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

Ma, Jie; Sun, Yiran; Yang, Jinhu; Lin, Zi-Han; Huang, Qingting; Ou, Tian; Yu, Fei

doi:10.4209/aaqr.2016.07.0312

Cited by 9 publications

(8 citation statements)

References 31 publications

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“…Ahmaruzzaman and Gupta 6 showed that the modification of rice husks could remove lignin and hemicellulose, reduce cellulose crystallinity, and increase the porosity or surface area. The SSA and pore volume results presented the same trend in our study, indicating that the microstructure and pore properties of rice straw benefited from the modification 27 . The Tiron-extractable Si contents were 41.2, 182.3, 168.5, and 20.1 g·kg −1 in Sp, Sa, Sb, and Ms, respectively, according to the analytical method of Guntzer et al .…”

Section: Resultssupporting

confidence: 84%

“…The adsorption of Cd(II) onto the adsorbent with a larger SSA was more sensitive to the temperature than that with a smaller SSA. A higher SSA of an adsorbent indicated more adsorption sites, contact area and surface functional groups 27 . Therefore, the adsorbent with a higher SSA was more susceptible to temperature change and thus the thermal motion of the molecule.…”

Section: Resultsmentioning

confidence: 99%

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Characterization and Interpretation of Cd (II) Adsorption by Different Modified Rice Straws under Contrasting Conditions

Wang

Yao

et al. 2019

Sci Rep

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Rice straw can adsorb Cd(II) from wastewater, and modification of rice straw may improve its adsorption efficiency. The rice straw powder (Sp) from the direct pulverization of rice straw was used as the control, the rice straw ash (Sa), biochar (Sa), and modified rice straw (Ms) were prepared by ashing, pyrolysis and citric acid modification, respectively, and all of them were examined as adsorbents for Cd(II) in this study. Batch adsorption experiments were adopted to systematically compare the adsorption capacities of rice straw materials prepared with different modification methods for Cd(II) from aqueous solution under different levels of initial Cd(II) concentration (0–800 mg·L−1), temperature (298, 308, and 318 K), contact time (0–1440 min), pH value (2–10), and ionic strength (0–0.6 mol·L−1). The results indicated that the modification method affected the adsorption of Cd(II) by changing the specific surface area (SSA), Si content, surface morphology, and O-containing functional group of rice straw. Compared with Sp, Ms held more surface O–H, aliphatic and aromatic groups, while Sa had more phenolic, C–O (or C–O–C), and Si–O groups, and Sb held more C–O (or C–O–C) and Si–O groups; besides, Sa, Sb, and Ms had larger SSA than Sp. Adsorption capacity of the four adsorbents for Cd(II) increased and gradually became saturated with the increase in the initial Cd(II) concentration (0–800 mg·L−1). The adsorption capacity of Cd(II) was significantly higher at 318 K than 298 K and 308 K, regardless of the adsorbent type. Sa had the largest SSA (192.38 m2·g−1) and the largest adsorption capacity for Cd(II). When the initial Cd2+ concentration was at 800 mg·L−1, the Cd(II) adsorption amount reached as high as 68.7 mg·g−1 with Sa at 318 K. However, the SSA of Sp was only 1.83 m2·g−1, and it had the least adsorption capacity for Cd(II). Only the adsorption of Cd(II) upon Sb at 298 K was spontaneous, and surprisingly, all other adsorptions were nonspontaneous. These adsorptions were all chemical, and were favorable, exothermic and order-increasing processes. The pseudo-second-order model showed a strong fit to the kinetics of Cd(II) adsorption by the four adsorbents. The adsorption capacities of Cd(II) by the adsorbents were less at low pH, and all were enhanced with the increase of initial pH value (2–10) in the solution. The inhibiting effect on Cd(II) adsorption due to the increase in ionic strength was greater with Sa, Sb, and Ms than that under Sp. The rice straw ash prepared by ashing unexpectedly had greater adsorption capacity for Cd(II) than the biochar and citric acid modified rice straw. The optimum condition for Cd(II) adsorption was established as the temperature of 318 K, initial Cd(II) concentration of 800 mg·L−1, contact time of 240 min, and no Na(I) interference regardless of absorbent. In conclusion, rice straw ash shows the greatest potential of being applied to paddy fields for the remediation of Cd(II) pollution so as to reduce the risk of Cd(II) enrichment in rice grains and straws.

