scholarly journals Thermodynamic and Isotherm Analysis on the Removal of Malachite Green Dye Using Thespesia Populnea Bark

2012 ◽  
Vol 9 (4) ◽  
pp. 2575-2588 ◽  
Author(s):  
R. Prabakaran ◽  
S. Arivoli
Keyword(s):  
Malachite Green ◽  
Langmuir Isotherm ◽  
Low Cost ◽  
Isotherm Models ◽  
Acid Activation ◽  
Malachite Green Dye ◽  
Thespesia Populnea ◽  
Initial Ph ◽  
Dye Absorption ◽  
Equilibrium Data

Activated carbon was synthesized from Thespesia Populnea Bark, a low cost material, by sulphuric acid activation; it was tested for its ability to eliminate malachite green in aqueous solution. The parameters studied included contact time, initial dye concentration, carbon dose, pH and temperature. The adsorption followed first order rate equation. In addition, it was found that the adsorption process was described by Freundlich and Langmuir isotherm models. Those models were applied to the equilibrium data. The absorption capacities (Qm) obtained from the Langmuir isotherm plots were 349.20, 365.43, 476.44, and 389.96 mg/g at 30°, 40°, 50°, and 60°C, respectively, at an initial pH 6.0. The temperature variation study showed that the malachite green dye absorption was endothermic and spontaneous with increased randomness at the solid solution interface. The thermodynamic parameters like ∆H°, ∆S°, and ∆G° were calculated from the slope and intercept of the linear plots.

scholarly journals Adsorption of Chromium Ion by Acid Activated Low Cost Carbon-Kinetic, Mechanistic, Thermodynamic and Equilibrium Studies

2008 ◽  
Vol 5 (4) ◽  
pp. 820-831 ◽  
Author(s):  
S. Arivoli ◽  
M. Hema ◽  
M. Karuppaiah ◽  
S. Saravanan
Keyword(s):  
Langmuir Isotherm ◽  
Low Cost ◽  
Mineral Acid ◽  
Ion Concentration ◽  
Isotherm Models ◽  
Equilibrium Studies ◽  
Chromium Ion ◽  
Freundlich Isotherms ◽  
Initial Ph ◽  
Equilibrium Data

A carbonaceous adsorbent prepared from an indigenous waste by acid treatment was tested for its efficiency in removing chromium ion. The parameters studied include agitation time, initial chromium ion concentration, carbon dose, pH and temperature. The adsorption followed first order reaction equation and the rate is mainly controlled by intra-particle diffusion. Freundlich and Langmuir isotherm models were applied to the equilibrium data. The adsorption capacity (Qm) obtained from the Langmuir isotherm plots were 27.40, 26.06, 26.06 and 26.17 mg/g respectively at an initial pH of 7.0 at 30, 40, 50 and 60°C. The temperature variation study showed that the chromium ion adsorption is endothermic and spontaneous with increased randomness at the solid solution interface. Significant effect on adsorption was observed on varying the pH of the chromium ion solutions. Almost 70% removal of chromium ion was observed at 60°C. The Langmuir and Freundlich isotherms obtained, positive ∆H0value, pH dependent results and desorption of dye in mineral acid suggest that the adsorption of chromium ion on PDC involves physisorption mechanism.

scholarly journals Adsorption of Chromium Ions by Acid Activated Low Cost Carbon-Kinetic,Thermodynamic and Equilibrium Studies

2009 ◽  
Vol 6 (s1) ◽  
pp. S1-S11 ◽  
Author(s):  
B. R. Venkatraman ◽  
S. Parthasarathy ◽  
A. Kasthuri ◽  
P. Pandian ◽  
S. Arivoli
Keyword(s):  
Metal Ions ◽  
Langmuir Isotherm ◽  
Metal Ion ◽  
Low Cost ◽  
Mineral Acid ◽  
Isotherm Models ◽  
Equilibrium Studies ◽  
Initial Ph ◽  
Equilibrium Data ◽  
Intra Particle Diffusion

