scholarly journals The Adsorption Efficiency of Chemically Prepared Activated Carbon from Cola Nut Shells by on Methylene Blue

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Julius Ndi Nsami ◽  
Joseph Ketcha Mbadcam
Keyword(s):  
Methylene Blue ◽  
Activated Carbon ◽  
Experimental Studies ◽  
Isotherm Models ◽  
Solution Ph ◽  
Batch Mode ◽  
Initial Concentration ◽  
Adsorption Isotherm Models ◽  
Pseudo Second Order ◽  
Blue Solution

The adsorption of methylene blue from aqueous solution onto activated carbon prepared from cola nut shell has been investigated under batch mode. The influence of major parameters governing the efficiency of the process such as, solution pH, sorbent dose, initial concentration, and contact time on the removal process was investigated. The time-dependent experimental studies showed that the adsorption quantity of methylene blue increases with initial concentration and decreasing adsorbent dosage. The equilibrium time of 180 min was observed and maximum adsorption was favoured at pH 3.5. The dye removal using 0.1 g of adsorbent was more than 90%. This dosage (0.1 g) was considered as the optimum dosage to remove methylene blue from aqueous solutions. The equilibrium adsorption data were analyzed by the Freundlich, Langmuir adsorption isotherm models. The kinetics of methylene blue solution was discussed by pseudo-first-order, pseudo-second-order, and Elovich models. The adsorption process follows the Elovich rate kinetic model, having a correlation coefficient in the range between 0.9811 and 1.

scholarly journals Orthophosphoric Acid Activated Babul Seed Carbon as an Adsorbent for the Removal of Methylene Blue

2008 ◽  
Vol 5 (4) ◽  
pp. 742-753 ◽  
Author(s):  
M. Sujatha ◽  
A. Geetha ◽  
P. Sivakumar ◽  
P. N. Palanisamy
Keyword(s):  
Methylene Blue ◽  
Activated Carbon ◽  
Adsorption Kinetics ◽  
Orthophosphoric Acid ◽  
Chemical Activation ◽  
Bet Surface Area ◽  
Isotherm Models ◽  
Blue Dye ◽  
Equilibrium Data ◽  
Pseudo Second Order

An Experimental and theoretical study has been conducted on the adsorption of methylene blue dye using activated carbon prepared from babul seed by chemical activation with orthophosphoric acid. BET surface area of the activated carbon was determined as 1060 m2/g. Adsorption kinetics, equilibrium and thermodynamics were investigated as a function of initial dye concentration, temperature and pH. First order Lagergren, pseudo-second order and Elovich kinetic models were used to test the adsorption kinetics. Results were analyzed by the Langmuir, Freundlich and Temkin isotherm models. Based on regression coefficient, the equilibrium data found fitted well to the Langmuir equilibrium model than other models. The characteristics of the prepared activated carbon were found comparable to the commercial activated carbon. It is found that the babul seed activated carbon is very effective for the removal of colouring matter.

scholarly journals Comparison Study of Adsorption of Lead and Methylene Blue on Zeolite, Activated Carbon and Their Composite Materials

2019 ◽  
Vol 25 (8) ◽  
pp. 129-148
Author(s):  
Rafie Rushdy Mohammed
Keyword(s):  
Aqueous Solution ◽  
Methylene Blue ◽  
Activated Carbon ◽  
Composite Materials ◽  
Synthesis Method ◽  
Nitrogen Adsorption ◽  
Batch Mode ◽  
Thermally Activated ◽  
Optimum Synthesis ◽  
Pseudo Second Order

