Synthesis of Al2O3/AlN composite powders by plasma processed Al2O3with various additives

Boey, Freddy Yin Chiang; Zhao, Xiling; Tok, Alfred Iing Yoong

doi:10.1557/jmr.2004.0182

Cited by 4 publications

(2 citation statements)

References 17 publications

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“…Furthermore, in case of (GA) small sharp peaks appeared associated with some metals oxide. The peaks around 2θ ≈ 31˚and 35˚ may attributed to F2O3 [47], 2θ ≈ 28.3˚ and 47.5˚ for SiO2 [48], 2θ ≈ 32,47˚and 62˚ for Al2O3 [49], 2θ ≈ 28.3˚, 31˚, 38.1˚ and 54.5˚ for CaO [50], 2θ ≈ 29˚, 37.5˚, 49˚, 57˚, 60˚, 65˚ For MnO2 [51], 2θ ≈ 60˚ MgO [52], 2θ ≈ 38˚,48˚,55˚and 62˚ for TiO2 [53]. Also, these metal oxide peaks appears with low intensity in case of (OSMG), due to the few amount of this supported metals particles deposited on the surface of the porous using microwave support and the high dispersion of metal oxides species.…”

Section: Characterization Of Adsorbents 311 X-ray Diffractionmentioning

confidence: 97%

Synthesis of Activated Carbon Composited With Egyptian Black Sand for Enhanced Adsorption Performance toward Methylene Blue Dye

ElKholy

Yahia²,

El-Nawawy

et al. 2022

Preprint

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The present study reports the feasibility of the synthesis of a novel porous activated carbon (OS400) composite adsorbent prepared from olive stone and impregnated with garnet (GA) types of black sand minerals. The Activated Carbon/ garnet composite (OSMG) was applied for the sorption of macromolecular organic dye. The structural characteristics of the synthesized composite were evaluated by Brunauer–Emmett–Teller (BET), N2 adsorption/desorption measurements, Scanning Electron Microscopy equipped with Energy Dispersive X-ray spectroscopy (SEM-EDX), X-ray diffraction (XRD), and a Fourier transform infrared spectrometer (FT-IR). The specific surface area of (GA), (OS400), and (OSMG) were 5.157 m2.g− 1, 1489.598 m2.g− 1, and 546.392 m2.g− 1, respectively. The high specific surface area and effective active centers of the new composite promoted the adsorption of methylene blue (MB). The experiments were carried out under various conditions such as contact time, initial concentration of adsorbate, adsorbent dosage, pH, and temperatures. The equilibrium adsorption data were evaluated using the Langmuir and Freundlich isotherm models. The results display that, the adsorption isotherm had an excellent fitting to the Freundlich model. Furthermore, the data obtained from adsorption kinetic models showed that the pseudo-second-order model more agreeing for describing the (MB) adsorption reaction, suggesting a chemisorption mechanism. The values of thermodynamic parameters indicate that methylene blue dye adsorption onto the (GA) adsorbents through an endothermic reaction, while exothermic sorption of MB onto (OS400) and (OSMG), with a non-spontaneous process.

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Section: Characterization Of Adsorbents 311 X-ray Diffractionmentioning

confidence: 97%

Synthesis of Activated Carbon Composited With Egyptian Black Sand for Enhanced Adsorption Performance toward Methylene Blue Dye

ElKholy

Yahia²,

El-Nawawy

et al. 2022

Preprint

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“…Because in the discharge zone, active N-containing species, such as excited N 2 , atomic N, and N or N 2 ions, were produced [39][40][41][42] at a higher applied power with a higher plasma density. [43,44] by the following reaction: Al 2 O 3 + N 2 + 3CO = 2AlN + 3CO 2 . In our previous study, CuO thin film was also successfully reduced to Cu 2 O in atmosphericpressure microwave plasma [22].…”

Section: Cu 2 O Nanowires Produced By Rf Plasma Reductionmentioning

confidence: 99%

Preparation of Cu2O nanowires by thermal oxidation-plasma reduction method

Chen

Kuo

et al. 2012

Appl. Phys. A

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Facial synthesis of cuprous oxide (Cu 2 O) nanowires by directly heating copper substrates is difficult; however, in this study, it was successfully done by thermal oxidation followed by a plasma reduction process. The preparation of CuO nanowires with an average diameter of 76.2 nm supported on the surface of copper substrate was conducted first in air at 500°C for 3 hrs, and then the CuO nanowires were reduced into Cu 2 O in 15 min using either radio frequency (RF) N 2 plasma or microwave (MW) N 2 plasma. The characteristics of CuO and Cu 2 O nanowires were analyzed using XRD, FE-SEM, and TEM. The results showed that Cu 2 O nanowires can be successfully reduced from CuO nanowires by a simple, promising, and fast nitrogen plasma process. Moreover, in RF plasma, narrower and longer Cu 2 O nanowires can be produced as compared to MW plasma, because energetic N-containing species can reduce the nanowires at a relatively lower temperature.

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Synthesis of activated carbon composited with Egyptian black sand for enhanced adsorption performance toward methylene blue dye

ElKholy

Yahia²,

El-Nawawy

et al. 2023

Sci Rep

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The present study reports the feasibility of the synthesis of a novel porous composite adsorbent, prepared from olive stone activated carbon (OS400) and garnet (GA) mineral impregnations (referred to as OSMG). This composite (OSMG) was applied for its ability to adsorb a macromolecular organic dye. The composite’s structural characteristics were evaluated using various techniques such as Brunauer–Emmett–Teller (BET), Scanning Electron Microscopy equipped with Energy Dispersive X-ray spectroscopy (SEM–EDX), X-ray diffraction (XRD), and a Fourier transform infrared spectrometer (FT-IR). The specific surface area of the garnet (GA), (OS400), and (OSMG) were found to be 5.157 mg⋅g−1, 1489.598 mg⋅g−1, and 546.392 mg⋅g−1, respectively. The specific surface area of the new composite (OSMG) was promoted to enhance the adsorption of methylene blue (MB). Experiments were conducted under various conditions, including contact time, initial dye concentration, adsorbent dosage, pH, and temperatures. Data from these experiments were analyzed using several adsorption models including Langmuir, Freundlich, Temkin, and Dubinin-Radushkevich (D-R). The results indicated that, the adsorption fit best with the Freundlich model and that the adsorption process followed a pseudo-second-order kinetic mechanism. Additionally, the thermodynamic analysis indicated the adsorption of MB onto garnet(GA) adsorbents is endothermic, while the sorption onto (OS400) and (OSMG) is an exothermic and non-spontaneous process. The OSMG composite can be used for at least five cycles without significant loss of adsorptive performance, and can easily be separated from the water after treatment.

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Synthesis of Al₂O₃/AlN composite powders by plasma processed Al₂O₃with various additives

Cited by 4 publications

References 17 publications

Synthesis of Activated Carbon Composited With Egyptian Black Sand for Enhanced Adsorption Performance toward Methylene Blue Dye

Synthesis of Activated Carbon Composited With Egyptian Black Sand for Enhanced Adsorption Performance toward Methylene Blue Dye

Preparation of Cu2O nanowires by thermal oxidation-plasma reduction method

Synthesis of activated carbon composited with Egyptian black sand for enhanced adsorption performance toward methylene blue dye

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