Effects of nonionic, cationic, and anionic micelles on the kinetics of the complexation reaction of nickel (II) with pyridine-2-azo-p-dimethylaniline

1986 ◽  
Vol 18 (6) ◽  
pp. 609-621 ◽  
Author(s):  
Antonio I. Carbone ◽  
F. Paolo Cavasino ◽  
Emanuele Di Dio ◽  
Carmelo Sbriziolo
Keyword(s):  
Complexation Reaction ◽  
Anionic Micelles ◽  
Kinetics Of

Micellar catalysis in mixed anionic/cationic surfactant systems

1994 ◽  
Vol 72 (12) ◽  
pp. 2443-2446 ◽  
Author(s):  
Yvette L. Favaro ◽  
Vincent C. Reinsborough
Keyword(s):  
Cationic Surfactant ◽  
Sodium Dodecylsulfate ◽  
Kinetic Studies ◽  
Micellar Catalysis ◽  
Stopped Flow ◽  
Complexation Reaction ◽  
Dodecyltrimethylammonium Bromide ◽  
Micellar Solutions ◽  
Decyltrimethylammonium Bromide ◽  
Anionic Micelles

Dye solubility and stopped-flow kinetic studies were conducted in sodium dodecylsulfate/dodecyltrimethylammonium bromide and sodium dodecylsulfate/decyltrimethylammonium bromide micellar solutions with excess anionic surfactant. The enhanced rate in the presence of anionic micelles of the Ni2+(aq)/pyridine-2-azo-p-dimethylaniline (PADA) complexation reaction was used as a probe of the mixed micellar situation. PADA solubilities and the kinetic parameters derived through the Robinson model for micellar catalysis were consistent with a complete incorporation of the cationic surfactant into the sodium dodecylsulfate micelles.

Thermodynamics and kinetics of solubilization of naphthalene into anionic micelles

2000 ◽  
Vol 332 (3-4) ◽  
pp. 265-270 ◽  
Author(s):  
N. Yoshida ◽  
M. Takechi ◽  
T. Asano ◽  
Y. Moroi ◽  
R. Humphry-Baker ◽  
...  
Keyword(s):  
Thermodynamics And Kinetics ◽  
Anionic Micelles ◽  
Kinetics Of

scholarly journals Effect of iron treatment and equilibrium pH on the kinetics of removal of some substituted phenols from synthetic wastewater onto Nostoc sp. biomass

2020 ◽  
Vol 81 (10) ◽  
pp. 2140-2151
Author(s):  
Namrata Gururani ◽  
Devesh Bhatt ◽  
Anjana Srivastava ◽  
Prakash Chandra Srivastava
Keyword(s):  
Cost Effective ◽  
Synthetic Wastewater ◽  
Complexation Reaction ◽  
Substituted Phenols ◽  
Cost Effective Method ◽  
Iron Treatment ◽  
Phenolic Group ◽  
Pseudo Second Order ◽  
The Fourier Transform ◽  
Kinetics Of

Abstract Substituted phenols, such as 4-Nitrophenol (4-NP) and 2,4-Dichlorophenol (2,4-DCP), that are present in industrial wastewaters are considered as priority pollutants due to their toxic effects. Their removal by biosorption presents an eco-friendly, cost-effective method. The kinetics of removal of 4-NP and 2,4-DCP by untreated Nostoc sp. (UNB) and Fe-treated Nostoc sp. biomass (FNB) were studied at three different pH (4.0, 7.0 and 9.0). The highest sorption of both phenols (2.28 mg 4-NP and 1.51 mg 2,4-DCP g−1) coupled with the lowest cumulative percentage desorption was recorded with FNB at pH 7.0. The sorption of both phenols by UNB and FNB was best accounted for by pseudo-second-order kinetics. Compared to UNB, FNB had significantly higher equilibrium sorption capacities for both phenols at all the three pH values and also higher sorption rate constants of 4-NP at pH 4 and 9 and of 2,4-DCP at pH 4 and 7. The Fourier transform infrared spectroscopy (FTIR) analysis showed that –OH and COO− groups of UNB interacted with Fe+3. The sorption of 4-NP and 2,4-DCP on UNB was likely through H-bonding/structural cation bridging with the phenolic group, while their sorption onto FNB appeared to be a complexation reaction with very low reversibility.

