Adsorption of methylene blue on activated carbon: An experiment illustrating both the Langmuir and Freundlich isotherms

1991 ◽  
Vol 68 (4) ◽  
pp. 349 ◽  
Author(s):  
J. H. Potgieter
Keyword(s):  
Methylene Blue ◽  
Activated Carbon ◽  
Freundlich Isotherms ◽  
Langmuir And Freundlich Isotherms

scholarly journals Preparation of activated charcoal adsorbent from waste tire

2012 ◽  
Vol 10 (10) ◽  
pp. 80-83 ◽  
Author(s):  
Drona Raj Barai ◽  
Vinay Kumar Jha
Keyword(s):  
Methylene Blue ◽  
Activated Carbon ◽  
Activated Charcoal ◽  
Activated Carbons ◽  
Freundlich Isotherms ◽  
Waste Tire ◽  
Scientific World ◽  
Langmuir And Freundlich Isotherms ◽  
Pseudo Second Order

Activated carbons were prepared from waste tire in two different routes. Some physical properties of thus prepared activated carbons were measured and the characterization of their phases was done by XRD measurement. The adsorption isotherms of methylene blue were simulated by the Langmuir and Freundlich isotherms. The Langmuir isotherms were found to have better fitting with Qmax values 0.227, 0.255 and 0.256 mmol/g for the activated carbons prepared in air, nitrogen, nitrogen and steam respectively while it was 0.275 mmol/g for activated carbon impregnated with H3 PO4 . The overall reaction was found to be pseudo-second order with the rate constant of 8.314 × 10-4 Lg/(mmolmin). The surface area of the best prepared activated carbon was 334.2 m2 /g. Scientific World, Vol. 10, No. 10, July 2012 p80-83 DOI: http://dx.doi.org/10.3126/sw.v10i10.6868

Ultrasonic Treatment of Activated Carbon Used in Adsorption of Basic Fuchsin

2011 ◽  
Vol 704-705 ◽  
pp. 486-491
Author(s):  
Yi Nan Hao ◽  
Xi Ming Wang ◽  
Li Jun Ding ◽  
Da Yan Ma
Keyword(s):  
Activated Carbon ◽  
Contact Time ◽  
Equilibrium Concentration ◽  
Acid Activation ◽  
Basic Fuchsin ◽  
Freundlich Isotherms ◽  
Langmuir And Freundlich Isotherms ◽  
Different Temperatures ◽  
Endothermic Process ◽  
Pseudo Second Order

Xanthoceras Sorbifolia Bunge hull activated carbon (XSBHAC) developed by phosphoric acid activation for removing basic fuchsin (BF) has been investigated. Experiments were carried out as function of contact time, pH (4-10) and temperature (303,313 and 323K). Adsorption isotherms were modeled with the Langmuir and Freundlich isotherms. The data fitted well with the Langmuir isotherm. The Langmuir monolayer saturation capacities of BF adsorbed onto activated carbon were 351.35, 354.96 and 355.94 mg/g at 303,313, and 323 K, respectively.The kinetic models were also studied .The rates of adsorption were found to conform to the pseudo-second-order kinetics with good correlation.Using the equilibrium concentration contents obtained at different temperatures, various thermodynamic parameters,such as △G,△H and △S, have been calculated. The thermodynamics parameters of system indicated spontaneous and endothermic process. Key words: Xanthoceras sorbifolia bunge hull;biosorption; basic fuchsin

scholarly journals Clarification of Reprocessed Syrup and Use in the Formulation of Lollipop-Type Hard Candies

2020 ◽  
Vol 10 (6) ◽  
pp. 6846-6864
Keyword(s):  
Experimental Data ◽  
Activated Carbon ◽  
Sucrose Solution ◽  
Freundlich Isotherm ◽  
Adsorptive Capacity ◽  
Suitable Model ◽  
Distilled Water ◽  
Visual Evaluation ◽  
Freundlich Isotherms ◽  
Langmuir And Freundlich Isotherms

The objective was to evaluate the removal of dye using activated carbon, and apply the best condition in the removal of candy reprocessing syrup pigment, as well as to evaluate its influence in the visual aspect of a lollipop. Adsorption capacity tests were performed with the dye diluted with and without sucrose, and from the data, the linearization of the Langmuir and Freundlich isotherms were calculated. The lollipop was prepared with syrup treated with activated carbon and visually evaluated using a panel of untrained tasters. The Freundlich isotherm adjusted more appropriately to the experimental data of the adsorption of the dye diluted in distilled water, while for the dye diluted in sucrose solution, the most suitable model was Langmuir's. The experimental design condition showed the highest adsorptive capacity (26.91 mg.g-1) for the dye diluted in the aqueous solution was at a temperature of 60 ºC and pH 5.5, while for the sucrose-diluted dye solution, was 103.09 mg.g-1, under the same conditions. The visual evaluation of the lollipop indicated the possibility of adding up to 15% of reprocessing syrup. Thus, the use of activated carbon is an alternative to remove the coloring from candy syrup and enable its reuse within the industry.

