Surface Functionalization of Cellulose Fibers Extracted from Juncus Acutus L Plant: Application for the Adsorption of Anionic Dyes from Wastewaters

2015 ◽  
Vol 10 (1) ◽  
pp. 155892501501000 ◽  
Author(s):  
Amel El Ghali ◽  
Baouab Mohamed Hassen ◽  
Roudesli Mohamed Sadok
Keyword(s):  
Copper Ions ◽  
Activation Parameters ◽  
Cellulose Fibers ◽  
Batch Process ◽  
Anionic Dyes ◽  
Thermodynamic Activation Parameters ◽  
Juncus Acutus ◽  
Exothermic Process ◽  
Equilibrium Data ◽  
Acid Blue

New amine-functionalized adsorbent was prepared by chemical modification of cellulose fibers extracted from Juncus acutus L (Smar) plants in order to be used as chelating support for the removal of copper ions (Cu (II)). Evidence of grafting DiEthyleneTriamine (DET) onto the raw Smar fibers was provided by nitrogen analysis and Fourier Transform Infrared (FTIR) spectra study. The ability of the binary system [Cu(II)/DET-Smar] for binding Acid Blue 25 (AB25) was then investigated in batch process. Equilibrium data were analyzed by Langmuir, Freundlich and Jossens models. The obtained results reveal that the adsorption of AB25 onto [Cu (II)/DET-Smar] complex show good compliance with the Jossens isotherm. Various thermodynamic activation parameters were estimated and it was found that the adsorption was spontaneous and follows an exothermic process.

Kinetic Studies of [4n+2]π-Thermal Cyclodimerization of 1-(3-Pyridazinyl)-3-oxidopyridinium Betaines

1992 ◽  
Vol 57 (9) ◽  
pp. 1951-1959 ◽  
Author(s):  
Madlene L. Iskander ◽  
Samia A. El-Abbady ◽  
Alyaa A. Shalaby ◽  
Ahmed H. Moustafa
Keyword(s):  
Energy Gap ◽  
Activation Parameters ◽  
Kinetic Studies ◽  
Cyclic Transition ◽  
Concerted Mechanism ◽  
First Order ◽  
Thermodynamic Activation Parameters ◽  
Cyclic Transition State ◽  
Complete Dissociation ◽  
Homo Lumo

The reactivity of the base induced cyclodimerization of 1-(6-arylpyridazin-3-yl)-3-oxidopyridinium chlorides in a pericyclic process have been investigated kinetically at λ 380 nm. The reaction was found to be second order with respect to the liberated betaine and zero order with respect to the base. On the other hand dedimerization (monomer formation) was found to be first order. It was shown that dimerization is favoured at low temperature, whereas dedimerization process is favoured at relatively high temperature (ca 70 °C). Solvent effects on the reaction rate have been found to follow the order ethanol > chloroform ≈ 1,2-dichloroethane. Complete dissociation was accomplished only in 1,2-dichloroethane at ca 70 °C. The thermodynamic activation parameters have been calculated by a standard method. Thus, ∆G# has been found to be independent on substituents and solvents. The high negative values of ∆S# supports the cyclic transition state which is in favour with the concerted mechanism. MO calculations using SCF-PPP approximation method indicated low HOMO-LUMO energy gap of the investigated betaines.

scholarly journals Preparation and Characterization of Cationized Cellulose for the Removal of Anionic Dyes

2001 ◽  
Vol 19 (3) ◽  
pp. 197-210 ◽  
Author(s):  
A. Hashem ◽  
Reda M. El-Shishtawy
Keyword(s):  
Adsorption Capacity ◽  
Freundlich Isotherm ◽  
Structural Features ◽  
Isotherm Models ◽  
Acid Orange 7 ◽  
Anionic Dyes ◽  
Adsorption Parameters ◽  
Direct Blue ◽  
Equilibrium Data

