Urea/nitric acid co-impregnated pitch-based activated carbon fiber for the effective removal of formaldehyde

Ryu, Dong Yeon; Shimohara, Takaaki; Nakabayashi, Koji; Miyawaki, Jin; Park, Joo Il; Yoon, Seong Ho

doi:10.1016/j.jiec.2019.07.036

Cited by 32 publications

(10 citation statements)

References 37 publications

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“…For example, some scientists added formaldehyde scavengers, bio-particles or using in situ polymerization to reduce the formaldehyde emission [10][11][12][13]. In addition, many researchers try to use melamine or phenol as copolymerization modifier to reduce the formaldehyde emission of UF [14][15][16]. Kim found that the formaldehyde emission of UF modified by phenol decreased [17].…”

Section: Introductionmentioning

confidence: 99%

Preparation and Properties of the Urea-Formaldehyde Res-In/Reactive Halloysite Nanocomposites Adhesive with Low-Formaldehyde Emission and Good Water Resistance

Song

Chen

et al. 2021

Polymers

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Low-cost urea formaldehyde resin (UF)/reactive halloysite nanotubes (HNTs) nanocomposite adhesive was prepared successfully via in situ polymerization. The HNTs were modified to improve its compatibility with polymer. The XRD and FTIR results showed that physical and chemical interaction between the HNTs and polymer resin influenced the structure of UF owing to the functional groups on the HNTs. It is found from SEM images that the modified HNTs could be dispersed uniformly in the resin and the nanocomposite particles were spherical. The performance experiment confirmed that thermal stability of nanocomposite increased largely, formaldehyde emission of UF wood adhesive reduced 62%, and water resistance of UF wood adhesive improved by 84%. Meanwhile, the content of HNTs on the nanocomposites could be up to 60 wt %. The mechanism of the nanocomposites based on the reactive HNTs was proposed. The approach of the preparation could supply an idea to prepare other polymer/clay nanocomposites.

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Section: Introductionmentioning

confidence: 99%

Preparation and Properties of the Urea-Formaldehyde Res-In/Reactive Halloysite Nanocomposites Adhesive with Low-Formaldehyde Emission and Good Water Resistance

Song

Chen

et al. 2021

Polymers

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“…A similar conceptual drawing can be seen elsewhere [59]. These physical bonds between aniline and the AC surface may be much weaker than the chemical bonds, but these bonds are still sufficient to hold dopants within the AC surface structure without detaching during the adsorption process [60]. The dopant was safely located within the AC surface structure with basic characteristics and surface polarity (π-electrons).…”

Section: Approaches To Chemical Modifications Of the Ac Surfacementioning

confidence: 78%

“…Other nitrogen-containing functional groups include -NH 2 , -NH, -C=N, and -C-N. Notably, -NH 2 (amine functional group) is attributed to the amine-aldehyde conjugation through covalent bonding and shows an enhanced adsorption capacity for FA [60]. Such nitrogen-containing functional groups have a strong affinity for water molecules on the adsorbent [20].…”

Section: Approaches To Chemical Modifications Of the Ac Surfacementioning

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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“…[10][11][12] Carter and co-workers [13] measured the maximum of FA adsorptivities of ACF at 20 ppm concentration were 400 mg/g. Ryu et al [14] developed an urea/nitric acid coimpregnated ACF for the removal of low-concentration FA gas, which showed a 110-fold (0.72 mg/g to 79.28 mg/g) improvement in its FA adsorptivity at 40 % humidity compared to that of pristine ACF. Rong et al [15] used heat treatment to enhance the FA adsorptivity from vapor generated from HCHO solution in water.…”

Section: Introductionmentioning

confidence: 99%

Amino‐Decorated Activated Carbon Fibers with Efficient Static Adsorptivity for Low‐Concentration Formaldehyde Gas in a Confined Space

et al. 2021

ChemistrySelect

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To develop an absorbent with high removal rate and adsorptivity for low‐concentration formaldehyde (FA) gas, amino‐decorated viscose‐based activated carbon fiber (VACF‐N) was synthesized by ethylenediamine (EDA) grafting process on the surface of viscose‐based activated carbon fiber (VACF). A simulated static adsorption of low‐concentration FA gas in a confined space was used as research target. For 2.45 and 8.15 ppm of FA gas, both the FA removal rate and the adsorptivity of VACF‐N were enhanced significantly after the EDA grafting process. The maximum of FA adsorptivity was 0.59 mg/g (1.92 times that of pristine VACF) for 2.45 ppm FA gases and 1.17 mg/g for 8.15 ppm FA gases. In particular, FA removal rate reached 100 % in only 28 minutes under the static adsorption of 2.45 ppm of FA gas. Predictably, VACF‐N has wide application prospects in the field of low‐concentration FA gas purification in a confined space.

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Urea/nitric acid co-impregnated pitch-based activated carbon fiber for the effective removal of formaldehyde

Cited by 32 publications

References 37 publications

Preparation and Properties of the Urea-Formaldehyde Res-In/Reactive Halloysite Nanocomposites Adhesive with Low-Formaldehyde Emission and Good Water Resistance

Preparation and Properties of the Urea-Formaldehyde Res-In/Reactive Halloysite Nanocomposites Adhesive with Low-Formaldehyde Emission and Good Water Resistance

A Brief Review of Formaldehyde Removal through Activated Carbon Adsorption

Amino‐Decorated Activated Carbon Fibers with Efficient Static Adsorptivity for Low‐Concentration Formaldehyde Gas in a Confined Space

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