scholarly journals Electro Polymerization of o-Phenylenediamine Using Palladium Nanoparticles Coated Fabricated TiO2 Nanotubes Modified Glassy Carbon Electrode

2019 ◽  
Vol 31 (10) ◽  
pp. 2229-2232
Author(s):  
M. Alexander ◽  
R.A. Kalaivani ◽  
V. Sriraman ◽  
U. Senthilkumar
Keyword(s):  
Tio2 Nanoparticles ◽  
Glassy Carbon ◽  
Electrochemical Polymerization ◽  
Chemical Reduction ◽  
Chemical Deposition ◽  
Pd Nanoparticles ◽  
Modified Glassy Carbon Electrode ◽  
Chemical Reduction Method ◽  
Chemical Deposition Method ◽  
Ft Ir

Fabricated titanate nanotubes (f-TNT) are prepared by chemical deposition method using linen fiber. The f-TNTs is fabricated by TiO2 nanoparticles, the each TiO2 nanoparticles diameter has 80-100 nm in range. The Pd0 nanoparticle was coated on the surface of the f-TNT by chemical reduction method, using NaBH4 as reducing agent. The prepared Pd/f-TNTs characterized by FT-IR, FE-SEM and HRTEM, the result shows that the f-TNT diameter is 1500 nm and Pd nanoparticles range in 20-50 nm. The Pd/f-TNT nanocomposite modified glassy carbon (GC) electrode shows quasi irreversible redox behaviours in cyclic voltammeter. Those Pd/f-TNTs modified electrode is utilized for electrochemical polymerization of o-phenylenediamine in acid medium.

Preparation of Pd@Gr Composite Materials and Research on Catalytic Performance

2019 ◽  
Vol 944 ◽  
pp. 671-677
Author(s):  
Jin Feng Leng ◽  
Kang Wang ◽  
Chang Peng Xia
Keyword(s):  
Reduction Method ◽  
Chemical Reduction ◽  
Great Influence ◽  
Pd Nanoparticles ◽  
Catalytic Performance ◽  
Chemical Oxidation ◽  
Chemical Reduction Method ◽  
Graphene Surface ◽  
Oxidation Reduction

In this work, the preparation of graphene by chemical oxidation reduction method and a series of chemical reactions to get graphene oxide, with the preparation of graphene composites by simply chemical reduction method for the preparation of palladium/graphene composites. Through the chemical reduction method, the small size of Pd nanoparticles is acquired by controlling the content of reducing agent. The Pd nanoparticles on graphene surface is 10nm size and evenly distributed. Pd2+ adsorption on graphene surface and in situ were partially reduced to Pd to Pd2+ nanoparticles by the reducibility of graphene. In the process, the graphene was reduced to graphene and the final compound was thinner and more transparent than the pre-experiment oxide. The oxygen-containing functional groups on the surface of the graphene have influence to the nucleation and growth of metal nanoparticles and KI can control the morphology and size of nanoparticles. The particle size and dispersion uniformity have great influence on the catalytic performance of composites, the smaller particles have better catalytic performance. Keywords:palladium, graphene composites, nanoparticles

Production of Nanosilica from Iron Tailing and Characterization

2011 ◽  
Vol 295-297 ◽  
pp. 282-285
Author(s):  
Feng Feng Li ◽  
Ming Xi Zhang ◽  
Yi Shen ◽  
Du Jiao ◽  
Gui Qin Hou ◽  
...  
Keyword(s):  
Thermal Analysis ◽  
High Temperature ◽  
Silicon Dioxide ◽  
Chemical Deposition ◽  
Deposition Method ◽  
Analysis Techniques ◽  
Chemical Deposition Method ◽  
Ft Ir ◽  
Thermal Analysis Techniques ◽  
Amorphous Matter

Nanosilica was extracted from iron tailing by the chemical deposition method, involving pickling, filters washing, alkali dissolving of pickling dregs in high temperature, precipitating silica controlled by diluted acid and so on. The product has been studied by SEM, XRD, FT-IR, and thermal analysis techniques, etc. These study shows that the nanosilica is a kind of amorphous matter consists of hydrous silicon dioxide (97.076%) with small amount of sodium and aluminum trapped inside the Si–O network. The diameter of globular silica particles is 30-50 nm.

scholarly journals Electrocatalytic Glucose Oxidation at Coral-Like Pd/C3N4-C Nanocomposites in Alkaline Media

