Algal extracts based biogenic synthesis of reduced graphene oxides (rGO) with enhanced heavy metals adsorption capability

Ahmad, Shahbaz; Ahmad, Aftab; Khan, Sikandar; Ahmad, Shujaat; Khan, Idrees; Zada, Shah; Fu, Pengcheng

doi:10.1016/j.jiec.2018.12.009

Cited by 57 publications

(16 citation statements)

References 57 publications

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“…Similarly, Krystyjan et al (2021) noted a peak at about 233 nm and a wider band at 290-305 nm while studying Starch/Chitosan polymer nanocomposite. The absorbance band peaks at 220 nm (-C¼O) (Kavitha, 2017), 227 nm (C-C aromatic bonds) (Ahmad, 2019), and 230-235 (C¼C) (Krystyjan et al, 2021) arose due to π → π* transition. The peak at 297-300 nm is associated with n → π* transition of C¼O bonds (Ahmad, 2019;Krystyjan et al, 2021).…”

Section: Ultraviolet-visible (Uv-vis) Spectroscopy Analysismentioning

confidence: 99%

Plasticized magnetic starch-based Fe3O4 clay polymer nanocomposites for phosphate adsorption from aqueous solution

Atnafu

Leta

2021

Heliyon

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Plastics contribute a magnificent role to modern civilization, but the waste becomes a huge burden to ecology and remains intact for a thousand years. Hence, the recent movement is shifted to biodegradable plastic. In this study, an attempt was made to introduce an added value to the environment where the bio-plasticized materials were used for phosphate removal. A G-plasticized magnetic starch-based Fe 3 O 4 clay polymer nanocomposite (PNC) was synthesized to remove phosphate from the aqueous solution. It was synthesized from activated carbon (AC), coated iron oxide nanoparticles (CIONP), nanoclay (NC), and glycerol (G) as a plasticizer. The synthesized adsorbents were characterized with UV-Vis, SEM, XRD, and FTIR. The PNC and constituent (CIONP) were tested for phosphate removal through batch adsorption experiments. The adsorption capacity increases with increasing the adsorbent dose and decreases with an increase in phosphate concentration. The synthesized PNC effectively raised the constituent optimum phosphate ion adsorption pH from acidic (pH ¼ 3) to slightly acidic (pH ¼ 6). At the optimal pH, the CIONP and PNC maximum phosphate adsorption capacity (MPAC) was 3.12 and 2.31 mg P/g, respectively. In addition, the phosphate removal efficiency of PNC (45-95% at pH 6) was comparable to CIONP (58-97% at pH 3) under an initial 2-100 mg P/L. The adsorbents adsorption kinetics and isotherm study best described by the pseudo-second-order and Freundlich model, in turn. The SEM images support the conclusion, in which the PNC shows a heterogenous porous surface. Therefore, the adsorption mechanisms were mainly described by multilayer and chemical adsorption, such as electrostatic and ion exchange. It can be concluded that there is a positive synergistic effect between the biopolymer (starch) and nanomaterials that form the PNC. This study results propose the multiple added values of modified bio-plasticized material (with adsorbent) for environmental (phosphate) remediation.

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Section: Ultraviolet-visible (Uv-vis) Spectroscopy Analysismentioning

confidence: 99%

Plasticized magnetic starch-based Fe3O4 clay polymer nanocomposites for phosphate adsorption from aqueous solution

Atnafu

Leta

2021

Heliyon

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“…Through the above analysis, the optimal balance time was chosen as 240 min for subsequent experiments. The maximum Cu 2+ adsorption capacity of the rGO membrane was 149.25 mg/g; compared to the adsorption capacity of other adsorbents [ 24 , 25 , 26 , 27 ], the capacity of the rGO prepared in this work was greater ( Table 2 ). The promotion of adsorption could be attributed to the layer structure of the rGO film, which provided an inner layer pass road.…”

Section: Resultsmentioning

confidence: 66%

Self-Supported Reduced Graphene Oxide Membrane and Its Cu2+ Adsorption Capability

Wang

Sun

et al. 2020

Materials

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Graphene stratiform membrane materials have been recently applied to heavy metal removal in aqueous systems via adsorption due to their high mechanical strength, chemical stability, and other properties. We applied reduced graphene oxide (rGO) alone as an adsorbent to remove heavy metal ions from wastewater. Self-supported rGO membrane was prepared using a green reduction method with sodium hydrosulfite. We used the Raman spectra to observe the structure of the rGO membrane. The morphology of the self-supported membrane was measured by a scanning electron microscope. The Cu2+ adsorption performance was measured in terms of pH, reaction time, metal ion concentration, and temperature. The maximum Cu2+ adsorption capacity of the rGO membrane was found to be 149.25 mg/g. The adsorption process followed a pseudo-second-order kinetic model, and adsorption isotherms were simulated by the Freundlich model.

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“…As previously reported, SEM is the most important technique for characterization of morphology of rGO and its derivatives because of the highly energetic electrons used to produce the SEM images of the samples (Lee et al, 2019). In addition, it can be used to observe the topography, crystallographic structure, shape, size, and composition of materials (Ahmad et al, 2019). Indeed, the thickness and number of layers of graphene and its derivatives can be calculated based on the color depth (Dong & Chen, 2010).…”

Section: Morphology and Composition Studiesmentioning

confidence: 99%

“…The structure of graphene, consisting of layers, makes graphene highly conductive with a carrying mobility of up to 200,000 cm 2 V -1 s -1 and thermal conductivity of up to 5,300 Wm -1 K -1 (Bolotin et al, 2008;Balandin et al, 2008). Graphene oxide (GO) and its reduced graphene oxide (rGO) are classified as graphene family materials and have many applications, such as optical, in biomedical water treatment, and as adsorbents (Raghavan et al, 2017;Ahmad et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Graphite Oxide, Graphene Oxide and Reduced Graphene Oxide from Graphite Waste using Modified Hummers’s Method and Zinc as Reducing Agent

Kusrini¹,

Suhrowati²,

Usman³

et al. 2019

IJTech

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(XRD) characterizations. The FTIR analysis confirmed the formation of GO. Although some restacking/unexfoliated graphite structures showed a diffraction peak at 2θ of 26.54, the XRD analysis clearly exhibited a peak at 2θ of 20.04, assigned to rGO after reduction of the GO. The smallest particle size of rGO was observed in the range of 1 to 10 m when under ultrasonication time of 1 h and Zn mass of 8 g. The FTIR spectrum of GO showed that there was a functional group C=C, which is an indication of rGO formation due to the covalent bonding of the graphene structure. SEM image of the rGO showed that the morphology seemed thick and layer stacking. The quality of rGO produced in this study needs to be improved further to meet requirements for applications.

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Algal extracts based biogenic synthesis of reduced graphene oxides (rGO) with enhanced heavy metals adsorption capability

Cited by 57 publications

References 57 publications

Plasticized magnetic starch-based Fe3O4 clay polymer nanocomposites for phosphate adsorption from aqueous solution

Plasticized magnetic starch-based Fe3O4 clay polymer nanocomposites for phosphate adsorption from aqueous solution

Self-Supported Reduced Graphene Oxide Membrane and Its Cu2+ Adsorption Capability

Synthesis and Characterization of Graphite Oxide, Graphene Oxide and Reduced Graphene Oxide from Graphite Waste using Modified Hummers’s Method and Zinc as Reducing Agent

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