Fabrication, characterization, and adsorption capacity for cadmium ions of graphene aerogels

Trinh, Truong Thi Phuong Nguyet Xuan; Quang, Dong Thanh; Tu, Tran Hoang; Dat, Nguyen Minh; Linh, Vu Ngoc Phuong; Cường, Lê Văn; Nghia, Le Tran Trung; Loan, Tran Thi Thanh; Hang, P; Phuong, Nguyen Thi Lien; Phong, Mai Thanh; Nam, Hoàng Minh; Hieu, Nguyen Huu

doi:10.1016/j.synthmet.2018.11.020

Cited by 44 publications

(8 citation statements)

References 17 publications

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“…presence of epoxy, hydroxyl, and carboxyl groups [40]. The (001) peak of rGOA-0 decreases, and a faint (002) facet of graphitic carbon appears at 2θ = 25.3° [41]. It proves that incomplete reduction occurs on the rGOA-0 nanosheets surface, which agrees with the SEM observations.…”

Section: Scanningsupporting

confidence: 87%

Vitamin C-Assisted Fabrication of Aerogels from Industrial Graphene Oxide for Gaseous Hexamethyldisiloxane Adsorption

Zheng

Hou

et al. 2021

Applied Sciences

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Volatile methyl siloxanes (VMSs) as a trace impurity in biogas decreases its energy utilization, and thus need to be removed. In this paper, a one-step hydrothermal reduction was performed to produce three-dimensional reduced graphene oxide aerogels (rGOAs) using industrial-grade graphene oxide (IGGO) as raw material and vitamin C (VC) as a reductant to facilitate the fabrication of rGOAs. The synthesis of rGOAs was a simple, green, and energy-efficient process. The developed rGOAs were characterized using the Brunauer–Emmett–Teller method, Raman spectrometry, scanning electron microscopy, Fourier-transform infrared spectroscopy, X-ray diffraction measurements and contact angle. The results obtained showed that rGOA-1 with a VC/IGGO ratio of 1/1 (m/m) exhibited a hierarchical porous structure and super-hydrophobicity, yielding a high specific surface area (137.9 m2 g−1) and superior water contact angle (143.8°). The breakthrough adsorption capacity of rGOA-1 for hexamethyldisiloxane (L2, a VMS model) was 11 times higher than that of IGGO. Low inlet concentration and bed temperature were considered beneficial for the L2 adsorption. Interestingly, rGOA-1 was less sensitive to water, and it was readily regenerated for reuse by annealing at 80 °C. The rGOAs have been demonstrated to have great potential for the removal of siloxanes from biogas.

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Section: Scanningsupporting

confidence: 87%

Vitamin C-Assisted Fabrication of Aerogels from Industrial Graphene Oxide for Gaseous Hexamethyldisiloxane Adsorption

Zheng

Hou

et al. 2021

Applied Sciences

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“…For SGO, no (001) reflection of graphene oxide appeared. Instead, two peaks appeared at 24.76 °, 43.40 °, which are assigned to the (002), (100) reflections of graphene, respectively [20]. These suggested that, GO was reduced during SGO fabrication.…”

Section: Characterization Of Sgomentioning

confidence: 97%

A Highly Efficient Adsorbent Based on Starch-Graphene Oxide Architecture for Scavenging Aqueous Pb(II): Isotherms, Kinetics, Thermodynamics and Interaction Mechanism

et al. 2021

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Heavy metal pollution stems from the modern industry is a severe environmental problem. In this work, a highly efficient adsorbent based on starch-graphene oxide architecture (SGO) was fabricated, characterized and employed to scavenge aqueous Pb(Π). The scavenging performance was evaluated, and the interaction mechanism between SGO and Pb(Π) was elucidated. Results indicate, the starch introduction brought performance enhancement, consequently made SGO outperform both single starch and GO in terms of adsorption efficiency. SGO adsorbs 95.83 % of Pb(Π) in 16 min, with adsorption capacity 383.32 mg•g -1 , manifesting some advantages over other analogous adsorbents, such as higher capacity and faster kinetics. The chemical interaction between Pb(OH) + and C=O, C-O related groups in SGO supported the adsorption, which was a spontaneous, exothermic and entropy increasing process. The adsorption was well described by the Freundlich, pseudo-second-order model and Intra-particle diffusion models, both intra-particle diffusion and chemical interaction were the rate controlling steps. Based on its high adsorption efficiency, SGO may have promising application in heavy metal scavenging from water.

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“…Raman spectra of graphene oxide and MnFe2O4/graphene oxide were showed in Figure 3c. The structural defects are responsible for the D peak that resulted from out of the plane of sp 2 bonded carbon atoms, while the G peak is attributed to in-plane vibrations [48]. The defect of the material was represented by the (ID/IG) intensity ratio.…”

Section: Nanocomposite Characterizationmentioning

confidence: 99%

“…The nanocomposite's magnetic properties are attributed to the load of magnetic ferrite over the graphene oxide[46,47].Raman spectra of graphene oxide and MnFe 2 O 4 /graphene oxide were showed in Figure3c. The structural defects are responsible for the D peak that resulted from out of the plane of sp 2 bonded carbon atoms, while the G peak is attributed to in-plane vibrations[48].…”

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confidence: 99%

Synthesis of Manganese Ferrite/Graphene Oxide Magnetic Nanocomposite for Pollutants Removal from Water

et al. 2021

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These days, environmental pollution, notably water pollution, has increasingly caused severe human health problems. The major water pollutants are heavy metals. MnFe2O4/GO nanocomposite was prepared in the current work via in situ method and tested to remove lead ion Pb2+ and neutral red (NR) dye from water. The prepared nanocomposite was characterized using different techniques, including X-ray diffraction, transmission electron microscopy, Fourier transform infrared spectroscopy, scanning electron microscopy, X-ray photoelectron spectroscopy, Raman spectra, and vibrating sample magnetometer. The prepared nanocomposite showed high adsorption capacity toward Pb2+ and NR dye removal according to Langmuir fitting indicating the monolayer homogeneous adsorption of pollutants over the adsorbent surface and can be separated easily with an external magnet. The effect of different factors, including contact time, pH, initial concentration, and adsorbent dose on the adsorption, were also studied. The increased concentration of pollutants led to increased adsorption capacity from 63 to 625 mg/g for Pb2+ ions and from 20 to 90 mg/g for NR dye. The increased adsorbent dose led to increased removal efficiency from 39% to 98.8% and from 63% to 94% for Pb2+ and NR dye, respectively. The optimum pH for the adsorption of both pollutants was found to be 6.0. The reusability of MnFe2O4/GO nanocomposite was studied for up to five cycles. The nanocomposite can keep its efficiency even after the studied cycles. So, the prepared magnetic nanocomposite is a promising material for water treatment.

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Fabrication, characterization, and adsorption capacity for cadmium ions of graphene aerogels

Cited by 44 publications

References 17 publications

Vitamin C-Assisted Fabrication of Aerogels from Industrial Graphene Oxide for Gaseous Hexamethyldisiloxane Adsorption

Vitamin C-Assisted Fabrication of Aerogels from Industrial Graphene Oxide for Gaseous Hexamethyldisiloxane Adsorption

A Highly Efficient Adsorbent Based on Starch-Graphene Oxide Architecture for Scavenging Aqueous Pb(II): Isotherms, Kinetics, Thermodynamics and Interaction Mechanism

Synthesis of Manganese Ferrite/Graphene Oxide Magnetic Nanocomposite for Pollutants Removal from Water

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