Catalysts ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 440 ◽  
Author(s):  
Guang Dong ◽  
Qingqing Lu ◽  
Haihui Jiang ◽  
Chunfang Li ◽  
Yingying Gong ◽  
...  
Keyword(s):  
Carbon Nitride ◽  
Reduction Method ◽  
Chemical Reduction ◽  
High Sensitivity ◽  
Pd Nanoparticles ◽  
Glucose Sensing ◽  
Alkaline Media ◽  
Chemical Reduction Method ◽  
One Pot ◽  
Glucose Electrooxidation

Porous coral-like Pd/C3N4-C nanocomposites are fabricated by a simple one-pot chemical reduction method. Their electrocatalytic performance is ~50% higher than a carbon-loaded palladium electrocatalyst (Pd/C) in alkaline media. This confirms that the glucose electrooxidation and sensing performance of a Pd/C can be improved by the synergy of graphitic carbon nitride (C3N4), though C3N4 exhibits poor electrical conductivity. Compared to Pd/C, the size of Pd nanoparticles in Pd/C3N4-C decreases. As a result, the activity of Pd/C3N4-C is enhanced due to the higher dispersion and the synergistic effect. Pd/C3N4-C presents a rapid response and high sensitivity to glucose. The sensitivity for glucose sensing at Pd/C3N4-C is 3.3 times that of at Pd/C in the range of 0.001–10 mM. In the lower range of 0.001–1 mM, the sensitivity at Pd/C3N4-C is ~10 times greater than Pd/C.

scholarly journals Surfactant-dependant thermally induced nonlinear optical properties of l-ascorbic acid-stabilized colloidal GNPs and GNP–PVP thin films

RSC Advances ◽  
2019 ◽  
Vol 9 (27) ◽  
pp. 15502-15512 ◽  
Author(s):  
A. L. Sunatkari ◽  
S. S. Talwatkar ◽  
Y. S. Tamgadge ◽  
G. G. Muley
Keyword(s):  
Thin Films ◽  
Ascorbic Acid ◽  
Nonlinear Optical ◽  
Reduction Method ◽  
Chemical Reduction ◽  
Chemical Reduction Method ◽  
Thermally Induced ◽  
Vis Spectroscopy ◽  
Ft Ir ◽  
Ft Ir Spectroscopy

Gold nanoparticle (GNP) colloids stabilized with various concentrations of l-ascorbic acid were synthesized by the chemical reduction method and characterized by UV-Vis spectroscopy, XRD, FT-IR spectroscopy and TEM.

Highly Improved Electrooxidation of Captopril on Copper Hexacyanoferrate/Ordered Mesoporous Carbon-Modified Glassy Carbon Electrode

2014 ◽  
Vol 67 (6) ◽  
pp. 851 ◽  
Author(s):  
Shengjun Lu ◽  
Pan Lu ◽  
Cheng Li ◽  
Caihong Wang ◽  
Jie Yu
Keyword(s):  
Glassy Carbon Electrode ◽  
Glassy Carbon ◽  
Mesoporous Carbon ◽  
Electrochemical Polymerization ◽  
Ordered Mesoporous Carbon ◽  
Polymerization Process ◽  
Carbon Electrode ◽  
Modified Glassy Carbon Electrode ◽  
Copper Hexacyanoferrate ◽  
Ordered Mesoporous

Using an electrochemical polymerization process, a copper hexacyanoferrate/ordered mesoporous carbon-modified glassy carbon electrode (CuHCF/OMC/GCE) was prepared. The performance of CuHCF/OMC was compared with that of CuHCF and the properties of the new material were improved. A sensor for sensitive detection of captopril was developed based on CuHCF/OMC-modified glassy carbon electrode. The composition and morphology of the as-prepared CuHCF/OMC products were characterized by energy-dispersive X-ray spectroscopy and scanning electron microscopy. The electrochemical behaviour and electrocatalytic performance of the CuHCF/OMC-modified glassy carbon electrode towards the oxidation of captopril were evaluated by cyclic voltammetry. Results showed that the CuHCF/OMC-modified electrode exhibits two well-defined redox peaks. The linear range for the detection of captopril was from 1.0 × 10–5 to 2.7 × 10–3 M, with a correlation coefficient of 0.999, and the detection limit was 1.2 × 10–6 M based on a signal-to-noise ratio of 3.

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