Aluminum (hydr)oxide coated pumice for fluoride removal from drinking water: Synthesis, equilibrium, kinetics and mechanism

The fluoride adsorption on aluminum hydroxide coated rice husk ash material (RHA/Al(OH) 3 ) was demonstrated in this study. The isothermal data indicated that the Langmuir model well described the adsorption system with the maximum monolayer adsorption capacity of 8.2 mg.g -1 . The kinetic results revealed that the pseudo-second-order rate model fitted the experiments data better than the pseudo-first-order one. Furthermore, the adsorption of fluoride onto this material may be the chemical adsorption. Thermodynamic parameters (∆G o and ∆H o ) in the range of temperature from 30 to 70 o C showed that the adsorption was a spontaneous and an endothermic process. RHA/Al(OH) 3 could be used for well-treatment of fluoride contaminated well-water sampling in Ninhhoa district (Khanhhoa province). With the initial content of fluoride of 10.1 mg.L -1 and after 2 hours of treating with the dose of 4.0 ÷ 7.0 g.L -1 , the concentration of fluoride in the samples decreased to 0.5 ÷ 1.5 g.L -1 , that met acceptable limit of WHO.

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“…In this research, the Langmuir and Freundlich isotherm models [7,8,9,10] were used to evaluated the adsorption.…”

Section: Adsorption Isothermmentioning

confidence: 99%

A Study on Kinetic and Thermodynamic Adsorption of Fluoride in Aqueous Solution Onto Aluminium Hydroxide Coated Rice Husk Ash

Tuyền

Quyên

Hải

et al. 2016

JST

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“…Various materials have been tested as possible adsorbents for the removal of arsenic and fluoride from water, like alumina, iron based oxides, rare metal oxides, activated carbon, and bone char to name a few [7,8]. In recent decades, there has been an increased interest in the application of nanomaterials in environmental applications such as in contaminant removal or toxicity mitigation [9].…”

Section: Introductionmentioning

confidence: 99%

Application of Iron Oxide and Iron Oxide/Alumina Nanocomposites for Arsenic and Fluoride Removal: A Comparative Study

Tc¹,

Sharma²,

Kennedy³

2018

IJTAN

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“…Various materials have been tested as possible adsorbents for the removal of arsenic and fluoride from water, like alumina, iron based oxides, rare metal oxides, activated carbon, bone char to name a few [5,6]. In recent decades, there has been increased interest in the application of nanomaterials in environmental applications such as in contaminant removal or toxicity mitigation [7].…”

Section: Introductionmentioning

confidence: 99%

Arsenic and Fluoride Removal by Iron Oxide and Iron Oxide/Alumina Nanocomposites: A Comparison

Tc¹,

Sharma²,

Kennedy³

2017

Proceedings of the 2nd World Congress on New Technologies

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-The study provides a comparative analysis of As (III), As (V) and F removal by iron oxide nanoparticles and iron oxide/alumina nanocomposites. The nanoparticles were characterized by particle size, zeta potential and Scanning Electron Microscopic analysis which showed spherical iron oxide nanoparticles around ~200 nm and nanocomposites around ~300 nm. Batch sorption studies carried out at varying initial concentrations of As and F revealed an enhanced F and As sorption capacity for the nanocomposites. The sorption isotherm showed that the data for As (III), As (V) and F fitted best to Freundlich isotherm for both the type of nanoparticles. The maximum sorption capacity of the iron oxide nanoparticles for As (III) and As (V) at pH 7 were 909 µg/g and 3333 µg/g while the comparative qm values for the nanocomposites were 1000 µg/g and 2500 µg/g respectively. The maximum F sorption capacity of iron oxide nanoparticles was 1.47 mg/g while it was 4.82 mg/g for the nanocomposites. The preliminary results of the study showed that the nanocomposites can be promising adsorbents for both As and F removal in small scale water systems.

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Aluminum (hydr)oxide coated pumice for fluoride removal from drinking water: Synthesis, equilibrium, kinetics and mechanism

Cited by 82 publications

References 54 publications

A Study on Kinetic and Thermodynamic Adsorption of Fluoride in Aqueous Solution Onto Aluminium Hydroxide Coated Rice Husk Ash

A Study on Kinetic and Thermodynamic Adsorption of Fluoride in Aqueous Solution Onto Aluminium Hydroxide Coated Rice Husk Ash

Application of Iron Oxide and Iron Oxide/Alumina Nanocomposites for Arsenic and Fluoride Removal: A Comparative Study

Arsenic and Fluoride Removal by Iron Oxide and Iron Oxide/Alumina Nanocomposites: A Comparison

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