scholarly journals Comparison of novel Ziziphus lotus adsorbent and industrial carbon on methylene blue removal from aqueous solutions

2018 ◽  
Vol 78 (10) ◽  
pp. 2055-2063
Author(s):  
Asmaa Msaad ◽  
Mounir Belbahloul ◽  
Samir El Hajjaji ◽  
Abdeljalil Zouhri
Keyword(s):  
Methylene Blue ◽  
Activated Carbon ◽  
Aqueous Solutions ◽  
Low Cost ◽  
Sorption Process ◽  
Second Order ◽  
Order Kinetic ◽  
Industrial Carbon ◽  
Freundlich Isotherms ◽  
Pseudo Second Order

Abstract In this work, the use of a novel low-cost adsorbent derived from Ziziphus lotus (ZL) and industrial carbon (IC) has been successfully applied to the removal of methylene blue (MB) from aqueous solutions. The efficiency of this material was studied through Lagergren pseudo-first-order and pseudo-second-order kinetic models. The process for the novel activated carbon and the IC were best represented by the pseudo-second-order rate model. Langmuir and Freundlich isotherms were used to describe the sorption equilibrium data. The Langmuir model turned out to be the most adequate and maximum capacities were measured to be 833.33 and 142.85 mg.g−1 for ZL activated carbon and IC from Sigma Aldrich, respectively. The thermodynamic study revealed that the sorption process is spontaneous and endothermic for the two adsorbents. To explain the effectiveness of MB removal, ZL activated carbon was characterized by scanning electron microscopy, Brunauer–Emmett–Teller surface area, X-ray diffraction and Fourier transform infrared spectroscopy.

scholarly journals Equilibrium, kinetic and thermodynamic studies on methylene blue adsorption by Trichosanthes kirilowii Maxim shell activated carbon

2019 ◽  
Vol 21 (4) ◽  
pp. 89-97 ◽  
Author(s):  
Yuqi Wang ◽  
Yanhui Li ◽  
Heng Zheng
Keyword(s):  
Methylene Blue ◽  
Activated Carbon ◽  
Kinetic Studies ◽  
Bet Surface Area ◽  
Maximum Adsorption Capacity ◽  
Koh Activation ◽  
Order Kinetic ◽  
Freundlich Isotherms ◽  
Adsorbent Surface ◽  
Trichosanthes Kirilowii

Abstract New kind of adsorbent was produced from Trichosanthes kirilowii Maxim shell. The KOH activation technology for preparation of Trichosanthes kirilowii Maxim shell activated carbon (TKMCK) was optimized. Using methylene blue as the sample adsorbate, the adsorption behavior was systematically investigated in terms of the activation agent and temperature, the adsorption temperature and time, the initial adsorbate pH and concentration, as well as the dosage of adsorbent. Surface physical morphology of the TKMCK prepared was observed by scanning electron microscopy (SEM), while the functional groups were determined with Fourier transform infrared (FTIR) spectra. Kinetic studies indicated that the adsorption process was more consistent with the pseudo-second-order kinetic. Both Langmuir and Freundlich isotherms were employed to fit the adsorption data at equilibrium, with the former giving a maximum adsorption capacity of 793.65 mg/g at 323 K. BET surface area of as-prepared TKMCK was 657.78 m2/g.

scholarly journals Removal of Methylene Blue Dye from Synthetic Wastewater using Kenaf Core and Activated Carbon

2018 ◽  
Vol 7 (4.19) ◽  
pp. 909 ◽  
Author(s):  
Saleem Ethaib ◽  
Iqbal K. Erabee ◽  
Ali A. Abdulsahib
Keyword(s):  
Methylene Blue ◽  
Activated Carbon ◽  
Low Cost ◽  
Correlation Coefficients ◽  
Freundlich Isotherm ◽  
Morphological Properties ◽  
Synthetic Wastewater ◽  
Blue Dye ◽  
Freundlich Isotherms ◽  
Kenaf Core

The removal of textile-based cationic methylene blue (MB) dye from synthetic wastewater was investigated in batch model using low cost agro-based adsorbents named Kenaf core, and the activated carbon. A comparative analysis between these adsorbents was defined via pH, adsorbent dose and contact time on adsorption process, and morphological properties. In addition, isotherms adsorption studies were estimated for determination of the equilibrium adsorption capacity. The experimental observation showed that the optimum pH values for Kenaf core and the activated carbon were 6 and 4 respectively. Meanwhile the optimum adsorbent dosage values for Kenaf and the activated carbon were 1.5g for both. The results showed that a high adsorption efficiency for Kenaf core which was about 84% and 92 % for activated carbon. The correlation coefficients (𝑅2) for kenaf core were equal to 0.8789 and 89 for Langmuir and Freundlich isotherm, respectively. Meanwhile, the correlation coefficients (𝑅2) for activated carbon were equal were 0.8974 and 0.7643 for Langmuir and Freundlich isotherms, respectively. The results illustrated that the Kenaf core has a porous and an irregular surface area which make it a suitable adsorbent for dyes in the wastewater. 

