Application of branched pore diffusion model in the adsorption of reactive dyes on activated carbon

Yang, Xiaoyan; Al‐Duri, Bushra

doi:10.1016/s1385-8947(00)00233-3

Cited by 164 publications

(92 citation statements)

References 15 publications

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“…Transfer rate of solute from macropore to micropore: (Peel et al, 1981;Yang and Al-Duri, 2001;Ko et al, 2002) Shrinking core theory model This model used to describe the intrapellet adsorption is controlled by pore diffusion, supposing adsorption firstly occurs at the outer region of adsorbent, then the mass transfer zone moves inward together with the extending of saturated outer region and shrinking of unloaded core (Fig. 5) The mass transfer flux at the solid-liquid phase interface: Du et al, 2007;2008) To be continued A review of surface diffusion is available elsewhere (Medved and Cerny, 2011), which might provide some ideas to modify the intrapellet diffusion models.…”

Section: General Rate Modelsmentioning

confidence: 99%

Mathematically modeling fixed-bed adsorption in aqueous systems

Cai

Pan

2013

J. Zhejiang Univ. Sci. A

327

166

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Adsorption is one of the widely used processes in the chemical industry environmental application. As compared to mathematical models proposed to describe batch adsorption in terms of isotherm and kinetic behavior, insufficient models are available to describe and predict fixed-bed or column adsorption, though the latter one is the main option in practical application. The present review first provides a brief summary on basic concepts and mathematic models to describe the mass transfer and isotherm behavior of batch adsorption, which dominate the column adsorption behavior in nature. Afterwards, the widely used models developed to predict the breakthrough curve, i.e., the general rate models, linear driving force (LDF) model, wave propagation theory model, constant pattern model, Clark model, Thomas model, Bohart-Adams model, Yoon-Nelson model, Wang model, Wolborska model, and modified dose-response model, are briefly introduced from the mechanism and mathematical viewpoint. Their basic characteristics, including the advantages and inherit shortcomings, are also discussed. This review could help those interested in column adsorption to reasonably choose or develop an accurate and convenient model for their study and practical application.

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Section: General Rate Modelsmentioning

confidence: 99%

Mathematically modeling fixed-bed adsorption in aqueous systems

Cai

Pan

2013

J. Zhejiang Univ. Sci. A

327

166

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“…They are commonly used in the textile industry because of their bright colours, excellent colourfastness and ease of application [2,3] . A large number of reactive dyes are azo compounds that are linked by an azo group [4] .…”

Section: Introductionmentioning

confidence: 99%

“…These include: adsorption [10] , nanofiltration [11,12] , colloidal gas aphrons [13] , ultrasonic decomposition [14] , electro coagulation [15] , coagulation and precipitation [16] , advanced chemical oxidation [17] , electrochemical oxidation [18][19] , photooxidation [18] , predispersed solvent extraction [20] , ozonation [21][22][23][24] , supported liquid membrane [2,25,26] , liquid-liquid extraction [25,27] and aerobic and anaerobic biological processes [28,29] . The advantages and disadvantages of some methods of dye removal from wastewater are given in Table 1.…”

Section: Introductionmentioning

confidence: 99%

Removal of Dye from Textile Wastewater Using Plant Oils Under Different pH and Temperature Conditions

Mahmoud¹,

Ghaly²,

Brooks³

2007

American J. of Environmental Sciences

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Abstract:The effectiveness of five plant oils (cottonseed, olive, canola sunflower and used cooking oil) for the removal of dye from textile wastewater was evaluated. The study revealed that the dye removal efficiency increased as the temperature was increased. Under low pH, both the oil and dye split into two components each. Neither one of the oil components joined with either one of the dye components. However, the observed reduction in the absorbance under acidic conditions can be attributed to the dye components losing some of their original color or producing different colors that were not effectively measured at 475 nm. When the dye solution was shaken with the oil under alkaline conditions, it formed a colloidal solution containing the oil plus the dye, resulting in a significant dye removal from solution. The results also showed that the optimum conditions for the dye removal for various oils were at a pH of 13 and a temperature of 55 °C, except for canola oil that produced the highest dye removal efficiency at pH of 7. The used cooking oil achieved the highest dye removal efficiency (95.45%) followed by olive oil (87.00%). The other oils (cottonseed, canola and sunflower achieved dye removal efficiencies below 58% and are, therefore, not recommended for dye removal.

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“…The energy of activation for adsorption of lead can be determined by the second-order rate constant and it is expressed in Arrhenius form (Yang and Al-Duri 2001) log…”

Section: Effect Of Temperature On Thermodynamic Adsorption Parametersmentioning

confidence: 99%

“…(12). Positive value of enthalpy change (DH) indicates that the adsorption process is endothermic in nature, and the negative value of change in internal energy (DG) shows the spontaneous adsorption of lead on the adsorbent (Yang and Al-Duri 2001). Positive values of entropy change show the increased randomness of the solution interface during the adsorption of lead on the adsorbent (Table 4).…”

Section: Langmuir Isothermmentioning

confidence: 99%

Removal of lead from aqueous solutions by electrocoagulation: isotherm, kinetics and thermodynamic studies

Kamaraj

Ganesan

Vasudevan

2013

Int. J. Environ. Sci. Technol.

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The present study provides an electrocoagulation process for the removal of lead from water using magnesium and galvanized iron as anode and cathode, respectively. The various operating parameters such as the effect of initial pH, current density, electrode configuration, inter-electrode distance, co-existing ions and temperature on the removal efficiency of lead were studied. The results showed that the maximum removal efficiency of 99.3 % at a pH of 7.0 was achieved at a current density 0.8 A/dm 2 with an energy consumption of 0.72 kWh/m 3 . The experimental data were fitted with several adsorption isotherm models to describe the electrocoagulation process. The adsorption of lead preferably fitting the Langmuir adsorption isotherm suggests monolayer coverage of adsorbed molecules. In addition, the adsorption kinetic studies showed that the electrocoagulation process was best described using the second-order kinetic model at various current densities. Thermodynamic parameters, including the Gibbs free energy, enthalpy and entropy, indicated that the lead adsorption of water on magnesium hydroxides was feasible, spontaneous and endothermic.

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Application of branched pore diffusion model in the adsorption of reactive dyes on activated carbon

Cited by 164 publications

References 15 publications

Mathematically modeling fixed-bed adsorption in aqueous systems

Mathematically modeling fixed-bed adsorption in aqueous systems

Removal of Dye from Textile Wastewater Using Plant Oils Under Different pH and Temperature Conditions

Removal of lead from aqueous solutions by electrocoagulation: isotherm, kinetics and thermodynamic studies

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