Low-temperature CO2 adsorption on Titania nanotubes (TNTs)

Bhatta, Lakshminarayana Kudinalli Gopalakrishna; Seetharamu, S.; Chengala, Madhusoodana D.; Bhatta, Umananda M.; Venkatesh, Krishna

doi:10.1016/j.surfin.2017.06.001

Cited by 11 publications

(5 citation statements)

References 18 publications

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“…The R 2 values combined with the standard error of estimate indicate that the PSO model adequately describes CO 2 adsorption on coal. Furthermore, the PSO kinetic model analysis was used to predict CO 2 adsorption on solid adsorbents, as well as the previously observed relationship between the PSO rate constant, k a2 , and the diffusion coefficient of adsorbent microspheres in the unipore model, which says that CO 2 adsorption on coal is controlled by pore diffusion. − …”

Section: Resultsmentioning

confidence: 87%

“…The pseudo-first-order (PFO) kinetic model and pseudo-second-order (PSO) kinetics have been widely applied for predicting the gas phase adsorption of CO 2 on coal. − The equilibrium amount of CO 2 adsorbed on an intact bituminous coal specimen obtained using the manometric method at pressure ranges up to 5 MPa and temperatures of 298.15, 308.15, and 318.15 K were shown to be in good agreement with the PSO model . The rate-determining factor of adsorption was determined as the pore diffusion/condensation of CO 2 .…”

Section: Introductionmentioning

confidence: 93%

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Kinetics of Gas Phase CO₂ Adsorption on Bituminous Coal from a Shallow Coal Seam

et al. 2022

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This article examines the CO 2 adsorption−desorption kinetics of bituminous coal under low pressure injection (0.5 MPa) in the context of CO 2 sequestration in shallow level coal seams. This study used two different sizes of intact core samples of bituminous samples from seam no. 30 at the Experimental Mine Barbara (EMB) in Katowice, Poland. Manometric adsorption kinetics experiments were conducted on 50 mm dia. 60 mm long coal core samples (referred to as EMB1) and 50 mm dia. 30 mm long coal core samples (referred to as EMB2). The kinetics of adsorption at injection pressures ranging from 0.1 to 0.5 MPa were compared to those at elevated pressures ranging from 0.5 to 4.5 MPa. For the first time, intact sample adsorption−desorption data were fitted in pseudo first order (PFO), pseudo second order (PSO), and Bangham pore diffusion models. The PSO model fits the data better than the PFO model, indicating that bulk pore diffusion, surface interaction, and multilayer adsorption are the ratedetermining steps. Comparing the equilibrium amount of adsorbed (q e ) obtained for the powdered samples (9.06 g of CO 2 /kg of coal at 0.52 MPa) with intact samples (11.68 g/kg at 0.53 MPa and 7.58 g/kg at 0.52 MPa for the intact EMB1 and EMB2 samples) showed the importance of conducting experiments with intact samples. The better fit obtained with the Bangham model for lower pressure equilibrium pressures (up to 0.5 MPa) compared to higher pressure equilibrium pressures (4.5 MPa) indicates that bulk pore diffusion is the rate-determining step at lower pressures and surface interaction takes over at higher pressures. The amount of CO 2 trapped within the coal structure following the desorption experiments strengthens the case for intact bituminous coal samples' pore trapping capabilities.

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Section: Resultsmentioning

confidence: 87%

Section: Introductionmentioning

confidence: 93%

Kinetics of Gas Phase CO₂ Adsorption on Bituminous Coal from a Shallow Coal Seam

et al. 2022

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“…22,48 A modicação na composição do HDL Mg-Al-CO3, substituindo o ânion intercalado, CO3 2-, cátions divalentes, Mg 2+ , e trivalente, Al 3+ , produz novos materiais HDL com maior capacidade de adsorção de CO2. 48,[50][51][52][53][54][55][56] -Materiais mesoporosos As peneiras moleculares mesoporosas chamadas de M41S foram descobertas por pesquisadores da Mobil Oil Corporation, em 1992. 57 A família M41S é composta por materiais com três arranjos diferentes: a MCM-41 apresenta poros cilíndricos com arranjo espacial hexagonal, a MCM-48 apresenta poros cilíndricos com arranjo espacial tridimensional com simetria cúbica e a MCM-50 é uma fase lamelar.…”

Section: Figura 11 Esquema Estrutural Dos Hidróxidos Duplos Lamelaresunclassified

The Anthropocene and CO2: Processes of Capture and Conversion

Miranda¹,

Moura²,

Ferreira³

et al. 2018

Rev. Virtual Quim.

