Novel graphene oxide/bentonite composite for uranium(VI) adsorption from aqueous solution

Liu, Hongjuan; Xie, Shuguang; Liao, Ju‐Hsiou; Yan, Tianrun; Liu, Yingjiu; Tang, Xinhai

doi:10.1007/s10967-018-5992-0

Cited by 41 publications

(18 citation statements)

References 62 publications

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“…4. FT-IR proves the chemical structure of GO showing the metal binding chemical groups such as O-H bonds at 3310 cm −1 , the stretching vibrations of -COOH bonds at 1715 cm −1 , stretching vibration of C=C bonds at 1630 cm −1 (Liu et al 2018), and -C-O stretching vibration at 1250 cm −1 (He et al 2015). FT-IR indicated the chemical structure of the nylon 6,6, with the certain chemical groups such as N-H stretching peaks at 3299 cm −1 , C-H stretching at 2861-2933 cm −1 , amide-I at 1637 cm −1 , amide-II at 1536 cm −1 (Haggenmueller et al 2006), and amide-III at 1370 cm −1 , O=C-H at 581 cm −1 , C-C at 687 cm −1 (Charles et al 2009).…”

Section: Ft-ir Studiesmentioning

confidence: 97%

Electrospinning of polymeric nanofiber (nylon 6,6/graphene oxide) for removal of Cr (VI): synthesis and adsorption studies

2019

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Polymer nanofibers are valuable materials that are of great importance because they are inexpensive and they display high strength. In this study, nylon-6,6 (N6,6)/graphene oxide (GO) nanofibers were developed and characterized. GO was synthesized from graphene using the known Hummer's method. GO is obtained by reaction of the graphene with strong oxidants and was characterized using Fourier-transform infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM). The characterizations showed that the graphene was suitably oxidized. GO was added to N6,6 to produce N6,6/GO nanofibers at loadings of 0.5, 1.0, 1.5, and 2.0 wt% through the melt mixing method. The batch adsorption model for Cr (VI) adsorption was applied as a function of time, initial Cr (VI) concentration, adsorbent dosage, and pH to examine nanofiber activity. N6,6/GO a exhibited high adsorption capacity for Cr (VI) at pH 2.0. The maximum adsorption capacity for Cr (VI) ion was found to be 47.17 mg/g of N6.6/ GO using the related isotherm curves and equations. When the equilibrium data were examined, it was concluded that Langmuir adsorption isotherm was more suitable.

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Section: Ft-ir Studiesmentioning

confidence: 97%

Electrospinning of polymeric nanofiber (nylon 6,6/graphene oxide) for removal of Cr (VI): synthesis and adsorption studies

2019

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“…The uranium equilibrium specific sorption capacity q e (mg/g) and removal rate η for each sorbent (SBB or ASBB) were calculated according to Eqs. 1 and 2, respectively (Liu et al, 2018):…”

Section: Analysis and Characterizationmentioning

confidence: 99%

Dual Effect of Acetic Acid Efficiently Enhances Sludge-Based Biochar to Recover Uranium From Aqueous Solution

et al. 2022

Front. Chem.

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Excess sludge (ES) treatment and that related to the uranium recovery from uranium-containing wastewater (UCW) are two hot topics in the field of environmental engineering. Sludge-based biochar (SBB) prepared from ES was used to recover uranium from UCW. Excellent effects were achieved when SBB was modified by acetic acid. Compared with SBB, acetic acid-modified SBB (ASBB) has shown three characteristics deserving interest: 1) high sorption efficiency, in which the sorption ratio of U(VI) was increased by as high as 35.0%; 2) fast sorption rate, as the equilibrium could be achieved within 5.0 min; 3) satisfied sorption/desorption behavior; as a matter of fact, the sorption rate of U(VI) could still be maintained at 93.0% during the test cycles. In addition, based on the test conditions and various characterization results, it emerged as a dual effect of acetic acid on the surface of SBB, i.e., to increase the porosity and add (−COOH) groups. It was revealed that U(VI) and −COO− combined in the surface aperture of ASBB via single-dentate coordination. Altogether, a new utilization mode for SBB is here proposed, as a means of efficient uranium sorption from UCW.

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“…Adsorption kinetics reflects the rate and efficiency of adsorption of uranium ions by the adsorbent [15,31,32]. The uranium adsorption kinetics of TA/GO from an aqueous solution as a function of contact time at pH = 3.6 ± 0.05 is displayed in Figure 4.…”

Section: Sorption Kineticsmentioning

confidence: 99%

Efficient Removal Of U(VI) Ions from Aqueous Solutions by Tannic Acid/Graphene Oxide Composites

et al. 2020

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Tannic acid/graphene oxide (TA/GO) composites were prepared in the present research, and their properties and sorption performance were evaluated by corresponding characterization methods and bath sorption experiments, respectively. The applications of TA/GO to remove U(VI) from aqueous solution were investigated with the maximum adsorption capacity of 87.8 mg·g−1 at low pH (pH = 3.6 ± 0.03). The sorption of U(VI) ions on TA/GO followed the Langmuir model because of the complexation of oxygen-containing functional groups on the surface of TA/GO composites and uranium ions. TA/GO manifested excellent selective adsorption toward uranium ions with other metal ions (Cs+, Sr2+, Co2+). Furthermore, TA/GO as an effective adsorbent was reused to remove a large amount of U(VI) ions from aqueous solution. Therefore, TA/GO is an ideal material to remove highly toxic U(VI) ions from wastewater.

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Novel graphene oxide/bentonite composite for uranium(VI) adsorption from aqueous solution

Cited by 41 publications

References 62 publications

Electrospinning of polymeric nanofiber (nylon 6,6/graphene oxide) for removal of Cr (VI): synthesis and adsorption studies

Electrospinning of polymeric nanofiber (nylon 6,6/graphene oxide) for removal of Cr (VI): synthesis and adsorption studies

Dual Effect of Acetic Acid Efficiently Enhances Sludge-Based Biochar to Recover Uranium From Aqueous Solution

Efficient Removal Of U(VI) Ions from Aqueous Solutions by Tannic Acid/Graphene Oxide Composites

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