A carbonaceous adsorbent prepared from an indigenous waste, by acid treatment was tested for its efficiency in removing metal ions. The process parameters studied include agitation time, initial metal ions concentration, carbon dose, pH and temperature. The adsorption followed first order reaction equation and the rate is mainly controlled by intra-particle diffusion. Freundlich and Langmuir isotherm models were applied to the equilibrium data. The adsorption capacity (Qm) obtained from the Langmuir isotherm plot were found to around 30 mg/g at an initial pH of 7.0. The temperature variation study showed that the metal ions adsorption is endothermic and spontaneous with increased randomness at the solid solution interface. Significant effect on adsorption was observed on varying the pH of the metal ion solutions. The Langmuir and Freundlich adsorption isotherms obtained, positive ΔH0value, pH dependent results and desorption of metal ions in mineral acid suggest that the adsorption of metal ions on BBC involves chemisorption as well as physisorption mechanism.

scholarly journals Kinetic, Mechanistic, Thermodynamic and Equilibrium Studies on the Adsorption of Rhodamine B by Acid Activated Low Cost Carbon

2008 ◽  
Vol 5 (2) ◽  
pp. 187-200 ◽  
Author(s):  
S. Arivoli ◽  
M. Henkuzhali
Keyword(s):  
Rhodamine B ◽  
Langmuir Isotherm ◽  
Low Cost ◽  
Mineral Acid ◽  
Isotherm Models ◽  
Equilibrium Studies ◽  
Freundlich Isotherms ◽  
Initial Ph ◽  
Equilibrium Data ◽  
Intra Particle Diffusion

A carbonaceous adsorbent prepared from an indigenous waste by acid treatment was tested for its efficiency in removing Rhodamine B (RDB). The parameters studied include agitation time, initial dye concentration, carbon dose, pH and temperature. The adsorption followed first order reaction equation and the rate is mainly controlled by intra-particle diffusion. Freundlich and Langmuir isotherm models were applied to the equilibrium data. The adsorption capacity (Qm) obtained from the Langmuir isotherm plots were 51.546, 47.236, 44.072 and 41.841 mg/g respectively at an initial pH of 7.0 at 30, 40, 50 and 60°C. The temperature variation study showed that the Rhodamine B adsorption is endothermic and spontaneous with increased randomness at the solid solution interface. Significant effect on adsorption was observed on varying the pH of the Rhodamine B solutions. Almost 90% removal of Rhodamine B was observed at 60°C. The Langmuir and Freundlich isotherms obtained, positive ΔH0value, pH dependent results and desorption of dye in mineral acid suggest that the adsorption of Rhodamine B on PSC involves physisorption mechanism.

Equilibrium and Thermodynamic Studies on Biosorption of Malachite Green from Aqueous Solution by Fungal Biomass

2011 ◽  
Vol 148-149 ◽  
pp. 470-473
Author(s):  
Li Fang Zhang
Keyword(s):  
Aqueous Solution ◽  
Malachite Green ◽  
Fungal Biomass ◽  
Ph Value ◽  
Freundlich Isotherm ◽  
Isotherm Models ◽  
Thermodynamic Studies ◽  
Biosorption Process ◽  
Initial Ph ◽  
Equilibrium Data

The biosorption of Malachite Green from aqueous solution was investigated by using pretreated fungal biomass in a batch system. The effects of initial pH, NaCl concentration, initial dye concentration and temperature on dye biosorption were studied. The results showed that the pretreated fungal biomass exhibited higher dye removal at initial pH value of 5.0-6.0. The bosorption capacity was increased with the increasing temperature in studied temperature range. The Langmuir and Freundlich isotherm models were applied to experimental equilibrium data and the Langmuir model better described the equilibrium dye uptake than the Freundlich model. Thermodynamic studies revealed that the biosorption process was successful, spontaneous and endothermic in nature.

