Adsorption and removal of triphenylmethane dyes from water by magnetic reduced graphene oxide

2014 ◽  
Vol 70 (10) ◽  
pp. 1663-1669 ◽  
Author(s):  
Jian-Zhong Sun ◽  
Zhi-Hong Liao ◽  
Rong-Wei Si ◽  
Gakai Peter Kingori ◽  
Fu-Xiang Chang ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Adsorption Capacity ◽  
Reduced Graphene Oxide ◽  
Order Kinetic ◽  
Water Contaminants ◽  
Reduced Graphene ◽  
Organic Pollutants Removal ◽  
Adsorption Processes ◽  
Pollutants Removal ◽  
Magnetic Reduced Graphene Oxide

Triphenylmethane (TPM) dye is one of the most prevalent and recalcitrant water contaminants. Magnetic reduced graphene oxide (rGO) is an efficient adsorbent for organic pollutants removal. However, the performance and adsorption kinetics of magnetic rGO towards TPM have not yet been studied. In this study, a magnetic Fe3O4@rGO nano-composite, which could be easily removed from water with a simple magnetic separation step was synthesized and characterized. The magnetic rGO showed fast adsorption rate and high adsorption capacity towards different TPM dyes (the Langmuir monolayer adsorption capacity is 64.93 mg/g for adsorption of crystal violet). The adsorption processes are well-fitted to the pseudo-second-order kinetic model (R2 > 0.99) and the Langmuir isotherm model (R2 = 0.9996). Moreover, the magnetic rGO also showed excellent recycling and regeneration capabilities. The results indicated that adsorption with magnetic rGO would be a promising strategy to clean up the TPM contamination.

scholarly journals Polypyrrole modified magnetic reduced graphene oxide composites: synthesis, characterization and application for selective lead adsorption

RSC Advances ◽  
2020 ◽  
Vol 10 (30) ◽  
pp. 17524-17533 ◽  
Author(s):  
Zhanmeng Liu ◽  
Zhimin Gao ◽  
Lichun Xu ◽  
Fengping Hu
Keyword(s):  
Graphene Oxide ◽  
Adsorption Capacity ◽  
Reduced Graphene Oxide ◽  
Lead Adsorption ◽  
Reduced Graphene ◽  
Oxide Composites ◽  
Magnetic Reduced Graphene Oxide

Compared to Fe3O4/rGO, the PPy-FG composites showed desirable adsorption capacity and selectivity for Pb(ii) from water.

scholarly journals Study on the adsorption of polystyrene microplastics by three-dimensional reduced graphene oxide

2020 ◽  
Vol 81 (10) ◽  
pp. 2163-2175 ◽  
Author(s):  
Fang Yuan ◽  
Lingzhi Yue ◽  
Han Zhao ◽  
Huifang Wu
Keyword(s):  
Graphene Oxide ◽  
Adsorption Capacity ◽  
Reduced Graphene Oxide ◽  
Tap Water ◽  
Three Dimensional ◽  
Ion Concentration ◽  
Maximum Adsorption Capacity ◽  
Order Kinetic ◽  
Freeze Dried ◽  
Reduced Graphene

Abstract In this paper, a study on the removal of imitated polystyrene (PS) microplastics in water was carried out based on the adsorption capacity of three-dimensional reduced graphene oxide (3D RGO). Scanning electron microscopy and X-ray diffractometry characterization showed that the freeze-dried 3D RGO formed a distinct porous spatial structure. Different experimental parameters, such as pH, ion concentration (C0), contact time (t), and temperature (T), were studied to investigate the PS microplastic adsorption performance of 3D RGO. The adsorption mechanism was mainly attributed to the strong π–π interaction between the carbon ring of 3D RGO and the benzene ring of PS microplastics. Sorption kinetic and isothermal data were obtained by the well-fitted Langmuir adsorption isotherm model and pseudo-second-order kinetic model. Furthermore, the result of thermodynamic analysis showed that the adsorption of PS microplastics was a spontaneous endothermic process. Under the optimal conditions of pH = 6, C0 = 600 mg/L, t = 120 min, and T = 26 °C, the maximum adsorption capacity of the prepared 3D RGO on PS microplastics was 617.28 mg/g. Furthermore, this method exhibited good feasibility in tap water and lake water.

scholarly journals Cover Feature: Magnetic Reduced Graphene Oxide/Nickel/Platinum Nanoparticles Micromotors for Mycotoxin Analysis (Chem. Eur. J. 28/2018)

2018 ◽  
Vol 24 (28) ◽  
pp. 7071-7071
Author(s):  
Águeda Molinero-Fernández ◽  
Adrián Jodra ◽  
María Moreno-Guzmán ◽  
Miguel Ángel López ◽  
Alberto Escarpa
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Platinum Nanoparticles ◽  
Reduced Graphene ◽  
Mycotoxin Analysis ◽  
Nickel Platinum ◽  
Magnetic Reduced Graphene Oxide

scholarly journals Removal of Sulfadiazine Using 3D Interconnected Petal-Like Magnetic Reduced Graphene Oxide (MrGO) Nanocomposites

Water ◽  
2020 ◽  
Vol 12 (7) ◽  
pp. 1933
Author(s):  
Jie Zhong ◽  
Yong Feng ◽  
Jin-Ling Li ◽  
Bin Yang ◽  
Guang-Guo Ying
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Removal Rate ◽  
Physical Adsorption ◽  
Polluted Water ◽  
Adsorption Performance ◽  
Economic Methods ◽  
Reduced Graphene ◽  
Pure Fe3o4 ◽  
Magnetic Reduced Graphene Oxide

Adsorption has been regarded as one of the most efficient and economic methods for the removal of antibiotics from aqueous solutions. In this work, different graphene-based magnetic nanocomposites using a modified solvothermal method were synthesized and employed to remove sulfadiazine (SDZ) from water. The adsorption capacity of the optimal magnetic reduced graphene oxide (MrGO) was approximately 3.24 times that of pure Fe3O4. After five repeated adsorption cycles, the removal rate of SDZ (100 μg/L) by MrGO nanocomposites was still around 89.3%, which was only about a 3% decrease compared to that in the first cycle. Mechanism investigations showed that both chemical and physical adsorption contributed to the removal of SDZ. The excellent adsorption performance and recyclability of MrGO nanocomposites could be attributed to their wonderful 3D interconnected petal-like structures. The MrGO with SDZ could be easily recollected by magnetic separation. The MrGO also exhibited excellent adsorption performance in the purification of real polluted water.

Polyacrylamide-grafted magnetic reduced graphene oxide nanocomposite: preparation and adsorption properties

2019 ◽  
Vol 297 (6) ◽  
pp. 917-926 ◽  
Author(s):  
Ali Pourjavadi ◽  
Mojtaba Nazari ◽  
Mohammad Kohestanian ◽  
Seyed Hassan Hosseini
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Adsorption Properties ◽  
Reduced Graphene ◽  
Magnetic Reduced Graphene Oxide
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