Formaldehyde (HCHO) is a harmful gas with serious health risks, including cancer. Effective removal of HCHO is essential for indoor air quality and health, rendering synthesis of δ-MnO2-enhanced activated carbon fibers (ACF@MnO2) crucial. ACF@MnO2 was successfully synthesized in a single step using the hydrothermal technique to grow MnO2 on the surface of activated carbon fibers (ACFs), using KMnO4 as a precursor. The ACF@MnO2 was characterized by Raman spectroscopy, X-ray diffraction spectroscopy, and transmission electron microscopy; the results reveal that δ-MnO2 with a dendritic structure was successfully synthesized on the surface of ACFs at 0.05 M and 120°C. A formaldehyde adsorption performance test showed that ACF@MnO2 has better adsorption performance than pure activated carbon fiber, with the HCHO removal efficiency remaining virtually at 98.7% for a reaction duration of 120 min and remaining extremely stable (94.3%) even after five repeating cycles. Furthermore, the shedding rate of MnO2 was maintained at 26.7% after five ultrasonic cleanings, and the formaldehyde removal rate was 89.41% following cyclic testing. All of this suggests that the synthesized ACF@MnO2 has the advantages of easy production, low cost, efficient adsorption, high repeatability, and environmental protection. This study presents a new technique for the long-term efficient removal of formaldehyde.
LiXZhangHWeiJ, et al.Adsorptive nonwoven with multi-3-dimensional structure for the adsorption of VOCs. Microporous Mesoporous Mater2020; 303: 110–190.
2.
RongSLiKZhangP, et al.Potassium associated manganese vacancy in birnessite-type manganese dioxide for airborne formaldehyde oxidation. Catal Sci Technol2018; 8: 1799–1812.
3.
JiangCLiDZhangP, et al.Formaldehyde and volatile organic compound (VOC) emissions from particleboard: Identification of odorous compounds and effects of heat treatment. Build Environ2017; 117: 118–126.
4.
MiaoLWangJ, andZhangP.Review on manganese dioxide for catalytic oxidation of airborne formaldehyde. Appl Surf Sci2019; 466: 441–453.
5.
SingKSWEverettDHHaulRAW, et al.Reporting physisorption data for gas/solid systems with special reference to the determination of surface area and porosity (Recommendations 1984). Pure Appl Chem1985; 57: 603–619.
6.
FanXLiCZengG, et al.Removal of gas-phase element mercury by activated carbon fiber impregnated with CeO2. Energy Fuels2010; 24: 4250–4254.
7.
ZengYGuLFengY, et al.Morphologically uniform Pd/FexMn3−xO4-HP interfaces as the high-performance model catalysts for catalytic combustion of volatile organic compound. Appl Surf Sci2020; 528: 147006.
8.
AverlantRRoyerSGiraudonJM, et al.Mesoporous silica‐confined manganese oxide nanoparticles as highly efficient catalysts for the low‐temperature elimination of formaldehyde. ChemCatChem. 2014; 6: 152–161.
9.
WangJYunusRLiJ, et al.In situ synthesis of manganese oxides on polyester fiber for formaldehyde decomposition at room temperature. Appl Surf Sci2015; 357: 787–794.
10.
DimpeKMNomngongoPN.A review on the efficacy of the application of myriad carbonaceous materials for the removal of toxic trace elements in the environment. Trends Environ Anal Chem2017; 16: 24–31.
11.
KosimaningrumWELeTXHHoladeY, et al.Surfactant- and binder-free hierarchical platinum nanoarrays directly grown onto a carbon felt electrode for efficient electrocatalysis. ACS Appl Mater Interfaces2017; 9: 22476–22489.
12.
GopinathAKadirveluK.Strategies to design modified activated carbon fibers for the decontamination of water and air. Environ Chem Lett2018; 16: 1137–1168.
13.
MangunCLBenakKRDaleyMA, et al.Oxidation of activated carbon fibers: Effect on pore size, surface chemistry, and adsorption properties. Chem Mater1999; 11: 3476–3483.
14.
ZhangY, et al.In situ growth of MnO2 on PDA-templated cotton fabric for degradation of formaldehyde. Cellulose2022; 29(13): 7353–7363.
15.
LiuRLiangMXuJ, et al.Preparation of a novel formaldehyde-free impregnated decorative paper containing MnO2 nanoparticles for highly efficient formaldehyde removal. ACS Appl Mater Interfaces2023; 15: 34941–34955.
16.