In this study, composite materials consisting of Activated Carbon (AC) and Zeolite were prepared for application in the removal of methylene blue and lead from an aqueous solution. The optimum synthesis method involves the use of metakaolinization and zeolitization, in the presence of activated carbon from kaolin, to form Zeolite. First, Kaolin was thermally activated into amorphous kaolin (metakaolinization); then the resultant metakaolin was attacked by alkaline, transforming it into crystalline zeolite (zeolitization). Using nitrogen adsorption and SEM techniques, the examination and characterization of composite materials confirmed the presence of a homogenous distribution of Zeolite throughout the activated carbon. It has also shown the carbonization process did not destroy the crystalline structure of the zeolite, which was revealed to be intact. Experiments in batch mode were conducted (using three differently-prepared composites, zeolite and activated carbon), to investigate the removal of methylene blue and lead from the aqueous solution of the sorbents. Key experimental parameters (initial concentration, pH, contact time and adsorbent dosage) from the obtained results were measured and analysed. Freundlich and Langmuir models were used to describe the adsorption isotherms, and the observed adsorption kinetic adhered to pseudo-second order.  

Comparative studies on adsorptive removal of heavy metal ions by biosorbent, bio-char and activated carbon obtained from low cost agro-residue

2015 ◽  
Vol 73 (2) ◽  
pp. 423-436 ◽  
Author(s):  
Çisem Kırbıyık ◽  
Ayşe Eren Pütün ◽  
Ersan Pütün
Keyword(s):  
Activated Carbon ◽  
Metal Ion ◽  
Low Cost ◽  
Chemical Activation ◽  
Second Order ◽  
Isotherm Models ◽  
Standard Entropy ◽  
Order Kinetic ◽  
Solution Ph ◽  
Pseudo Second Order

In this study, Fe(III) and Cr(III) metal ion adsorption processes were carried out with three adsorbents in batch experiments and their adsorption performance was compared. These adsorbents were sesame stalk without pretreatment, bio-char derived from thermal decomposition of biomass, and activated carbon which was obtained from chemical activation of biomass. Scanning electron microscopy and Fourier transform–infrared techniques were used for characterization of adsorbents. The optimum conditions for the adsorption process were obtained by observing the influences of solution pH, adsorbent dosage, initial solution concentration, contact time and temperature. The optimum adsorption efficiencies were determined at pH 2.8 and pH 4.0 for Fe(III) and Cr(III) metal ion solutions, respectively. The experimental data were modelled by different isotherm models and the equilibriums were well described by the Langmuir adsorption isotherm model. The pseudo-first-order, pseudo-second-order kinetic, intra-particle diffusion and Elovich models were applied to analyze the kinetic data and to evaluate rate constants. The pseudo-second-order kinetic model gave a better fit than the others. The thermodynamic parameters, such as Gibbs free energy change ΔG°, standard enthalpy change ΔH° and standard entropy change ΔS° were evaluated. The thermodynamic study showed the adsorption was a spontaneous endothermic process.

scholarly journals Preparation of Activated Carbon from the Wood of Paulownia tomentosa as an Efficient Adsorbent for the Removal of Acid Red 4 and Methylene Blue Present in Wastewater

Water ◽  
2021 ◽  
Vol 13 (11) ◽  
pp. 1453
Author(s):  
Sultan Alam ◽  
Muhammad Sufaid Khan ◽  
Wahida Bibi ◽  
Ivar Zekker ◽  
Juris Burlakovs ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Activated Carbon ◽  
Second Order ◽  
Raw Material ◽  
Experimental Result ◽  
Isotherm Models ◽  
Order Kinetic ◽  
Paulownia Tomentosa ◽  
Adsorbent Dosage ◽  
Pseudo Second Order