scholarly journals Adsorption of Nickel Ion by Low Cost Carbon-Kinetic, Thermodynamic and Equilibrium Studies

2009 ◽  
Vol 6 (s1) ◽  
pp. S347-S357 ◽  
Author(s):  
V. Vijayakumaran ◽  
S. Arivoli ◽  
S. Ramuthai
Keyword(s):  
Langmuir Isotherm ◽  
Metal Ion ◽  
Low Cost ◽  
Mineral Acid ◽  
Ion Concentration ◽  
Isotherm Models ◽  
Equilibrium Studies ◽  
Nickel Ion ◽  
Nickel Ions ◽  
Initial Ph

A carbonaceous adsorbent prepared from an indigenous waste, by acid treatment was tested for its efficiency in removing nickel ion. The process parameters studied include agitation time, initial metal ion concentration, carbon dose, pH and temperature. The adsorption followed first order reaction equation and the rate is mainly controlled by intraparticle diffusion. Freundlich and Langmuir isotherm models were applied to the equilibrium data. The adsorption capacity (Qm) obtained from the Langmuir isotherm plot were found to around 43 mg/g at an initial pH of 7.0. The temperature variation study showed that the nickel ions adsorption is endothermic and spontaneous with increased randomness at the solid solution interface. Significant effect on adsorption was observed on varying the pH of the nickel ion solutions. The Langmuir and Freundlich adsorption isotherms obtained, positive ΔH0value, pH dependent results and desorption of metal ions in mineral acid suggest that the adsorption of nickel ion on MCC involves chemisorption as well as physisorption mechanism.

scholarly journals Malachite Green Dye Removal Using the Seaweed Enteromorpha

2011 ◽  
Vol 8 (2) ◽  
pp. 649-656 ◽  
Author(s):  
R. Jayaraj ◽  
M. Chandra Mohan ◽  
P. Martin Deva Prasath ◽  
T. Hidhayathullah Khan
Keyword(s):  
Aqueous Solution ◽  
Malachite Green ◽  
Freundlich Isotherm ◽  
Isotherm Models ◽  
Batch Adsorption ◽  
Model Parameters ◽  
Adsorption Method ◽  
Malachite Green Dye ◽  
Equilibrium Data ◽  
Pseudo Second Order

Malachite green adsorption from an aqueous solution onto activatedEnteromorphacarbon has been studied experimentally using batch adsorption method. Adsorption kinetics and equilibrium were investigated as a function of initial dye concentration, pH, contact time and adsorbent dosage. Kinetics studies indicated that the adsorption followed pseudo second order reaction. Equilibrium data was analyzed using Langmuir and Freundlich isotherm models. The adsorption capacity ofEnteromorphawas found to be 94.74%. On the basis of experimental results and the model parameters, it can be inferred that the carbonaceousEnteromorphais effective for the removal of malachite green from aqueous solution.

scholarly journals Removal of Malachite Green Dye Using Oil Palm Empty Fruit Bunch as a Low-Cost Adsorbent

2021 ◽  
Vol 11 (6) ◽  
pp. 14998-15008
Keyword(s):  
Malachite Green ◽  
Oil Palm ◽  
Low Cost ◽  
Isotherm Models ◽  
Batch Adsorption ◽  
Empty Fruit Bunch ◽  
Initial Concentration ◽  
Adsorbent Dosage ◽  
Malachite Green Dye ◽  
Monolayer Adsorption

