scholarly journals Electrochemical Behavior of Malachite Green in Aqueous Solutions of Ionic Surfactants

2013 ◽  
Vol 2013 ◽  
pp. 1-10 ◽  
Author(s):  
Mohammad Mijanur Rahman ◽  
M. Yousuf A. Mollah ◽  
M. Muhibur Rahman ◽  
Md. Abu Bin Hasan Susan
Keyword(s):  
Malachite Green ◽  
Electrochemical Behavior ◽  
Cetyltrimethylammonium Bromide ◽  
Reaction Rate ◽  
Surface Reaction ◽  
Sodium Dodecyl ◽  
Reaction Rate Constant ◽  
Carbon Electrode ◽  
Diffusion Controlled ◽  
Apparent Diffusion

Electrochemical behavior of malachite green (MG) oxalate in aqueous solution was studied in the presence of a cationic surfactant, cetyltrimethylammonium bromide (CTAB), and an anionic surfactant, sodium dodecyl sulfate (SDS) at a glassy carbon electrode using cyclic voltammetry. The electrochemical oxidation of MG has been characterized as an electrochemically irreversible diffusion-controlled process. Oxidative peak current sharply decreased with increasing SDS concentration, while a slight increase with increasing [CTAB] was apparent. The apparent diffusion coefficient, the surface reaction rate constant, and the electron transfer coefficient of MG clearly show correlation of the electrochemical behavior with the dissolved states of the surfactants. Electrochemical observations together with spectrophotometric results at varying surfactant concentrations provide evidence of interaction of MG with the surfactants to varying extent depending on the type of the surfactant and the concentration.

scholarly journals Determination of Surface Reaction Rate Constant by Using Micro-Trench Method in APCVD.

1991 ◽  
Vol 17 (6) ◽  
pp. 1175-1178 ◽  
Author(s):  
Hee Joon Kim ◽  
Yasuyuki Egashira ◽  
Hiroshi Komiyama
Keyword(s):  
Rate Constant ◽  
Reaction Rate ◽  
Surface Reaction ◽  
Reaction Rate Constant

Diffusion Controlled Effective Reaction Rate for a Surface Reaction with Orientational Selectivity

1978 ◽  
Vol 33 (11) ◽  
pp. 1243-1250
Author(s):  
Siegfried Hess
Keyword(s):  
Continued Fraction ◽  
Reaction Rate ◽  
Surface Reaction ◽  
Reaction Plane ◽  
Special Choice ◽  
Continued Fraction Expansion ◽  
Diffusion Controlled ◽  
Nonspherical Molecules ◽  
Effective Reaction ◽  
Effective Reaction Rate

The influence of the orientational selectivity of a chemical reaction on the diffusion controlled effective reaction rate is investigated theoretically for the following situation: Nonspherical molecules with random orientation are put into a chemically inert solution at a plane which is a certain distance away from the parallel reaction plane. The reaction frequency at the surface shall depend on the orientation of the figure axis of a molecule relative to the normal of the reaction plane. With a special choice for the orientational dependence of the surface reaction, a continued fraction expansion is derived for the diffusion controlled effective reaction rate. This quantity is discussed and displayed graphically as function of the relevant parameters.

Photochemical reaction of superoxide radicals with 1-naphthol

2021 ◽  
Author(s):  
Ying Liu ◽  
Mengyu Zhu ◽  
Yadong Hu ◽  
Yijun Zhao ◽  
Chengzhu Zhu
Keyword(s):  
Photochemical Reaction ◽  
Reaction Rate ◽  
Surface Reaction ◽  
Atmospheric Model ◽  
Bulk Water ◽  
Reaction Rate Constant ◽  
Photochemical Reactions ◽  
Order Reaction ◽  
Reaction Pathways ◽  
Second Order Reaction

he photochemical reactions between 1-naphthol (1-NP) and superoxide anion radical (O2•−) were investigated in detail by using 365 nm UV irradiation. The results showed that the conversion rate of 1-naphthol decreased with the increase of the initial concentration of 1-naphthol, while the raising pH and riboflavin concentration accelerated the photochemical reaction. The second-order reaction rate constant was estimated to be (3.64 ± 0.17) × 108 L mol−1 s−1. The major photolysis products identified by using gas chromatography-mass spectrum (GC-MS) were 1, 4-naphquinone and 2, 3-epoxyresin-2, 3-dihydro-1, 4-naphquinone, and their reaction pathways were also discussed. An atmospheric model showed that both bulk water reaction and heterogeneous surface reaction deserved attentions in atmospheric aqueous chemistry.

scholarly journals Determination of exothermic batch reactor specific model parameters

2019 ◽  
Vol 292 ◽  
pp. 01063
Author(s):  
Lubomír Macků
Keyword(s):  
Rate Constant ◽  
Reaction Rate ◽  
Batch Reactor ◽  
Specific Model ◽  
Reaction Rate Constant ◽  
Order Reaction ◽  
First Order Reaction ◽  
Model Parameters ◽  
Reactor Model ◽  
First Order

An alternative method of determining exothermic reactor model parameters which include first order reaction rate constant is described in this paper. The method is based on known in reactor temperature development and is suitable for processes with changing quality of input substances. This method allows us to evaluate the reaction substances composition change and is also capable of the reaction rate constant (parameters of the Arrhenius equation) determination. Method can be used in exothermic batch or semi- batch reactors running processes based on the first order reaction. An example of such process is given here and the problem is shown on its mathematical model with the help of simulations.

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