scholarly journals Ion-Imprinted Electrochemical Sensor Based on Copper Nanoparticles-Polyaniline Matrix for Nitrate Detection

2019 ◽  
Vol 2019 ◽  
pp. 1-14 ◽  
Author(s):  
Houda Essousi ◽  
Houcine Barhoumi ◽  
Malek Bibani ◽  
Nadia Ktari ◽  
Frank Wendler ◽  
...  
Keyword(s):  
Electrochemical Sensor ◽  
Copper Nanoparticles ◽  
Chemical Sensor ◽  
Ph Value ◽  
Linear Sweep Voltammetry ◽  
Electrochemical Analysis ◽  
Nitrate Sensor ◽  
Ion Imprinted ◽  
Nitrate Determination ◽  
Uv Visible

This study reports a new chemical sensor based on ion-imprinted polymer matrix using copper nanoparticles-polyaniline nanocomposite (IIP-Cu-NPs/PANI). This sensor was prepared by electropolymerization using aniline as a functional monomer and nitrate as template onto the copper nanoparticles-modified glassy carbon (GC) electrode surface. Both ion-imprinted (IIP) and nonimprinted (NIP) electrochemical sensor surfaces were evaluated using UV-Visible spectrometry and scanning electron microscopy (SEM). The electrochemical analysis was made via cyclic voltammetry (CV), linear sweep voltammetry (LSV), and impedance spectroscopy (IS). Throughout this study various analytical parameters, such as scan rate, pH value, concentration of monomer and template, and electropolymerization cycles, were optimized. Under the optimum conditions, the peaks current of nitrate was linear to its concentration in the range of 1μM-0.1M with a detection limit of 31μM and 5μM by EIS and LSV. The developed imprinted nitrate sensor was successfully applied for nitrate determination in different real water samples with acceptable recovery rates.

Gelatin as an ecofriendly natural polymer for preparing colloidal silver@gold nanobranches

2016 ◽  
Vol 5 (5) ◽  
Author(s):  
Phuong Phong Nguyen Thi ◽  
Dai Hai Nguyen
Keyword(s):  
Ph Value ◽  
Component Ratio ◽  
X Ray Diffraction ◽  
Ag Nps ◽  
Au Nps ◽  
X Ray ◽  
Transmission Electron ◽  
Uv Visible ◽  
The Stability ◽  
Maximum Absorption Wavelength

AbstractWe report star-shaped silver@gold (Ag@Au) nanoparticles (NPs) in gelatin suspensions for the purpose of enhancing the stability of Ag@Au NPs. In this case, Ag NPs were designed as nucleating agents, whereas gelatin was used as a protecting agent for Au development. Especially, variable gelatin concentrations were also prepared to explore its ability to increase the stability of Ag@Au NPs. The obtained samples were then characterized by UV-visible spectroscopy, transmission electron spectroscopy (TEM), X-ray diffraction, and Fourier transform infrared spectroscopy. The maximum absorption wavelength of all samples (566–580 nm) indicated that branched Ag@Au@gelatin NPs were successfully synthesized. In addition, our TEM results revealed that the size of branched Ag@Au@gelatin NPs was found to be between 20 and 45 nm as influenced by the component ratio and the pH value. These results can provide valuable insights into the improvement of Ag@Au NP stability in the presence of gelatin.

Electrodeposition of Copper Nano-Clusters at a Platinum Microelectrode for Nitrate Determination

2011 ◽  
Vol 483 ◽  
pp. 595-599 ◽  
Author(s):  
Yang Li ◽  
Ji Zhou Sun ◽  
Chao Bian ◽  
Jian Hua Tong ◽  
Shan Hong Xia
Keyword(s):  
Cyclic Voltammetry ◽  
Linear Sweep Voltammetry ◽  
X Ray Diffraction ◽  
Effective Surface ◽  
X Ray ◽  
Nitrate Determination ◽  
Cyclic Voltammetry Method ◽  
Acidic Conditions ◽  
Surface Modified ◽  
Higher Sensitivity

Copper nano-clusters were electrodeposited onto the platinum microelectrode by cyclic voltammetry method to fabricate an electrochemical sensor for nitrate determination. The material properties and morphologies of freshly deposited copper layer were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM), respectively. Compared with the microelectrode surface modified by fixed potential deposition method, the surface modified by cyclic voltammetry electrodeposition is porous and has a larger effective surface area. The reduction of nitrate under acidic conditions (pH=2) was characterized by linear sweep voltammetry. The preliminary experimental results reveal that the microelectrode modified by cyclic voltammetry electrodeposition had higher sensitivity of 22.56 uA/mmol for nitrate detection within the concentration range from 0.1mmolL−1 to 4mmolL−1.