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Anthropocene is discussed in this article in the point of view of chemical CO2 capture, use and conversion. The processes and technologies of carbon capture are presented as well as some of the several ways of using or converting it into other chemicals. The technologies of precombustion, poscombustion, oxycombustion and chemical looping were discussed. The materials used for CO2 capture, including amines, solid adsorbents such as charcoal, zeolites, metal organic frameworks, double layer hydroxides and membranes, were briefly presented. The major direct industrial uses of CO2 were discussed for the obtention of key chemicals, such as urea, methanol, cyclic carbonates and carboxylic acids. Some routes were selected to be discussed in more detail, showing the better catalysts and processes in use or research. The comparison between capture and storage and capture and use is not so easy as it may be regarded initially because it depends on the process, technologies, raw materials, obtained products and the analysis of a careful up-todate life cycle (for the present market) of each process and route, which is already not available.

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“…However, the low theoretical capacity of about 316 mA h g −1 and problematic agglomeration of TiO 2 have restricted the wide utilization [23] . Therefore, researchers have been eager to develop a series of fabrication to synthesize TiO 2 based nanomaterials, including nanoparticles, nanofibers, nanotubes, and Nano flowers [24] . Among the various nanostructures, the intriguing titanate nanotubes received a wide range of applications due to the high surface area, chemical stability, and metal support interaction in alkali and acidic environments, [24–25] inspired by the discovery of carbon nanotubes (CNT) with superior properties [25a] .…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, researchers have been eager to develop a series of fabrication to synthesize TiO 2 based nanomaterials, including nanoparticles, nanofibers, nanotubes, and Nano flowers [24] . Among the various nanostructures, the intriguing titanate nanotubes received a wide range of applications due to the high surface area, chemical stability, and metal support interaction in alkali and acidic environments, [24–25] inspired by the discovery of carbon nanotubes (CNT) with superior properties [25a] . More recently, many researchers reported that the combination of TNTS with FeS nanoparticles could prevent FeS nanoparticles to aggregate and enhance the performance of composites for the treatment of heavy metal ions from effluent [23c,25b]…”

Section: Introductionmentioning

confidence: 99%

Adsorption Behavior of U(VI) and Re(VII) on Iron Sulfide Nanoparticles Modified with Titanate Nanotubes: Mechanism and Performance Insights

et al. 2023

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A novel nanocomposite (TNTs-FeS) was developed by anchoring ferrous sulfide (FeS) nanoparticles immobilized on titanate nanotubes (TNTs) by hydrothermal method to remove U(VI) and Re(VII) from aqueous solution, and the removal mechanism and efficiency were examined. The experimental results showed that the TNTs can effectively improve the dispersibility and stability of FeS. The environmental conditions, including initial solution pH, initial concentration, equilibrium time, and dosage, played an important role in the remediation process, which can affect the immobilization efficiency significantly. The maximum quantity removal of U(VI) and Re(VII) was 291.67 and 226.23 mg/g at pH of 6.0 and 12.0. The adsorption kinetics and the equilibrium isotherms of U(VI) and Re(VII) all fitted well with the pseudo-second-order model (R 2 > 0.99) and the Freundlich model (R 2 > 0.99). The main mechanism of removal by TNTs-FeS was electrostatic attraction, chemical reduction, and surface complexation. Thus, TNTs-FeS composites exhibited a high potential to remove U(VI) and Re(VII) heavy metal ions from the surface and groundwater.

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Low-temperature CO2 adsorption on Titania nanotubes (TNTs)

Cited by 11 publications

References 18 publications

Kinetics of Gas Phase CO₂ Adsorption on Bituminous Coal from a Shallow Coal Seam

Kinetics of Gas Phase CO₂ Adsorption on Bituminous Coal from a Shallow Coal Seam

The Anthropocene and CO2: Processes of Capture and Conversion

Adsorption Behavior of U(VI) and Re(VII) on Iron Sulfide Nanoparticles Modified with Titanate Nanotubes: Mechanism and Performance Insights

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Low-temperature CO2 adsorption on Titania nanotubes (TNTs)

Cited by 11 publications

References 18 publications

Kinetics of Gas Phase CO2 Adsorption on Bituminous Coal from a Shallow Coal Seam

Kinetics of Gas Phase CO2 Adsorption on Bituminous Coal from a Shallow Coal Seam

The Anthropocene and CO2: Processes of Capture and Conversion

Adsorption Behavior of U(VI) and Re(VII) on Iron Sulfide Nanoparticles Modified with Titanate Nanotubes: Mechanism and Performance Insights

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Kinetics of Gas Phase CO₂ Adsorption on Bituminous Coal from a Shallow Coal Seam

Kinetics of Gas Phase CO₂ Adsorption on Bituminous Coal from a Shallow Coal Seam