELL DA SILVA

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : RICARDO RAFAELL DA SILVA
DATE: 28/11/2022
TIME: 13:30
LOCAL: SALA DE REUNIÕES
TITLE:

Production and characterization of biochar from cassava peel biomass: evaluation with nutrient and contaminant.

KEY WORDS:

pyrolysis; contaminants adsorption; nutrients release; soil conditioner; residues reuse.

PAGES: 87
BIG AREA: Ciências Exatas e da Terra
AREA: Química
SUMMARY:

The development of Brazilian agriculture and agribusiness is one of the main sectors responsible for the country’s economic and social growth. This development leads to a significant increase in the waste generated during the process of production and industrialization, which may cause soil and water contamination when improperly disposed. Brazil is one of the main cassava producers in the world. However, the process of obtaining products from this culture brings concern about a large amount of waste generated. In addition, the anthropogenic activities are main responsible for environmental contamination, bringing constant concerns and challenges to the scientific community. The biochar from slow pyrolysis under controlled conditions is favorable in the transformation of waste into materials that serve as soil conditioners, and/or environmental remediation. Thus, this work aimed to produce and characterize biochar from cassava peel (agro-industrial residues) under different temperature conditions and evaluate interactions with Pb(II) and Ca(II) for agricultural and environmental applications. The biochar were characterized by thermogravimetric analysis, infrared spectroscopy and X-ray diffraction, in addition to determination of metallic species by microwave plasma atomic emission spectroscopy, pH and zero charge point pH. To investigate the efficiency of the interaction of biochar with contaminant (Pb) and nutrient (Ca), the influence of pH and contact time were evaluated. The elemental analysis showed the influence of the pyrolysis temperature on the biochar characteristic. There was an increase in pH, pHzpc (zero point charge), and condensed aromatic structures in biochar, due to the increase in pyrolysis temperature. Also, biochar demonstrated a Pb(II) adsorbed amount of 2.03 to 2.37 mg g–1 and a Ca(II) release amount of 0.655 to 0.765 mg g–1 . The pseudo-second order kinetic model better described the kinetic behavior of both metal ions in the investigated adsorbent, the biochar from cassava peel. Among the adsorption isotherm models, the  Langmuir model better described the experimental data for Pb(II) and Ca(II) for biochar produced at lower temperatures (350 °C and 450 °C), while the Freundlich model, demonstrated better ability to describe Ca(II) adsorption for biochar produced at higher temperatures (500 °C and 550 °C). The maximum adsorption capacity of Pb(II) and Ca(II) were 37.27 mg g-1 and 16.31 mg g-1, respectively, being achieved with the biochar produced at the highest pyrolysis temperature (550 °C). The complexing capacity of the biochar was 37.60 mg g-1 to 39.11 mg g-1 for Pb(II) and from 8.66 mg g-1 to 14.21 mg g-1 for Ca(II). In this way, biochar produced from residues of cassava peel can be a viable strategy to enhance agricultural production and reduce environmental contaminants.

BANKING MEMBERS:
Presidente - 1697766 - WANDER GUSTAVO BOTERO
Interno(a) - 1904678 - JANAINA HEBERLE BORTOLUZZI
Externo(a) ao Programa - 1852567 - ANDREA PIRES FERNANDES
Externo(a) à Instituição - DANIELLE GOVEIA - UNESP
Externo(a) à Instituição - LUCIANA CAMARGO DE OLIVEIRA - UFSCAR