Removal of antimony(III) from aqueous solution by graphene as an adsorbent

Leng, Yanqiu; Guo, Weilin; Su, Shengnan; Yi, Chunliang; Xing, Lu

doi:10.1016/j.cej.2012.09.078

Cited by 175 publications

(79 citation statements)

References 25 publications

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“…It serves as a suitable adsorbent for the sequestration and removal of pollutants from water. Graphene, graphene oxide and their functionalized preparations exhibit exciting adsorption abilities for removing hazardous anions, heavy metals, including Sb(III), Cr(VI), Cu(II), Pb(II), Hg(II), Cd(II), Ni(II), and cationic dyes such as methylene blue (MB) and safranine T (ST) from contaminated water [14][15][16][17]. Incorporating active components with GO to synthesize new nanocomposites with high adsorption abilities for hazardous anion removal has drawn wide attention [8,18].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of graphene oxide/schwertmannite nanocomposites and their application in Sb(V) adsorption from water

Dong

Dou

Mohan

et al. 2015

Chemical Engineering Journal

102

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h i g h l i g h t sGraphene oxide and schwertmannite were combined into nanocomposites. A synergistic effect on Sb(V) uptake was observed for the composite adsorbent. The schwertmannite component is the main active phase in the composite for Sb(V) uptake. The surface groups of graphene oxide also contributed to Sb(V) adsorption. Schwertmannite was incorporated onto graphene oxide to form nanocomposites (GO-SCH) to serve as an adsorbent for Sb(V) removal. A synergistic effect on Sb(V) uptake was observed for the composite adsorbent. A maximum Sb(V) adsorption capacity of 158.6 mg Sb(V)/g of GO-SCH at an equilibrium Sb(V) concentration of 8.0 mg/L at pH 7.0 was obtained. This capacity is superior to either GO or SCH alone. The effect of contact time, solution pH and co-existing competitive anions on Sb(V) uptake by GO-SCH was evaluated. External mass transfer governed the Sb(V) uptake kinetics within 1 h. After 1 h, intraparticle diffusion gradually became predominant. Common co-existing anions at their natural environmental concentrations had little effect on the performance of GO-SCH. Sb(V) in spiked tap water (100 lg/L), simulated river water (6400 lg/L), and acid mine drainage (50,000 lg/L) was adsorbed by GO-SCH to well below the regulation levels for these waters. XRD and SEM analyses showed that SCH was well incorporated among GO platelets and highly dispersed on the GO carrier's surface. FTIR and Raman spectra showed that both SCH and GO surfaces in the composites contribute to Sb(V) removal and SCH was the main active phase. This was also confirmed by XPS Fe 2p spectra. Sb 3d 3/2 XPS spectra indicated that no surface precipitation or reduction of Sb(V) to Sb(III) occurred. Deconvolution of C 1s XPS spectra and Boehm titration indicated the surface carboxyl, lactonic and phenolic hydroxyl groups of GO also contribute to Sb(V) removal. The outstanding Sb(V) uptake ability of GO-SCH suggests it is a promising adsorbent for antimony removal from contaminated water.

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Section: Introductionmentioning

confidence: 99%

Synthesis of graphene oxide/schwertmannite nanocomposites and their application in Sb(V) adsorption from water

Dong

Dou

Mohan

et al. 2015

Chemical Engineering Journal

102

View full text Add to dashboard Cite

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“…The possibility of the removal of Sb(III) using graphene as adsorbent from aqueous solutions has been explored [26]. Batch adsorption experiments were performed to investigate the influence of operating parameters such as solution pH, initial Sb(III) concentration, temperature and contact time on the adsorption process.…”

Section: Removal Of Metallic Ionsmentioning

confidence: 99%

“…The adsorption kinetic data best fitted into the pseudo-second-order model and the model suitably interpret the overall adsorption process, demonstrating that the rate determining step is chemisorption. The Sb(III) loaded graphene could be regenerated, using 0.1 mol L −1 ethylenediaminetetraacetic acid disodium salt as a desorbing agent [26].…”

Section: Removal Of Metallic Ionsmentioning

confidence: 99%

Carbon Nanomaterials for Environmental Applications

Machado

Lima

Jauris

et al. 2015

Carbon Nanostructures

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The qualities of waters are constantly diminishing due to release of toxic components into the environment. It is very important to treat wastewater in order to remove pollutants and improve water quality. Generally, adsorption technology has proven to be one of the most effective techniques in the separation and removal of a wide variety of organic and inorganic pollutants from wastewater. Recently, carbon nanomaterials such as fullerene, carbon nanotubes (CNT) and graphene-family have become promising adsorbents for water treatment. This chapter compiles relevant knowledge about the experimental and theoretical adsorption activities of fullerene, CNT and graphene-family as nanoadsorbents for removal of organic and inorganic environmental pollutants.

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“…The morphology and SSA did not show apparent differences although the adsorption capacity against Pb 2+ is enhanced obviously after heat treatment, and the enhanced adsorption capacity was ascribed to the increase in the Lewis basicity and electrostatic attraction of graphene. Recently, RGO obtained by a modified Hummers ' method has an adsorption capacity of 8.0610 −3 g g −1 for antimony (III) Sb 3+ [12]. In order to overcome the hydrophobicity of graphene, which limits the capacity of removing heavy metal ions in wastewater to some extent, a stable and water-dispersible GNS was prepared by a one-step route [13].…”

Section: Adsorption and Reduction For Heavy Metal Ionsmentioning

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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Removal of antimony(III) from aqueous solution by graphene as an adsorbent

Cited by 175 publications

References 25 publications

Synthesis of graphene oxide/schwertmannite nanocomposites and their application in Sb(V) adsorption from water

Synthesis of graphene oxide/schwertmannite nanocomposites and their application in Sb(V) adsorption from water

Carbon Nanomaterials for Environmental Applications

Applications of graphene-based materials in environmental protection and detection

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