Banca de QUALIFICAÇÃO: VALDIVINO FRANCISCO DOS SANTOS BORGES

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
DISCENTE : VALDIVINO FRANCISCO DOS SANTOS BORGES
DATA : 15/06/2018
HORA: 14:30
LOCAL: Auditório do NUPPRAR
TÍTULO:

REMOVAL OF METAL ICONS FROM EFFLUENTS USING CLAMPS TREATED WITH MICROEMULSIONS

PALAVRAS-CHAVES:

Clays, Diatomite, Adsorption, Iron, chromium and lead ions, Microemulsions.

PÁGINAS: 130
GRANDE ÁREA: Ciências Exatas e da Terra
ÁREA: Química
SUBÁREA: Físico-Química
ESPECIALIDADE: Química de Interfaces
RESUMO:

Heavy metals have contributed significantly to air, water and soil pollution, interfering temporarily or permanently in the maintenance of terrestrial and aquatic biota. As a result of the industrial development, large amounts of water contained in rivers, lakes and seas have been contaminated by heavy metals, mainly due to the great catastrophes that have occurred in mining industries that destroy the environment and harm human health,  for instance, the event occurred in Mariana, Minas Gerais, where huge amounts of effluents with iron and other wastes were dumped in the waters of the Rio Doce. The need to get alternative methods that present adsorbents with high efficiency and low cost (AABC) in the removal of effluents makes the adsorption process a viable alternative. Thus, the objective of this work was to evaluate the adsorption capacity of sodium bentonite clay, commercial bentonite clay and diatomite clay, treated and not treated with microemulsion, in the removal of iron, lead and chromium ions present in synthetic solutions used as effluents. The microemulsion is composed of distilled water, kerosene, n-butanol and Ultrol L90. A composition with a direct micelle was chosen. Ten grams of each clay were treated by soaking in thirty milliliters of microemulsion for twenty minutes, then heated for forty-eight hours in an oven at constant temperature of 65°C. Removal of ions from the synthetic solutions at 10 ppm was carried out in a thermostated bath at 60°C for two hours at a rotation of 126 rpm. The untreated clays went through the same process. After evaluating the efficiency of ion removal, comparing the three treated and untreated clays, it was observed that the adsorption capacity for the treated clays is superior, reaching values close to 100% as in the case of diatomite. This clay presented the most effective as to the removal efficiency, as well as in the solid-liquid separation process when this clay is used in the removal of metallic ions. Therefore, diatomite was characterized by X-ray Fluorescence (FRX) techniques to determine its chemical composition; X-ray diffraction (XRD), to determine the crystalline structure of the material; Scanning Electron Microscopy (SEM), to determine the surface morphology; BET, to determine its surface area; Thermal Differential and Thermogravimetric Analysis (ATD / ATG), to determine the mass loss of the material; Fourier Transform Infrared Spectroscopy (FTIR), to determine the organic compounds present in the clay; Atomic Flame Absorption Spectrometry (FAAS), to quantify the synthetic solutions. Finally, the diatomite treated with microemulsion stands out as a good adsorbent of metal ions, since it has removal efficiency of 83% for chromium and 100% for lead and iron, proving the efficacy of the used treatment. 

MEMBROS DA BANCA:
Presidente - 1753094 - ALCIDES DE OLIVEIRA WANDERLEY NETO
Externo ao Programa - 1804952 - FERNANDO JOSE VOLPI EUSEBIO DE OLIVEIRA
Interno - 1198847 - JOSE LUIS CARDOZO FONSECA
Interno - 1308577 - SIBELE BERENICE CASTELLA PERGHER