Effective removal of Cr(VI) from aqueous solution by 3-aminopropyltriethoxysilane-functionalized graphene oxide

He, Chao; Yang, Zhiquan; Ding, Jie; Chen, Yuancai; Tong, Xiaowen; Li, Ying

doi:10.1016/j.colsurfa.2017.01.086

Cited by 71 publications

(28 citation statements)

References 51 publications

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“…After shaking for a predetermined time, the solidliquid phases were separated by external magnetic force, followed by filtration using 0.42 µm cellulose nitrate membrane filters. The concentration of Cr(VI) in the liquid phase was measured by 1,5-diphenylcarbohydrazide method using UV-Visible spectrophotometer in the maximum absorbance wavelength of 540 nm [21,40,41]. The concentration of AB 1 dye in the liquid phase was measured by using UV-Visible spectrophotometer in the maximum absorbance wavelength of 620 nm.…”

Section: Synthesis Of Amino-functionalized Sio 2 @Cofe 2 O 4 Onto Go mentioning

confidence: 99%

“…Among the various adsorbents, graphene oxide (GO) is one of the derivative of carbon family, which can be easily synthesized from the natural graphite using modified hummer's method. Graphene oxide contains more oxygen groups (such as -OH, -COOH, -O-and C=O) and has abundant other functional groups [21], which help for higher adsorption of organic and inorganic pollutants [22][23][24][25], due to increased number of active sites on their surface [26]. Hence, more research is focused on using GO and their composites towards the removal of various pollutants [27,28].…”

Section: Introductionmentioning

confidence: 99%

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Magnetic SiO 2 @CoFe 2 O 4 nanoparticles decorated on graphene oxide as efficient adsorbents for the removal of anionic pollutants from water

Santhosh

Daneshvar

Kollu

et al. 2017

Chemical Engineering Journal

107

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In this study, magnetic nanocomposites viz. SiO 2 @CoFe 2 O 4 nanoparticles decorated on graphene oxide were synthesized using solvothermal and sol-gel processes. The prepared nanocomposite materials were used as magnetic adsorbents for the removal of organic and inorganic pollutants (acid black 1 dye and Cr(VI) ions as model pollutants) from aqueous solution. The structure, morphology and other physico-chemical properties of nanocomposites were characterized by X-ray diffraction (XRD), field emission-scanning electron microscopy (FE-SEM), high resolutiontransmission electron microscopy (HR-TEM), vibrating sample magnetometer (VSM), X-ray Photo spectroscopy (XPS), zeta potential and Fourier infrared (FT-IR) spectroscopy. Batch mode adsorption studies were conducted with the prepared nanocomposites to determine the maximum adsorption capacity of acid black 1 dye and Cr(VI) ions as a function of contact time, pH, adsorbent dosage and initial adsorbate concentrations. Different kinetic and isotherm models were tested to describe and elucidate the adsorption mechanisms. Based on the experimental results obtained, the synthesized materials proved to exhibit considerable potential for the removal of acid black 1 and Cr(VI) ions from aqueous solution.

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Section: Synthesis Of Amino-functionalized Sio 2 @Cofe 2 O 4 Onto Go mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Magnetic SiO 2 @CoFe 2 O 4 nanoparticles decorated on graphene oxide as efficient adsorbents for the removal of anionic pollutants from water

Santhosh

Daneshvar

Kollu

et al. 2017

Chemical Engineering Journal

107

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“…The improvement of their selectivity can be realized by application of surfactant [ 15 – 17 ], suitable chelating agent [ 18 , 19 ], or through chemical functionalization, e.g. via silanization [ 20 – 22 ] or creation of ester or amide bonds [ 23 , 24 ]. In case of Cr(VI), the amino-functionalized GO seems to be the appropriate adsorbent because the protonated amino groups provide a positive surface charge that is suitable for the adsorption of Cr(VI) anions [ 25 ].…”

