Indoor formaldehyde removal by catalytic oxidation, adsorption and nanofibrous membranes: a review

Nallathambi, Gobi

doi:10.1007/s10311-020-01168-6

Cited by 68 publications

(27 citation statements)

References 158 publications

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“…Further, photocatalysis of formaldehyde may generate undesirable byproducts. As alternates, nonthermal plasma and biomaterial-filtration methods have been proposed to reduce the concentration of formaldehyde in the air [7,8]. Non-thermal plasma can efficiently oxidize low concentrations of formaldehyde.…”

Section: Introductionmentioning

confidence: 99%

A Brief Review of Formaldehyde Removal through Activated Carbon Adsorption

Kang

Jang

et al. 2022

Applied Sciences

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Formaldehyde is a highly toxic indoor pollutant that can adversely impact human health. Various technologies have been intensively evaluated to remove formaldehyde from an indoor atmospheres. Activated carbon (AC) has been used to adsorb formaldehyde from the indoor atmosphere, which has been commercially viable owing to its low operational costs. AC has a high adsorption affinity due to its high surface area. In addition, applications of AC may be diversified by the surface modification. Among the different surface modifications for AC, amination treatments of AC have been reported and evaluated. Specifically, the amine functional groups of the amine-treated AC have been found to play an important role in the adsorption of formaldehyde. Surface modifications of AC by impregnating and/or grafting the amine functional groups onto the AC surface have been reported in the literature. The impregnation of the amine-containing species on AC is mainly achieved by physical interaction or H-bond of the amines to the AC surface. Meanwhile, the grafting of the amine functional groups is mainly conducted through chemical reactions occurring between the amines and the AC surface. Herein, the carboxyl group, as a representative functional group for grafting on the surface of AC, plays a key role in the amination reactions. A qualitative comparison of amination chemicals for the surface modification of AC has also been discussed. Thermodynamics and kinetics for adsorption of formaldehyde on AC are firstly reviewed in this paper, and then the major factors affecting the adsorptive removal of formaldehyde over AC are highlighted and discussed in terms of humidity and temperature. In addition, new strategies for amination, as well as the physical modification option for AC application, are proposed and discussed in terms of safety and processability.

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Section: Introductionmentioning

confidence: 99%

A Brief Review of Formaldehyde Removal through Activated Carbon Adsorption

Kang

Jang

et al. 2022

Applied Sciences

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“…It causes respiratory problems, leukemia, asthma, and other diseases [1][2][3][4]. Therefore, the effective removal of formaldehyde in the environment is a necessity [5][6][7][8][9]. Photocatalysis is an appropriate and promising technology for environmental applications, of which the absorption of photon energy from solar-light by photocatalysts can drive redox reactions of formaldehyde at room temperature [10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Highly Active Amino-Fullerene Derivative-Modified TiO2 for Enhancing Formaldehyde Degradation Efficiency under Solar-Light Irradiation

Fan

Wang

et al. 2022

Nanomaterials

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Formaldehyde (HCHO) is a ubiquitous indoor pollutant that seriously endangers human health. The removal of formaldehyde effectively at room temperature has always been a challenging problem. Here, a kind of amino-fullerene derivative (C60-EDA)-modified titanium dioxide (C60-EDA/TiO2) was prepared by one-step hydrothermal method, which could degrade the formaldehyde under solar light irradiation at room temperature with high efficiency and stability. Importantly, the introduction of C60-EDA not only increases the adsorption of the free formaldehyde molecules but also improves the utilization of sunlight and suppresses photoelectron-hole recombination. The experimental results indicated that the C60-EDA/TiO2 nanoparticles exhibit much higher formaldehyde removal efficiency than carboxyl-fullerene-modified TiO2, pristine TiO2 nanoparticles, and almost all other reported formaldehyde catalysts especially in the aspect of the quality of formaldehyde that is treated by catalyst with unit mass (mHCHO/mcatalyst = 40.85 mg/g), and the removal efficiency has kept more than 96% after 12 cycles. Finally, a potential formaldehyde degradation pathway was deduced based on the situ diffuse reflectance infrared Fourier transform spectrometry (DRIFTS) and reaction intermediates. This work provides some indications into the design and fabrication of the catalysts with excellent catalytic performances for HCHO removal at room temperature.

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“…2,3 Exposure to formaldehyde even as low as 0.3-0.5 ppm over short-term periods of time can cause eyes and nasal passages to be irritated due to formaldehyde. 4 Exposure to formaldehyde at larger than 1 ppm concentration for extended time causes serious health issues, such as lung function decline, liver injury, and other pathologies. 5 Removing formaldehyde from indoor air is particularly vital to maintain human health since more than 80% time of people's life are spent in indoors.…”

Section: Introductionmentioning

confidence: 99%

Excellent room temperature catalytic activity for formaldehyde oxidation on a single-atom iron catalyst in a moist atmosphere

Liu

Zhang

zhang³

et al. 2022

Preprint

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For human safety, efficient removal of formaldehyde in indoor environments is essential. However, removing formaldehyde from indoor environment given the temperature and moisture remains a challenge. In this study, a metal-organic framework-based single-atom iron catalyst (FeSA) is proposed as a candidate catalyst for oxidation of formaldehyde. The optimal structure between different coordination environments of FeSA was screened by density functional theory (DFT) calculation. Guided by the theoretical results, FeSA with 5 nitrogen coordination (FeSA-N5-C) was selected and prepared experimentally for evaluation. The activity tests revealed that the removal efficiency of formaldehyde reached 85.5% at 25°C and 75% relative humidity, which is not possible for traditional catalysts. More importantly, moisture boosts catalytic oxidation of formaldehyde to some extent, illustrating that FeSA-N5-C is robust for practical applications. To our knowledge, this is the first report of single-atom catalyst for catalytic oxidation of formaldehyde, opening up a new avenue for design of high activity and strongly water-resistant catalysts.

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Indoor formaldehyde removal by catalytic oxidation, adsorption and nanofibrous membranes: a review

Cited by 68 publications

References 158 publications

A Brief Review of Formaldehyde Removal through Activated Carbon Adsorption

A Brief Review of Formaldehyde Removal through Activated Carbon Adsorption

Highly Active Amino-Fullerene Derivative-Modified TiO2 for Enhancing Formaldehyde Degradation Efficiency under Solar-Light Irradiation

Excellent room temperature catalytic activity for formaldehyde oxidation on a single-atom iron catalyst in a moist atmosphere

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