Green Synthesis of Reduced Graphene Oxide with in situ Decoration of Metal Nanoparticles for Charge Storage Application

Rawal, Neha; Solanki, Sagar; Shah, Dimple

doi:10.1016/j.matpr.2020.01.325

Cited by 9 publications

(3 citation statements)

References 8 publications

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“…The functional group of AC before and after adsorption was analyzed using FTIR spectrophotometer (Shimadzu IRAffinity-1 s, Japan) in the spectral range of 4000–400 cm −1 . Finally, the data were analyzed by using Origin Software (Version 9.55) [ 5 , 56 , 57 ].…”

Section: Methodsmentioning

confidence: 99%

Optimization of Cr (VI) removal from aqueous solution with activated carbon derived from Eichhornia crassipes under response surface methodology

2023

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Tannery industries’ effluent contains a high concentration of Cr (VI) which has the potential to affect the environment and public health. Therefore, this study aimed to investigate the optimization of Cr (VI) adsorption by activated carbon (AC) derived from Eichhornia crassipes from an aqueous solution. The adsorbent was activated with dilute sulfuric acid followed by thermal activation. AC was characterized using proximate analysis, SEM, FTIR, X-ray diffraction, and the BET method. The Cr (VI) removal optimization process was performed using a central composite design under the response surface methodology. The proximate analysis showed that the moisture content, volatile matter, ash content, and fixed carbon of the activated carbon were 5.6%, 18.2%, 14.4%, and 61.8% respectively. The surface areas of the Eichhornia crassipes before activation, after activation, and after adsorption were 60.6 g/m2, 794.2 g/m2, and 412.6 g/m2 respectively. A highly porous structure with heterogeneous and irregular shapes was observed in the SEM micrograph. In the FTIR analysis, different peaks are indicated with various functional groups. The intensity of XRD peaks decreased as 2 theta values increased, which indicates the presence of an amorphous carbon arrangement. The point of zero charge (pHpzc) of the activated carbon was found to be 5.20. A maximum Cr (VI) removal of 98.4% was achieved at pH 5, contact time 90 min, adsorbent dose 2 g, and initial Cr (VI) concentration of 2.25 mg/L. Statistically significant interactions (P < 0.05) were observed between the initial Cr (VI) concentration and adsorbent dose as well as the initial Cr (VI) concentration and contact time. Langmuir adsorption isotherm fitted the experimental data best, with an R2 value of 0.99. The separation constant (RL) indicates that the adsorption process is favorable. The kinetic experimental data were best fitted with the pseudo-second-order model with an R2 value of 0.99 whereas the adsorption rate is controlled by intraparticle and extragranular diffusion processes. Generally, the AC has the potential to be a strong adsorbent candidate for wastewater treatment at the industrial level.

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Section: Methodsmentioning

confidence: 99%

Optimization of Cr (VI) removal from aqueous solution with activated carbon derived from Eichhornia crassipes under response surface methodology

2023

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“…Graphene is a unique structure that attracts great attention due to its interesting physical and chemical characteristics (Luo et al, 2020), including large surface area, good conductivity, and high thermal properties (Ouyang et al, 2013). Graphene and its derivatives are used in extensive applications such as electronic devices (Moozarm Nia et al, 2017), energy storage (Rawal et al, 2020), and biomedical applications (Kumar et al, 2017). The presence of oxygen functional groups such as epoxide, carboxyl, and hydroxyl in the structure of the graphene oxide (GO) and reduced graphene oxide (RGO) makes them suitable for the production of nanocomposites (Gan et al, 2019a).…”

Section: Introductionmentioning

confidence: 99%

Sonochemical synthesis of a copper reduced graphene oxide nanocomposite using honey and evaluation of its antibacterial and cytotoxic activities

Ismail

Shameli²,

Sukri³

et al. 2022

Front. Mol. Biosci.

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The combination of graphene-based materials and inorganic nanoparticles for the enhancement of the nanomaterial properties is extensively explored nowadays. In the present work, we used a sonochemical method to synthesize a copper/reduced graphene oxide (Cu/RGO) nanocomposite using Australian honey and vitamin C as capping and reducing agents, respectively. The honey-mediated copper/reduced graphene oxide (H/Cu/RGO) nanocomposite was then characterized through UV-visible, XRD, HRTEM, and FTIR analysis. The copper nanoparticles (Cu-NPs) in the nanocomposite formed uniform spherical shapes with a size of 2.20 ± 0.70 nm, which attached to the reduced graphene oxide (RGO) layers. The nanocomposite could suppress bacterial growth in both types of bacteria strains. However, in this study, the nanocomposite exhibited good bactericidal activity toward the Gram-positive bacteria than the Gram-negative bacteria. It also showed a cytotoxic effect on the cancer colorectal cell line HCT11, even in low concentrations. These results suggested that the H/Cu/RGO nanocomposite can be a suitable component for biomedical applications.

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“…[1][2][3] Among them, reduced graphene oxide (rGO) has paved the way for their easy approaches in the development of nanocomposite materials. [4][5][6][7][8][9][10] Furthermore, composites of rGO decorated with metal nanoparticles facilitate the enhancement of physical and chemical properties and exhibit impressive performance in catalysis, 5,7,[11][12][13][14] energy storage electrode materials, 9,15,16 chemical sensing, 17,18 biosensors, 19,20 antibacterial agents, 8 and biomedical applications. 21,22 For example, the incorporation of Ag, Au, Pt, and Pd nanoparticles into rGO has been studied.…”

Section: Introductionmentioning

confidence: 99%

One-Pot Green Synthesis and Catalytic Activity of Bismuth/Reduced Graphene Oxide (Bi/rGO) Nanocomposite Using Lemon Juice

Mahiuddin¹,

Ochiai²

2022

ECS Trans.

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A facile, cost-effective, and one-pot green strategy was introduced to prepare a nanocomposite (Bi/rGO) of reduced graphene oxide (rGO) decorated with bismuth nanoparticles (BiNPs) using lemon juice as a reducing agent. Simultaneous reduction of Bi3+ to BiNPs and GO to rGO produced the Bi/rGO nanocomposite consisting of 20-50 nm of BiNPs and a few layers of exfoliated rGO sheets. The obtained Bi/rGO nanocomposite showed excellent catalytic efficacy for the reduction of 4-nitrophenol to 4-aminophenol in the presence of sodium borohydride.

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Green Synthesis of Reduced Graphene Oxide with in situ Decoration of Metal Nanoparticles for Charge Storage Application

Cited by 9 publications

References 8 publications

Optimization of Cr (VI) removal from aqueous solution with activated carbon derived from Eichhornia crassipes under response surface methodology

Optimization of Cr (VI) removal from aqueous solution with activated carbon derived from Eichhornia crassipes under response surface methodology

Sonochemical synthesis of a copper reduced graphene oxide nanocomposite using honey and evaluation of its antibacterial and cytotoxic activities

One-Pot Green Synthesis and Catalytic Activity of Bismuth/Reduced Graphene Oxide (Bi/rGO) Nanocomposite Using Lemon Juice

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