This present work is aimed to investigate the potential use of oil palm empty fruit bunch (EFB) as a low-cost adsorbent for the removal of malachite green dye. The untreated and treated palm oil empty fruit bunch characteristics were studied using Fourier Transform Infra-Red (FTIR) spectroscopy and scanning electron microscopy. The effects of initial concentration (20-100 mg/L) and adsorbent dosage (0.2-1.0 g) on the adsorption process were investigated to remove malachite green dye by batch adsorption method. Results show high-performance removal of dye for untreated and treated EFB with the adsorptive removal of 88.3% and 94.5% of the initial concentration and 80.84% and 88.07% of the adsorbent dosage. The adsorption isotherms were analyzed using Langmuir and Freundlich isotherm models. The results satisfactorily fitted with Langmuir isotherm revealed that monolayer adsorption mechanisms occurred on the EFB adsorbent surface. The maximum monolayer adsorption capacities were 714.3 mg/g and 1250 mg/g for untreated and treated EFB adsorbents, respectively. The overall results indicate that the treated EFB by alkaline method could be used as a promising low-cost adsorbent to remove the malachite green dye.

scholarly journals Adsorption isotherm and thermodynamic studies of As(III) removal from aqueous solutions using used cigarette filter ash

2019 ◽  
Vol 9 (8) ◽  
Author(s):  
Pezhman Zein Al-Salehin ◽  
Farid Moeinpour ◽  
Fatemeh S. Mohseni-Shahri
Keyword(s):  
Aqueous Solutions ◽  
Langmuir Isotherm ◽  
Adsorption Equilibrium ◽  
Isotherm Models ◽  
Maximum Adsorption Capacity ◽  
Cigarette Filter ◽  
Electron Microscopy Analysis ◽  
Equilibrium Data ◽  
Thermodynamic Variables ◽  
Adsorption Equilibrium Data

Abstract In the present paper, used cigarette filter ash was prepared and used as an active adsorbent to remove As(III) ions from aqueous solutions. The prepared adsorbent structure was identified by scanning electron microscopy analysis, Brunauer–Emmett–Teller method and energy-dispersive X-ray spectroscopy analysis. The influence of contact time, pH, adsorbent dose and initial concentration of As(III) on the removal of As(III) was assessed. Several isotherm models were checked to illustrate the adsorption equilibrium. The adsorption equilibrium data adapted well with the Langmuir isotherm model. The maximum adsorption capacity of 33.33 mg/g was acquired from the Langmuir isotherm. The calculated thermodynamic variables verified that the adsorption process is spontaneous and endothermic.

scholarly journals Studies on Removal of Cr (VI) from Aqueous Solutions Using Powder of Mosambi Fruit Peelings (PMFP) As a Low Cost Sorbent

2012 ◽  
Vol 9 (3) ◽  
pp. 1389-1399 ◽  
Author(s):  
R. Hema Krishna ◽  
A. V. V. S. Swamy
Keyword(s):  
Particle Size ◽  
Aqueous Solutions ◽  
Metal Ion ◽  
Low Cost ◽  
Ion Concentration ◽  
Isotherm Models ◽  
Batch Tests ◽  
Freundlich Adsorption Isotherm ◽  
Equilibrium Data ◽  
Agitation Time

The powder of mosambi fruit peelings (PMFP) was used as an adsorbent for the removal of heavy metal like Cr (VI) from aqueous solutions was studied using batch tests. The influence of physico-chemical key parameters such as the initial metal ion concentration, pH, agitation time, adsorbent dosage, and the particle size of adsorbent has been considered in batch tests. Sorbent ability to adsorb Cr (VI) ions was examined and the mechanism involved in the process investigated. The optimum results were determined at an initial metal ion concentration was 10 mg/lit, pH=2, agitation time – 60 min, an adsorbent dose (150 mg/50 ml) and the particle size (0.6 mm). The % adsorption, Langmuir constants [Q0=7.51(mg/g) and b=1.69(mg/lit)] Freundlich constant(Kf=2.94), Lagergren rate constants (Kad(min-1)=5.75 x 10-2) for [Cr(VI)] 10 mg/lit were determined for the adsorption system as a function of sorbate concentration. The equilibrium data obtained were tested using Langmuir, Freundlich adsorption isotherm models, and the kinetic data obtained were fitted to pseudo first order model.

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