Computational DFT study of magnetite/graphene oxide nanoadsorbent: interfacial chemical behavior and remediation performance of heavy metals hydrates from aqueous system

2020 ◽  
Author(s):  
Esraa M. El‐Fawal ◽  
L. Saad ◽  
Y.M. Moustafa
Keyword(s):  
Heavy Metals ◽  
Graphene Oxide ◽  
Aqueous System ◽  
Dft Study ◽  
Chemical Behavior

Advances in Graphene for Adsorption of Heavy Metals in Wastewater

2012 ◽  
Vol 550-553 ◽  
pp. 2121-2124 ◽  
Author(s):  
Ling Ling Luo ◽  
Xing Xing Gu ◽  
Jun Wu ◽  
Shu Xian Zhong ◽  
Jian Rong Chen
Keyword(s):  
Waste Water ◽  
Heavy Metals ◽  
Aqueous Solution ◽  
Graphene Oxide ◽  
Physical Structure ◽  
High Specific Surface Area ◽  
Functionalized Graphene ◽  
Storage Material ◽  
Energy Storage Material ◽  
Material Composite

Graphene for its unique physical structure, excellent mechanical, electrical and physical properties has been widely applied in nanoelectronics, microelectronics, energy storage material, composite materials and so on. In recent years, many researchers found graphene have outstanding adsorption capacity of contaminants in aqueous solution due to its high specific surface area. This paper summarized the graphene, graphene oxide and functionalized graphene removing various heavy metals in waste water.

A DFT study of the Pb ion adsorption on smithsonite (101) surface in aqueous system

2021 ◽  
pp. 117560
Author(s):  
Yuanjia Luo ◽  
Leming Ou ◽  
Jianhua Chen ◽  
Guofan Zhang ◽  
Yuqin Xia ◽  
...  
Keyword(s):  
Aqueous System ◽  
Dft Study ◽  
Ion Adsorption

scholarly journals Cotransport of Cu with Graphene Oxide in Saturated Porous Media with Varying Degrees of Geochemical Heterogeneity

Water ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 444 ◽  
Author(s):  
Jianzhou He ◽  
Dengjun Wang ◽  
Tingting Fan ◽  
Dongmei Zhou
Keyword(s):  
Heavy Metals ◽  
Porous Media ◽  
Graphene Oxide ◽  
Iron Oxide ◽  
Colloidal Stability ◽  
Maximum Adsorption Capacity ◽  
Solution Ph ◽  
Physicochemical Conditions ◽  
Subsurface Environment ◽  
Geochemical Heterogeneity

Graphene oxide (GO) is likely to encounter heavy metals due to its widespread use and inevitable release into the subsurface environment, where the ubiquitous presence of iron oxides (e.g., hematite) would affect their interaction and transport. The present study aimed to investigate the cotransport of GO (20 mg L−1) and copper (0.05 mM CuCl2) in the presence of varying degrees of geochemical heterogeneity represented by iron oxide-coated sand fractions (ω = 0‒0.45) in water-saturated columns under environmentally relevant physicochemical conditions (1 mM KCl at pH 5.0‒9.0). The Langmuir-fitted maximum adsorption capacity of Cu2+ by GO reached 137.6 mg g−1, and the presence of 0.05 mM Cu2+ decreased the colloidal stability and subsequent transport of GO in porous media. The iron oxide coating was found to significantly inhibit the transport of GO and Cu-loaded GO in sand-packed columns, which can be explained by the favorable deposition of the negatively charged GO onto patches of the positively charged iron oxide coatings at pH 5.0. Increasing the solution pH from 5.0 to 9.0 promoted the mobility of GO, with the exception of pH 7.5, in which the lowest breakthrough of GO was observed. This is possibly due to the fact that the surface charge of iron oxide approaches zero at pH 7.5, suggesting that new “favorable” sites are available for GO retention. This study deciphered the complicated interactions among engineered nanomaterials, heavy metals, and geochemical heterogeneity under environmentally relevant physicochemical conditions. Our results highlight the significant role of geochemical heterogeneity, such as iron oxide patches, in determining the fate and transport of GO and GO-heavy metal association in the subsurface environment.

Recent trends in the synthesis of graphene and graphene oxide based nanomaterials for removal of heavy metals — A review

2018 ◽  
Vol 66 ◽  
pp. 29-44 ◽  
Author(s):  
Jihn Yih Lim ◽  
N.M. Mubarak ◽  
E.C. Abdullah ◽  
Sabzoi Nizamuddin ◽  
Mohammad Khalid ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Graphene Oxide ◽  
Removal Of Heavy Metals ◽  
Recent Trends
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