Critical Evaluation of Adsorption-Desorption Hysteresis of Heavy Metal Ions from Carbon Nanotubes: Influence of Wall Number and Surface Functionalization

2014 ◽  
Vol 9 (4) ◽  
pp. 1144-1151 ◽  
Author(s):  
Jie Li ◽  
Changlun Chen ◽  
Shouwei Zhang ◽  
Xuemei Ren ◽  
Xiaoli Tan ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Heavy Metal ◽  
Metal Ions ◽  
Surface Functionalization ◽  
Heavy Metal Ions ◽  
Critical Evaluation ◽  
Desorption Hysteresis ◽  
Adsorption Desorption

Metal in situ surface functionalization of polymer-grafted-carbon nanotube composite membranes for fast efficient nanofiltration

2017 ◽  
Vol 5 (2) ◽  
pp. 583-592 ◽  
Author(s):  
Faizal Soyekwo ◽  
Qiugen Zhang ◽  
Runsheng Gao ◽  
Yan Qu ◽  
Ruixue Lv ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Carbon Nanotube ◽  
Metal Ions ◽  
Surface Functionalization ◽  
Heavy Metal Ions ◽  
Composite Membranes ◽  
Carbon Nanotube Composite

Metal in situ surface functionalized PEI-g-MWCNT membranes are facilely prepared for nanofiltration of heavy metal ions in solution with high fluxes.

Thermo-kinetic investigation of heavy metal ions adsorption onto lignin considering coupled adsorption–desorption mechanisms: Modeling and experimental validation

2018 ◽  
Vol 09 (02) ◽  
pp. 1850014
Author(s):  
Farnaz Seyedvakili ◽  
Mohammad Samipoorgiri
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Individual Characteristics ◽  
Adsorption And Desorption ◽  
Isotherm Equation ◽  
Proposed Model ◽  
Isotherm And Kinetic Models ◽  
The Individual ◽  
Adsorption Desorption

A coupled adsorption–desorption thermo-kinetic model is developed incorporating both adsorption and desorption reactions. A local pseudo-equilibrium condition at the interface of adsorbent and adsorbate bulk phases was used as isotherm equation which can even be applied for multi-pollutants scenarios. The developed model is then validated using collected experimental data of heavy metal ions (Pb, Cu, Cd, Zn, and Ni). Comparisons were made for a number of isotherm and kinetic models to examine the performance of the proposed model. The developed model revealed desirable accuracy and superiority over other models in predicting the adsorption behavior and can be used for other systems of concern. The model correlates the adsorption kinetic with an [Formula: see text] value of 0.9391 and desorption kinetic with an [Formula: see text] value of 0.9383. By application of the proposed model to any available adsorption datasets, the individual characteristics of adsorption and desorption can be determined.

Competitive adsorption of heavy metal ions on carbon nanotubes and the desorption in simulated biofluids

2015 ◽  
Vol 448 ◽  
pp. 347-355 ◽  
Author(s):  
Xin Ma ◽  
Sheng-Tao Yang ◽  
Huan Tang ◽  
Yuanfang Liu ◽  
Haifang Wang
Keyword(s):  
Carbon Nanotubes ◽  
Heavy Metal ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Competitive Adsorption

scholarly journals Removal of heavy metal ions from wastewater by capacitive deionization using polypyrrole/chitosan composite electrode

2019 ◽  
Vol 37 (3-4) ◽  
pp. 205-216 ◽  
Author(s):  
Yujie Zhang ◽  
Quanqin Xue ◽  
Fei Li ◽  
Jizhe Dai
Keyword(s):  
Heavy Metal ◽  
Composite Material ◽  
Metal Ions ◽  
Metal Ion ◽  
Heavy Metal Ions ◽  
Composite Electrode ◽  
Capacitive Deionization ◽  
Metal Ion Adsorption ◽  
Adsorption Desorption ◽  
Chitosan Composite

