Determination of the size of particles of highly dispersed materials by low temperature nitrogen adsorption

Zhilkina, A. V.; Gordienko, Andrey Alexandrovich; Prokudina, N. A.; Трусов, Л. И.; Кузьмичева, Г. М.; Dulina, N. A.; Савинкина, Е. В.

doi:10.1134/s0036024413040328

Cited by 10 publications

(5 citation statements)

References 8 publications

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“…Since a pore acts like a nanoreactor where zinc oxide nanocrystals are formed, it is likely to determine the size and morphological characteristics of the filler matrix nanocrystals. It was shown in [37] that submicron Y 2 O 3 spheres are characterized by a mesoporous structure with an average pore size of 2-8 nm. It can be seen in Fig.…”

Section: Resultsmentioning

confidence: 99%

Specific features of the structure of ZnO nanocrystals grown in pores of Y2O3 spherical matrices

et al. 2015

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A two-phase spherical Y 2 O 3 /ZnO nanocomposite particle with a diameter variable in the series of 70, 130, 180, 250, and 400 nm (variance ≤15%) has been obtained; the first phase is a mesoporous Y 2 O 3 matrix, while the second is a crystalline ZnО phase located in the size-limited pore volume. Specific features of ZnO nanocrystals formed on the high-curvature surface of pores with excess surface energy are studied. It is shown that the thermally activated coarsening of ZnO crystallites accompanied by an increase in the nanophase structural quality occurs during Y 2 O 3 /ZnO annealing in the temperature range t = 600-800°C. It is established that the wurtzite lattice is strained on the surfaces of small Y 2 O 3 pores.

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Section: Resultsmentioning

confidence: 99%

Specific features of the structure of ZnO nanocrystals grown in pores of Y2O3 spherical matrices

et al. 2015

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“…RM contains a small number of micropores and simple open porous channels. By contrast, the ARM contains not only micropores but also larger mesopores and macropores (micropores < 2.0 nm; smaller mesopores 2.0–10.0 nm; larger mesopores and macropores ≥ 10 nm) [ 25 ], and the channel structure is very complex, with a peak appearing at 150 nm. The average pore sizes of RM and ARM were 40.93 and 45.41 nm, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…The pH of the mixture was set to targeted levels (3.0, 5.0, 7.0, 9.0, or 11.0 ± 0.2) using 0.1 mol/L NaOH or HCl. Afterward, the flask was sealed and shaken (HZ-8811K bath thermostat oscillator, Deou Corporation, Changzhou, China) at 250 rpm under the predetermined temperature (25,35, or 45 ± 1 • C) for 180 min. Following centrifugation to isolate the ARM, the clear supernatant was passed through a 0.22 µm membrane, preparing it for analysis via high-performance liquid chromatography (HPLC, Agilent 1200, Santa Clara, CA, USA).…”

Section: Measurement Of Adsorption Capacitymentioning

confidence: 99%

Ciprofloxacin Removal via Acid-Modified Red Mud: Optimizing the Process, Analyzing the Adsorption Features, and Exploring the Underlying Mechanism

