Functionalized reduced graphene oxide (fRGO) for removal of fulvic acid contaminant

Ray, Soumya Kanta; Majumder, Chanchal; Saha, Prosenjit

doi:10.1039/c7ra01069a

Cited by 32 publications

(8 citation statements)

References 71 publications

(92 reference statements)

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“…rGOs, formed from the thermal, chemical, or electrochemical reduction of GOs to graphene-like sheets, are more defective and consequently less conductive than virgin graphenes (Dreyer et al, 2010). However, rGOs are still adequately conductive for use in numerous applications, including as adsorbents for the removal of inorganic/heavy metal (Lingamdinne et al, 2017; and organic contaminants (Ali and Sandhya, 2014;Gupta and Khatri, 2017;Liu et al, 2016b;Ray et al, 2017) from aqueous solutions. Fig.…”

Section: Introductionmentioning

confidence: 99%

Aqueous removal of inorganic and organic contaminants by graphene-based nanoadsorbents: A review

et al. 2018

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Various graphene-based nanoadsorbents, including graphenes, graphene oxides, reduced graphene oxides, and their nanocomposites, have been widely studied as potential adsorbents due to their unique physicochemical properties, such as structural variability, chemical strength, low density, and the possibility of large scale fabrication. Adsorption mechanisms are governed largely by the physicochemical properties of contaminants, the characteristics of nanoadsorbents, and background water quality conditions. This review summarizes recent comprehensive studies on the removal of various inorganic (mainly heavy metals) and organic contaminants by graphene-based nanoadsorbents, and also discusses valuable information for applications of these nanoadsorbents in water and wastewater treatment. In particular, the aqueous removal of various contaminants was reviewed to (i) summarize the general adsorption capacities of various graphene-based nanoadsorbents for the removal of different inorganic and organic contaminants, (ii) evaluate the effects of key water quality parameters such as pH, temperature, background major ions/ionic strength, and natural organic matter on adsorption, (iii) provide a comprehensive discussion of the mechanisms that influence adsorption on these nanoadsorbents, and (iv) discuss the potential regeneration and reusability of nanoadsorbents. In addition, current challenges and future research needs for the removal of contaminants by graphene-based nanoadsorbents in water treatment processes are discussed briefly.

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Section: Introductionmentioning

confidence: 99%

Aqueous removal of inorganic and organic contaminants by graphene-based nanoadsorbents: A review

et al. 2018

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“…At the optimal pH for Cr(VI) removal of 3, HA (p K a = 4.5) remained undissociated and became hydrophobic, while the nanocomposite surface became positively charged. Thus, the nanocomposite attracted little undissociated HA by weak induction at pH 3.0, in contrast to the Cr(VI) removal mechanism of the nanocomposite (Figures S12 and S13). This result also showed that at pH 3.0 the HA adsorbed on the nanocomposite can improve the removal Cr(VI) ions.…”

Section: Results and Discussionmentioning

confidence: 97%

Recyclable Nanocomposite of Flowerlike MoS₂@Hybrid Acid-Doped PANI Immobilized on Porous PAN Nanofibers for the Efficient Removal of Cr(VI)

Qiu

Liu

Cheng

et al. 2017

ACS Sustainable Chem. Eng.

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For the preparation of an ideal material for the emergency disposal of Cr(VI)-contaminated water, a recyclable nanocomposite of molybdenum disulfide@hybrid acid-doped polyaniline immobilized on porous polyacrylonitrile nanofibers (MoS2@PANI/PAN nanocomposite) was synthesized successively through electrospinning, a hydrothermal process, and in situ polymerization. The advantages of the flowerlike MoS2@PANI/PAN nanocomposite include a fast equilibrium rate (30 min), a high removal capacity (6.57 mmol/g), and good recyclability. Thus, the material’s performance is much better than those of many earlier materials developed for similar applications. MoS2@PANI/PAN nanocomposite still showed high adsorption capacity toward Cr(VI) in the presence of coexisting anions and natural organic matter. The remarkable interaction of this material with Cr(VI) was shown to mainly occur through ion exchange, electrostatic adsorption, and reduction. Furthermore, the MoS2@PANI/PAN nanocomposite could be thoroughly regenerated and successfully reused for more than six cycles without a significant decrease in its removal capacity. Additional favorable properties of MoS2@PANI/PAN nanocomposite are its strong hydrophilic performance and high mechanical strength. Hence, MoS2@PANI/PAN provides a green, economic, and fast method to efficiently remove toxic Cr(VI) from aqueous environments.

