A comparative study on the kinetics and mechanisms of removal of Reactive Black 5 by adsorption onto activated carbons and bone char

Ip, A.W.M.; Barford, J. P.; McKay, Gordon

doi:10.1016/j.cej.2009.12.003

Cited by 180 publications

(84 citation statements)

References 32 publications

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“…The second portion is the gradual adsorption stage, where the intra-particle diffusion is rate controlled. The third portion is the fi nal equilibrium stage, where the intra-particle diffusion starts to slow down due to the extremely low solute concentration in solution [11,12]. The results for the adsorbent amount of 2 and 3 g are not shown in order not to burden the work since it is similar results.…”

Section: Resultssupporting

confidence: 55%

Adsorption Kinetics of Reactive Dyes on Ash from Town Heating Plant

Djordjević¹,

Stojiljković²,

Šmelcerović³

2014

Archives of Environmental Protection

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Abstract:In order to investigate the mechanism of adsorption of reactive dyes from the textile industry on ash from heating plant produced by brown coal combustion, some characteristic sorption constants are determined using Langergren adsorption equations for pseudo-fi rst and pseudo-second order. Combined kinetic models of pseudo-fi rst order and pseudo-second order can provide a simple but satisfactory explanation of the adsorption process for a reactive dye. According to the characteristic diagrams and results of adsorption kinetic parameters of reactive dyes on ashes, for the applied amounts of the adsorbents and different initial dye concentrations, it can be concluded that the rate of sorption is fully functionally described by second order adsorption model. According to the results, the rate constant of pseudo-second order decreases with increasing initial dye concentration and increases with increasing amount of adsorbent -ash.

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Section: Resultssupporting

confidence: 55%

Adsorption Kinetics of Reactive Dyes on Ash from Town Heating Plant

Djordjević¹,

Stojiljković²,

Šmelcerović³

2014

Archives of Environmental Protection

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“…The high correlation coefficient values (R 2 = 0.906 -1.000) for Langmuir and Freundlich (0.91-1.00) models strongly imply the fact that the dye-LDH adsorption closely follows both Langmuir and Freundlich models of adsorption under the present experimental conditions. This finding is not unusual as previous study by Ip et al [15] also found that adsorption of RB5 by bamboo activated carbon followed a hybrid of Langmuir and Freundlich equations. The dye binding capacities reflected by maximum monolayer adsorption capacities, Q o (mg/g) were found to be in the order: RB5 (277.8) > AB29 (186.4) > RO16 (172.4) > RR120 (166.7).…”

Section: Adsorption Isotherms Modelingsupporting

confidence: 48%

Equilibrium and Themodynamic Studies of Anionic Dyes Removal by an Anionic Clay-Layered Double Hydroxide