Section: Introductionmentioning

confidence: 99%

Selective adsorption and determination of hexavalent chromium ions using graphene oxide modified with amino silanes

et al. 2018

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Novel adsorbents are described for the preconcentration of chromium(VI). Graphene oxide (GO) was modified with various amino silanes containing one, two, or three nitrogen atoms in the molecule. These include 3-aminopropyltriethoxysilane (APTES), N-(3-trimethoxysilylpropyl)ethylenediamine (TMSPEDA), and N1-(3-trimethoxysilylpropyl)diethylenetriamine (TMSPDETA). The resulting GO derivatives were characterized by scanning electron microscopy, X-ray photoelectron spectroscopy, and energy-dispersive X-ray fluorescence spectrometry (EDXRF). Adsorption studies show that these GO based sorbents are highly selective for Cr(VI) in the presence of Cr(III) at pH 3.5. Although the amino silanes applied in modification of GO contain different numbers of nitrogen atoms, the maximum adsorption capacities of GO derivatives are very similar (13.3–15.1 mg·g−1). Such results are in accordance with spectroscopy studies which show that the amount of amino silanes attached to GO decreases in the order of APTES > TMSPEDA > TMSPDETA. The APTES-modified GO was applied to selective and sensitive extraction of Cr(VI) ions prior to quantitation by low-power EDXRF using the Cr Kα line. The Cr(VI) ions need not be eluted from the solid adsorbent. The method has a 0.17 ng·mL−1 detection limit, and the recovery is 99.7 ± 2.2% at a spiking level of 10 ng·mL−1. The method was successfully applied to the determination of Cr(VI) in water samples. Graphical abstractGraphene oxide adsorbents modified with various amino silanes are described for the preconcentration and speciation of trace and ultratrace levels of chromium ions. Electronic supplementary materialThe online version of this article (10.1007/s00604-017-2640-2) contains supplementary material, which is available to authorized users.

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“…Among these, different industries release several toxic contaminants such as heavy metals, organic dyes, pharmaceuticals, petroleum products, and others into water bodies [7][8][9]. Owing to their noxiousness and bioaccumulation, they provide enormous hazards to living things [10][11][12]. Among these pollutants, the contamination of water with heavy metals is a severe cause of environmental and human health problems [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of Functionalized Cellulose Nanomaterials (CNMs) for Pb(II) Ions Removal from Wastewater

Tsade

Anshebo

Sabir

2021

Journal of Chemistry

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Due to their remarkable properties, cellulose nanomaterials are emerging materials for wastewater (WW) treatment. In this study, both pristine cellulose nanomaterial (CNM) and sodium periodate modified cellulose nanomaterial (NaIO4-CNM) were prepared from the stem of the Erythrina brucei plant for the removal of Pb(II) ions from WW. As-prepared CNMs were characterized by X-ray diffraction (XRD), Fourier transform infrared (FT-IR), scanning electron microscope (SEM), and thermogravimetric analysis with differential thermogravimetry (TGA-DTG) analysis. The as-prepared and characterized CNMs were tested for the removal of Pb(II) ions from secondary run-off wastewater (SERWW). Langmuir and Freundlich adsorption isotherms were certainly fixed to a maximum Pb(II) ions uptake capability (Qmax) of 91.74 and 384.62 mg g−1 by CNM and NaIO4-CNM adsorbents, respectively. The pseudo-second-order (PSO) kinetics model was well fitted to the uptake process. Results revealed that the percentage removal (%R) of Pb(II) ions was decreased by the presence of nitrogen and organic matter, but not affected by the presence of phosphorous in SERWW. Due to its high efficiency, NaIO4-CNM was selected for the regeneration study. The regeneration study was conducted after desorption of Pb(II) ions from the adsorbent by the addition of HCl, and the regenerated sorbent was reused as an adsorbent for at least 13 successive cycles. The results indicated excellent recycling capabilities, and the adsorbent was used as adsorbing material for the removal of Pb(II) ions from SERWW after 13 successive cycles without significant efficient loss.

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Effective removal of Cr(VI) from aqueous solution by 3-aminopropyltriethoxysilane-functionalized graphene oxide

Cited by 71 publications

References 51 publications

Magnetic SiO 2 @CoFe 2 O 4 nanoparticles decorated on graphene oxide as efficient adsorbents for the removal of anionic pollutants from water

Magnetic SiO 2 @CoFe 2 O 4 nanoparticles decorated on graphene oxide as efficient adsorbents for the removal of anionic pollutants from water

Selective adsorption and determination of hexavalent chromium ions using graphene oxide modified with amino silanes

Preparation and Characterization of Functionalized Cellulose Nanomaterials (CNMs) for Pb(II) Ions Removal from Wastewater

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