scholarly journals Kinetics and Mechanism of Paracetamol Oxidation by Chromium(VI) in Absence and Presence of Manganese(II) and Sodiumdodecyl Sulphate

2007 ◽  
Vol 2007 ◽  
pp. 1-5 ◽  
Author(s):  
Mohammed Ilyas ◽  
Maqsood Ahmad Malik ◽  
Syed Misbah Zahoor Andrabi ◽  
Zaheer Khan
Keyword(s):  
Catalytic Effect ◽  
Complexing Agents ◽  
First Order ◽  
Chromium Vi ◽  
Optimum Reaction ◽  
Fast Kinetic ◽  
Kinetic Spectrophotometric ◽  
Anionic Micelles ◽  
Kinetics Of

The kinetics of paracetamol oxidation are first order each in [paracetamol] and [HClO4]. The kinetic study shows that the oxidation proceeds in two steps. The effects of anionic micelles of sodiumdodecyl sulphate (SDS) and complexing agents (ethylenediammine tetraacetic acid (EDTA) and 2,2′-bipyridyl (bpy)) were also studied. Fast kinetic spectrophotometric method has been described for the determination of paracetamol. The method is based on the catalytic effect of manganese(II) on the oxidation of paracetamol by chromium(VI) in the presence of HClO4 (= 0.23 mol dm−3). Optimum reaction time is 4 to 6 minutes at a temperature of 30∘C. The addition of manganese(II) ions largely decreased the absorbance of chromium(VI) at 350 nm. This reaction can be utilized for the determination of paracetamol in drugs.

scholarly journals CATALYTIC ACTION OF NITROGEN-CONTAINING BASES ON KINETICS OF ZINC AND HEXA- (m-TRIFLUOROMETHYLPHENYL)BENZOPORPHYRAZINE COMPLEX FORMATION

2017 ◽  
Vol 60 (3) ◽  
pp. 36 ◽  
Author(s):  
Oleg A. Petrov ◽  
Irina N. Sadovskaya
Keyword(s):  
Complex Formation ◽  
Zinc Acetate ◽  
Molecular Form ◽  
Activation Parameters ◽  
Catalytic Action ◽  
Proton Acceptor ◽  
Complexation Reaction ◽  
Base Interaction ◽  
Rate Limiting Step ◽  
Kinetics Of

A complexation reaction of hexa(m-trifluoromethylphenyl)benzoporphyrazine with zinc acetate in the system “morpholine (piperidine) – benzene” was studied. Preliminary studies have shown that at concentrations of morpholine and piperidine in benzene less than 0.95 and 0.2 mol/l respectively, the reactions between hexa(m-trifluoromethylphenyl)benzoporphyrazine and zinc acetate not observed. The reaction takes place only at the range of concentrations of morpholine of 0.95 to 8.70 mol /l in benzene and at the range of concentrations of piperidine of 0.2 to 7.74 mol /l in benzene. The changes in the electronic absorption spectrum do not depend on the nature of the nitrogen-containing base, and accompanied by π - chromophore molecules from D2h to D4h symmetry increase. It was shown that complexation describes with the total kinetic equation of the third order. That is there is the first order on every reagent -hexa (m-trifluoromethylphenyl) benzoporphyrazine, zinc acetate and the base. A possible scheme of the mechanism in which the acid - base interaction of   hexa (m-trifluoromethylphenyl) benzoporphyrazine with morpholine (piperidine), leading to the H – complex formation is the rate-limiting step of the process proposed. This complex unlike molecular form posseses higher reactivity at interaction with zink cation since an expenditure of energy for breaking intracyclic NH bonds is essentially lower. It was found that rate of hexa (m-trifluoromethylphenyl) piperidin benzoporfirazina coordination by zinc is higher in system “piperidine – benzene”. At replacement of piperidine with morpholine рКа of bases decreases by a factor of about 2.5. It results in the decrease in complexation rate judging by values of k298  by a factor of ~7 on the background of constancy  of activation parameters of reaction. This fact is not surprising since less pronounced proton acceptor ability of morpholine complicates removal of intracyclic proton of NH - groups with formation of N - complex and, consequently, complicates zinc cation entrance into the coordination plane of the macrocycle.For citation:Petrov O.A., Sadovskaya I.N. Catalytic action of nitrogen-containing bases on kinetics of zinc and hexa (m-trifluorome-thylphenyl) benzoporphyrazine complex formation. Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol. 2017. V. 60. N 3. P. 36-41.

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