Comparison of Pb(II) adsorption onto graphene oxide prepared from natural graphites: Diagramming the Pb(II) adsorption sites

Peng, Weijun; Li, Hongqiang; Liu, Yanyan; Song, Shaoxian

doi:10.1016/j.apsusc.2015.12.208

Cited by 121 publications

(41 citation statements)

References 36 publications

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“…As demonstrated by many studies, the activation of these components was dependent on the solution pH. For example, carboxyl groups become deprotonated when the solution pH was above 3.7, these groups would be dissociated to provide more active sites for heavy metal adsorption 4, 5, 44 . In addition, SiO 2 component is negatively charged until the pH is increased to 4.5 13, 45 , but it can also contribute to the adsorption of heavy metals when the pH is above 4.5.…”

Section: Resultsmentioning

confidence: 99%

Lead adsorption by biochar under the elevated competition of cadmium and aluminum

Han

Qian

Rong-qin

et al. 2017

Sci Rep

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Competitive adsorption studies are important to accurately estimate the lead adsorption capacity on biochar in soil. The structure of biochars was evaluated by Fourier-Transform Infrared Spectroscopy and X-ray Diffraction, and the competitive of Cadmium (Cd) and Aluminum (Al) with Lead (Pb) adsorption were determined by kinetic experiments and pH effects. Adsorption kinetics indicated that the adsorption amount (mg g−1) of Pb by biochar was in the decreasing order of CM400 (90.9) > BB600 (56.5) > CM100 (29.2), the presence of the oxygen-containing functional groups, Si-containing mineral, PO4 3− and CO3 2− significantly contributed to Pb adsorption by biochars. With the presence of Cd, Pb adsorption amount was reduced by 42.6%, 23.7% and 19.3% for CM100, CM400 and BB600, respectively. The Si-containing mineral, PO4 3− and CO3 2− that were rich in CM400 and BB600 has led to less competition by Cd. In addition, Al showed a strong competition with Pb leading to the adsorption being reduced by 95.8%, 82.3% and 80.6%, respectively for CM100, CM400 and BB600. This was mainly attributed to the additional acidification effect by Al resulting in a counteractive of biochar’s liming effect. Results from this study are important for accurately estimating the heavy metal adsorption by biochar in soil.

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Section: Resultsmentioning

confidence: 99%

Lead adsorption by biochar under the elevated competition of cadmium and aluminum

Han

Qian

Rong-qin

et al. 2017

Sci Rep

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“…The peak in the spectrum of GO‐Zn(II) appeared at 3193/cm associated with the stretching vibration of water molecules disappeared. Moreover, shifts of the peaks were significantly observed, such as O‐H stretching vibration (3415–3408/cm), C = O stretching vibration (1704–1712/cm), tertiary C‐OH groups deformation vibration (1400–1383/cm) and C‐O stretching vibration (1096–1040/cm) upon the adsorption of Zn(II), indicating that the oxygenous functional groups (such as O − H, C = O, C − OH, and C − O) were participated in the Zn(II) adsorption . Referred to other heavy metal ions binding to the oxygenous functional groups reported elsewhere, the adsorption of Zn(II) might be represented in the following reaction:

- COOH + normalZ n^{2 prefix+} \to - COOZ n^{+} + H^{+}

- 2 normalO normalH + normalZ n^{2 prefix+} \to - OZnO - prefix+ 2 H^{+}

…”

Section: Resultsmentioning

confidence: 99%

“…It contained numerous of oxygenous functional groups, such as hydroxyl and carboxyl on the edges of sheets and epoxide and carbonyl on the planes . GO has confirmed to be a potential adsorbent for various contaminants because of its large theoretical surface area, surface hydrophobic π‐π interaction, hydrophilicity, high negative charge density and can be easily obtained . Amorphous graphite (AG) is a type of natural graphite with abundant reserve.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of Zn(II) on graphene oxide prepared from low‐purity of amorphous graphite

Yang

Peng

et al. 2016

Surface & Interface Analysis

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The adsorption of Zn(II) in aqueous solutions on graphene oxide (GO) prepared from low‐purity of natural amorphous graphite has been studied in this work. The study was performed through the measurements of Zeta potential, atomic force microscope, Fourier transform infrared spectrum and X‐ray photoelectron spectroscopy. The results indicated that the adsorption followed the Langmuir model with the maximum Zn(II) adsorption capacity of 73 mg/g at pH 7.0. In addition, the adsorption was well described by the pseudo‐second‐order kinetics model. The mechanism of the Zn(II) adsorption on GO was mainly attributed to chemical adsorption through complexation reaction between Zn(II) and hydroxyl or carboxyl groups on the GO sheets, while the electrostatic interaction also contribute to the whole interaction. Copyright © 2016 John Wiley & Sons, Ltd.

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“…Graphite oxide was prepared from natural flaky graphite using Hummers' Method, as reported previously . Graphite oxides prepared from the natural flaky graphites with the purities of 91, 95 and 99% were labelled as GrO‐91, GrO‐95 and GrO‐99, respectively.…”

Section: Methodsmentioning

confidence: 99%

Enhanced adsorption performance of the graphene oxide with metallic ion impurities by elution

Peng

Wang

et al. 2017

Surface & Interface Analysis

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The graphene oxides (GOs) with various content of metallic ions impurities were prepared, and the adsorption performance of the GO before and after elution was evaluated. The prepared GOs were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, inductively coupled plasma and atomic force microscopy. The results indicated that the metallic ion impurities hardly affected the interlayer distance, microstructure and thickness of the prepared GOs. The adsorption isotherm and adsorption kinetic results showed that the metallic ions adsorbed on the GO surface had a negative influence on both the adsorption capacity and rate. After eluted by HNO 3 or HCl, most of the metallic ions adsorbed on the GO-91 surface were ion-exchanged by the protons of the acid eluents, and the purified GO showed enhanced equilibrium capacities and improved adsorption rate. The elution efficiency of HCl was better than that of HNO 3 , and the adsorption capacity and rate of the GO eluted by HCl approximately reached to those of the GO prepared from the graphite with high purity. It indicated that HCl could efficiently remove the metallic ions adsorbed on the GO surface.

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Comparison of Pb(II) adsorption onto graphene oxide prepared from natural graphites: Diagramming the Pb(II) adsorption sites

Cited by 121 publications

References 36 publications

Lead adsorption by biochar under the elevated competition of cadmium and aluminum

Lead adsorption by biochar under the elevated competition of cadmium and aluminum

Adsorption of Zn(II) on graphene oxide prepared from low‐purity of amorphous graphite

Enhanced adsorption performance of the graphene oxide with metallic ion impurities by elution

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