Beyond the selective adsorption of polypyrrole-reduced graphene oxide nanocomposite toward Hg2+: Ultra-sensitive and -selective sensing Pb2+ by stripping voltammetry

2012 ◽  
Vol 23 ◽  
pp. 21-24 ◽  
Author(s):  
Zhi-Qiang Zhao ◽  
Xing Chen ◽  
Qing Yang ◽  
Jin-Huai Liu ◽  
Xing-Jiu Huang
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Selective Adsorption ◽  
Stripping Voltammetry ◽  
Reduced Graphene

Unexpected Selective Absorption of Lithium in Thermally Reduced Graphene Oxide Membranes

2021 ◽  
Vol 38 (11) ◽  
pp. 116802
Author(s):  
Jie Jiang ◽  
Liuhua Mu ◽  
Yu Qiang ◽  
Yizhou Yang ◽  
Zhikun Wang ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Selective Adsorption ◽  
Lithium Ion ◽  
Experimental Treatment ◽  
Selective Absorption ◽  
Confined Space ◽  
Mass Ratio ◽  
Valence States ◽  
Reduced Graphene

Lithium plays an increasingly important role in scientific and industrial processes, and it is extremely important to extract lithium from a high Mg2+/Li+ mass ratio brine or to recover lithium from the leachate of spent lithium-ion batteries. Conventional wisdom shows that Li+ with low valence states has a much weaker adsorption (and absorption energy) with graphene than multivalent ions such as Mg2+. Here, we show the selective adsorption of Li+ in thermally reduced graphene oxide (rGO) membranes over other metal ions such as Mg2+, Co2+, Mn2+, Ni2+, or Fe2+. Interestingly, the adsorption strength of Li+ reaches up to 5 times the adsorption strength of Mg2+, and the mass ratio of a mixed Mg2+/Li+ solution at a very high value of 500 : 1 can be effectively reduced to 0.7 : 1 within only six experimental treatment cycles, demonstrating the excellent applicability of the rGO membranes in the Mg2+/Li+ separation. A theoretical analysis indicates that this unexpected selectivity is attributed to the competition between cation–π interaction and steric exclusion when hydrated cations enter the confined space of the rGO membranes.

Polymeric ionic liquid modified reduced graphene oxide as adsorbent for highly selective isolation of acidic protein

RSC Advances ◽  
2014 ◽  
Vol 4 (106) ◽  
pp. 61936-61943 ◽  
Author(s):  
Jia-Wei Liu ◽  
Meng-Meng Wang ◽  
Yue Zhang ◽  
Lu Han ◽  
Xu-Wei Chen ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Sorption Capacity ◽  
Selective Adsorption ◽  
Selective Isolation ◽  
High Sorption Capacity ◽  
Polymeric Ionic Liquid ◽  
Reduced Graphene ◽  
High Sorption

A novel adsorbent is achieved by modifying reduced graphene oxide with polymeric ionic liquid and further assembly on SiO2 nanoparticles. This nano-hybrid exhibits selective adsorption of ovalbumin with an ultra-high sorption capacity.

Catalytically engineered reduced graphene oxide/ZnO hybrid nanocomposites for the adsorption, photoactivity and selective oil pick-up from aqueous media

RSC Advances ◽  
2015 ◽  
Vol 5 (62) ◽  
pp. 50223-50233 ◽  
Author(s):  
K. B. Babitha ◽  
J. Jani Matilda ◽  
A. Peer Mohamed ◽  
S. Ananthakumar
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Selective Adsorption ◽  
Aqueous Media ◽  
Crosslinking Agent ◽  
Hybrid Nanocomposites ◽  
Cotton Textile ◽  
Reduced Graphene

Microwave mediated in situ growth of nanocrystalline ZnO on rGO nanosheets is achieved using APTMS as the crosslinking agent. The deposition of hydrophobic ZnO/Si@rGO on a simple cotton textile results in the selective adsorption of oil from aqueous media.

Simultaneous determination of trace Cd2+ and Pb2+ using GR/l-cysteine/Bi modified screen-printed electrodes

2018 ◽  
Vol 10 (40) ◽  
pp. 4945-4950 ◽  
Author(s):  
Chao Li ◽  
Xiaole Zhao ◽  
Xiaojun Han
Keyword(s):  
Graphene Oxide ◽  
Simultaneous Determination ◽  
Reduced Graphene Oxide ◽  
Anodic Stripping Voltammetry ◽  
Stripping Voltammetry ◽  
Screen Printed Electrode ◽  
Reduced Graphene ◽  
Anodic Stripping ◽  
Screen Printed

A GR/l-cys/Bi/SPE (reduced graphene oxide/l-cysteine/Bi/screen-printed electrode) was prepared to simultaneously determine Cd2+ and Pb2+ ions by using SWASV (square wave anodic stripping voltammetry).

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