Kantasamy¹,

Sumari²

2016

MJAS

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Adsorption isotherm describes the interaction of adsorbates with adsorbent in equilibrium. Equilibrium data was examined using Langmuir and Freundlich isotherm models. Thermodynamic studies were used to evaluate the thermodynamic parameters; heat of enthalpy change (ΔH°), Gibbs free energy change (ΔG°) and heat of entropy change (ΔS°) in order to gain information regarding the nature of adsorption (exothermic or endothermic). Four reactive dyes of anionic type, Acid Blue 29 (AB29), Reactive Black 5 (RB5), Reactive Orange 16 (RO16) and Reactive Red 120 (RR120) were used to obtain equilibrium isotherms at 25 °C, 35 °C, 45 °C and 55 °C. Based on Giles' classification, the isotherm produced were of L2-type, indicating strong dye affinity towards the adsorbent, and with weak competition with the solvent molecules for active adsorption sites. Equilibrium data fitted both Langmuir and Freundlich isotherm models with high correlation coefficient (R 2 > 0.91) indicating the possibility of both homogeneity and heterogeneous nature of adsorption. The negative values of ΔG° indicate the adsorption processes were spontaneous and feasible. The negative values of ΔH° lie between -20 to -75 kJ/mol, suggesting these processes were exothermic and physical in nature. The negative values of ΔS° are indication of decreased disorder and randomness of spontaneous adsorption of reactive dyes on layered double hydroxide as adsorbent.Keywords: anionic dyes, layered double hydroxides, equilibrium isotherm, thermodynamic parameters Abstrak Isoterma penjerapan menerangkan interaksi antara bahan dijerap dan bahan jerap yang berada dalam keseimbangan. Data keseimbangan yang diperolehi dianalisis menggunakan model Langmuir dan Freundlich. Kajian termodinamik digunakan untuk menilai parameter-parameter termodinamik; perubahan haba entalpi (ΔH °), perubahan tenaga Gibbs bebas (ΔG°) dan perubahan haba entropi (ΔS°). Ia bertujuan untuk mendapatkan maklumat mengenai jenis penjerapan (eksoterma atau endoterma). Empat pewarna reaktif jenis anion iaitu, Asid Biru 29 (AB29), Reaktif Hitam 5 (RB5), Reaktif Jingga 16 (RO16) dan Reaktif Merah 120 (RR120) digunakan untuk mendapatkan isoterma keseimbangan pada suhu 25 °C, 35 °C, 45 °C dan 55 °C. Berdasarkan klasifikasi Giles, isoterma yang dihasilkan adalah jenis L2, yakni menandakan bahawa pewarna-pewarna ini mempunyai afiniti tinggi kepada bahan penjerap, dan mempunyai persaingan lemah dengan molekul-molekul pelarut untuk menambat kepada tapak atau permukaan aktif bahan penjerap. Data keseimbangan yang diperolehi didapati sesuai dipadankan dengan model isoterma Langmuir dan Freundlich dengan pekali korelasi yang tinggi (R2 > 0.91), menunjukkan kemungkinan wujud kedua-dua ciri kehomogenan dan heterogen untuk proses penjerapan. Nilai negatif ΔG° menunjukkan proses penjerapan adalah spontan dan boleh dilaksanakan. Nilai negatif ΔH° adalah antara -20 dan -75 kJ/mol, dan ini mencadangkan proses penjerapan adalah eksoterma dan fizikal. Nilai negatif ΔS° adalah petanda penurunan gangguan dan kerawakkan p...

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“…The use of activated carbons as adsorbents for colour removal is well documented in the literature (Pereira et al 2003;Faria et al 2004;Órfão et al 2006;Gómez et al 2007;Demirbas 2009;Rodríguez et al 2009;Mak et al 2009;Ip et al 2010). Most of the earlier reports relate the adsorption capacities mainly to the textural properties of the adsorbents (surface area, pore size distribution, micropore volume), overlooking the influence of the surface chemistry of the materials, which can play a decisive role in the process (Leon y Leon and Radovic 1994;Radovic and Rodríguez-Reinoso 1997;Rodríguez-Reinoso 1998;Radovic et al 2001).…”

Section: Introductionmentioning

confidence: 95%

Adsorption of dyes on carbon xerogels and templated carbons: influence of surface chemistry

et al. 2010

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The removal of textile dyes by adsorption onto carbon materials with extended mesoporosity is addressed in the present work. Two types of high surface area carbon adsorbents were prepared, namely a carbon xerogel and a templated carbon. Both materials were subsequently subjected to appropriate treatments in order to modify their surface chemistries, while keeping their textural properties relatively unchanged. The carbon adsorbents were extensively characterized by different techniques in order to correlate their adsorption performances with the corresponding surface properties. The behavior of the different materials was evaluated by determining equilibrium adsorption isotherms of two anionic dyes (Reactive Red 241 and Acid Blue 113) at different pH values. The results are compared with data previously obtained with commercial activated carbons subjected to the same treatments, and discussed in terms of the carbon surface chemistry and the interaction between the dye molecules and the adsorbent surface (dispersive and electrostatic interactions).

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A comparative study on the kinetics and mechanisms of removal of Reactive Black 5 by adsorption onto activated carbons and bone char

Cited by 180 publications

References 32 publications

Adsorption Kinetics of Reactive Dyes on Ash from Town Heating Plant

Adsorption Kinetics of Reactive Dyes on Ash from Town Heating Plant

Equilibrium and Themodynamic Studies of Anionic Dyes Removal by an Anionic Clay-Layered Double Hydroxide

Adsorption of dyes on carbon xerogels and templated carbons: influence of surface chemistry

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