The factors influencing the cationization of microcrystalline cellulose with 3-chloro-2-hydroxypropyl triethylammonium chloride in the presence of NaOH were investigated. The course of the reaction was followed by estimating the nitrogen content of the cationized product while its structural features were confirmed by IR analysis. The ability of cationized cellulose to adsorb anionic dyes, viz. Acid Orange 7, Direct Blue 75 and Direct Violet 31, was investigated at 25°C and 50°C. The equilibrium data obtained were fitted by the Langmuir and Freundlich isotherm models, allowing the corresponding adsorption parameters to be determined. The results showed that the adsorption capacity was dependent on the adsorbent, temperature, the nature of the dye and (to some extent) on van der Waals and hydrogen bonding. Cationized cellulose exhibited a much better adsorption capacity towards anionic dyes than cellulose.

scholarly journals [Copper (II)/Cellulose-Chitosan] Microspheres Complex for Dye Immobilization: Isotherm, Kinetic and Thermodynamic Analysis

2013 ◽  
Vol 8 (3) ◽  
pp. 155892501300800 ◽  
Author(s):  
Mahjoub Jabli ◽  
Faouzi Aloui ◽  
Béchir Ben Hassine
Keyword(s):  
Copper Ions ◽  
Sorption Data ◽  
Freundlich Model ◽  
Adsorption Phenomenon ◽  
Chitosan Microspheres ◽  
Chemical Structures ◽  
Adsorption Capacities ◽  
Intra Particle Diffusion ◽  
Kinetic And Thermodynamic Analysis ◽  
Acid Blue

Considered as ligands due to the presence of donor atoms in their chemical structures, and being also among the major pollutants of water, Eriochrome Black B (Erio), Calmagite (Calma) and Acid Blue 25 (AB25) were successfully immobilized on cellulose-chitosan microspheres loaded with copper ions. Prepared supports were characterized by Fourier Transform Infra-Red (FTIR) spectral study and Thermogravimetic analysis (TGA). The effect of experimental factors during dye immobilization such as pH, contact time, temperature, and initial dye concentration were studied. The experiments demonstrate that the adsorption capacities of dyes on [Cu(II)/cellulose-chitosan] are much higher than the unloaded microspheres. This indicates that these dyes can act as efficient ligands for coordinating metals already involved in [cellulose-chitosan]. At least, in the case of AB25, a 60% of difference in target removal was achieved at equilibrium. The kinetic adsorption fitted well to the intra-particle diffusion model and the corresponding rate constants were obtained. In addition, the interpretation of the equilibrium sorption data complies well with the Freundlich model. The thermodynamic parameters were also determined and the enthalpy change (ΔH&Deg;) was found to be low, between −5.93 and −20.68 Kj.mol-1, indicating that the adsorption phenomenon is exothermic and physical. A probable mechanism of the Dye/Copper(II)/cellulose-chitosan complex is also proposed.

scholarly journals [Copper (II)/Cellulose-Chitosan] Microspheres Complex for Dye Immobilization: Isotherm, Kinetic and Thermodynamic Analysis

2013 ◽  
Vol 8 (4) ◽  
pp. 155892501300800 ◽  
Author(s):  
Mahjoub Jabli ◽  
Faouzi Aloui ◽  
Béchir Ben Hassine
Keyword(s):  
Copper Ions ◽  
Sorption Data ◽  
Freundlich Model ◽  
Adsorption Phenomenon ◽  
Chitosan Microspheres ◽  
Chemical Structures ◽  
Adsorption Capacities ◽  
Intra Particle Diffusion ◽  
Kinetic And Thermodynamic Analysis ◽  
Acid Blue

