Adsorptive Removal of Formaldehyde from Air Using Mixed-Metal Oxides

Krishnamurthy, Anirudh; Thakkar, Harshul; Rownaghi, Ali A.; Rezaei, Fateme

doi:10.1021/acs.iecr.8b02962

Cited by 38 publications

(28 citation statements)

References 48 publications

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“…The MIL‐101 was synthesized according to a modified hydrothermal synthesis reported in our previous work, the γ‐alumina was synthesized according to a sol–gel procedure reported elsewhere, and the UVM‐7 silica that was synthesized following a modified procedure reported in our previous work . The materials were then functionalized with PEI ( M W = 800) using a conventional wet‐impregnation method.…”

Section: Methodsmentioning

confidence: 99%

Diffusion kinetics of CO₂ in amine‐impregnated MIL‐101, alumina, and silica adsorbents

Gelles

Rezaei

2019

AIChE Journal

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CO 2 sorption kinetics of poly(ethylenimine) (PEI)-impregnated MIL-101, γ-alumina, and UVM-7 silica were investigated by the zero-length column technique for the purpose of understanding the effect of amine content, adsorbent porosity, and adsorption temperature on CO 2 sorption rates. Each of the adsorbents was impregnated with three different amine contents (20, 35, and 50 wt%) and the effective diffusion time constants were determined at 25 C. For each respective adsorbent, it was found that increasing the amine content results in diminished diffusion rates. Additionally, it was found that the pore size of the support has a profound effect on diffusional kinetics, where microporous MIL-101 yielded substantially slow desorption rates upon amine-functionalization compared to mesoporous γ-alumina. PEIimpregnated UVM-7 silica was further investigated at 50 and 75 C in order to provide insight into the effect of temperature on sorption kinetics. The results indicated that PEI-impregnated UVM-7 exhibited faster sorption kinetics at higher temperatures. Upon desorption, PEI-UVM-7 silica exhibited two distinct regions of masstransfer control that occur at different sorption times. This is best explained by first the occurrence of surface diffusion followed by diffusion out of the bulky PEI polymer chains. The findings of this study provide novel kinetic characterizations on promising amino-adsorbents for carbon capture applications. K E Y W O R D S γ-alumina, CO 2 capture, diffusion time constant, MIL-101, UVM-7 silica, ZLC technique 1 | INTRODUCTION The rapid rise of anthropogenic CO 2 emissions resulting from fossil fuel combustion has been widely identified as the primary cause to the increase in global temperatures, due to the deleterious effects of this greenhouse gas. 1 Hence, development of cost-effective carbon capture processes is essential for mitigation of CO 2 emissions. 1-4 Aqueous monoethanol amine absorption is regarded as the benchmark technology for post-combustion CO 2 capture, but suffers from high-energy penalties upon solvent regeneration. 3 Alternatively, the direct removal of CO 2 from ambient air has arisen as an attractive option in recent years that could be implemented in residential areas to mitigate emissions resulting from transportation sources. 4,5 Therefore, solid-state adsorbents have been intensively studied as a viable, cost-effective alternative to absorption-based amine scrubbing for practical carbon capture applications. Solid adsorbents, traditionally including zeolites, carbon molecular sieves, activated carbons, activated alumina, and metal-organic frameworks (MOFs), are physical adsorbents and have been extensively studied due to their high efficiency, low regeneration requirements, and long-term stability. 6 However, these adsorbents suffer from inferior capture capacities compared to aqueous amine-scrubbing, as well as reduced working capacities in humidified conditions. 7 Therefore, recent research has focused on the incorporation of amine moieties

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Section: Methodsmentioning

confidence: 99%

Diffusion kinetics of CO₂ in amine‐impregnated MIL‐101, alumina, and silica adsorbents

Gelles

Rezaei

2019

AIChE Journal

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“…To remove indoor HCHO, various methods have been developed by numerous scientists and engineers from different fields, such as physical adsorption, − catalytic oxidation, − chemical reactions, − etc. Physical adsorption of HCHO by adsorbents is one of the most commonly used methods because it is user-friendly, economical, and efficient .…”

Section: Introductionmentioning

confidence: 99%

Amine-Containing Resin for Coating with Excellent Formaldehyde Removal Performance

Zhu

Xie

et al. 2021

Ind. Eng. Chem. Res.

