Selective adsorption toward toxic metal ions results in selective response: electrochemical studies on a polypyrrole/reduced graphene oxide nanocomposite

2012 ◽  
Vol 48 (16) ◽  
pp. 2180-2182 ◽  
Author(s):  
Zhi-Qiang Zhao ◽  
Xing Chen ◽  
Qing Yang ◽  
Jin-Huai Liu ◽  
Xing-Jiu Huang
Keyword(s):  
Graphene Oxide ◽  
Metal Ions ◽  
Reduced Graphene Oxide ◽  
Selective Adsorption ◽  
Toxic Metal ◽  
Electrochemical Studies ◽  
Toxic Metal Ions ◽  
Reduced Graphene

scholarly journals A Novel Generation of Polysulfone/Crown Ether-Functionalized Reduced Graphene Oxide Membranes with Potential Applications in Hemodialysis

Polymers ◽  
2021 ◽  
Vol 14 (1) ◽  
pp. 148
Author(s):  
Andreea Madalina Pandele ◽  
Madalina Oprea ◽  
Andreea Aura Dutu ◽  
Florin Miculescu ◽  
Stefan Ioan Voicu
Keyword(s):  
Graphene Oxide ◽  
Crown Ether ◽  
Metal Ions ◽  
Reduced Graphene Oxide ◽  
Soft Tissues ◽  
Toxic Metal ◽  
Composite Membranes ◽  
Feed Solution ◽  
Membrane Thickness ◽  
Reduced Graphene

Heavy metal poisoning is a rare health condition caused by the accumulation of toxic metal ions in the soft tissues of the human body that can be life threatening if left untreated. In the case of severe intoxications, hemodialysis is the most effective method for a rapid clearance of the metal ions from the bloodstream, therefore, the development of hemodialysis membranes with superior metal ions retention ability is of great research interest. In the present study, synthetic polysulfone membranes were modified with reduced graphene oxide functionalized with crown ether, an organic compound with high metal ions complexation capacity. The physico-chemical characteristics of the composite membranes were determined by FT-IR, Raman, XPS and SEM analysis while their efficiency in retaining metal ions was evaluated via ICP-MS analysis. The obtained results showed that the thermal stability of reduced graphene oxide was improved after functionalization with crown ether and that the presence of the carbonaceous filler influenced the membranes morphology in terms of pore dimensions and membrane thickness. Moreover, the ability of Cu2+ ions retention from synthetic feed solution was up to three times higher in the case of the composite membranes compared to the neat ones.

Selective adsorption of uranyl and potentially toxic metal ions at the core-shell MFe2O4-TiO2 (M=Mn, Fe, Zn, Co, or Ni) nanoparticles

2019 ◽  
Vol 365 ◽  
pp. 835-845 ◽  
Author(s):  
Liang Bian ◽  
Jianan Nie ◽  
Xiaoqiang Jiang ◽  
Mianxin Song ◽  
Faqin Dong ◽  
...  
Keyword(s):  
Metal Ions ◽  
Selective Adsorption ◽  
Toxic Metal ◽  
Core Shell ◽  
Ni Nanoparticles ◽  
Toxic Metal Ions ◽  
The Core

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.

Simultaneous Electrochemical Detection of Multiple Heavy-Metal Ions Based on Furfural/Reduced Graphene Oxide Composites

2021 ◽  
Author(s):  
Xiaoyun Xu ◽  
Xiaoyi Lv ◽  
Fei Tan ◽  
Yanping Li ◽  
Chao Geng ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Graphene Oxide ◽  
Metal Ions ◽  
Reduced Graphene Oxide ◽  
Heavy Metal Ions ◽  
Simultaneous Detection ◽  
Reduced Graphene ◽  
The Matrix ◽  
One Step ◽  
Oxide Composites

Abstract An efficient and sensitive electrochemical sensor for simultaneous detection of heavy metal ions was developed based on furfural/reduced graphene oxide composites (FF/RGO). The preparation of FF/RGO were performed through a one-step high-pressure assisted hydrothermal treatment, which is recommended as a green, convenient, and efficient way for the reduction of graphene oxide and the production of FF/RGO composites. RGO not only serves as the skeleton for furfural loading but also improves the conductivity of the composites in the matrix. FF/RGO with large specific surface area and abundant oxygen-containing functional groups was used to provide more binding sites for the effificient adsorption of heavy-metal ions due to the interaction between hydrophilic groups (-COOH, -OH, and -CHO) and metal cations. The developed sensor showed identifiable electrochemical response toward the heavy metal ions separately and simultaneously, exhibiting superior stability, outstanding sensitivity, selectivity and excellent analytical performance. Impressively, the sensor developed in this experiment has been successfully applied to the simultaneous determination of various heavy metal ions in actual samples, which has definitely exhibited a promising prospect in practical application.

Photophysical and Electrochemical Studies of Anchored Chromium (III) Complex on Reduced Graphene Oxide via Diazonium Chemistry

2019 ◽  
Author(s):  
Jemini Jose ◽  
Athimotlu Raju Rajamani ◽  
Sreekanth Anandaram ◽  
Sujin P. Jose ◽  
Sebastian C. Peter ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Electrochemical Studies ◽  
Reduced Graphene
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