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Section: Resultssupporting

confidence: 84%

Section: Resultsmentioning

confidence: 99%

Characterization and Interpretation of Cd (II) Adsorption by Different Modified Rice Straws under Contrasting Conditions

Wang

Yao

et al. 2019

Sci Rep

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“…Another factor that can enhance the formaldehyde absorption is the surface properties of hBN. Hydrogen bonding between formaldehyde and hydroxyl or amine groups is very crucial in the absorption of formaldehyde 49 , 50 , while the formaldehyde molecules and hBN layers show both planar configuration, resulting in lower adsorption resistance 46 . Finally, formaldehyde has π-bonding between C and O atoms, while hBN also shows large 2D delocalized π-bonded structure.…”

Section: Resultsmentioning

confidence: 99%

Multi-functional 2D hybrid aerogels for gas absorption applications

Androulidakis

Kotsidi

Gorgolis

et al. 2021

Sci Rep

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Aerogels have attracted significant attention recently due to their ultra-light weight porous structure, mechanical robustness, high electrical conductivity, facile scalability and their use as gas and oil absorbers. Herein, we examine the multi-functional properties of hybrid aerogels consisting of reduced graphene oxide (rGO) integrated with hexagonal boron nitride (hBN) platelets. Using a freeze-drying approach, hybrid aerogels are fabricated by simple mixing with various volume fractions of hBN and rGO up to 0.5/0.5 ratio. The fabrication method is simple, cost effective, scalable and can be extended to other 2D materials combinations. The hybrid rGO/hBN aerogels (HAs) are mechanically robust and highly compressible with mechanical properties similar to those of the pure rGO aerogel. We show that the presence of hBN in the HAs enhances the gas absorption capacities of formaldehyde and water vapour up to ~ 7 and > 8 times, respectively, as compared to pure rGO aerogel. Moreover, the samples show good recoverability, making them highly efficient materials for gas absorption applications and for the protection of artefacts such as paintings in storage facilities. Finally, even in the presence of large quantity of insulating hBN, the HAs are electrically conductive, extending the potential application spectrum of the proposed hybrids to the field of electro-thermal actuators. The work proposed here paves the way for the design and production of novel 2D materials combinations with tailored multi-functionalities suited for a large variety of modern applications.

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“…Nevertheless, FA adsorption capacity of neat GA is less than expectations due to stacking of graphene nanosheets, while relevant modified studies are limitedly published in recent years. For instance, Jie Ma [16] et al manufactured composite GAs by direct additions of CNT into GO solution with 18 mg g -1 FA adsorption capacity. Lirui Wu [17] et al prepared ethylenediamine-modified graphene sponge with enhanced FA adsorption capacity of 22.8 mg g -1 , and amine groups of ethylenediamine was essential for improvement of FA removal.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Self‐Assembled Construction of Robust and Super Elastic Graphene Aerogel for High‐Efficient Formaldehyde Removal and Multifunctional Application

Wang

Zhao

2023

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Simultaneously achieving exceptional mechanical strength and resilience of graphene aerogel (GA) remains a challenge, while GA is an ideal candidate for formaldehyde removal. Herein, flexible polyethyleneimine (PEI) is grafted chemically onto carbon nanotube (CNT) surface, and CNT‐PEI@reduced GA (rGA) is fabricated via hydrothermal self‐assembly, pre‐frozen, and hydrazine reduction process. Introducing CNT‐PEI contributes to well‐interconnected/robust 3D network construction by connecting reduced graphene oxide (rGO) nanosheets through enhancing cross‐linking, while entangled CNT‐PEI is intercalated into rGO layers to avoid serious restacking of sheets, producing larger surface area and more formaldehyde adsorption sites. Ultralight CNT‐PEI@rGA exhibits extreme high strength (276.37 kPa), reversible compressibility at 90% strain, and structural stability, while FA adsorption capacity reached 568.41 mg g‐1, ≈3.28 times of rGA, derivable from synergistic chemical‐physical adsorption effect. Furthermore, CNT‐PEI@rGA is ground into powder for first preparing polyoxymethylene (POM)/CNT‐PEI@rGA composite, while formaldehyde emission amount is 69.63%/73.96% lower than that of POM at 60/230 °C. Moreover, CNT‐PEI@rGA presents outstanding piezoresistive‐sensing and thermal insulation properties, exhibiting high strain sensitivity, wide strain detection range, and long‐term durability.

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

Cited by 9 publications

References 31 publications

Characterization and Interpretation of Cd (II) Adsorption by Different Modified Rice Straws under Contrasting Conditions

Characterization and Interpretation of Cd (II) Adsorption by Different Modified Rice Straws under Contrasting Conditions

Multi-functional 2D hybrid aerogels for gas absorption applications

Self‐Assembled Construction of Robust and Super Elastic Graphene Aerogel for High‐Efficient Formaldehyde Removal and Multifunctional Application

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