Banca de QUALIFICAÇÃO: JÉSSICA CAROLAINE VIEIRA DE AZEVEDO

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : JÉSSICA CAROLAINE VIEIRA DE AZEVEDO
DATE: 05/07/2023
TIME: 14:00
LOCAL: Sala 110 (Sala Multimídia) - Bloco 2 - CAP/UFSJ
TITLE:

Boron removal from synthetic sample by adsorption on graphene oxide

KEY WORDS:

Boron Removal; Adsorption; Optimization; Graphene Oxide

PAGES: 74
BIG AREA: Engenharias
AREA: Engenharia Química
SUMMARY:

The numerous oxidation states of the element boron bring great challenges in containing its contamination in receptor bodies. Over the years this scenario increases significantly in recent years due to the widespread use of boron compounds in various industries. For this reason, the removal of this contaminant is receiving worldwide attention. Although adsorption is a promising method to solve this problem, finding suitable adsorbents with cost of application and recovery and at the same time efficient in boron removal, still remains a constant challenge. Thus, this work had as main objective to evaluate the applicability of pure graphene oxide and modified with calcium chloride as adsorbent in the removal of boron from diluted aqueous solutions in a batch system. Batch adsorption sweep tests were carried out to remove boron using malt bagasse, malt bagasse carbon, calcium alginate, calcium alginate impregnated with muse flower, graphene oxide and graphene oxide impregnated with calcium chloride. The adsorbent that showed the best results in terms of removal percentages and adsorptive capacity was graphene oxide. It was observed that the adsorption process of boron in GO can occur in a wide range of pH, which is advantageous at an industrial level due to the variations of its real effluents. At pH 2.5 the percentage of boron removal and adsorptive capacity was 80% 3.43 mg.g-1 and at pH 8.5 it was 90% and 3.96 mg.g-1, respectively. Subsequently, tests will be carried out through a planning of experiments, using the rotational central composite design (DCCR) method, seeking to find the effects of pH, adsorbent granulometry, agitation time, initial concentration of boron and solid/liquid ratio on the adsorption capacity of boron. The adsorption tests to obtain the isotherms will be performed by evaluating different solid/liquid ratios (5.0; 10.0; 25.0; 50.0; 75.0; 100.0; 150.0; and 200 .0 g of graphene/kg of effluent) and carried out in a shaker incubator, at 25.0±0.1 °C and 150±1 rpm, for the equilibrium time determined in the kinetic studies. As for the tests to determine the adsorption kinetics, thermodynamics and equilibrium time, they will be performed by evaluating the optimized solid/liquid ratio and conducted in a shaker incubator, at three different temperatures (15.0±0.1 °C, 25 ,0±0.1 °C and 35.0±0.1 °C) and 150±1 rpm, for 48 hours.

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