This paper presents the preparation of carbon conditioned with iron nanoparticles (CI) using a pineapple peel treated with iron salts, carboxymethylcellulose sodium and hexamine. First, the pineapple peel was analyzed...This paper presents the preparation of carbon conditioned with iron nanoparticles (CI) using a pineapple peel treated with iron salts, carboxymethylcellulose sodium and hexamine. First, the pineapple peel was analyzed by thermo gravimetric analysis (TGA) to determine the optimal temperature for pyrolysis. The formation of carbon conditioned by iron nanoparticles was studied as a function of time at 30 min, 60 min, 90 min, 120 min, 150 min and 180 min. Scanning electron microscopy (SEM) was used to identify changes in the morphology of the materials. The specific area of each material was obtained by the BET method. The elemental composition of pineapple-peel (PP), washed pineapple-peel (WPP) and carbon iron (CI), was determined by neutron activation analysis (NAA). The results show that the optimal time for obtaining spherical iron nanoparticles with a diameter between 10 nm and 30 nm is 180 min on the carbonaceous material with a specific surface area of 167 m2/g.展开更多
This work describes the synthesis of organometallic titanium oxides using low-pressure plasmas of water on titanium tetrapropoxide (TTP) in solid phase with glow discharges in the 0.3 - 0.9 mbar, 100 - 150 W and 60 - ...This work describes the synthesis of organometallic titanium oxides using low-pressure plasmas of water on titanium tetrapropoxide (TTP) in solid phase with glow discharges in the 0.3 - 0.9 mbar, 100 - 150 W and 60 - 240 min intervals. The accelerated particles in the plasma promoted chemical reactions which produced the partial separation of organic and inorganic parts of TTP with the consequent formation of TiO in organometallic films and particles with photosensitivity. These compounds could hardly be obtained by conventional chemical synthesis. The size of particles was calculated in the 50 - 414 nm interval. The elemental analysis of the titanium oxides indicates that the C/Ti and O/Ti atomic ratios are in the 0.63 - 0.54 and 1.89 - 1.96 intervals respectively, depending on the conditions of synthesis, which suggests that the organic residues are approximately half of the inorganic content. This proportion affects the X-ray diffraction of the organometallic compounds making them essentially amorphous;however, they may have overlapped arrangements resembling some faces of anatase, at 25.3o and 32.5o, and rutile, at 43o, phases. The electrical conductivity of TiO between 20℃ and 100℃ was from 10–10 to 10–12 S/m with activation energy in the 0 - 2.12 eV interval with 3 tendencies associated with temperature.展开更多
文摘This paper presents the preparation of carbon conditioned with iron nanoparticles (CI) using a pineapple peel treated with iron salts, carboxymethylcellulose sodium and hexamine. First, the pineapple peel was analyzed by thermo gravimetric analysis (TGA) to determine the optimal temperature for pyrolysis. The formation of carbon conditioned by iron nanoparticles was studied as a function of time at 30 min, 60 min, 90 min, 120 min, 150 min and 180 min. Scanning electron microscopy (SEM) was used to identify changes in the morphology of the materials. The specific area of each material was obtained by the BET method. The elemental composition of pineapple-peel (PP), washed pineapple-peel (WPP) and carbon iron (CI), was determined by neutron activation analysis (NAA). The results show that the optimal time for obtaining spherical iron nanoparticles with a diameter between 10 nm and 30 nm is 180 min on the carbonaceous material with a specific surface area of 167 m2/g.
文摘This work describes the synthesis of organometallic titanium oxides using low-pressure plasmas of water on titanium tetrapropoxide (TTP) in solid phase with glow discharges in the 0.3 - 0.9 mbar, 100 - 150 W and 60 - 240 min intervals. The accelerated particles in the plasma promoted chemical reactions which produced the partial separation of organic and inorganic parts of TTP with the consequent formation of TiO in organometallic films and particles with photosensitivity. These compounds could hardly be obtained by conventional chemical synthesis. The size of particles was calculated in the 50 - 414 nm interval. The elemental analysis of the titanium oxides indicates that the C/Ti and O/Ti atomic ratios are in the 0.63 - 0.54 and 1.89 - 1.96 intervals respectively, depending on the conditions of synthesis, which suggests that the organic residues are approximately half of the inorganic content. This proportion affects the X-ray diffraction of the organometallic compounds making them essentially amorphous;however, they may have overlapped arrangements resembling some faces of anatase, at 25.3o and 32.5o, and rutile, at 43o, phases. The electrical conductivity of TiO between 20℃ and 100℃ was from 10–10 to 10–12 S/m with activation energy in the 0 - 2.12 eV interval with 3 tendencies associated with temperature.