Electrochemical Sensor Based on Rh(III) Ion-Imprinted Polymer as a New Modifying Agent for Rhodium Determination

2018 ◽  
Vol 18 (5) ◽  
pp. 3577-3584 ◽  
Author(s):  
Huiping Bai ◽  
Caiyun Xiong ◽  
Chunqiong Wang ◽  
Peng Liu ◽  
Su Dong ◽  
...  
Keyword(s):  
Electrochemical Sensor ◽  
Ion Imprinted Polymer ◽  
Imprinted Polymer ◽  
Modifying Agent ◽  
Ion Imprinted

scholarly journals Effect of the Acidic and Alkaline Solutions on K2CrO4 and K2Cr2O7 by Ultraviolet and Visible Measurement

2019 ◽  
Vol 30 (1) ◽  
pp. 221
Author(s):  
Mohammad Radi Mohammad ◽  
Hasanain Saad Azeez
Keyword(s):  
Ph Value ◽  
Red Shift ◽  
Alkaline Solutions ◽  
Visible Spectroscopy ◽  
Solution Ph ◽  
Effect Of Ph ◽  
Ph Values ◽  
Uv Visible

In this work different amount of acidic (HCl) and alkaline (NaOH) solutions were added to stoke solutions of K2CrO4 and K2Cr2O7 to show the effect of pH values on their spectra. The results of UV-Visible spectroscopy shows that, the Changing of solution pH value when drops of HCl were added led to shift wavelength of K2CrO4 spectrum while no change has been occurred in K2Cr2O7 spectrum. However, Changing PH values solution by adding drops of NaOH led to change in wavelength red shift for K2Cr2O7 while no changes has been occurred in spectrum of K2CrO4.

scholarly journals Green Synthesis of Copper Nanoparticles Using Mitragyna Parvifolia Bark Extract and its Antimicrobial Study

2019 ◽  
pp. 26-33
Author(s):  
Shaileshkumar C Kotval ◽  
Kokila A Parmar
Keyword(s):  
Antimicrobial Activity ◽  
Green Synthesis ◽  
Copper Nanoparticles ◽  
Color Change ◽  
Bark Extract ◽  
Gram Positive ◽  
Bending Vibrations ◽  
Gram Negative ◽  
Gram Positive Bacteria ◽  
Uv Visible

In this study, Mitragyna parvifolia plant bark an aqueous extract which provides cost-effective, eco-friendly process, less time consuming, an environmentally benign, easy and proficient way for the synthesis of copper nanoparticles. Mitragyna parvifolia plant bark was collected from virpur hills forest area. The Mitragyna parvifolia plant bark extract was prepared in de-ionised water and used for the green synthesis of copper nanoparticles. The color change of the solution dark brown from pale yellow colored, this confirms that there is a formation of copper nanoparticles. The green synthesised copper nanoparticles were characterized by UV-Visible spectroscopy, FT-IR, XRD, SEM, TEM and their antimicrobial activity was investigated. From UV-Visible spectrophotometer result was confirmed the reduction of copper sulphate to copper nanoparticles. FTIR analysis was confirmed the bending vibrations and stretching bonds present in the sample. Spherical shape was finding out by XRD and the size of the particle was analyzed with the help of Scanning Electron Microscopy. The antibacterial activity experiment against Escherichia coli gram-negative and Bacillus subtilis gram-positive bacteria by agar well method and the maximum zone of inhibition was higher in gram-positive bacteria compared to gram-negative bacteria. The green synthesised copper nanoparticles proved to be potential candidates for medical application antimicrobial activity is highly essential.

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