LDH-MgAl-NO3 synthesis with the intervention of ethylenediamine intended for the removal of fluoride ions from aqueous solution

MRS Advances ◽  
2021 ◽  
Author(s):  
J. C. Coyote-Jiménez ◽  
R. E. Zavala-Arce ◽  
M. L. Jiménez-Núñez ◽  
J. L. García-Rivas ◽  
N. A. Rangel-Vázquez ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Fluoride Ions

Kinetic and equilibrium studies of fluoride sorption onto surfactant-modified smectites

Clay Minerals ◽  
2012 ◽  
Vol 47 (4) ◽  
pp. 429-440 ◽  
Author(s):  
S. Gamoudi ◽  
N. Frini-Srasra ◽  
E. Srasra
Keyword(s):  
Aqueous Solution ◽  
Thermodynamic Parameters ◽  
Adsorption Kinetics ◽  
Equilibrium Constants ◽  
Second Order ◽  
Operating Conditions ◽  
Polluted Water ◽  
Isotherm Models ◽  
Fluoride Ions ◽  
Pseudo Second Order

AbstractThe use of organoclays as adsorbents in the remediation of polluted water has been the subject of many recent studies. In the present work, a Tunisian smectite modified with two cationic surfactants was used as an adsorbent to examine the adsorption kinetics, isotherms and thermodynamic parameters of fluoride ions from aqueous solution. Various pH values, initial concentrations and temperatures have been tested. Two simplified kinetic models, first-order and pseudo-second-order, were used to predict the adsorption rate constants. It was found that the adsorption kinetics of fluoride onto modified smectites at different operating conditions can best be described by the pseudo-second-order model. Adsorption isotherms and equilibrium adsorption capacities were determined by the fitting of the experimental data to well known isotherm models including those of Langmuir and Freundlich. The results showed that the Langmuir model appears to fit the adsorption better than the Freundlich adsorption model for the adsorption of fluoride ions onto modified smectites. The equilibrium constants were used to calculate thermodynamic parameters, such as the change of free energy, enthalpy and entropy. Results of this study demonstrated the effectiveness and feasibility of organoclays for the removal of fluoride ions from aqueous solution.

Rapid and efficient removal of fluoride ions from aqueous solution using a polypyrrole coated hydrous tin oxide nanocomposite

2016 ◽  
Vol 476 ◽  
pp. 103-118 ◽  
Author(s):  
Kamya Parashar ◽  
Niladri Ballav ◽  
Sushanta Debnath ◽  
Kriveshini Pillay ◽  
Arjun Maity
Keyword(s):  
Aqueous Solution ◽  
Tin Oxide ◽  
Efficient Removal ◽  
Fluoride Ions

Removal of fluoride ions from aqueous solution at low pH using schwertmannite

2008 ◽  
Vol 152 (2) ◽  
pp. 571-579 ◽  
Author(s):  
Akbar Eskandarpour ◽  
Maurice S. Onyango ◽  
Aoyi Ochieng ◽  
Shigeo Asai
Keyword(s):  
Aqueous Solution ◽  
Low Ph ◽  
Fluoride Ions

scholarly journals Coumarin Probe for Selective Detection of Fluoride Ions in Aqueous Solution and Its Bioimaging in Live Cells

Sensors ◽  
2018 ◽  
Vol 18 (7) ◽  
pp. 2042 ◽  
Author(s):  
Kantapat Chansaenpak ◽  
Anyanee Kamkaew ◽  
Oratai Weeranantanapan ◽  
Khomson Suttisintong ◽  
Gamolwan Tumcharern
Keyword(s):  
Aqueous Solution ◽  
Live Cells ◽  
Selective Detection ◽  
Fluoride Ions

scholarly journals The Complexing of Cerium(III), Lanthanum(III) and Gadolinium(III) by Fluoride Ions in Aqueous Solution

1957 ◽  
Vol 61 (7) ◽  
pp. 1021-1021 ◽  
Author(s):  
J. W. Kury ◽  
Z. Z. Hugus ◽  
W. M. Latimer
Keyword(s):  
Aqueous Solution ◽  
Fluoride Ions

scholarly journals Assessment of the Use of Epicarp and Mesocarp of Green Coconut for Removal of Fluoride Ions in Aqueous Solution

2019 ◽  
Vol 2019 ◽  
pp. 1-8 ◽  
Author(s):  
César Augusto Canciam ◽  
Nehemias Curvelo Pereira
Keyword(s):  
Aqueous Solution ◽  
Thermodynamic Parameters ◽  
Removal Efficiency ◽  
Langmuir Isotherm ◽  
Adsorption Process ◽  
Fluoride Ions ◽  
Residual Biomass ◽  
Endothermic Process ◽  
Langmuir Isotherm Model ◽  
Biomass Transformation

Fruit consumption and processing result in considerable volumes of residual biomass. Transformation of this biomass into biosorbents offers an alternative for its reuse and disposal. As the green coconut shell is a waste often discarded in landfills and dumps, generating gases and leachate, two biosorbents were developed from the epicarp and mesocarp of green coconut to adsorb fluoride ions in aqueous solution. The kinetic experiments showed that sorption of fluoride ions reached equilibrium at 300 min for both epicarp and mesocarp at temperatures of 25°C, 35°C, and 45°C. The removal efficiency of fluoride ions varied from 66.25% (at 25°C) to 77.50% (at 45°C) for the epicarp and from 90% (at 25°C) to 97.50% (at 45°C) for the mesocarp. The thermodynamic parameters of the adsorption process showed that adsorption is a spontaneous, endothermic process for both biosorbents. The adsorption was classified as chemical, with the Langmuir isotherm model best suited to the adsorption isotherms data.

Adsorption of fluoride from aqueous solution by enhanced chitosan/bentonite composite

2013 ◽  
Vol 68 (9) ◽  
pp. 2074-2081 ◽  
Author(s):  
Qian Liu ◽  
Ruihua Huang ◽  
Bingchao Yang ◽  
Yanping Liu
Keyword(s):  
Aqueous Solution ◽  
Ph Value ◽  
Fluoride Concentration ◽  
Operating Conditions ◽  
Optimum Operating ◽  
Fluoride Removal ◽  
Fluoride Ions ◽  
Adsorbent Dosage ◽  
Batch System ◽  
Monolayer Adsorption

In this work, enhanced chitosan/bentonite composite was prepared by treating chitosan/bentonite composite with concentrated hydrochloric acid (HCl). The adsorption of fluoride ions from aqueous solution onto the enhanced chitosan/bentonite composite was investigated. Adsorption studies were performed in a batch system, and the effects of various parameters, such as the pH value of the solution, adsorbent dosage and initial fluoride concentration, were evaluated. The optimum operating conditions for fluoride removal by the enhanced chitosan/bentonite composite were pH = 7 or so, and adsorbent dosage =1.2 g. Increasing initial fluoride concentration reduced the adsorption of fluoride onto the enhanced chitosan/bentonite composite. Furthermore, the presence of other co-anions weakened the adsorption of fluoride onto this adsorbent. The equilibrium adsorption isotherms were well described by both the Freundlich and Langmuir models. The maximum monolayer adsorption capacity was 2.95 mg/g at 293 K.

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