Shi,

Wang,

et al. 2024

Molecules

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In this study, RM (red mud) was acidified with sulfuric acid, and the acidified ARM (acidified red mud) was utilized as an innovative adsorption material for treating antibiotic-containing wastewater. The adsorption conditions, kinetics, isotherms, thermodynamics, and mechanism of ARM for CIP (ciprofloxacin) were investigated. The characterization of the ARM involved techniques such as scanning electron microscopy (SEM), transmission electron microscopy (TEM), Brunauer–Emmett–Teller (BET), X-ray diffraction (XRD), X-ray fluorescence (XRF), thermogravimetric analysis (TGA), and NH3-TPD analysis. Adsorption studies employed a response surface methodology (RSM) for the experimental design. The results showed that ARM can absorb CIP effectively. The RSM optimal experiment indicated that the most significant model terms influencing adsorption capacity were solution pH, CIP initial concentration, and ARM dosage, under which the predicted maximum adsorption capacity achieved 7.30 mg/g. The adsorption kinetics adhered to a pseudo-second-order model, while equilibrium data fitted the Langmuir–Freundlich isotherm, yielding maximum capacity values of 7.35 mg/g. The adsorption process occurred spontaneously and absorbed heat, evidenced by ΔGθ values between −83.05 and −91.50 kJ/mol, ΔSθ at 281.6 J/mol/K, and ΔHθ at 0.86 kJ/mol. Analysis using attenuated total reflection Fourier-transform infrared spectroscopy (ATR-FTIR) indicated a complex reaction between the Al–O in the ARM and the ester group –COO in CIP. The C=O bond in CIP was likely to undergo a slight electrostatic interaction or be bound to the internal spherical surface of the ARM. The findings indicate that ARM is a promising and efficient adsorbent for CIP removal from wastewater.

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“…RM contains a small number of micropores and simple open porous channels. By contrast, the ARM contains not only micropores but also larger mesopores and macropores (micropores < 2.0 nm; smaller mesopores 2.0 -10.0 nm; larger mesopores and macropores ≥10 nm) (Zhilkina et al, 2013), the channel structure was very complex, with a peak appearing at 150 nm. The average pore size of RM and ARM were 40.93 and 45.41 nm, respectively.…”

Section: Bet-bjh Analysismentioning

confidence: 99%

Ciprofloxacin Removal via Acid-Modified Red Mud: Optimizing the Process, Analyzing the Adsorption Features, and Exploring the Underlying Mechanism

Shi,

Wang,

et al. 2024

Preprint

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RM (red mud) was acidified with sulphuric acid and the acidified ARM (acidified red mud) was utilized as an innovative adsorption material for treating antibiotic-contained wastewater. The adsorption conditions, kinetics, isotherms, thermodynamics, and mechanism of ARM for CIP (ciprofloxacin) were investigated. Characterization of the ARM involved techniques such as scanning electron microscopy(SEM), transmission electron microscope(TEM), brunauer- emmett-teller (BET), X-ray diffraction (XRD), X-ray fluorescence (XRF), thermogravimetric analysis (TGA) and NH3-TPD analysis. Adsorption studies were conducted employing response surface methodology (RSM) for experimental design. The results showed that ARM can absorb CIP effectively. The RSM optimal experiment indicated that the most significant model terms influencing adsorption capacity were solution pH, CIP initial concentration and ARM dosage, under which the predicted maximum adsorption capacity achieved 7.30 mg/g. The adsorption kinetics adhered to a pseudo-second-order model, while equilibrium data fitted the Langmuir-Freundlich isotherm, yielding maximum capacity values of 7.35 mg/g. The adsorption process occurred non-spontaneously and absorbed heat, evidenced by ΔG0 values between 2.06 and 0.87 kJ/mol, ΔS0 at 39.41 J/mol/K, and ΔH0 at 13.8 kJ/mol. Analysis using attenuated total reflection Fourier-transform infrared spectroscopy (ATR-FTIR) indicated there existed complex reaction between Al-O in ARM and the ester group –COO in CIP. The C=O bond in CIP was likely to undergo a slight electrostatic interaction or be bound to the internal spherical surface of ARM. The findings indicate that ARM is a promising and efficient adsorbent for CIP removal from wastewater.

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Determination of the size of particles of highly dispersed materials by low temperature nitrogen adsorption

Cited by 10 publications

References 8 publications

Specific features of the structure of ZnO nanocrystals grown in pores of Y2O3 spherical matrices

Specific features of the structure of ZnO nanocrystals grown in pores of Y2O3 spherical matrices

Ciprofloxacin Removal via Acid-Modified Red Mud: Optimizing the Process, Analyzing the Adsorption Features, and Exploring the Underlying Mechanism

Ciprofloxacin Removal via Acid-Modified Red Mud: Optimizing the Process, Analyzing the Adsorption Features, and Exploring the Underlying Mechanism

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