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Formaldehyde (HCHO) is known to be a strong carcinogen, widely present in construction substances. To remove HCHO in the environment, we propose to graft organic amines to the chains of resins used in coatings, and when the indoor walls are coated by the materials containing such resins, HCHO can diffuse from the environment into the coatings to react with amines through irreversible nucleophilic addition. Specifically, we have introduced diallylamine (DA; as a comonomer) in poly(methyl methacrylate–butyl acrylate–methacrylic acid) (PMA) to form the DA–PMA resins through emulsion polymerization. It is found that the films formed from the DA–PMA resins with the mass fraction of DA from 1 to 5% can effectively remove HCHO. The largest average rate in HCHO removal has reached 0.198 mol h–1 kg–1 in the case of DA–PMA with 5% DA. In addition, the introduction of DA is able to improve the colloidal stability of DA–PMA particles, and the smoothness of the DA–PMA films is rather similar to that of pure PMA. Because of the cross-linking role of DA, the thermal stability of the DA–PMA polymers has been significantly improved with respect to pure PMA. It should be noted that a similar amine-containing resin was prepared using N,N′-methylenebis(2-propenamide) as the comonomer, but it did not perform as well as that made with DA. Proper theoretical (density functional theory) calculations provided an explanation and might enable one to predict in advance whether other related calculations might, or might not, work.

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“…This strategy decreased formaldehyde emissions. Krishnamurthy et al [11] focused on evaluating the dynamic adsorption of formaldehyde over binary mixed metal oxides (MMOs) such as zirconium dioxide/silicon dioxide, titanium dioxide/silicon dioxide with different metal ratios. The zirconia-based composites displayed a comparatively higher a nity to formaldehyde as compared to their titania-based counterparts at very dilute concentrations.…”

Section: Introductionmentioning

confidence: 99%

Decreasing Formaldehyde Emission from Particleboard Panels Fabricated by Adding Newly Phenolic Compounds as a Scavenger to Urea Formaldehyde Resin

Kord¹,

Movahedi²,

Adlnasab³

et al. 2021

Preprint

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This study focused on the influence of some novel scavengers on the physical, mechanical, and formaldehyde emission of particleboard produced with urea-formaldehyde resin. Three different scavengers, alizarin red sulfonate, alizarin yellow-GG, and chromotropic acid, were incorporated to the UF resin at 1, 3, 5, and 7% (by weight) loading levels based on the oven-dried weight of the resin. Other manufacturing parameters were kept constant in the producrion of particleboards. The results indicated that the formaldehyde emission of the particleboards significantly reduced with increasing amount of the scavengers. The lowest formaldehyde emission was found in the specimens containing alizarin red sulfonate (0.38 mg/l), followed by chromotropic acid (0.43 mg/l), and alizarin yellow-GG (0.49 mg/l), respectively, at 7 wt% loading level of the scavengers. Although the physical and mechanical properties of the particleboards decreased with the increasing content of the scavengers, they met the requirements of particleboards for interior fitments (including furniture) for use in dry conditions (P2 grade) of EN 312 standard. According to the results of technological properties and formaldehyde emission of the particleboards, it can be said that alizarin red sulfonate is the best scavenger among the investigated scavengers.

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Adsorptive Removal of Formaldehyde from Air Using Mixed-Metal Oxides

Cited by 38 publications

References 48 publications

Diffusion kinetics of CO₂ in amine‐impregnated MIL‐101, alumina, and silica adsorbents

Diffusion kinetics of CO₂ in amine‐impregnated MIL‐101, alumina, and silica adsorbents

Amine-Containing Resin for Coating with Excellent Formaldehyde Removal Performance

Decreasing Formaldehyde Emission from Particleboard Panels Fabricated by Adding Newly Phenolic Compounds as a Scavenger to Urea Formaldehyde Resin

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Adsorptive Removal of Formaldehyde from Air Using Mixed-Metal Oxides

Cited by 38 publications

References 48 publications

Diffusion kinetics of CO2 in amine‐impregnated MIL‐101, alumina, and silica adsorbents

Diffusion kinetics of CO2 in amine‐impregnated MIL‐101, alumina, and silica adsorbents

Amine-Containing Resin for Coating with Excellent Formaldehyde Removal Performance

Decreasing Formaldehyde Emission from Particleboard Panels Fabricated by Adding Newly Phenolic Compounds as a Scavenger to Urea Formaldehyde Resin

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Diffusion kinetics of CO₂ in amine‐impregnated MIL‐101, alumina, and silica adsorbents

Diffusion kinetics of CO₂ in amine‐impregnated MIL‐101, alumina, and silica adsorbents