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“…Peaks at 1648 and 1430 cm −1 are attributed to the stretching vibrations of CC of r-GO, while the peak at 1114 cm −1 is assigned to C−OH stretching vibrations. 64 Peaks at 2948 and 2835 cm −1 are corresponding to the asymmetric and S1). This may be attributed to the interaction of r-GO with the surface of TiO 2 exhibiting a hydrogen-bonding interaction.…”

Section: Resultsmentioning

confidence: 99%

Novel Green Approach for Fabrication of Ag₂CrO₄/TiO₂/Au/r-GO Hybrid Biofilm for Visible Light-Driven Photocatalytic Performance

et al. 2020

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Development of cutting edge materials using a benevolent ecologically cordial methodology is an ideal approach for heterogeneous visible light photocatalysis. A new biogenic photocatalyst was developed by coupling titanium dioxide (TiO 2 ) decorated elongated rhombic shape silver chromate (Ag 2 CrO 4 ) with gold (Au) and reduced graphene oxide (r-GO) for dye degradation applications under visible light. An ecologically positive methodology was utilized to develop the quaternary Ag 2 CrO 4 /TiO 2 /Au/r-GO nanostructures biofilm with gold and reduced graphene oxide (r-GO) via impregnation and in situ reduction technique in the presence of acacia gum. The structural properties and morphology of the Ag 2 CrO 4 /TiO 2 /Au/r-GO nanostructures were described by several spectroscopic and microscopic methods such as XRD, XPS, ATR-FTIR, Raman spectroscopy, FE-SEM, etc. Alteration with Au and r-GO decreased the band vitality and essentially improved the visible light ingestion of the quaternary Ag 2 CrO 4 /TiO 2 /Au/r-GO composite biofilm photocatalyst and slowed down the recombination process of the photogenerated electrons and holes. To demonstrate how such a unique heterostructured biofilm might produce more outstanding photocatalytic activity, we examined a comparison of the photocatalytic performances of Ag 2 CrO 4 /TiO 2 /Au/r-GO hybrid biofilm with different inner structures. The photocatalytic debasement of MB reached almost 97% within 52 min, and it has been found that the Ag 2 CrO 4 /TiO 2 /Au/r-GO biofilm increased the degradation rate of MB by a factor of 10.8, 6.5, and 3.1 in comparison with exposed Ag 2 CrO 4 , Ag 2 CrO 4 /TiO 2 , and Ag 2 CrO 4 / TiO 2 /Au biofilms, individually. Further, the high electron movement capacity of Ag 2 CrO 4 /TiO 2 /Au/r-GO biofilm was explored by photoelectrochemical investigation and TCSPC to comprehend the mechanistic insight of the superior activity of this composite nanostructures under visible light illumination. Hence, the present investigation describes a facile, eco-friendly, and biomimetic approach for the fabrication of Ag 2 CrO 4 /TiO 2 /Au/r-GO biofilm based photocatalyst using acacia gum.

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Functionalized reduced graphene oxide (fRGO) for removal of fulvic acid contaminant

Abstract: Iron-functionalized reduced graphene oxide (fRGO)-coated sand was used for the adsorption of natural organic matter, such as fulvic acid (FA), from synthetic water.

Cited by 32 publications

References 71 publications

Aqueous removal of inorganic and organic contaminants by graphene-based nanoadsorbents: A review

Aqueous removal of inorganic and organic contaminants by graphene-based nanoadsorbents: A review

Recyclable Nanocomposite of Flowerlike MoS₂@Hybrid Acid-Doped PANI Immobilized on Porous PAN Nanofibers for the Efficient Removal of Cr(VI)

Novel Green Approach for Fabrication of Ag₂CrO₄/TiO₂/Au/r-GO Hybrid Biofilm for Visible Light-Driven Photocatalytic Performance

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Functionalized reduced graphene oxide (fRGO) for removal of fulvic acid contaminant

Abstract: Iron-functionalized reduced graphene oxide (fRGO)-coated sand was used for the adsorption of natural organic matter, such as fulvic acid (FA), from synthetic water.

Cited by 32 publications

References 71 publications

Aqueous removal of inorganic and organic contaminants by graphene-based nanoadsorbents: A review

Aqueous removal of inorganic and organic contaminants by graphene-based nanoadsorbents: A review

Recyclable Nanocomposite of Flowerlike MoS2@Hybrid Acid-Doped PANI Immobilized on Porous PAN Nanofibers for the Efficient Removal of Cr(VI)

Novel Green Approach for Fabrication of Ag2CrO4/TiO2/Au/r-GO Hybrid Biofilm for Visible Light-Driven Photocatalytic Performance

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Product

Resources

About

Recyclable Nanocomposite of Flowerlike MoS₂@Hybrid Acid-Doped PANI Immobilized on Porous PAN Nanofibers for the Efficient Removal of Cr(VI)

Novel Green Approach for Fabrication of Ag₂CrO₄/TiO₂/Au/r-GO Hybrid Biofilm for Visible Light-Driven Photocatalytic Performance