The regulation of micro/mesoporous silica gel by polyethylene imine for enhancing the siloxane removal

Meng, Ze-You; Liu, Yuheng; Ma, Zichuan; Hou, Xifeng

doi:10.1016/j.inoche.2019.107754

Cited by 14 publications

(6 citation statements)

References 36 publications

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“…Inlet concentration is a significant factor influencing the adsorption process [ 44 ]. Figure 10 shows the curve of the t B,th and Q B,th change over C in .…”

Section: Resultsmentioning

confidence: 99%

Efficient Removal of Siloxane from Biogas by Using β-Cyclodextrin-Modified Reduced Graphene Oxide Aerogels

Zheng

Hou

et al. 2022

Nanomaterials

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In this study, β-cyclodextrin-modified reduced graphene oxide aerogels (β-CD-rGOAs) were synthesized via a one-step hydrothermal method and were used to remove hexamethyldisiloxane (L2) from biogas. The β-CD-rGOAs were characterized by the Brunner–Emmet–Teller technique, using Fourier-transform infrared spectroscopy, Raman spectrometry, scanning electron microscopy (SEM), contact angle measurements, and X-ray diffraction. The results of the characterizations indicate that β-CD was grafted onto the surface of rGOAs as a cross-linking modifier. The β-CD-rGOA had a three-dimensional, cross-linked porous structure. The maximum breakthrough adsorption capacity of L2 on β-CD-rGOA at 273 K was 111.8 mg g−1. A low inlet concentration and bed temperature facilitated the adsorption of L2. Moreover, the β-CD-rGOA was regenerated by annealing at 80 °C, which renders this a promising material for removing L2 from biogas.

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“…Inlet concentration is a significant factor influencing the adsorption process [ 44 ]. Figure 10 shows the curve of the t B,th and Q B,th change over C in .…”

Section: Resultsmentioning

confidence: 99%

Efficient Removal of Siloxane from Biogas by Using β-Cyclodextrin-Modified Reduced Graphene Oxide Aerogels

Zheng

Hou

et al. 2022

Nanomaterials

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“…Inspection of the linear correlation coefficients (R 2 ) for each fitted line showed that S BET (R 2 = 0.97; p < 0.05) and V micro (R 2 = 0.89; p < 0.05) were significantly associated with Q B , indicating that these were important parameters for the adsorption of L2. Since S BET is theoretically dependent on the abundance of micropores/mesopores in the structure, it may be inferred that the mechanism of adsorption of L2 on rGOAs may be dependent on capillary condensation and hydrophobic effects [ 16 , 17 , 18 ].…”

Section: Resultsmentioning

confidence: 99%

“…While these adsorbents are relatively low cost, simple to use [ 14 , 15 , 16 ] and high in adsorption capacity, their adsorption cycle performances are limited, restricting their practical applications. Previously, we developed a modified silica gel siloxane adsorbent with good recyclability and found that its adsorption performance was affected by its textural properties, such as the specific surface area ( S BET ), total pore volume ( V tot ), micropore volume ( V micro ) and contact angle [ 16 , 17 , 18 ]. Reduced graphene oxide aerogels (rGOAs) have good textural properties and strong hydrophobicity [ 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 ], although their application to biogas siloxane removal has not been reported.…”

Section: Introductionmentioning

confidence: 99%

The Effects of Hydrophobicity and Textural Properties on Hexamethyldisiloxane Adsorption in Reduced Graphene Oxide Aerogels

Hou

Zheng

et al. 2021

Molecules

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To expand the applications of graphene-based materials to biogas purification, a series of reduced graphene oxide aerogels (rGOAs) were prepared from industrial grade graphene oxide using a simple hydrothermal method. The influences of the hydrothermal preparation temperature on the textural properties, hydrophobicity and physisorption behavior of the rGOAs were investigated using a range of physical and spectroscopic techniques. The results showed that the rGOAs had a macro-porous three-dimensional network structure. Raising the hydrothermal treatment temperature reduced the number of oxygen-containing groups, whereas the specific surface area (SBET), micropore volume (Vmicro) and water contact angle values of the rGOAs all increased. The dynamic adsorption properties of the rGOAs towards hexamethyldisiloxane (L2) increased with increasing hydrothermal treatment temperature and the breakthrough adsorption capacity showed a significant linear association with SBET, Vmicro and contact angle. There was a significant negative association between the breakthrough time and inlet concentration of L2, and the relationship could be reliably predicted with a simple empirical formula. L2 adsorption also increased with decreasing bed temperature. Saturated rGOAs were readily regenerated by a brief heat-treatment at 100 °C. This study has demonstrated the potential of novel rGOA for applications using adsorbents to remove siloxanes from biogas.

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“…Among these technologies, physical adsorption through porous materials is considered to be very promising for VMS removal, due to its low cost, ease of operation, high efficiency, and great versatility [ 17 , 18 ]. In the past several years, many porous absorbent materials have been developed and thoroughly investigated, such as activated porous carbon materials, silica gel, molecular sieves, and reduced graphene oxide aerogel (rGOA), with properties compared in Table S1 [ 14 , 15 , 17 , 19 , 20 , 21 , 22 , 23 , 24 ]. Based on the previous review, despite the large specific surface area and highly developed porous structure, the recycling performance of activated porous carbon materials, silica gel, and molecular sieves is limited, owing to the presence of polar functional groups [ 25 , 26 , 27 ].…”

Section: Introductionmentioning

confidence: 99%

Removal of Hexamethyldisiloxane via a Novel Hydrophobic (3–Aminopropyl)Trimethoxysilane-Modified Activated Porous Carbon

Lv,

Wang,

Zheng

et al. 2023

Molecules

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Volatile methyl siloxanes (VMS) must be removed because the formation of silica in the combustion process seriously affects the resource utilization of biogas. Herein, a series of APTMS ((3–aminopropyl)trimethoxysilane)-modified activated porous carbon (APC) adsorbents (named APTMS@APC) were prepared for VMS efficient removal. The as-prepared adsorbents were characterized using SEM, FTIR, Raman, X-ray diffraction analyses, and N2 adsorption/desorption. The results showed that the surface modification with APTMS enhanced the hydrophobicity of APC with the water contact angle increasing from 74.3° (hydrophilic) to 127.1° (hydrophobic), and meanwhile improved its texture properties with the SBET increasing from 981 to 1274 m2 g−1. The maximum breakthrough adsorption capacity of APTMS@APC for hexamethyldisiloxane (L2, model pollutant) was 360.1 mg g−1. Effects of an inlet L2 concentration (31.04–83.82 mg L−1) and a bed temperature (0–50 °C) on the removal of L2 were investigated. Meanwhile, after five adsorption–desorption cycles, the APTMS@APC demonstrated a superior cycling performance. This indicated that the hydrophobic APTMS@APC has a great significance to remove VMS.

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The regulation of micro/mesoporous silica gel by polyethylene imine for enhancing the siloxane removal

Cited by 14 publications

References 36 publications

Efficient Removal of Siloxane from Biogas by Using β-Cyclodextrin-Modified Reduced Graphene Oxide Aerogels

Efficient Removal of Siloxane from Biogas by Using β-Cyclodextrin-Modified Reduced Graphene Oxide Aerogels

The Effects of Hydrophobicity and Textural Properties on Hexamethyldisiloxane Adsorption in Reduced Graphene Oxide Aerogels

Removal of Hexamethyldisiloxane via a Novel Hydrophobic (3–Aminopropyl)Trimethoxysilane-Modified Activated Porous Carbon

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