Thermogravimetric and spectroscopic study (TG–DTA/FT–IR) of activated carbon from the renewable biomass source Babassu

Abstract

carbons (ACs) with well-developed microstructure and high microporosity were obtained from biomass by potassium hydroxide activation. The preparation process consisted in producing carbon materials in the ratios of activating agent to raw material 70:30, 50:50, 30:70 and 25:75 (w/w) characterized by thermal analysis coupled to spectroscopy (TG-DTA / FT-IR), scanning electron microscopy (SEM), N 2 adsorption isotherms at -196 °C and activation isotherm at 500 and 600 °C for 3.0 h. Specific surface areas (SBET) within 728 and 1712 m 2 g -1 and (S mic ) within 1054 and 1923 m 2 g -1 were obtained, while the micropores surface area was calculated using the Dubinin-Astakhov (DA) equation and the pore size distribution calculated from density functional theory (DFT) was found to be in the range 1.09 -1.77 nm. Adsorption isotherms were fitted using Langmuir and Freundlich non-linear models and the adsorption capacity determined for methylene blue dye was between 27.13 and 459.20 mg g -1 .

Polyethylene terephthalate waste‐derived activated carbon for adsorptive desulfurization of dibenzothiophene from model gasoline: Kinetics and isotherms evaluation

“…The skeletal stretch vibration of (CC) was found at 1162 cm −1 , whereas the stretching vibration of (CCC) in an aromatic ring was beholden at 1580 cm −1 . The observed functional groups are consistent with the literature for other AC samples 38,39 …”

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“…The TG curve was observed five stages of weight loss in a temperature range of (30-100°C), (100-200°C), (200-300°C), (300-400°C) and (400-470°C) respectively. The first stage of weight loss occurred in the range temperature of 30-100°C due to water evaporation surface of the nanospheres, 25 and weight loss in the later stages was due to evaporation of useful water and organic compounds in the super paramagnetic nanospheres. 26,27 That its weight loss was consistent with the presence of two exothermic peaks around 300°C and 430°C (Figure 6 A) for Fe 3 O 4 /A/β-CD and 300°C and 420°C (Figure 6B ) for Fe 3 O 4 /A/ β-CD/CP in the DTA curve, respectively.…”

Microbiological Properties of Microwave-Activated Carbons Impregnated with Enoxil and Nanoparticles of Ag and Se

“…As it can be seen from the DTG curves, the profiles of both curves are similar up to 320 • C, indicating the same thermal processes, namely, the elimination of water molecules from the mesoand micropores. Starting at 320 • C, a distinctive decomposition was observed on the DTG curve of the oxidized activated carbon, with the maximum decomposition observed at 395 • C. In the range of 486-675 • C, a new characteristic transformation was observed, with a maximum at 548 • C. The shape of both curves over this range indicates complex processes, resulting from the overlapping of several elementary stages [22]. After 800 • C, a similar thermal degradation took place up to 1000 • C, with a loss of mass of 10% in both cases, caused by the transformation of the phosphoric acid residues and the carbonaceous shell.…”