Enhanced adsorption of benzene vapor on granular activated carbon under humid conditions due to shifts in hydrophobicity and total micropore volume

Liu, Hanbing; Yang, Bing; Xue, Ning

doi:10.1016/j.jhazmat.2016.07.026

Cited by 110 publications

(23 citation statements)

References 36 publications

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“…Similar results have been observed for natural minerals by Zhang et al . and granular activated carbon by Liu et al …”

Section: Resultssupporting

confidence: 93%

“…The possible reason is that the space of pores is filled with water clusters, and the adsorption sites are unavailable for adsorption of xylene and EA. Similar results have been observed for natural minerals by Zhang et al 14 and granular activated carbon by Liu et al 30 The influence of initial concentrations on the removal efficiency of sole xylene and EA is shown in Figs 2(e) and 2(f) respectively. The initial concentrations have an influence on the adsorptive removal of xylene or EA.…”

Section: Effects Of Key Parameters On Adsorption Performance Of Sole supporting

confidence: 86%

See 1 more Smart Citation

Coadsorption of gaseous xylene, ethyl acetate and water onto porous biomass carbon foam pellets derived from liquefied Vallisneria natans waste

Sun

Yuan

Liu

et al. 2020

J of Chemical Tech & Biotech

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BACKGROUND Only a few studies have focused on the purification of waste gas containing a mixture of volatile organic compounds (VOCs) with engineered biochar. The adsorption behaviors of gaseous xylene and ethyl acetate (EA) individually and in binary mixture onto porous biomass carbon foam pellets (BCFPs) were studied by static headspace gas chromatography. RESULTS The removal efficiency nearly reached 100% for 17.32 mg L−1 xylene and 18.02 mg L−1 EA within 120 min at a BCFP dosage of 0.2 g L−1, a temperature of 40 °C and a relative humidity of 30%. The adsorption behavior followed the pseudo‐second‐order kinetic model for single and binary mixtures of xylene and EA. The coexistence of xylene had considerable influence on the adsorption performance of EA, whereas the coexistence of EA exhibited minimal effect on the adsorption performance of xylene. The monolayer adsorption capacities of sole xylene and EA were 250.63 and 206.61 mg g−1 respectively. The total adsorption capacity reached 322.36 mg g−1 for the binary mixture, but the adsorption capacity for sole xylene and EA decreased because of competitive adsorption. The adsorption process was spontaneous and endothermic. Pore filling was involved in the adsorption of xylene and EA onto BCFPs. Meanwhile, xylene adsorption was involved in the hydrophobic interaction and π–π electron dispersion interaction. CONCLUSION BCFPs are an effective adsorbent for VOC adsorptive removal from waste gas. Competitive adsorption between xylene and EA on BCFPs was determined. Results indicated that the physicochemical properties of VOCs had an effect on the adsorption performance. © 2019 Society of Chemical Industry

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“…Similar results have been observed for natural minerals by Zhang et al . and granular activated carbon by Liu et al …”

Section: Resultssupporting

confidence: 93%

Section: Effects Of Key Parameters On Adsorption Performance Of Sole supporting

confidence: 86%

Coadsorption of gaseous xylene, ethyl acetate and water onto porous biomass carbon foam pellets derived from liquefied Vallisneria natans waste

Sun

Yuan

Liu

et al. 2020

J of Chemical Tech & Biotech

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show abstract

“…By an inter-comparison between bare-AC and PDMS-coated (polydimethylsiloxane) ACs, Liu et al concluded that benzene adsorption on ACs was mainly governed by hydrophobicity and total micropore volume under humid conditions, i. e., increasing total micropore volume and hydrophobicity enhance the benzene storage capacity. [36]…”

