Equilibrium and kinetics of adsorption of methylene blue on Ti-modified volcanic ashes

AIChE Journal ◽  
2010 ◽  
Vol 57 (3) ◽  
pp. 819-825 ◽  
Author(s):  
P. Esparza ◽  
M. E. Borges ◽  
L. Díaz ◽  
M. C. Alvarez-Galván ◽  
J. L. G. Fierro
Keyword(s):  
Methylene Blue ◽  
Kinetics Of Adsorption ◽  
Volcanic Ashes ◽  
Equilibrium And Kinetics ◽  
Kinetics Of

scholarly journals Study of the adsorption capacity of Fe(II) dissolved in water by using a mineral rich in Manganese Dioxide (MnO2) from Colombia

DYNA ◽  
2016 ◽  
Vol 83 (196) ◽  
pp. 223-228 ◽  
Author(s):  
Jhonnathan Machado-Infante ◽  
Gustavo Ramírez-Caballero ◽  
Martha Juliana Barajas Meneses
Keyword(s):  
Aqueous Solution ◽  
Raman Spectroscopy ◽  
Water Treatment ◽  
Adsorption Capacity ◽  
Open Systems ◽  
Kinetics Of Adsorption ◽  
Equilibrium And Kinetics ◽  
Pseudo Second Order ◽  
Potential Alternative ◽  
Kinetics Of

<p>In Colombia, a mineral rich in MnO<sub>2</sub> is extracted from the mines of Mallama, Nariño. In this work we studied the adsorption capacity of this mineral for Fe(II) dissolved in aqueous solution of open systems. The characterization was done through ICP-AES, XRF and Raman spectroscopy. The effect of different pretreatments on the mineral with oxidizing agents such as KMnO<sub>4</sub> and NaClO was evaluated. Studies of equilibrium and kinetics of adsorption showed that the mechanism fits well to the Langmuir isotherm and its kinetics to a model of pseudo-second order. At the conditions studied was found that the adsorption capacity for the mineral modified with KMnO<sub>4</sub> and NaOCl were 59.209 and 51.279 mg/g respectively. It is concluded that the mineral is a potential alternative in water treatment.</p>

Equilibrium and kinetics of adsorption of phosphate onto iron-doped activated carbon

2012 ◽  
Vol 19 (7) ◽  
pp. 2908-2917 ◽  
Author(s):  
Zhengfang Wang ◽  
Er Nie ◽  
Jihua Li ◽  
Mo Yang ◽  
Yongjun Zhao ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Kinetics Of Adsorption ◽  
Iron Doped ◽  
Equilibrium And Kinetics ◽  
Kinetics Of

scholarly journals Preparation of Activated Charcoal Adsorbent from Waste Tire

2012 ◽  
Vol 27 ◽  
pp. 19-25 ◽  
Author(s):  
Vinay Kumar Jha ◽  
Kiran Subedi
Keyword(s):  
Methylene Blue ◽  
Rate Constant ◽  
Activated Charcoal ◽  
Langmuir Model ◽  
Water Steam ◽  
Kinetics Of Adsorption ◽  
Waste Tire ◽  
Pseudo Second Order ◽  
Mathematical Equations ◽  
Kinetics Of

Activated charcoal was prepared from waste tire by using pyrolysis technique in three different atmospheres, viz, air, nitrogen and a combined atmosphere of nitrogen and water (steam). Methylene blue was then adsorbed on to these activated charcoals and the kinetics of adsorption was also studied. The adsorption isotherms of methylene blue were simulated by the mathematical equations of Langmuir and Freundlich. The Langmuir isotherms were found to have better fitting than that of Freundlich. The Qmax values obtained from Langmuir model were 0.032, 0.036, and 0.092 mmol/g for the activated charcoals prepared in air, nitrogen and nitrogen and water (steam), respectively. The overall reaction was found to be pseudo-second order with the rate constant of 4.2 × 10-2 L g/(mmolmin). The equilibrium adsorption value obtained from the kinetics data i.e. 0.072 (mmol/g) was found to be comparable with that obtained from Langmuir model.DOI: http://dx.doi.org/10.3126/jncs.v27i1.6437 J. Nepal Chem. Soc., Vol. 27, 2011 19-25Uploaded date: 16 July, 2012

scholarly journals A Solid-State Pathway towards the Tunable Carboxylation of Cellulosic Fabrics: Controlling the Surface’s Acidity

Membranes ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 514
Author(s):  
Eugenio H. Otal ◽  
Manuela L. Kim ◽  
Juan P. Hinestroza ◽  
Mutsumi Kimura
Keyword(s):  
Methylene Blue ◽  
Surface Modification ◽  
High Temperature ◽  
Solid State ◽  
Effect Of Temperature ◽  
Cationic Dye ◽  
Kinetics Of Adsorption ◽  
Starting Point ◽  
Reaction Proceeds ◽  
Kinetics Of

We report on a tunable solid-state approach to modify the acidity of cotton substrates using citric, oxalic, and fumaric acids. The first stage of the method involves soaking the cotton swatches in an ethanolic saturated solution of the corresponding acid. After drying, the carboxylation reaction proceeds at high temperature (T > 100 °C) and in solid state. We quantified the effect of temperature and reaction time on the solid-state carboxylation reaction, which allowed us to tune the carboxylation degree and the acidity of the surface. We characterized the modified cotton by performing adsorption isotherms and by determining the kinetics of adsorption of a cationic dye: methylene blue (MB). We found that the MB uptake kinetics varied as a function of the acidic strength of the surface, which is closely related to the strength of the acid used for surface modification. The proposed solid-state cotton carboxylation procedure allows us to achieve sustainable cotton modification, which constitutes a starting point for several applications using cotton as the substrate.

scholarly journals Batch study, equilibrium and kinetics of adsorption of naphthalene using waste tyre rubber granules

2014 ◽  
Vol 4 (1) ◽  
Author(s):  
Felix A. Aisien ◽  
Andrew N. Amenaghawon ◽  
Albert I. Adinkwuye
Keyword(s):  
Contact Time ◽  
Batch Adsorption ◽  
Order Kinetic ◽  
Kinetics Of Adsorption ◽  
Isotherm Equation ◽  
Operational Variables ◽  
Langmuir Isotherm Equation ◽  
Equilibrium And Kinetics ◽  
Waste Tyre ◽  
Kinetics Of

The potential use of waste tyre rubber granules (WTRG) for the batch adsorption of naphthalene from aqueous solutions was investigated. The effect of various operational variables such as contact time, initial naphthalene concentration, adsorbent dose, size of adsorbent particles, and temperature of solution on the adsorption capacity of WTRG was evaluated. The adsorption of naphthalene by WTRG was a fast kinetic process with an equilibrium contact time of 60 min. A low temperature (5°C), small adsorbent particle size (0.212 mm) and higher adsorbent dosage favored the adsorption process. Results of isotherm studies revealed that adsorption of naphthalene was best described by the Langmuir isotherm equation (R<sup>2</sup>=0.997) while the kinetics of the process was best described by the Lagergren pseudofirst order kinetic equation (R<sup>2</sup>=0.998). This study has demonstrated the suitability of WTRG for the removal of naphthalene from aqueous solution.

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