A polypyrrole/chitosan composite material was obtained by chemical polymerization. The adsorption performance of a hot-molded polypyrrole/chitosan composite electrode was tested by adsorption/desorption experiments. Scanning electron microscopy and Fourier-transform infrared spectroscopy both showed the deposition of polypyrrole on the chitosan surface. The specific capacitance of the polypyrrole/chitosan composite was determined by cyclic voltammetry in 1.0 M KCl at 0.01 V/s as 102.96 F/g. The adsorption/desorption experiments indicated that the specific adsorption capacity of the composite for Cu2+ was 99.67 mg/g, while the removal performance for other metal ions, such as Ag+, Pb2+, and Cd2+, was good. The results of multicycle adsorption/desorption tests showed that the adsorption rate of the polypyrrole/chitosan composite electrode for Cu2+ was decreased from 56.4 to 51.4% over 10 cycles, demonstrating the stable metal-ion adsorption/desorption behavior of the composite electrode. The obtained performances show that the prepared polypyrrole/chitosan composite material is an ideal electrode material for the removal of heavy metal ions.

The adsorption of divalent heavy metal ions on (8,0) carbon nanotubes: The first-principles study

2020 ◽  
Vol 34 (32) ◽  
pp. 2050368
Author(s):  
Z. Zhu ◽  
L. An ◽  
T. Chen ◽  
X. Jia
Keyword(s):  
Carbon Nanotubes ◽  
Heavy Metal ◽  
Metal Ions ◽  
First Principles ◽  
Industrial Wastewater ◽  
Heavy Metal Ions ◽  
Density Functional ◽  
Physical Adsorption ◽  
Functional Theory ◽  
Sensing Material

In order to explore new ways to detect and remove heavy metal ions from industrial wastewater, the first-principles method based on density functional theory has been used to investigate the performance of carbon nanotubes (CNTs) in adsorbing divalent heavy metal ions which include Zn[Formula: see text], Cu[Formula: see text], Pb[Formula: see text] and Sn[Formula: see text]. Results show that the adsorption of Zn[Formula: see text] on CNTs is weak and only physical adsorption forms between them. However, for Cu[Formula: see text], Pb[Formula: see text] and Sn[Formula: see text], the final adsorption distance with CNTs is greatly decreased, and the adsorption energy and charge transfer amount with CNTs are significantly increased. In addition, the charge density of Cu[Formula: see text], Pb[Formula: see text] and Sn[Formula: see text] overlaps effectively with that of CNTs. These indicate the formation of strong chemisorption between these ions and CNTs. Therefore, CNTs could be used as a sensing material to detect and remove Cu[Formula: see text], Pb[Formula: see text] and Sn[Formula: see text] from wastewater. The research provides theoretical guidance for the application of CNTs in heavy metal ions treatment.

scholarly journals Mercury Films on Commercial Carbon Screen-Printed Devices for the Analysis of Heavy Metal Ions: a Critical Evaluation

2015 ◽  
Vol 27 (6) ◽  
pp. 1345-1349 ◽  
Author(s):  
Clara Pérez-Ràfols ◽  
Núria Serrano ◽  
José Manuel Díaz-Cruz ◽  
Cristina Ariño ◽  
Miquel Esteban
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Critical Evaluation ◽  
Commercial Carbon ◽  
Screen Printed

Triethylenetetramine modified multiwalled carbon nanotubes for the efficient preconcentration of Pb(ii), Cu(ii), Ni(ii) and Cd(ii) before FAAS detection

RSC Advances ◽  
2015 ◽  
Vol 5 (129) ◽  
pp. 106905-106911 ◽  
Author(s):  
Zeid A. ALOthman ◽  
Erkan Yilmaz ◽  
Mohamed A. Habila ◽  
Ibrahim H. Alsohaimi ◽  
Abdullah M. Aldawsari ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Heavy Metal ◽  
Solid Phase Extraction ◽  
Metal Ions ◽  
Multiwalled Carbon Nanotubes ◽  
Heavy Metal Ions ◽  
Solid Phase ◽  
Phase Extraction ◽  
Multiwalled Carbon ◽  
Efficient Adsorbent

Triethylenetetramine modified multiwalled carbon nanotubes (TETA-MWCNTs) were prepared and used as an efficient adsorbent for the solid phase extraction of heavy metal ions.

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