Removal of Cationic Dye from Aqueous Solution by Adsorption on Activated Carbon Developed from Xanthoceras Sorbifolia Bunge Hull

2010 ◽  
Vol 123-125 ◽  
pp. 367-370 ◽  
Author(s):  
Yi Nan Hao ◽  
Xi Ming Wang ◽  
Fang Liang Pang
Keyword(s):  
Activated Carbon ◽  
Contact Time ◽  
Chloride Solution ◽  
Equilibrium Concentration ◽  
Cationic Dye ◽  
Zinc Chloride Solution ◽  
Freundlich Isotherms ◽  
Langmuir And Freundlich Isotherms ◽  
Different Temperatures ◽  
Endothermic Process

Adsorption of cationic dye, methylene blue (MB) onto Xanthoceras Sorbifolia Bunge hull activated carbon (XSBHAC) developed by zinc chloride solution activation has been investigated. Exp eriments were carried out as function of contact time, pH (2-10) and temperature (293, 303, 313 and 323K). Adsorption isotherms were modeled with the Langmuir and Freundlich isotherms. The data fitte d well with the Langmuir isotherm. The Langmuir monolayer saturation capacities of MB adsorbed onto activated carbon were 501.32, 534.54, 588.30 and 593.28mg/g at 293, 303,313, and 323 K, respect ively. The kinetic models were also studied. The rates of adsorption were found to conform to the pseu do-second-order kinetics with good correlation. Using the equilibrium concentration contents obtained at different temperatures, various thermodynamic parameters, such as△G, △H and△S, have been calc ulated.The thermodynamics parameters of system indicated spontaneous and endothermic process.

scholarly journals Removal of Methylene Blue by Adsorption onto Activated Carbon From Coconut Shell (Cocous Nucifera L.)

2019 ◽  
Vol 4 (2) ◽  
pp. 229-240 ◽  
Author(s):  
Rifki Husnul Khuluk ◽  
Ali Rahmat ◽  
Buhani Buhani ◽  
Suharso Suharso
Keyword(s):  
Methylene Blue ◽  
Activated Carbon ◽  
Surface Morphology ◽  
Chemical Activation ◽  
Coconut Shell ◽  
Physical Activation ◽  
Freundlich Isotherms ◽  
Optimum Ph ◽  
Isotherm Adsorption ◽  
Coconut Shells

This research has been conducted on process of production activated carbon from coconut shells, which are activated both physics and chemistry to improve the adsorption of methylene blue. The process of physical activation was done by burning the coconut shell using a furnace at a temperature of 700°C. The chemical activation was done using H3PO4 activator. The result of activated carbon physical activation (CAP) has a greater absorbency than activated carbon chemical activation (CAC) with each of the absorption of methylene blue at 99.42 and 98.64%. Analysis of surface morphology on the adsorbent was performed using a Scanning Electron Microscope (SEM). SEM results indicated that (CAP) has a surface morphology that is relatively similar to commercial activated carbon (CACm). Adsorption test was conducted on the determination of the optimum pH, adsorption rate, and isotherm adsorption of methylene blue. The results of the optimum pH on CAC, CAP, and CACm respectively obtained at pH 8 and the optimum contact time is obtained respectively at 40, 60, and 80 minutes. Adsorption kinetics data of methylene blue on CACm, CAP, and CAC tend to follow the pseudo second order kinetics with a correlation coefficient (R2) is 0.937; 0.950; and 0.999, respectively. Adsorption isotherm of methylene blue on CACm, CAP, and CAC tend to follow the model of Freundlich isotherms.

scholarly journals Removal of Direct Yellow-12 Dye from Water by Adsorption on Activated Carbon Prepared fromFicus RacemosaL.

2011 ◽  
Vol 8 (4) ◽  
pp. 1536-1545 ◽  
Author(s):  
G. Revathi ◽  
S. Ramalingam ◽  
P. Subramaniam ◽  
A. Ganapathi
Keyword(s):  
Activated Carbon ◽  
Acidic Ph ◽  
Freundlich Isotherms ◽  
Major Mode ◽  
Langmuir And Freundlich Isotherms ◽  
Adsorption Data ◽  
Ficus Racemosa ◽  
Temperature Equilibrium ◽  
Agitation Time ◽  
Adsorbent Dose

The adsorption of direct yellow-12 dye (DY-12) by Atti leaf (Ficus racemosa) powder carbon (ATC) was carried out by varying the parameters such as agitation time, dye concentration, adsorbent dose, pH and temperature. Equilibrium adsorption data followed both Langmuir and Freundlich isotherms. Adsorption followed second-order kinetics. The adsorption capacity was found to be 6.7 mg dye per gram of the adsorbent. Acidic pH was favorable for the adsorption of DY-12. Desorption studies suggest that chemisorptions might be the major mode of adsorption.

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