Banca de DEFESA: TALITA LORENA DA SILVA DO NASCIMENTO

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : TALITA LORENA DA SILVA DO NASCIMENTO
DATE: 31/08/2021
TIME: 14:00
LOCAL: Remoto via Google meet
TITLE:

BIOADSORBENT DERIVED FROM THE AQUATIC PACHIRA Aubl.  FOR METALS REMOVING IN INDUSTRIAL EFFLUENTS

KEY WORDS:

adsorption, monguba, charcoal, wastewater treatment, adsorption column

PAGES: 104
BIG AREA: Engenharias
AREA: Engenharia Química
SUBÁREA: Tecnologia Química
SPECIALTY: Carvão
SUMMARY:

The use of agro-industrial products to remove contaminants through the adsorption process has been a sustainable alternative due to its renewable origin, abundance, low cost and efficiency compared to commercial coal. In this sense, the present study aimed to investigate the use of a bioadsorbent derived from the fruit peel of aquatic Pachira for the removal of metallic ions in aqueous solution. The bioadsorbent was produced by carbonization of the biomass husks at 450 °C, and characterized through immediate analysis, XRD, SEM, the zero charge potential, zeta potential, thermal analysis and Boehm titration. The full factorial design with central points was applied to optimize the adsorption tests and verify the influence of the concentration of Ni2+ and Cd2+ metallic ions, adsorbent mass and temperature on the removal capacity of such ions. The adsorption tests were developed using batch and fixed bed column systems. The kinetic models of the multielementary solutions showed that a chemisorption process occurred, whereas the isotherm models that best fit the experimental data were Freundlich and Langmuir for Ni2+ and Cd2+, respectively. The study of adsorption thermodynamics showed that the system, for both ions, is endothermic, since the ΔH values were positive, and that the adsorption conditions are non-spontaneous, indicated by the positive ΔG results. Furthermore, the results of ΔH >20 kJ/mol for both ions confirmed that the process occurred was that of chemisorption. The rupture curves showed that at a flow rate of 3mL/min and bed height of 12 cm there were better removal results, with the rupture time for the initial concentrations of 100 mg/L of Ni2+ and Cd2+ equal to 30 and 36 min, respectively. The adsorption capacity of metals in the fixed bed column was greater for Cd2+ than Ni2+, with removal of 99% and 89% respectively. It was observed that for adsorbate concentration of 100mg/L, the break-up time was reached very quickly, however, by decreasing the concentration to 45mg/L, this time was increased by about 6x. The bioadsorbent produced from the fruit peel of the Pachira aquática has the potential to remove metals in industrial effluents, providing sustainable valorization of a forest by-product through its application in effluent treatment systems.

BANKING MEMBERS:
Interno - 6347420 - MARCUS ANTONIO DE FREITAS MELO
Externa ao Programa - 2668814 - MAGNA ANGELICA DOS SANTOS BEZERRA SOUSA
Externa à Instituição - FABÍOLA DIAS DA SILVA CURBELO - UFPB
Externa à Instituição - KARINE FONSECA SOARES DE OLIVEIRA