Chemical reduction and removal of Cr(vi) from acidic aqueous solution by ethylenediamine-reduced graphene oxide

Ma, Hongchao; Zhang, Youwei; Hu, Qi-Hui; Yan, Dong; Yu, Zhong‐Zhen; Zhai, Maolin

doi:10.1039/c2jm00145d

Cited by 284 publications

(161 citation statements)

References 26 publications

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“…4. G1N0 (VC) has been identified with the following functional groups: the strong peak at approximately 3400 cm -1 is attributed to the stretching vibration of -OH (Davis et al, 1999), the peak at 1618 cm -1 corresponds to the stretching vibration of the benzene ring C=C (Daifullah and Girgis, 2003;Ma et al, 2012), and the peaks at 918 and 1198 cm -1 correspond to the stretching vibrations of the alkoxy C-O and C-OH bonds, respectively (Gu et al, 2015). The IR spectrum of G1N0 shows a similar intensity for the -OH peak at approximately 3400 cm -1 when compared to the spectrum of G1N0 (VC), which indicates that GO has been reduced to a similar degree by VC and EDA.…”

Section: Characterization Of Graphene Aerogel Adsorbentsmentioning

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: Characterization Of Graphene Aerogel Adsorbentsmentioning

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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“…Figure 2a shows the FT-IR spectrum of the GO which was prepared using the Hummers' modified method. A peak at 1621 cm -1 can be assigned either to the C=C stretching band [30] or to the deformation of water molecules [31], while the absorption band between 1720 and 1736 cm -1 corresponds to the carboxylic and carbonyl groups [32][33][34]. Moreover, the absorption peaks at 1382-856 cm -1 are attributed to the epoxy and alkoxy groups [35][36][37][38][39].…”

Section: Results and Discussion Characterizationmentioning

confidence: 96%

Enhanced photocatalytic degradation of a phenolic compounds’ mixture using a highly efficient TiO2/reduced graphene oxide nanocomposite

et al. 2016

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A nanocomposite (namely rGOTi) was prepared by loading 0.33 weight percent of reduced graphene oxide (rGO) on commercial TiO 2 nanoparticles using a hydrothermal method. The as-prepared nanocomposite was characterized using surface and bulk analytical techniques such as X-ray photoelectron spectroscopy, X-ray diffraction, and Fourier transform infrared and Raman spectroscopies. Also, the surface area was measured using the Brunauer-EmmettTeller technique. In addition, the UV-Vis diffuse reflectance spectroscopy measurements have shown that the band gap energy for TiO 2 was lowered from 3.11 to 2.96 eV when it was composited with rGO to form the rGOTi. The kinetics of the degradation of phenol, p-chlorophenol, and p-nitrophenol (separate or mixed) and their intermediates using the as-prepared nanocomposite photocatalyst compared to the bare TiO 2 nanoparticles was tested using UV and Xenon lamps (mainly a visible light source) as photoexcitation sources in the presence and absence of H 2 O 2 . In general, it was revealed that the photocatalytic activity of the rGOTi using a visible light source, in the presence of H 2 O 2 , is significantly higher than that when (1) a UV lamp and/or (2) TiO 2 nanoparticles were used. Also, the presence of H 2 O 2 led to higher degradation rates of all the phenolic compounds regardless the type of photoexcitation source.

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“…Ethylene diamine tetraacetic acid-GO can remove Pb 2+ with an adsorption capacity of 0.479 g g −1 [32]. Cr (VI) can be also reduced and removed by ethylenediamine-RGO [33].…”

Section: −1mentioning

confidence: 99%

Applications of graphene-based materials in environmental protection and detection

Yang

et al. 2013

Chin. Sci. Bull.

100

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Many efficient adsorbents and sensors based on graphene and functionalized graphene have been constructed for the removal and detection of environmental pollutants due to its unique physicochemical properties. In this article, recent research achievements are reviewed on the application of graphene-based materials in the environmental protection and detection. For environmental protection, modified graphene can adsorb heavy metal ions in a high efficiency and selectivity, and thus reduces them to metals for recycling. High adsorption capacity of graphene-based materials to kinds of organic pollutants in water was also presented. Several graphene-based sensors with high limit of detection were reported to detect heavy metal ions, toxic gases and organic pollutants in environment. Finally, a perspective on the future challenge of adsorbents and detection devices based on graphene is given. Environmental pollution especially toxic gases, heavy metal ions and organic pollutants in air and water, caused by industry and agricultural activities, severely threaten ecological balance and human health, and have received extensive attention worldwide. For example, the heavy metal ions in bodies accumulated from the food chains will cause various chronic diseases. Therefore, it is necessary to develop simple, sensitive and inexpensive methods to remove and detect these pollutants. Currently, many efficient adsorbents and sensitive detection devices based on nanomaterials especially graphene have been designed due to their unique chemical, thermal, electronic, and mechanical properties. Graphene, a two-dimensional (2D) one atom thick nanomaterial consisting of sp 2 -hybridized carbon, has attracted great interest among scientists due to its unique properties, including high specific surface area (SSA) of 2600 m 2 g −1 [1], excellent thermal conductivities of 5000 W mhigh-speed electron mobility of 200000 cm 2 V −1 s −1 at room temperature [3], high stiffness and strength with Young's modulus of around 1000 GPa and break strength of 130 GPa [4], extraordinary electrocatalytic activity [5] and optical properties [6]. These outstanding physicochemical properties indicate its potential application in many research fields. For example, considering the high surface area and strong adsorption capacity of graphene, many efficient adsorbents [7] and photocatalysts [8] are developed for the removal and photocatalytic degradation of pollutants. Moreover, based on the excellent electrical conductivity and optical properties of graphene, many sensitive electrochemical [9] and fluorescent [10] sensors are also designed for the detection of pollutants. However, aggregations of graphene decrease its available surface area and further reduce its adsorption capacity. Functionalization of graphene with molecules, which have water-solubility and affinity toward target analytes, will improve the selectivity of adsorbents or detection devices, as well as prevent the aggregation. Based on this

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Chemical reduction and removal of Cr(vi) from acidic aqueous solution by ethylenediamine-reduced graphene oxide

Cited by 284 publications

References 26 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

Enhanced photocatalytic degradation of a phenolic compounds’ mixture using a highly efficient TiO2/reduced graphene oxide nanocomposite

Applications of graphene-based materials in environmental protection and detection

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