Section: Benzene Storage On Activated Carbonmentioning

confidence: 99%

“…[15b,37] Due to the aluminum-free MFI character of the channels and excellent hydrophobic properties, TS-1 zeolite was also shown to be a most potential substrate for C 6 H 6 storage. The storage capacities of C 6 H 6 over HZSM-5 with different SiO 2 /Al 2 O 3 [36] Activated carbon fibers (ACFs) 200 298 � 1 Dynamic method using fixed bed unit 3.97 [45] NaOCl-oxidized carbon nanotubes 627-62692 298 Static method: 110 mL glass bottles with addition of 60 mg of adsorbents 2.72 [46] Activated carbons 200 298 � 1 Dynamic method using fixed bed unit; flow rate 90 ml/min; sample weight is 0.1 g 4.36 [34] 5 Å molecular sieve zeolite 20-56 298 Dynamic method using fixed-bed unit, various flow rates (1.0-2.7 ml/min), bed weights (30-60 g) 6.33 [37b] Hierarchically porous diatomite/MFI-type zeolite 36919.5 298 -1.03 [47] PtAg/HZSM-5 10 298…”

Section: Benzene Storage On Zeolitesmentioning

confidence: 99%

Catalytic Materials for Low Concentration VOCs Removal through “Storage‐Regeneration” Cycling

Chen

et al. 2019

ChemCatChem

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Compared with other approaches for the removal of VOCs, the concept of “storage‐regeneration” cycling is proposed as an effective and promising way to eliminate low‐concentration indoor VOCs. A key issue in this approach is the design of catalytic materials which should possess balanced properties between storage and regeneration. The materials used for the storage of VOCs such as formaldehyde and benzene should not only possess high and selective VOC storage capacity, but also be easily regenerated without any release of the VOCs or generation of secondary pollutants. To this end, appropriate regeneration methods have been proposed, including thermal regeneration, plasma (nonthermal plasma) oxidation or ozone enabled regeneration. In this short review, these essential features of the cycled “storage‐regeneration” concept for VOC destruction are considered and the prospects for the implementation of this technology are assessed.

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“…The results revealed that the benzene adsorption quantity of the synthesized adsorbent only reaches to 48.3 μmol/g. Moreover, Liu et al investigated the adsorption characteristics of benzene on hydrophobic‐modified granular activated carbons coated with polydimethylsiloxane (PDMS).…”

Section: Introductionmentioning

confidence: 99%

Vegetal fiber paper matrix impregnated with silica gel for benzene removal

Dai

et al. 2019

Indoor Air

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Removing benzene from indoor space plays an important role in indoor air purification. A novel filter with vegetal fiber paper (VFP) as matrix hosting silica gel is proposed in this paper for benzene removal. In order to investigate the feasibility and performance of this idea, firstly, three pieces of VFP samples impregnated with different amounts of silica gel are fabricated and their benzene adsorption quantities are tested. The results show that three times is recommended as the optimal number for impregnating. The VFP sample impregnated with silica gel after the third impregnating exhibits commendable coating stability and good benzene adsorption performance. Additionally, at low relative pressure (Pb/Ps ≤ 0.05), the experimental data of benzene adsorption isotherms fit well with the Langmuir model with R2 greater than 0.97. Then, two actual filters made of VFP impregnated with silica gel after the third impregnating were fabricated. It is found that the pressure drop of the actual filter is only 1200 Pa/m when the air velocity is 2 m/s. Besides, the one‐pass efficiency of the filter can reach to 19.44%. It is expected that the silica gel coated on the filter can be modified to improve the purification performance of the filter.

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Enhanced adsorption of benzene vapor on granular activated carbon under humid conditions due to shifts in hydrophobicity and total micropore volume

Cited by 110 publications

References 36 publications

Coadsorption of gaseous xylene, ethyl acetate and water onto porous biomass carbon foam pellets derived from liquefied Vallisneria natans waste

Coadsorption of gaseous xylene, ethyl acetate and water onto porous biomass carbon foam pellets derived from liquefied Vallisneria natans waste

Catalytic Materials for Low Concentration VOCs Removal through “Storage‐Regeneration” Cycling

Vegetal fiber paper matrix impregnated with silica gel for benzene removal

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