Considered as ligands due to the presence of donor atoms in their chemical structures, and being also among the major pollutants of water, Eriochrome Black B (Erio), Calmagite (Calma) and Acid Blue 25 (AB25) were successfully immobilized on cellulose-chitosan microspheres loaded with copper ions. Prepared supports were characterized by Fourier Transform Infra-Red (FTIR) spectral study and Thermogravimetic analysis (TGA). The effect of experimental factors during dye immobilization such as pH, contact time, temperature, and initial dye concentration were studied. The experiments demonstrate that the adsorption capacities of dyes on [Cu(II)/cellulose-chitosan] are much higher than the unloaded microspheres. This indicates that these dyes can act as efficient ligands for coordinating metals already involved in [cellulose-chitosan]. At least, in the case of AB25, a 60% of difference in target removal was achieved at equilibrium. The kinetic adsorption fitted well to the intra-particle diffusion model and the corresponding rate constants were obtained. In addition, the interpretation of the equilibrium sorption data complies well with the Freundlich model. The thermodynamic parameters were also determined and the enthalpy change (ΔH°) was found to be low, between −5.93 and −20.68 Kj.mol-1, indicating that the adsorption phenomenon is exothermic and physical. A probable mechanism of the Dye/Copper(II)/cellulose-chitosan complex is also proposed.

Adsorption of Copper Ions from Wastewater by Carboxymethylcellulose Sulfate

2011 ◽  
Vol 393-395 ◽  
pp. 1098-1101 ◽  
Author(s):  
Yan Yu ◽  
Feng Yuan Huang
Keyword(s):  
Contact Time ◽  
Copper Concentration ◽  
Adsorption Process ◽  
Ph Value ◽  
Copper Ions ◽  
Adsorption Capacities ◽  
Monolayer Adsorption ◽  
Optimum Ph ◽  
Equilibrium Data ◽  
Langmuir Isotherm Model

In the present paper, the ability of carboxymethylcellulose sulfate (CMC-S) for Cu(II) removal was studied. The influence of factors, such as the pH value, the initial copper concentrations, and the contact time, were investigated in detail. Atomic absorption spectrophotometer was applied to determined the concentration of Cu(II). The results showed that the adsorption process was strongly dependent on the pH value and the initial copper concentration. The optimum pH value was in the range of 6-7. The theoretical adsorption capacities for Cu(II) was 127.7 mg/g. The equilibrium data was well fitted to the Langmuir isotherm model at 25°C, which can be explained as a monolayer adsorption.

Adsorption of Methylene Blue on Modified Bentonite

2013 ◽  
Vol 726-731 ◽  
pp. 2380-2383
Author(s):  
Li Xia Li ◽  
Xin Dong Zhai
Keyword(s):  
Methylene Blue ◽  
Aqueous Solutions ◽  
Adsorption Kinetics ◽  
Freundlich Isotherm ◽  
Batch Process ◽  
Experimental Results ◽  
Order Model ◽  
Modified Bentonite ◽  
Equilibrium Data ◽  
Pseudo Second Order

Modified bentonite was used as adsorbent for the methylene blue adsorption in a batch process. Experimental results show that the adsorption kinetics is well described by pseudo-second-order model and the equilibrium data was better represented by the Freundlich isotherm model. The results revealed that the modified bentonite has the potential to be used as a good adsorbent for the removal of methylene blue from aqueous solutions.

Kinetic Study of the Oxidation of Alcohols with Quaternary Ammonium Permanganates

1993 ◽  
Vol 58 (8) ◽  
pp. 1777-1781 ◽  
Author(s):  
Robert Šumichrast ◽  
Vladislav Holba
Keyword(s):  
Kinetic Study ◽  
Catalytic Reaction ◽  
Rate Constants ◽  
Quaternary Ammonium ◽  
Iterative Procedure ◽  
Activation Parameters ◽  
Reaction Products ◽  
Thermodynamic Activation Parameters ◽  
Oxidation Of Alcohols ◽  
Kinetics Of

Kinetics of the oxidation of 2-propanol, 1-butanol, and 1-pentanol with tetraalkylammonium permanganates have been investigated as function of temperature. The studied reactions are partly autocatalytic, colloidal manganese dioxide as one of the reaction products has been identified as the autocatalyst.A computerized iterative procedure has been used in order to obtained the rate constants of both non-catalytic and catalytic reaction steps together with the thermodynamic activation parameters.

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