Electrochemical properties of the 2-mercaptohydroquinone monolayer on a gold electrode. Effect of solution pH, adsorption time and concentration of the modifying solution

Sucrose sensor has been made by deposited the active materials on the surface of gold electrode. The active materials, i.e. polyaniline (PANI), invertase and gold nanoparticles, were deposited step by step. Aniline polymerization were conducted electrochemically at potential -500 to 1000 mV using voltammetry method with sweep rate 50 mV/s for 20 cycles in HCl solution pH 1.5. The modified electrode obtained was immersed in invertase 1 M phosphate buffer solution pH 6. The invertase trapping in polyaniline was performed using the same condition as aniline polymerization. Then, gold nanoparticles were deposited on the polyaniline-invertase modified gold electrode using Layer by Layer (LbL) technique. The polyaniline-invertase-gold nanoparticles modified gold electrode obtained was used to measure sucrose solution. Electrochemical signal of polyaniline (PANI)-invertase-gold nanoparticles modified gold electrode is increase with sucrose concentration. The sensitivity and detection limit of the electrode are 0.4657 µA mm-2 mM-1 and 9 µM, respectively. No electrochemical interference signals from fructose and glucose have been observed in the sucrose measurement.

Download Full-text

The Effect of Solution pH on the Oxidation of Sulfite Ions and the Formation of Oxides on the Gold Electrode

Russian Journal of Electrochemistry ◽

10.1134/s1023193519120206 ◽

2019 ◽

Vol 55 (12) ◽

pp. 1171-1185

Author(s):

A. G. Zelinskii ◽

O. N. Novgorodtseva

Keyword(s):

Gold Electrode ◽

Solution Ph ◽

Sulfite Ions

Download Full-text

Electro-oxidation of captopril at a gold electrode and its determination in pharmaceuticals and human fluids

Analytical Methods ◽

10.1039/c5ay01619c ◽

2015 ◽

Vol 7 (20) ◽

pp. 8673-8682 ◽

Cited By ~ 36

Author(s):

Nagaraj P. Shetti ◽

Shweta J. Malode ◽

Sharanappa T. Nandibewoor

Keyword(s):

Gold Electrode ◽

Phosphate Buffer Solution ◽

Differential Pulse ◽

Chemical Parameters ◽

Buffer Solution ◽

Solution Ph ◽

Physico Chemical ◽

Electro Oxidation ◽

Pulse Voltammetry ◽

Human Fluids

Gold electrode was used for the oxidation of captopril in phosphate buffer solution pH 3.6 to study the influence of several physico-chemical parameters like potential, scan rate, pH and concentration by cyclic, linear sweep and differential pulse voltammetry.

Download Full-text

Preparation and electrochemical properties of SAM of alkanethiols functionalized with 2-aza[3]ferrocenophane on gold electrode

Journal of Organometallic Chemistry ◽

10.1016/j.jorganchem.2006.09.053 ◽

2006 ◽

Vol 691 (26) ◽

pp. 5935-5945 ◽

Cited By ~ 4

Author(s):

Masaki Horie ◽

Tatsuaki Sakano ◽

Kohtaro Osakada

Keyword(s):

Electrochemical Properties ◽

Gold Electrode

Download Full-text

Research on Influence Factors of Bamboo Charcoal Adsorb Ammonia Nitrogen in Wastewater

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.356-360.493 ◽

2011 ◽

Vol 356-360 ◽

pp. 493-497 ◽

Cited By ~ 1

Author(s):

Zong Ning Li ◽

Zong Qiang Zhu ◽

Mei Na Liang ◽

Hong Dong Qin ◽

Yi Nian Zhu

Keyword(s):

Ph Value ◽

Influence Factors ◽

Ammonia Nitrogen ◽

Bamboo Charcoal ◽

Solution Ph ◽

Adsorption Ability ◽

Adsorption Time ◽

Initial Concentration ◽

Adsorption Temperature ◽

Better Than

The influences of adsorption temperature, adsorption time, dosing quantity, adsorption environment pH value, initial concentration and bamboo charcoal type on adsorption of bamboo charcoal adsorb ammonia nitrogen in wastewater are studied. The result shows that the maximum adsorption values are 1.1715 mg/g and 0.9115 mg/g respectively at 25°C and 40°C. Bamboo charcoal can easily absorb ammonia nitrogen at low temperature condition. 180 min is a suitable adsorption time. Increasing bamboo charcoal dosing quantity is helpful to improve efficiencies of ammonia nitrogen removal in wastewater, but the adsorption capacity is declining as bamboo charcoal dosing quantity increasing. Solution pH value has a great impact on the adsorbed amount, the adsorbed effect in alkaline solution is much better than in acid one’s. The adsorption ability of the moderate temperature bamboo charcoal is higher than the high temperature one’s.

Download Full-text

Removal of Nickel Ions from Aqueous Solutions by 2-Hydroxyethyl Acrylate/Itaconic Acid Hydrogels Optimized with Response Surface Methodology

Gels ◽

10.3390/gels7040225 ◽

2021 ◽

Vol 7 (4) ◽

pp. 225

Author(s):

Katarina Antić ◽

Antonije Onjia ◽

Dana Vasiljević-Radović ◽

Zlate Veličković ◽

Simonida Lj. Tomić

Keyword(s):

Response Surface Methodology ◽

Response Surface ◽

Itaconic Acid ◽

Water Solution ◽

Isotherm Models ◽

Order Kinetic ◽

Solution Ph ◽

Nickel Ions ◽

Adsorption Time ◽

Before And After

The adsorption of Ni2+ ions from water solutions by using hydrogels based on 2-hydroxyethyl acrylate (HEA) and itaconic acid (IA) was studied. Hydrogel synthesis was optimized with response surface methodology (RSM). The hydrogel with the best adsorption capacity towards Ni2+ ions was chosen for further experiments. The hydrogel was characterized by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and atomic force microscopy (AFM) analysis before and after the adsorption of Ni2+ ions. Batch equilibrium experiments were conducted to investigate the influence of solution pH, hydrogel weight, ionic strength, adsorption time, temperature and initial concentration of nickel ions on the adsorption. Time-dependent adsorption fitted the best to the pseudo-second-order kinetic model. A thermodynamic study revealed that the adsorption was an exothermic and non-spontaneous process. Five isotherm models were studied, and the best fit was obtained with the Redlich–Peterson model. Consecutive adsorption/desorption studies indicated that the HEA/IA hydrogel can be efficiently used as a sorbent for the removal of Ni2+ ions from the water solution. This study develops a potential adsorbent for the effective removal of trace nickel ions.

Download Full-text