Estimating isotherm parameters of drying clay for the ceramic industry of Sergipe, Brazil

Assessment of sulfamethoxazole adsorption capacity on Pirangi clay from the State of Sergipe, Brazil, modified by heating and addition of organic cation

“…It was observed that the mass loss for PIR was higher than PIR-100 because the loss was related to water loss and dehydroxylation of the clays, and part of water content was probably eliminated with the heat treatment at 100 °C. The org-PIR-100 thermogram showed decomposition in 3 stages; the first occurred between 25 and 130 °C, with a peak identified by DTG at 70 °C attributed to the removal of physically adsorbed water, equivalent to 0.4% of mass loss [17,34,35]. The maximum peak at 250 °C and mass loss of 10.8% between 170 and 320 °C were characterized by loss of physically adsorbed surfactant [36,41].…”

“…3 shows the TG and DTG curves of the clays. The thermograms of the PIR and PIR-100 clays showed two decomposition stages; the first occurred between 25 and 170 °C, with the maximum peak identified by the DTG at 90 °C attributed to the removal of physically adsorbed water, and equivalent to 1.7% and 1.4% of mass loss, respectively [17,40,41]. The thermal events between 170 and 700 °C with the maximum peak at 470 °C and loss of mass of 4.4% for PIR clay and 3.1% for PIR-100 clay were attributed to dehydroxylation in the clay layers.…”

“…It has several clay mines located in the municipalities of Itabaiana, Nossa Senhora do Socorro, Siriri, Cedro de São João, Laranjeiras, Santana of São Francisco and Simão Dias. Due to this production, clay studies are concentrated in structural and tile ceramics, but studies in the area of adsorption of organic compounds are still poorly investigated or reported [14][15][16][17][18].…”