Potentiostatic Electrochemical Preparation of Bismuth Nanoribbons and its Application in Biologically Poisoning Lead and Cadmium Heavy Metal Ions Detection

2015 ◽  
Vol 27 (10) ◽  
pp. 2341-2346 ◽  
Author(s):  
Rajkumar Devasenathipathy ◽  
Raj Karthik ◽  
Shen-Ming Chen ◽  
Veerappan Mani ◽  
V. S. Vasantha ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Electrochemical Preparation ◽  
Lead And Cadmium ◽  
Metal Ions Detection

Chitosan/PAA based fiber-optic interferometric sensor for heavy metal ions detection

2016 ◽  
Vol 233 ◽  
pp. 31-38 ◽  
Author(s):  
R. Raghunandhan ◽  
L.H. Chen ◽  
H.Y. Long ◽  
L.L. Leam ◽  
P.L. So ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Fiber Optic ◽  
Interferometric Sensor ◽  
Metal Ions Detection

scholarly journals Functionalization of PET Track-Etched Membranes by UV-Induced Graft (co)Polymerization for Detection of Heavy Metal Ions in Water

Polymers ◽  
2019 ◽  
Vol 11 (11) ◽  
pp. 1876 ◽  
Author(s):  
Maxim V. Zdorovets ◽  
Ilya V. Korolkov ◽  
Arman B. Yeszhanov ◽  
Yevgeniy G. Gorin
Keyword(s):  
Water Quality ◽  
Heavy Metal ◽  
Metal Ions ◽  
Photoelectron Spectroscopy ◽  
Heavy Metal Ions ◽  
Anodic Stripping Voltammetry ◽  
Stripping Voltammetry ◽  
Water Quality Monitoring ◽  
Lead And Cadmium ◽  
Platinum Layer

Nowadays, water quality monitoring is an essential task since environmental contamination and human exposure to heavy metals increased. Sensors that are able to detect ever lower concentrations of heavy metal ions with greater accuracy and speed are needed to effectively monitor water quality and prevent poisoning. This article shows studies of the modification of flexible track-etched membranes as the basis for the sensor with various polymers and their influence on the accuracy of detection of copper, cadmium, and lead ions in water. We report the UV-induced graft (co)polymerization of acrylic acid (AA) and 4-vinylpyridine (4-VPy) on poly(ethylene terephthalate) track-etched membrane (PET TeMs) and use them after platinum layer sputtering in square wave anodic stripping voltammetry (SW-ASV) for detection of Cu2+, Cd2+, and Pb2+. Optimal conditions leading to functionalization of the surface and retention of the pore structure were found. Modified membranes were characterized by SEM, FTIR, X-ray photoelectron spectroscopy (XPS) and colorimetric analysis. The dependence of the modification method on the sensitivity of the sensor was shown. Membrane modified with polyacrylic acid (PET TeMs-g-PAA), poly(4-vinylpyridine) (PET TeMs-g-P4VPy), and their copolymer (PET TeMs-g-P4VPy/PAA) with average grafting yield of 3% have been found to be sensitive to µg/L concentration of copper, lead, and cadmium ions. Limits of detection (LOD) for sensors based on PET TeMs-g-PAA are 2.22, 1.05, and 2.53 µg/L for Cu2+, Pb2+, and Cd2+, respectively. LODs for sensors based on PET TeMs-g-P4VPy are 5.23 µg/L (Cu2+), 1.78 µg/L (Pb2+), and 3.64 µg/L (Cd2+) µg/L. PET TeMs-g-P4VPy/PAA electrodes are found to be sensitive with LODs of 0.74 µg/L(Cu2+), 1.13 µg/L (Pb2+), and 2.07 µg/L(Cd2+). Thus, it was shown that the modification of membranes by copolymers with carboxylic and amino groups leads to more accurate detection of heavy metal ions, associated with the formation of more stable complexes.

scholarly journals Sorption performance of cysteine-modified bentonite in heavy metals uptake

2009 ◽  
Vol 74 (7) ◽  
pp. 833-843 ◽  
Author(s):  
Hossein Faghihian ◽  
Massoud Nejati-Yazdinejad
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Metal Binding ◽  
Heavy Metal Ions ◽  
Sorption Isotherms ◽  
Local Clay ◽  
Lead And Cadmium ◽  
Sorption Parameters ◽  
Thiol Ligand ◽  
Heavy Metals Uptake

A local clay, bentonite (N-Ben), was modified by the biologically-based ligand, cysteine (Cys), through a simple sorption technique. The modified sorbent (Cys-Ben) demonstrated affinity for soft and moderately soft heavy metal ions (HMI), such as Cd(II) and Pb(II), probably as a result of the soft basic character of the thiol ligand side chains. The resulting modified system was effective for metal binding with capacities of 0.503 and 0.525 mmol g-1, for Pb(II) and Cd(II), respectively. Comparative batch experiments were performed for removing lead and cadmium from aqueous solutions. The sorption parameters were derived from a Langmuir fit to the sorption isotherms of the studied ions. The study showed that the sorption capacity of Cys-Ben was higher than that of N-Ben for these ions. The effect of pH was examined over the range 2.0-6.0. The sorption capacities of Cys-Ben showed that this modified clay is a good sorbent for the examined heavy metal ions.

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