Adsorption of octamethylcyclotetrasiloxane (D4) on silica gel (SG): Retention mechanism

Sigot, Léa; Ducom, Gäelle; Germain, Patrick

doi:10.1016/j.micromeso.2015.04.016

Cited by 37 publications

(15 citation statements)

References 30 publications

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“…The results implied that SG was a suitable adsorbent for toluene adsorption with high concentration due to its rapid adsorption, high adsorption capacity (437.4 mg g -1 ) and longer lifetime. Sigot et al (2015) compared three adsorbents of AC, zeolite and SG for the adsorption of VOSiC at 25 ℃. It was found that SG was the most efficient adsorbent for VOSiC vapor, the adsorption capacity of which was 250 mg g -1 .…”

Section: Silica Gelmentioning

confidence: 99%

A critical review on VOCs adsorption by different porous materials: Species, mechanisms and modification methods

Zhu

Shen

Luo

2020

Journal of Hazardous Materials

622

193

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Volatile organic compounds (VOCs) have attracted world-wide attention regarding their serious hazards on ecological environment and human health. Industrial processes such as fossil fuel combustion, petrochemicals, painting, coatings, pesticides, plastics, contributed to the large proportion of anthropogenic VOCs emission. Destructive methods (catalysis oxidation and biofiltration) and recovery methods (absorption, adsorption, condensation and membrane separation) have been developed for VOCs removal.Adsorption is established as one of the most promising strategies for VOCs abatement thanks to its characteristics of cost-effectiveness, simplicity and low energy consumption. The prominent progress in VOCs adsorption by different kinds of porous materials (such as carbon-based materials, oxygen-contained materials, organic polymers and composites is carefully summarized in this work, concerning the mechanism of adsorbate-adsorbent interactions, modification methods for the mentioned porous materials, and enhancement of VOCs adsorption capacity. This overview is to provide a comprehensive understanding of VOCs adsorption mechanisms and up-to-date progress of modification technologies for different porous materials.

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Section: Silica Gelmentioning

confidence: 99%

A critical review on VOCs adsorption by different porous materials: Species, mechanisms and modification methods

Zhu

Shen

Luo

2020

Journal of Hazardous Materials

622

193

View full text Add to dashboard Cite

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“…It is reported that during the desorption of D4 on activated carbon and silica gel, a chemical transformation of D4 occurs in cyclic oligomers such as hexamethylcyclotrisiloxane limiting the thermal regeneration due to the closing of pores and therefore the decrease in the adsorption capacity of siloxanes of the regenerated material, consequently, silica gel (Sigot et al, 2015) and activated carbon (Tran et al, 2019a) cannot be used in further adsorption process. In this study, low regeneration time and temperature were needed for the desorption of D4 from EP, suggesting weak interactions between the silanol groups at expanded perlite surface and the siloxane D4.…”

Section: Adsorbent Regeneration Studiesmentioning

confidence: 99%

Siloxane removal for biogas purification by low cost mineral adsorbent

Pioquinto-García

Rodríguez

Martínez

et al. 2021

Journal of Cleaner Production

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The potential use of raw and expanded perlite as low-cost adsorbents for biogas purification has been investigated. The thermal expansion of perlite causes a reduction in the density of silanol groups from 2515.43 to 653.75 OH/nm 2 ; in contrast, the specific surface area of perlite increased two-fold due to the thermal expansion. To determine the equilibrium adsorption capacity and the adsorption kinetics batch experiments were conducted. The adsorption capacities are in the following order: activated carbon (6.8 mg/g) > silica gel (6.6 mg/g) > expanded perlite (5.81 mg/g) > raw perlite (5.6 mg/g) when compared at the same experimental conditions. The equilibrium adsorption data showed that perlite can be used to reduce the octamethylcyclotetrasiloxane concentration below 28 mg/m 3 , as recommended by leading manufacturers. The adsorption kinetics of octamethylcyclotetrasiloxane onto raw and expanded perlite followed the Linear-Driving Force model suggesting that the mass transfer is the ratecontrolling step. In addition to its low cost, expanded perlite has the advantage of requiring lower desorption temperature (200 ºC) for regeneration in comparison to the reported values for activated carbon (> 400 ºC) and fast desorption kinetics (20 min), which could contribute to a cleaner production of biogas.

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“…[43] After recycling for three times, the adsorbent shows excellent stability as compared to the significant loss of capacity for ACs and silica gel. [1,43,44]…”

Section: Adsorbent Regenerationmentioning

confidence: 99%

“…[19] D4 siloxane can interact with hydroxyl groups on the adsorbent surface by hydrogen bonding, and surface hydroxyl groups can function as active catalytic centers for ring-opening polymerization of siloxane. [1,44,46] However, lower or higher molecular weight siloxanes are not detected after one run, which is beneficial for the longevity and regeneration of the adsorbents. Acidic and basic sites on Al120-8h are also related to the better adsorption performance induced by polymerization, [47] which can also explain the 15% capacity loss in the third recycle of the adsorbent.…”

Section: Effect Of Textural Properties On D4 Siloxane Adsorption and Adsorbent Regenerationmentioning

confidence: 99%

Modified inverse micelle synthesis for mesoporous alumina with a high D4 siloxane adsorption capacity

Zhong

Jiang

Jafari

et al. 2017

Microporous and Mesoporous Materials

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In this work, mesoporous aluminas (MAs) with uniform and monomodal pores were fabricated via a modified inverse micelle synthesis method, using a non-polar solvent (to minimize the effect of water content) and short reaction time (for a fast evaporation process). The effects of reaction times (4-8 h), surfactant chain lengths (non-ionic surfactants), and calcination temperatures and hold times (450-600 o C; 1-4 h) on the textural properties of MA were studied. The targeted pore sizes of MA were obtained in the range of 3.1-5.4 nm by adjusting the surfactant and reaction time. The surface area and pore volume were controlled by the calcination temperature and hold time while maintaining the thermal stability of the materials. The tuned MA of the large mesopore volume achieved 168 mg/g octamethylcyclotetrasiloxane (D4 siloxane) adsorption capacity, a 32% improvement compared to commercially activated alumina. After three adsorption recycles, the synthesized MA still maintained approximate 85% of its original adsorption capacity, demonstrating a sustainable adsorption performance and high potential for related industrial applications.

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Adsorption of octamethylcyclotetrasiloxane (D4) on silica gel (SG): Retention mechanism

Cited by 37 publications

References 30 publications

A critical review on VOCs adsorption by different porous materials: Species, mechanisms and modification methods

A critical review on VOCs adsorption by different porous materials: Species, mechanisms and modification methods

Siloxane removal for biogas purification by low cost mineral adsorbent

Modified inverse micelle synthesis for mesoporous alumina with a high D4 siloxane adsorption capacity

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