Banca de DEFESA: HUGO FELIPE VIANNA FIGUEIRA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : HUGO FELIPE VIANNA FIGUEIRA
DATE: 13/08/2020
TIME: 10:00
LOCAL: Departamento de Solos, sala 24 (Apresentação remota)
TITLE:

Lead and copper sorption in wastes from the extraction of humic substances from the poultry litter

KEY WORDS:

Adsorption, Biossorbent, Isotherms

PAGES: 70
BIG AREA: Ciências Agrárias
AREA: Agronomia
SUBÁREA: Ciência do Solo
SPECIALTY: Química do Solo
SUMMARY:

Due to anthropic actions, high concentrations of heavy metals are being found in the environment on a recurring basis, causing toxicity in living beings, contaminating surface and subsurface waters, soil, atmosphere and foods. Containment or chemical immobilization is a technique that aims to remove metals from the solution of the soil and aquatic media. The general objective of this work was to evaluate the waste potential of humic substances (SH) extraction from composted litter as a biosorbent of Pb and Cu and the influence of the composting time on the sorption of these two metals. For this purpose, its lead and copper sorption capacity was evaluated at different composting times. The waste was collected at different times of composting (30, 60, 90 and 120 days) from poultry litter, from the poultry pole of São José do Vale do Rio Preto - RJ. To characterize the organic structure of the waste, at different times of composting, the ¹³C-NMR spectroscopy technique was performed. The total content of heavy metals in the different composting times was also determined. For the Pb and Cu adsorption test, the laboratory Batch Method was used. The most appropriate isotherm model to describe the sorption of these metals, in the studied wastes, was determined using the IsoFit program. To compare the isotherm models, the determination coefficient (R²), the Akaike criterion (AIC), corrected Akaike information criterion (AICc), Akaike variation (ΔAICc) and the Akaike criterion weighting (AICw) were used as criteria. The model selected in general to describe the adsorption of Pb in the waste was the linear model and the model selected to describe the adsorption of Cu was Langmuir. For all composting times, there was a predominance of specific adsorption for lead and copper, in addition to an increase in recalcitrant structures and a decrease in aliphatic groups within 120 days of composting. By the Principal Component Analysis (PCA) it was possible to verify the preference of copper for more aromatic and stable chains, mainly, in the time of 120 days, however the lead shows affinity for more aliphatic chains and for the waste obtained at 90 days of composting.

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BANKING MEMBERS:
Presidente - 387263 - NELSON MOURA BRASIL DO AMARAL SOBRINHO
Externa à Instituição - FABIANA SOARES DOS SANTOS - UFF
Externo à Instituição - FARLEY ALEXANDRE DA FONSECA BREDA