Paulownia tomentosa, a woody plant that is widely found in Pakistan and in other regions of the world, was used as a raw material to prepare activated carbon using chemical and physical activation methods. Adsorption of the dyes- acid red 4 and methylene blue onto the prepared activated carbon were analyzed by batch experiments. The impacts of different adsorption parameters such as pH, temperature, contact time, initial dye concentration and adsorbent dosage were also evaluated. Equilibrium data were fitted into various isotherm models such as: Langmuir, Temkin and Freundlich. High regression values were achieved with Langmuir isotherm model. Different kinetic adsorption models such as pseudo-first-order, pseudo-second-order and intra-particle diffusion model models were applied. The adsorption kinetics was found to be best-fitted into pseudo-second-order kinetic model. The optimum pH for acid red 4 was around 1 while for methylene blue it was 8. The optimum adsorbent dosage was 0.3 g for both dyes used. The activation energy (Ea) values were 30.57 and 3.712 kJ/mol, respectively for acid red 4 and methylene blue while the enthalpy (ΔH) and entropy (ΔS) values were correspondingly as 24.88/1.1927 kJ/mol and −2843.32/−0.329 J·mol/K for the mentioned dyes. The experimental result showed that the prepared activated carbon was the best in the removal of acid red 4 and methylene blue from aqueous media and therefore, could be preferably used as cheap adsorbent in wastewater treatment.

scholarly journals ADSORPTIVE REMOVAL OF METHYLENE BLUE FROM SYNTHETIC WASTEWATER USING DATE PALM SEEDS, GOETHITE AND THEIR COMPOSITE

2020 ◽  
Vol 5 (1) ◽  
pp. 27-35
Author(s):  
Nasir Abdus- Salam ◽  
Abiola Victoria Ikudayisi-Ugbe ◽  
Fabian Audu Ugbe
Keyword(s):  
Methylene Blue ◽  
Activated Carbon ◽  
Date Palm ◽  
Solution Concentration ◽  
Synthetic Wastewater ◽  
Isotherm Models ◽  
Thermally Activated ◽  
Adsorption Processes ◽  
Pseudo Second Order ◽  
Kinetics And Thermodynamic

The adsorption of Methylene Blue (MB) onto Raw Date-palm Seeds (RDS), Thermally Activated Carbon (TAC), Chemically Activated Carbon (CAC), Goethite (GT) and their Composite (COM) were studied using batch equilibrium technique. Variations of sorptive properties such as initial solution concentration, pH, adsorbent dosage, contact time and temperature had a remarkable influence on the adsorption processes. The data fitted well tested isotherm models in the order; Langmuir (R2 = 0.942 and 0.963) > Freundlich (0.886 and 0.948) > Temkin (0.869 and 0.83) for GT and COM respectively. That of CAC and TAC was best described by Freundlich and Langmuir models respectively while RDS showed very poor fittings. Pseudo-second order and film diffusion models best described the adsorption kinetics. The adsorption was feasible, spontaneous (∆G < 0) and exothermic (except MB-CAC with ∆H being positive). The combined results of isotherm, kinetics and thermodynamic studies suggested a combined chemisorptions and physisorptions processes. Also, the kinetic modeling suggested that intra-particle and film diffusions occurred simultaneously and/or in combination with other processes in the mechanism of adsorption.

scholarly journals Influence of the Surface Properties of the Bois Carré Seeds Activated Carbon for the Removal of Lead From Aqueous Ssolutions

2012 ◽  
Vol 14 (3) ◽  
pp. 201 ◽  
Author(s):  
L. Largitte ◽  
S. Gervelas ◽  
T. Tant ◽  
P. Couespel Dumesnil ◽  
P. Lodewyckx
Keyword(s):  
Activated Carbon ◽  
Surface Area ◽  
Chemical Activation ◽  
Acid Sites ◽  
Second Order ◽  
Equilibrium Studies ◽  
Batch Mode ◽  
Initial Concentration ◽  
Pseudo Second Order ◽  
Adsorbent Dose

