Optimization of fluoride removal from aqueous solution by Al 2 O 3 nanoparticles

Hafshejani, Laleh Divband; Tangsir, Sareh; Daneshvar, Ehsan; Maljanen, Marja; Lähde, Anna; Jokiniemi, Jorma; Naushad, Mu.; Bhatnagar, Amit

doi:10.1016/j.molliq.2017.04.104

Cited by 55 publications

(13 citation statements)

References 45 publications

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“…The Ho (pseudo-second-order) rate equation is given as [12,18]:tqt = 1K2 + 1qetWhere q e (mg g −1 ) and q t (mg g −1 ) are the amounts of fluoride adsorbed at equilibrium and at time t, respectively, K 1 (min −1 ) is the pseudo-first-order rate constant of adsorption, and K 2 (g mg −1 min −1 ) is the pseudo-second-order rate constant.…”

Section: Isotherm and Kinetic Modelingmentioning

confidence: 99%

Data on the removal of fluoride from aqueous solutions using synthesized P/γ-Fe2O3 nanoparticles: A novel adsorbent

et al. 2019

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Section: Isotherm and Kinetic Modelingmentioning

confidence: 99%

Data on the removal of fluoride from aqueous solutions using synthesized P/γ-Fe2O3 nanoparticles: A novel adsorbent

et al. 2019

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“…To date, many synthetic single and multicomponent metal oxides have been reported, such as aluminum oxide, 17 magnesium oxide, 18 Mn−Ce, 19 Mn−Zr, 20 Fe−Al, 21 Fe−Ti, 22 Fe−Ca−Ce, 23 and Fe−Al−Ce. 24 Most of the reported multicomponent composites were iron or aluminum-based metallic oxides and their improved adsorption properties resulted from the synergistic reactions among the component species.…”

Section: Introductionmentioning

confidence: 99%

Adsorption Equilibrium, Kinetics, and Thermodynamic Studies of Fluoride Adsorbed by Tetrametallic Oxide Adsorbent

2018

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This study investigated the performance of fluoride adsorption onto a specific tetrametallic oxide adsorbent Fe–Al–Ce-Ni (FACN) and the effect of temperature on adsorption performance. The adsorption performance was determined by adsorption equilibrium, kinetics, and thermodynamic parameters. The adsorption, kinetic, and thermodynamic parameters were compared alternatively. The fluoride adsorption capacity was obtained from four different adsorption isotherm models, namely, Langmuir, Freundlich, Temkin, and Dubinin–Radushkevich (D–R), and Freundlich was found to best fit model. Fluoride removal rate using adsorption (0.27 min–1) was obtained faster than reactive adsorption (0.04 min–1). Several thermodynamic parameters such as enthalpy, Gibbs free energy, entropy (ΔS > 0), and adsorption activation energy were calculated which demonstrated the feasibility and spontaneity (ΔG < 0) and exothermic nature of (ΔH < 0) the fluoride adsorption process. The adsorption process was controlled by a physical mechanism, and the maximum adsorption capacity was found to be 250 mg/g. To our knowledge, this is the first report on the synthesis of tetrametallic oxide adsorbent for fluoride adsorption, and the feasibility of the adsorption process was ratified by three van’t Hoff plots.

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“…Typically, aluminum hydroxide is first prepared by electrolysis or pyrolysis and then partially converted to aluminum oxide by calcination. One of the advantages of aluminum oxide/hydroxide adsorbents is the large specific surface area ( Hafshejani et al, 2017 ), as shown in Table 1 , and in general, S BET > 200 m 2 /g. Generally, high pH PZC allows its surface to appear positively charged in water ( Dhawane et al, 2018 ).…”

Section: Conventional Types Of Adsorbentsmentioning

confidence: 99%

Synergistic Fluoride Adsorption by Composite Adsorbents Synthesized From Different Types of Materials—A Review

Wei

Wang

et al. 2022

Front. Chem.

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The reduction of fluoride concentrations in water is one of many concerns. Adsorption is the most widely used technology for fluoride removal and the center to development of adsorption technology is the improvement of adsorbents. This review classifies the typical fluoride removal adsorbents into four types: metal oxides/hydroxides, biopolymers, carbon-based, and other adsorbents. The exploitation of new materials and the synthesis of composite materials are two ways of developing new adsorbents. In comparison to the discovery of novel adsorbents for fluoride adsorption, research into the composite synthesis of different types of conventional adsorbents has proliferated in recent years. The traditional adsorbents used the earliest, metal oxides, can act as active centers in a wide range of applications for modifying and compounding with other types of adsorbents. This study emphasizes reviewing the research on fluoride removal by composite adsorbents synthesized from different types of metal-modified materials. Seven factors were compared in terms of material characterization, initial fluoride concentration, adsorbent dose, pH, temperature, reaction time, and maximum adsorption capacity. The modification of composite adsorbents is facile and the synergistic effect of the different types of adsorbents significantly improves fluoride adsorption capacity. Metal composite adsorbents are synthesized by facile coprecipitation, hydrothermal, or impregnation modification methods. The adsorption mechanisms involve electrostatic attraction, ion exchange, complexation, and hydrogen bonding. The fluoride adsorption capacity of composite adsorbents has generally improved, indicating that most modifications are successful and have application prospects. However, to achieve significant breakthroughs in practical applications, numerous issues such as cost, separation/regeneration performance, and safety still need to be considered.

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Optimization of fluoride removal from aqueous solution by Al 2 O 3 nanoparticles

Cited by 55 publications

References 45 publications

Data on the removal of fluoride from aqueous solutions using synthesized P/γ-Fe2O3 nanoparticles: A novel adsorbent

Data on the removal of fluoride from aqueous solutions using synthesized P/γ-Fe2O3 nanoparticles: A novel adsorbent

Adsorption Equilibrium, Kinetics, and Thermodynamic Studies of Fluoride Adsorbed by Tetrametallic Oxide Adsorbent

Synergistic Fluoride Adsorption by Composite Adsorbents Synthesized From Different Types of Materials—A Review

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