ChenYPengLZengQ, et al.Removal of trace Cd(II) from water with the manganese oxides/ACF composite electrode. Clean Technol Environ Policy2015; 17: 49–57.
17.
LimSYoonSShimizuY, et al.Surface control of activated carbon fiber by growth of carbon nanofiber. Langmuir2004; 20: 5559–5563.
18.
QinHWuTDuC, et al.Self-assembled NaY/MnO2-based textiles for indoor formaldehyde removal at room temperature. Colloids Surf, A2021; 609: 125674.
19.
TangXWeiJKongZ, et al.Introduction of amino and rGO into PP nonwoven surface for removal of gaseous aromatic pollutants and particulate matter from air. Appl Surf Sci2020; 511: 145631.
20.
WangJLiJJiangC, et al.The effect of manganese vacancy in birnessite-type MnO2 on room-temperature oxidation of formaldehyde in air. Appl Catal, B2017; 204: 147–155.
21.
YinBZhangSJiangH, et al.Phase-controlled synthesis of polymorphic MnO2 structures for electrochemical energy storage. J Mater Chem A2015; 3: 5722–5729.
22.
DuanXYangJGaoH, et al.Controllable hydrothermal synthesis of manganese dioxide nanostructures: Shape evolution, growth mechanism and electrochemical properties. CrystEngComm2012; 14: 4196–4204.
23.
EgorovaAABushkovaTMKolesnikIV, et al.Selective synthesis of manganese dioxide polymorphs by the hydrothermal treatment of aqueous KMnO4 solutions. Russ J Inorg Chem2021; 66: 146–152.
24.
MosaIMBiswasSEl-SawyAM, et al.Tunable mesoporous manganese oxide for high performance oxygen reduction and evolution reactions. J Mater Chem A2016; 4: 620–631.
25.
WeiCXuCLiB, et al.Anomalous effect of K ion on crystallinity and capacitance of the manganese dioxide. J Power Sources2013; 225: 226–230.
26.
ZhaoWKZhengJYWangX, et al.Removal of formaldehyde by triboelectric charges enhanced MnOx-PI at room temperature. Appl Surf Sci2021; 541: 148430.
27.
ZhuLWangJRongS, et al.Cerium modified birnessite-type MnO2 for gaseous formaldehyde oxidation at low temperature. Appl Catal, B2017; 211: 212–221.
28.
WangMLiuHHuangZ, et al.Activated carbon fibers loaded with MnO2 for removing NO at room temperature. Chem Eng J2014; 256: 101–106.
29.
LongXTianLWangJ, et al.Interconnected δ-MnO2 nanosheets anchored on activated carbon cloth as flexible electrode for high-performance aqueous asymmetric supercapacitors. J Electroanal Chem2020; 877: 114–656.
30.
HouJLiuLLiY, et al.Tuning the K+ concentration in the tunnel of OMS-2 nanorods leads to a significant enhancement of the catalytic activity for benzene oxidation. Environ Sci Technol2013; 47: 13730–13736.
31.
HuangYYeKLiH, et al.A highly durable catalyst based on Cox Mn3−xO4 nanosheets for low-temperature formaldehyde oxidation. Nano Res2016; 9: 3881–3892.
32.
WangYLiuHWangS, et al.Simultaneous removal and oxidation of arsenic from water by δ-MnO2 modified activated carbon. J Environ Sci2020; 94: 147–60.
33.
LiuWDuanPHuX, et al.Fabrication of efficient nano-MnOx/ACF particle electrodes and their application in the electrooxidation of m-Cresol in the 3-D electrode system. Ind Eng Chem Res2019; 58: 22114–22123
34.
KimWVikrantKYounisSA, et al.Metal oxide/activated carbon composites for the reactive adsorption and catalytic oxidation of formaldehyde and toluene in air. J Cleaner Prod2023; 387: 135925.
35.
ZhengJYZhaoWKWangX, et al.Electric-enhanced hydrothermal synthesis of manganese dioxide for the synergistic catalytic of indoor low-concentration formaldehyde at room temperature. Chem Eng J2020; 401: 125790.
36.
VikrantKKimKDongF, et al.Low-temperature oxidative removal of gaseous formaldehyde by an eggshell waste supported silver-manganese dioxide bimetallic catalyst with ultralow noble metal content. J Hazard Mater2022; 434: 128857.
37.
YangSZhuZWeiF, et al.Enhancement of formaldehyde removal by activated carbon fiber via in situ growth of carbon nanotubes. Build Environ2017; 126: 27–33.
