Metal removal through synergic coagulation–flocculation using an optimized chitosan–montmorillonite system

Assaad, Elias; Azzouz, Abdelkrim; Nistor, Ileana Denisa; Ursu, Alina-Violeta; Sajin, Tudor; Miron, Doru Neculai; Monette, Frédéric; Niquette, Patrick; Häusler, Robert

doi:10.1016/j.clay.2007.02.007

Cited by 116 publications

(55 citation statements)

References 30 publications

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“…The occurrence of such electrostatic fields is presumably the cause of molecule attraction and adsorption. Such a phenomenon must be very similar to coagulation-floculation processes in water (Assaad et al, 2007), or gas adsorption in dry media (Azzouz et al, 2006). Therefore, adsorption on the ion-exchange sites must involve not only their strong acidity (Taylor et al, 1989) but also their partial charges.…”

Section: Assessment Of the Optimum Activation Parametersmentioning

confidence: 99%

“…Additional beaching attempts at the optimum activation parameters revealed experimental bleaching capacities of nearly 99%, very close to the calculated value. Despite this, adequacy tests remain as yet strongly recommended to check whether the calculated model is valid within the range of the investigated parameters (Assaad et al, 2007;Bergouzini and Duby, 1995;Bodo et al, 2004). For this purpose, three additional attempts at the central point (0, 0, 0) are required for estimating the average error in the value of each coefficient, on the basis of the random variance.…”

Section: Model Calculations and Adequacy Testsmentioning

confidence: 99%

“…Table 1 Factor levels used in the 3 3 factorial experiment design at (S/L) ratio ϭ ϭ 320 g/L Such 3 k factorial designs, implying three variation levels, have already proven their effectiveness in some studies (Assaad et al, 2007;Bodo et al, 2004) because they need only one single set of experimental attempts to assess both the single effect coefficients and the quadratic terms, in contrast with those of type 2 k with two variation levels. The latter require two separate set of experiments (Kirali and Laçin, 2006).…”

Section: Experiments Design Around the Central Point For Colza Oil Blementioning

confidence: 99%

“…For instance, in the presence of metal cations in water, the interaction of montmorillonite with chitosane involves a complex coagulationflocculation process that includes not only absorption, but also chelation and ion-exchange (Assaad et al, 2007). A series of features including the available surface area and acidity of the clay sheets, along with the exchangeable cations exert influence upon the bleaching capacity of a given clay (Güler and Tunç, 1992;Liew et al, 1982;Taylor and Jenkins, 1988).…”

Section: Introductionmentioning

confidence: 99%

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Acid activation of Bentonite for use as a vegetable oil bleaching agent

Makhoukhi¹,

Didi²,

Villemin³

et al. 2009

Grasas y Aceites

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SUMMARY Acid activation of Bentonite for use as a vegetable oil bleaching agentThe design of various experiments in order to assess and simulate the effects of the acid activation of an Algerian bentonite on the bleaching capacity of Colza oil is described. Three key parameters of the acidic activation, namely acid concentration, contact time and temperature, were considered. The calculations made indicated that all variables display advantageous effects up to a certain level on the effectiveness of bleaching, regarded as the responsefunction. The acid concentration exerts a predominant individual effect as compared to the other parameters. Some small interactions between parameters were considered. High bleaching capacity reached 99% as optimal activation. Under accurate statistical measurements, synergy phenomena could be observed. Excessive activation is discussed in terms of loss in both porosity and acid strength. KEY-WORDS: Acid activation -Bentonite -Design of experiments -Oil bleaching.

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Section: Assessment Of the Optimum Activation Parametersmentioning

confidence: 99%

Section: Model Calculations and Adequacy Testsmentioning

confidence: 99%

Section: Experiments Design Around the Central Point For Colza Oil Blementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Acid activation of Bentonite for use as a vegetable oil bleaching agent

Makhoukhi¹,

Didi²,

Villemin³

et al. 2009

Grasas y Aceites

Self Cite

View full text Add to dashboard Cite

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“…This can be attributed to electrostatic charge imbalance in the coag-flocculating phase due to the inability of alkaline cation to adequately favour delamination of the coag-flocculating phase. The consequence is the prevalence of inaccessible surface (Chatterjee et al, 2009;Assad et al, 2007).…”

Section: Process Kinetic Parametersmentioning

confidence: 99%

Turbidimetric Perikinetics Behaviour of Afzelia Bella Seed Biomass for Coag-Flocculation Treatment of Brewery Effluent

Menkiti¹,

Mbah²,

Onukwuli³

2011

IJC

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This current article investigates at room temperature the coag -flocculation behavior of Afzelia bella seed biomass in pH varying brewery effluent (BRE) with respect to kinetics and efficiency. The study employed standard bench scale jar test while Afzelia bella coag-flocculant (ABC) production was based on procedure reported by Ghebremichael. Kinetics data generated were confronted with specified models for the evaluation of functional parameters such as reaction order, rate constant, period etc. The major kinetic results recorded are 2, 8.0 x 10 -5 l/mg.min, and 2.4921 minutes for reaction order, rate constant and period, respectively. Maximum 96.1348% efficiency was recorded at pH 4, 100 mg/l and 30 minutes. The results establish at pilot scale and conditions of the experiment the effectiveness of ABC in the treatment of brewery waste water.

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Rapid removal of cobalt (II) from aqueous solution using cuttlefish bones; equilibrium, kinetics, and thermodynamic study

Sandesh

Kumar

JagadeeshBabu

2012

Asia-Pacific J Chem Eng

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The objective of this study is to assess the adsorption potential of cobalt (II) using cuttlefish bones. The bones were treated with 0.01 N HCl to enhance the heavy metal uptake. The adsorbent was characterized using scanning electron microscope and energy dispersive X-ray spectrometer. An adsorption study was conducted in a batch system to optimize process variables such as initial concentration of cobalt (II), pH, sorbent loading, particle size, process temperature, and contact time. The optimal pH was found to be 9. The kinetic data followed the pseudosecond-order kinetic model, and the equilibrium time was found to be 20 min. In the first minute of the adsorption process, 50% of the cobalt (II) was adsorbed by the cuttle bones. Adsorption isotherms were expressed by the Langmuir and Freundlich adsorption models. The Langmuir adsorption model fits the experimental data reasonably well compared with the Freundlich model. The maximum adsorption capacity of this new sorbent was found to be 76.6 mg g À1 at 40 C. Thermodynamic parameters, including the Gibbs free energy (ΔG o ), enthalpy (ΔH o ), and entropy (ΔS o ), indicated that the adsorption of cobalt (II) by cuttlefish bones was feasible and endothermic at a temperature range of 20 -40 C.

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Metal removal through synergic coagulation–flocculation using an optimized chitosan–montmorillonite system

Cited by 116 publications

References 30 publications

Acid activation of Bentonite for use as a vegetable oil bleaching agent

Acid activation of Bentonite for use as a vegetable oil bleaching agent

Turbidimetric Perikinetics Behaviour of Afzelia Bella Seed Biomass for Coag-Flocculation Treatment of Brewery Effluent

Rapid removal of cobalt (II) from aqueous solution using cuttlefish bones; equilibrium, kinetics, and thermodynamic study

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