<p>An activated carbon from Bois carré (Citharexylum Fruticosum L.) seeds was prepared by chemical activation with phosphoric acid. The activated carbon obtained has a surface area of 594 m<sup>2</sup>/g and a high content of acid groups of 3.44 mmol.g<sup>-1</sup>. This carbon was studied for the removal of lead from water. Sorption studies were performed at 30 °C at different pH and adsorbent doses, in batch mode. Maximum adsorption occurred at pH 7 for an adsorbent dose of 1g/L. Kinetic studies, at the initial concentration of 150 mg/L of lead, pH 5 and an adsorbent dose of 1 g/L, yielded an equilibrium time of 30 h for this activated carbon. The kinetic data were modelled with the pseudo first order, the pseudo second order and the Bangham models. The pseudo second order model fitted the data well. The sorption rate constant (2.10<sup>-3</sup> mol<sup>-1</sup>.Kg.s<sup>-1</sup>) and the maximum amount of lead adsorbed are quite good (0.18 mol.kg<sup>-1</sup>) compared to the data found in literature. Sorption equilibrium studies were conducted in a concentration range of lead from 0 to 150 mg/L, at pH 5, adsorbent dose 1 g/L. In an aqueous lead solution with an initial concentration of 30 mg/L, activated Bois carré seed carbon removed (at equilibrium) 48% of the heavy metal. The equilibrium data were modelled with the Langmuir and Freundlich equations, of which the latter gave the best fit. The Freundlich constants n (3.76 L.mol<sup>-1</sup>) and Kf (1.06 mol.kg<sup>-1</sup>) are in good agreement with literature. The Bois carré seed activated carbon is a very efficient carbon in terms of the metal amount adsorbed per unit of surface area (0. 06 m<sup>2</sup>/g). This good result is due to the presence of many active acid sites on the surface of this activated carbon.</p>

scholarly journals Adsorption of arsenazo (III) due by phosphorus-containing polymer sorbent

2016 ◽  
Vol 81 (8) ◽  
pp. 907-921 ◽  
Author(s):  
Rasim Alosmanov
Keyword(s):  
Ph Effect ◽  
Arsenazo Iii ◽  
Isotherm Models ◽  
Solution Ph ◽  
Phase Contact Time ◽  
Polymer Sorbent ◽  
Adsorption Isotherm Models ◽  
Phosphorus Containing ◽  
Equilibrium Data ◽  
Pseudo Second Order

Phosphorus-containing polymer sorbent was employed for removal hazardous Arsenazo (III) dye from water. The adsorption characteristics were determined by the study at different parameters such as effect of solution pH, effect of initial dye concentration, sorbent dose, phase contact time, and temperature. The equilibrium data were analyzed on the basis of various adsorption isotherm models, namely Langmuir, Freundlich, Temkin, and Dubinin-Radushkevich. The highest monolayer adsorption capacity has been obtained (24.75 mg g-1) at 55?C. Different thermodynamic parameters such as free energy, enthalpy, and entropy have been calculated and it was concluded that when temperature rises, adsorption increases, indicating the endothermic nature of the process. Kinetic parameters were derived by pseudo-first-order, pseudo-second-order and intraparticle kinetic models. Scanning Electron Microscopy and Fourier Transform Infrared spectroscopy were used to characterize the sorbent and also to validate the adsorption mechanism.

scholarly journals Study Into Dynamic Behaviour of the Methylene Blue Adsorption on Activated Carbon

2021 ◽  
Vol 29 (48) ◽  
pp. 105-113
Author(s):  
Alica Pastierová ◽  
Maroš Sirotiak
Keyword(s):  
Methylene Blue ◽  
Activated Carbon ◽  
Contact Time ◽  
Dynamic Behaviour ◽  
Time Effect ◽  
Adsorption Kinetic ◽  
Optimum Conditions ◽  
Methylene Blue Adsorption ◽  
Initial Concentration ◽  
Pseudo Second Order

Abstract This paper presents a study into dynamic behaviour of the methylene blue adsorption (MB) on activated carbon. Effect of four parameters were studied: effect of the adsorbent dosage, effect of contact time, effect of pH, and effect of the initial concentration of methylene blue. The adsorption kinetic data were modelled using the pseudo-first and pseudo-second orders. Results show that, based on the experimental data, the pseudo-second order could be considered satisfactory. Thermodynamic parameters proved that adsorption of dye was spontaneous owing to increase in temperature and endothermic nature. Taguchi method was applied to determine the optimum conditions for removal of methylene blue by activated carbon. The optimum conditions were found to be pH = 7, contact time 60 min, initial concentration of MB 4 mg/L.

