Acid dye adsorption onto cationized polyamide fibres. Modeling and consequent interpretations of model parameter behaviours

Khalfaoui, Mohamed; Baouab, Mohamed Hassen V.; Gauthier, Robert; Lamine, Abdelmottaleb Ben

doi:10.1016/j.jcis.2005.09.030

Cited by 36 publications

(18 citation statements)

References 16 publications

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“…Figure 8 shows that the parameter c 1/2 remained practically constant, indicating that, in this temperature range, MB concentration at half saturation was litlle influenced. Similar trends about the aforementioned parameters were found by others (Khalfaoui et al 2006;Knani et al 2014;Dotto et al 2015b). In general lines, this work demonstrated three aspects: (1) the ultrasonic treatment is adequate to improve the chitin adsorption characteristics; (2) the MB adsorption on SMC can be successfully represented by the statistical physics theory; (3) the statistical physics parameters showed that the physicochemical interactions between MB and SMC are dependent of the temperature.…”

Section: Interpretation Of the Statistical Physics Parameterssupporting

confidence: 90%

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Interpretations about methylene blue adsorption by surface modified chitin using the statistical physics treatment

et al. 2015

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In this work, the adsorption of methylene blue (MB) on surface modified chitin (SMC) was studied at molecular level using the statistical physics theory. SMC adsorbent was prepared, characterized and applied for MB adsorption. Equilibrium curves were obtained at different temperatures (298, 308, 318 and 328 K) and interpreted by the statistical physics formulism. The parameters, such as, 'n' (number of adsorbed molecule(s) per site), 'N m ' (receptor site density) and 'c 1/2 ' (concentration at half saturation) were estimated and interpreted in detail. At finally, an interaction mechanism was proposed. The results revealed that the MB adsorption on SMC can be successfully represented by the statistical physics theory. The statistical physics parameters showed that the physicochemical interactions between MB and SMC are dependent of the temperature. At 298 K, the MB molecules were anchored by one or two receptor sites, in parallel to the SMC surface (probably hydroxyl and N-acetyl groups on the SMC surface). Otherwise, at 308, 318 and 328 K, the 'n' values higher than 1, indicated a perpendicular anchorage. List of symbolsARE Average relative error (%) BET Brunauer, Emmett and Teller method BJH Barrett, Joyner and Halenda method C 0 Initial dye concentration (mg/L) c Equilibrium dye concentration (mg/L) c 1/2 Concentration at half saturation (mg/L) FT-IR Fourier transform infrared spectroscopy k B Boltzmann constant (J/K) MB Methylene blue M a Adsorbed quantity (mg/g) M M nN m (mg/g) m M a /N a N a Number of adsorbed molecules N i Receptor site occupation state N m Receptor site density (mg/g) n Number of adsorbed molecules per site n 0 Anchorage number R 2 Coefficient of determination, dimensionless SEM Scanning electron microscopy SMC Surface modified chitin T Temperature (K) UA Ultrasound-assisted V Volume of solution (L) X Adsorbent amount (g) XRD X-ray diffraction Z gcGrand canonical partition functionGreek symbols b 1/k B T eReceptor site adsorption energy (kJ/mol) l Chemical potential (kJ/mol) k max Maximum wavelength of MB

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Section: Interpretation Of the Statistical Physics Parameterssupporting

confidence: 90%

“…It can be verified that the number of adsorbed MB molecules per site (n) increased with the temperature. This can be attributed to the thermal collision (Khalfaoui et al 2006). At 298 K, the n value was lower than 1, and consequently, the anchorage number (n 0 ) was 1.38.…”

Section: Experimental Curves and Model Validationmentioning

confidence: 99%

Interpretations about methylene blue adsorption by surface modified chitin using the statistical physics treatment

et al. 2015

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“…Initially, the hydrogen is considered as a perfect gas [30][31][32] supposing that the mutual interaction between the gaseous hydrogen molecules will be ignored. Usually, below the critical pressure (P=13 bar) and higher than critical temperature (T=33 K), hydrogen is an ideal gas [31,33]. This is the case of the experiment for hydrogen (P exp ≤ 10 bar and T exp ≥ 33 K).…”

Section: Characterization Through Statistical Physicsmentioning

confidence: 99%

“…Firstly, we start from the grand potential J and the total grand canonical partition function Z gc . Secondly, according to the total energy of absorption and to the chemical potential µ, we obtain [50]: Then the entropy is deduced, and it is written as follows [33]:…”

Section: Variation Absorption Energies According To Temperaturementioning

confidence: 99%

Morphologic, Structural, Steric, Energetic and Thermodynamic Studies of the Mechanical Alloy Mg50Ni45Ti5 for Hydrogen Storage

Mechi¹,

Khemis²,

Dhaou³

et al. 2017

J Phys Chem Biophys

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“…Such a site is at a state of equilibrium between a free state and an absorbed one. The study of particle exchange for the free state and the absorbed state requires a grand canonical ensemble in statistical physics [56] so as to take account of the variation of particle number during the process of absorption and desorption. This study is divided into three parts.…”

Section: Modeling Of Absorption and Desorption Isothermsmentioning

confidence: 99%

A microscopic study of absorption and desorption of hydrogen in LaNi4.85Al0.15 using the grand canonical ensemble of statistical physics

Mechi

Sellaoui

Khemis

et al. 2016

Fluid Phase Equilibria

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Acid dye adsorption onto cationized polyamide fibres. Modeling and consequent interpretations of model parameter behaviours

Cited by 36 publications

References 16 publications

Interpretations about methylene blue adsorption by surface modified chitin using the statistical physics treatment

Interpretations about methylene blue adsorption by surface modified chitin using the statistical physics treatment

Morphologic, Structural, Steric, Energetic and Thermodynamic Studies of the Mechanical Alloy Mg50Ni45Ti5 for Hydrogen Storage

A microscopic study of absorption and desorption of hydrogen in LaNi4.85Al0.15 using the grand canonical ensemble of statistical physics

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