Kinetics of adsorption of methylene blue and rhodamine 6G on acrylic acid-based superabsorbents

2012 ◽  
Vol 126 (2) ◽  
pp. 463-472 ◽  
Author(s):  
Neelesh Bharti Shukla ◽  
Giridhar Madras
Keyword(s):  
Methylene Blue ◽  
Acrylic Acid ◽  
Rhodamine 6G ◽  
Kinetics Of Adsorption ◽  
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.

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 Fabrication of reduced graphene oxide decorated with CuS nanoparticles and its activity toward the adsorption of Methylene Blue

2018 ◽  
Vol 83 (4) ◽  
pp. 503-513 ◽  
Author(s):  
Johra Tuz ◽  
Woo-Gwang Jung
Keyword(s):  
Methylene Blue ◽  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
High Surface ◽  
High Surface Area ◽  
Kinetics Of Adsorption ◽  
Reduced Graphene ◽  
High And Low Temperatures ◽  
Cus System ◽  
Kinetics Of

Reduced graphene oxide (RGO) can act as an adsorbent because of its high surface area. The adsorptive characteristics of a RGO composite combined with CuS were studied quantitatively. The removal efficiency of Methylene Blue was found to be about 85%, which is higher than that of bare CuS (?73%). Furthermore, the kinetics of adsorption of Methylene Blue was inspected to determine the rate of the process. The removal process was faster with the RGO?CuS system than with bare CuS. Both high and low temperatures were not favorable for this adsorption process. In highly ionic media of high or low pH, the adsorption was greater than in media of neutral pH. Thermodynamic parameters were calculated in this study and they suggest that this is physisorption and exothermic in nature.

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