Facile Synthesis of 3D Amino-Functional Graphene-Sponge Composites Decorated by Graphene Nanodots with Enhanced Removal of Indoor Formaldehyde

Wu, Ling; Zhang, Lanxin; Meng, Tao; Yu, Fei; Chen, Junhong; Ma, Jie

doi:10.4209/aaqr.2014.10.0237

Cited by 21 publications

(12 citation statements)

References 25 publications

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“…These features make graphene a promising material for the application of adsorption of formaldehyde. In a previous study, we studied the formaldehyde removal ability of amino-functional graphene-sponge composites decorated by graphene nanodots and achieved a breakthrough time of approximately 2,137 min g -1 , presenting a significant improvement in adsorption performance (Wu et al, 2015). CNTs have also been widely used for the removal of gaseous and water pollutants (Di et al, 2004;Agnihotri et al, 2005;Yu et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

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

Sun

Yang

et al. 2017

Aerosol Air Qual. Res.

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A flexible approach prepares amino-functional graphene aerogels with different additions of carbon nanotubes (CNTs) for use as an adsorbent to study the adsorption performance of formaldehyde in indoor air. Experimental results indicated that the decoration of amino groups offers a greater number of chemical adsorption sites, which mainly contributed to the improvement of the chemical adsorption capacity of graphene aerogels, and the breakthrough time increased from 0 to 390 min g -1 under 3.7 ppm of formaldehyde. The addition of CNTs can significantly enhance the adsorption properties. More interestingly, the breakthrough time presents a substantial increase from 390 to 20,300 min g -1 when the mass ratio of CNTs and graphene increased from 0:1 to 2:1 and then decreased to 18,000 min g -1 at the ratio of 3:1. The addition of CNTs weakens the agglomeration degree and achieves a greater number of adsorption sites by playing a supportive and connective role among graphene sheets. However, more CNTs will agglomerate, and fewer functional groups on the surface limit additional amounts. The adsorption mechanism was also studied by analyzing the surface specific area and N content. This work provides new insights into the application of amino-functional graphene aerogels with the additions of CNTs (AGCAs) as a potential adsorbent to eliminate indoor formaldehyde pollution.

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Section: Introductionmentioning

confidence: 99%

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

Sun

Yang

et al. 2017

Aerosol Air Qual. Res.

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“…The sharp adsorption at 1616 cm À1 is attributed to the vibration of -COOH [18]. The characteristic of GO nanosheets shows apparent bands at 3273, 1721, 1616, and 1039 cm À1 , assigned to O-H, C¼O, C¼C in aromatic ring of the hexagonal network and epoxide group C-O-C, respectively [20]. The characteristic of GO nanosheets shows apparent bands at 3273, 1721, 1616, and 1039 cm À1 , assigned to O-H, C¼O, C¼C in aromatic ring of the hexagonal network and epoxide group C-O-C, respectively [20].…”

Section: Characterization Of Graphene Oxide and Graphene Oxide Spongementioning

confidence: 98%

Uranium uptake with graphene oxide sponge prepared by facile EDTA-assisted hydrothermal process

Liu

Zhang

Dao-feng

et al. 2016

Int. J. Energy Res.

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Summary Seeking highly efficient and low‐cost sorbents to removal uranium contaminants is of great concern in demand. In present work, a graphene oxide sponge (GOS) was successfully assembled by a facile Ethylenediaminetetraacetic acid (EDTA)‐assisted hydrothermal method from graphene oxide (GO) sheets. The prepared GOS was characterized, and the influencing factors on uranium sorption were optimized. Results indicate that the GOS shows a spongy porous structure and significantly enhances the U(VI) removal compared with the pristine GO. Langmuir model well describes the equilibrium sorption data. Under experimental conditions, the maximal uranium sorption calculated from Langmuir model was found to be 212.77 mg · L−1. Sorption kinetics data are matched with pseudo‐second‐order model. Reusability experiments indicate that the prepared GOS can be regenerated using dilute acid treatment and be used repeatedly. The simple and low‐cost preparation of GOS predicts the potential applications of spongy GO as an effective sorbent for U(VI) capture and also expands the possibility of using graphene‐based sorbent in the disposal of liquid radioactive waste. Copyright © 2016 John Wiley & Sons, Ltd.

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“…10,[37][38][39][40][41][42][43] To the best of our knowledge, 2D titanate nanosheets or their assemblies have not been studied as HCHO adsorbents up to now. In this unique onepot synthesis protocol, a typical organic amine (diethylenetriamine, DETA) instead of traditional inorganic base is selected to mediate the overall synthesis processes.…”

Section: Introductionmentioning

confidence: 99%

Efficient removal of gaseous formaldehyde in air using hierarchical titanate nanospheres with in situ amine functionalization

Chen

Liu

2016

Phys. Chem. Chem. Phys.

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Removing formaldehyde (HCHO) in air by efficient and recyclable adsorbents is crucial for improving indoor air quality. Nanosized adsorbents with a higher surface area and abundant functional groups are highly desirable. In this report, hierarchical titanate nanospheres (HTS) were prepared as effective adsorbents by the diethylenetriamine (DETA) mediated one-pot solvothermal process. Typically, the HTS adsorbents were assembled by titanate nanosheets with abundant in situ grafted amine groups. Impressively, because of their hierarchical assembled structure, considerable specific surface area and pore volume, and abundant surface amine groups, the optimized HTS adsorbents exhibited excellent HCHO adsorption properties, with nearly 100% removal efficiency for HCHO in air at room temperature. Moreover, the recyclability of optimized HTS adsorbents is considerable, with only a very slight decrease in removal efficiency after 6 cycles. The DETA introduced into the synthesis system is crucial for both chemical and textural modifications of HTS adsorbents. Specifically, the DETA mediator not only affects significantly the phase, morphology, and textural properties of the obtained titanate products, but also induces in situ grafted surface amine groups. As a consequence, the adsorption capacity and recyclability of HTS adsorbents can be largely modified by adding different amounts of DETA to the synthesis system.

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Facile Synthesis of 3D Amino-Functional Graphene-Sponge Composites Decorated by Graphene Nanodots with Enhanced Removal of Indoor Formaldehyde

Cited by 21 publications

References 25 publications

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

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

Uranium uptake with graphene oxide sponge prepared by facile EDTA-assisted hydrothermal process

Efficient removal of gaseous formaldehyde in air using hierarchical titanate nanospheres with in situ amine functionalization

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