scholarly journals EQUILIBRIUM, KINETIC AND THERMODYNAMIC STUDIES OF ADSORPTION OF METHYLENE BLUE ON ACTIVATED CARBON FROM COCOA POD SHELLS

2021 ◽  
Vol 9 (11) ◽  
pp. 62-72
Author(s):  
Akissi Lydie Chantal Koffi ◽  
◽  
Djamatche Paul Valery Akesse ◽  
Herman Yapi Yapo ◽  
David Leonce Kouadio ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Activated Carbon ◽  
Freundlich Isotherm ◽  
Entropy Change ◽  
Isotherm Models ◽  
Batch Adsorption ◽  
Maximum Adsorption Capacity ◽  
Physiochemical Parameters ◽  
Batch Tests ◽  
Pseudo Second Order

The aim of this research is to investigate the feasibility of using activated carbon from cocoa pod shells, waste from agriculture to adsorb methylene blue from aqueous solutions through batch tests. Various physiochemical parameters such as, contact time, initial dye concentration, adsorbent dosage, pH of dye solution and temperature were investigated in a batch-adsorption technique. The process followed the pseudo-second order kinetics model which showed chemical adsorption. Langmuir and Freundlich isotherm models were used to determine adsorption constants. The maximum adsorption capacity at 30°C is 526.31 mg/g. Thermodynamic parameters such as enthalpy change (∆Hº), free energy change (∆Gº) and entropy change (∆Sº) were studied, and the adsorption process of BM was found to be exothermic and spontaneous.

scholarly journals Removal of Methylene Blue Dye from Wastewater Using Periodiated Modified Nanocellulose

2021 ◽  
Vol 2021 ◽  
pp. 1-16
Author(s):  
Hizkeal Tsade Kara ◽  
Sisay Tadesse Anshebo ◽  
Fedlu Kedir Sabir ◽  
Getachew Adam Workineh
Keyword(s):  
Methylene Blue ◽  
Adsorption Process ◽  
Dye Adsorption ◽  
Freundlich Isotherm ◽  
Color Removal ◽  
Isotherm Models ◽  
Blue Dye ◽  
Solution Ph ◽  
X Ray ◽  
Pseudo Second Order

The study was focused on the preparation and characterizations of sodium periodate-modified nanocellulose (NaIO4-NC) prepared from Eichhornia crassipes for the removal of cationic methylene blue (MB) dye from wastewater (WW). A chemical method was used for the preparation of NaIO4-NC. The prepared NaIO4-NC adsorbent was characterized by using X-ray diffraction (XRD), Fourier transform infrared (FTIR), scanning electron microscope (SEM), energy-dispersive X-ray (EDX), and Brunauer–Emmett–Teller (BET) instruments. Next, it was tested to the adsorption of MB dye from WW using batch experiments. The adsorption process was performed using Langmuir and Freundlich isotherm models with maximum adsorption efficiency (qmax) of 90.91 mg·g−1 and percent color removal of 78.1% at optimum 30 mg·L−1, 60 min., 1 g, and 8 values of initial concentration, contact time, adsorbent dose, and solution pH, respectively. Pseudo-second-order (PSO) kinetic model was well fitted for the adsorption of MB dye through the chemisorption process. The adsorption process was spontaneous and feasible from the thermodynamic study because the Gibbs free energy value was negative. After adsorption, the decreased values for physicochemical parameters of WW were observed in addition to the color removal. From the regeneration study, it is possible to conclude that NaIO4-NC adsorbent was recyclable and reused as MB dye adsorption for 13 successive cycles without significant efficient loss.

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