Banca de DEFESA: ARTHUR LUIS SILVA DE ARAUJO

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : ARTHUR LUIS SILVA DE ARAUJO
DATE: 29/07/2022
TIME: 09:00
LOCAL: Auditório do Departamento de Química
TITLE:

SYNTHESIS, CHARACTERIZATION AND EXPERIMENTAL PLANNING FOR APPLICATION OF IONIC CARBON DOT IN THE DETERMINATION OF METALS (Ag⁺, Bi₃+, Cd²⁺, Hg₂²⁺, Hg²⁺, Pb²⁺, Pt²⁺, Sb³⁺)

KEY WORDS:

fluorimetry; nanoparticles, chemometrics; uncles;
toxicity

PAGES: 85
BIG AREA: Ciências Exatas e da Terra
AREA: Química
SUBÁREA: Química Analítica
SPECIALTY: Métodos Óticos de Análise
SUMMARY:

Due to the growth of the world population in the last decades socio-environmental changes have been observed, such as changes in biological aspects of living beings and climate due to environmental impacts caused by anthropogenic action. The industrial sector that uses metals, specifically heavy metals, is one of the main responsible for the contamination of water and soil caused by improper disposal of effluents containing metals, mainly heavy metals. are wide applications of metals in products intended for society, however, also there are numerous harmful effects associated with these chemical species. This reason, it has been investing in research, science and development of technologies that treat, remove or reduce the percentage of metals in the nature. Commonly, the analysis of these analytes is performed by medium/high cost that requires skilled labor and high consumption of time and reagents. Therefore, new strategies are being sought to solve the problem of metals in places close to the sources that generate this type of pollutant. Based on this assumption, the objective of this work is to produce a fluorescent nanometer chemosenor (carbon dot) produced at from low-cost salts in order to increase the sensitivity to determination of (Ag⁺, Bi₃+, Cd²⁺, Hg₂²⁺, Hg²⁺, Pb²⁺, Pt²⁺, Sb³⁺) using a spectrofluorimeter as an alternative technique due to its advantages such as speed, high reproducibility and accessibility. A methodology was used hydrothermal synthesis of carbon dot with Na3Cit, NH4HCO3 and Na2S as
precursors. The carbon dots obtained were characterized using vibrational, luminescence and electron absorption spectroscopy. Subsequently, a complete type 25 experimental design was carried out. with physical and chemical parameters aiming to optimize the sensor synthesis. After optimizing the synthesis, previous studies were performed with vas deferens. metals, then the ones that obtained the best interactions were submitted to evaluation of pH range and buffer nature. For the species analyzed (Ag⁺, Bi₃+, Cd²⁺, Hg₂²⁺, Hg²⁺, Pb²⁺, Pt²⁺, Sb³⁺) curves were constructed analysis, where the satisfactory relationships stand out: [yPb²⁺ = 0.0095x + 1.0270; R = 0.9976 / yHg²⁺ = 0.0051x + 01.0052; R = 0.9768), showing the feasibility of the proposed method for the analysis of the evaluated metals. 

BANKING MEMBERS:
Presidente - 1625689 - ANDRE FERNANDO LAVORANTE
Interno - 2140782 - ALEX SOUZA MORAES
Externa ao Programa - 1884911 - MARIA JOSE DE FILGUEIRAS GOMES