On the performance and mechanisms of formaldehyde removal by chemi-sorbents

Pei, Jingjing; Zhang, Jianshun S.

doi:10.1016/j.cej.2010.11.106

Cited by 108 publications

(40 citation statements)

References 35 publications

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“…This indicates that other factors, such as, e.g., polarities or specific surface area, play just as important a role in the adsorption capability of the zeolites. This is confirmed by observations for other sorbent materials [44]. The values for ZSM-5 are comparatively high not only for pentanal but also for a-pinene while tending to be average for the other target substances.…”

Section: Screening Tests On Plasters and Plaster Constituentssupporting

confidence: 86%

Catalyzed Reactions on Mineral Plaster Materials Used for Indoor Air Purification

Gunschera¹,

Markewitz²,

Koberski³

et al. 2013

CLEAN Soil Air Water

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Zeolites have been used for a long time for purification and catalytical purposes. Recently, first products appeared on the market using zeolites also for improving the indoor air quality so far volatile organic compounds (VOC) are concerned. However, porous compounds like zeolites can be found also in plaster material. Therefore, it was manifest to evaluate the capability of plaster with regard to air cleaning. In this article, the contribution of plaster compounds toward adsorption and catalytical decomposition of VOCs is evaluated using a-pinene, chlorobenzene, 2-ethoxyethylacetate, and pentanal as target substances under standard conditions (238C, 50% r.H.). These compounds were chosen because of their VOC typical physicochemical properties like molecular dimensions, density, boiling point, vapor pressure, and octanol-water distribution coefficient (logk ow ). Hydrated lime and metakaolin were found out to have good adsorption properties under these circumstances. Also natural zeolites showed good results especially on pentanal. By investigations in environmental chambers the reduction potential of test plasters on chlorobenzene and 2-ethoxyethylacetate concentrations could be shown. Application of coatings had no or only temporary influence on the performance of the plaster. Additional tests in small chambers demonstrated the possibility to improve the properties of plasters with help of FAU-or MFI-type zeolites but the experiments also showed that a-pinene and pentanal undergo chemical reactions. Further effort should be made on investigations also toward other compounds, especially more volatile ones like formaldehyde. Also additional building materials like insulation material or boards should be taken into account.

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Section: Screening Tests On Plasters and Plaster Constituentssupporting

confidence: 86%

Catalyzed Reactions on Mineral Plaster Materials Used for Indoor Air Purification

Gunschera¹,

Markewitz²,

Koberski³

et al. 2013

CLEAN Soil Air Water

View full text Add to dashboard Cite

show abstract

“…In general, researchers have focused on four main technologies for HCHO removal: adsorption (Pei and Zhang, 2011;Xu et al, 2013), photocatalytic oxidation (Yang et al, 2000), thermal catalytic oxidation (Chen et al, 2011), and plasma technology (Zhao et al, 2011). As an approach that is environmentally benign, efficient and conserves energy, adsorption is receiving increased attention.…”

Section: Introductionmentioning

confidence: 99%

“…Activated carbon is the most widely used adsorbent, but its efficiency is not optimal due to its limited adsorption capacity. Pei and Zhang (2011) put activation treatment on commercial activated carbon, but the adsorption capacity under 2.36 ppm of formaldehyde was only 0.36 mg g -1…”

Section: Introductionmentioning

confidence: 99%

High-Performance Amino-Functional Graphene/CNT Aerogel Adsorbent for Formaldehyde Removal from Indoor Air

Sun

Yang

et al. 2017

Aerosol Air Qual. Res.

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A flexible approach prepares amino-functional graphene aerogels with different additions of carbon nanotubes (CNTs) for use as an adsorbent to study the adsorption performance of formaldehyde in indoor air. Experimental results indicated that the decoration of amino groups offers a greater number of chemical adsorption sites, which mainly contributed to the improvement of the chemical adsorption capacity of graphene aerogels, and the breakthrough time increased from 0 to 390 min g -1 under 3.7 ppm of formaldehyde. The addition of CNTs can significantly enhance the adsorption properties. More interestingly, the breakthrough time presents a substantial increase from 390 to 20,300 min g -1 when the mass ratio of CNTs and graphene increased from 0:1 to 2:1 and then decreased to 18,000 min g -1 at the ratio of 3:1. The addition of CNTs weakens the agglomeration degree and achieves a greater number of adsorption sites by playing a supportive and connective role among graphene sheets. However, more CNTs will agglomerate, and fewer functional groups on the surface limit additional amounts. The adsorption mechanism was also studied by analyzing the surface specific area and N content. This work provides new insights into the application of amino-functional graphene aerogels with the additions of CNTs (AGCAs) as a potential adsorbent to eliminate indoor formaldehyde pollution.

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“…On the one hand, high-RH induced condensed water may attract water-soluble or hydrophilic gas species and hence enhance their uptake (Pei and Zhang, 2011), or decrease their net emission. This mechanism applies, e.g., to hydrophilic formaldehyde and formic acid (see Table S.3 for respective Henry's law constants).…”

Section: Voc Exchange Dependence On Environmental Parameters 30mentioning

confidence: 99%

Physicochemical uptake and release of volatile organic compounds by soil in coated-wall flow tube experiments with ambient air

Guo¹,

Cheng²,

Kühn³

et al. 2018

Preprint

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On the performance and mechanisms of formaldehyde removal by chemi-sorbents

Cited by 108 publications

References 35 publications

Catalyzed Reactions on Mineral Plaster Materials Used for Indoor Air Purification

Catalyzed Reactions on Mineral Plaster Materials Used for Indoor Air Purification

High-Performance Amino-Functional Graphene/CNT Aerogel Adsorbent for Formaldehyde Removal from Indoor Air

Physicochemical uptake and release of volatile organic compounds by soil in coated-wall flow tube experiments with ambient air

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