Immobilization of fluoride in artificially contaminated kaolinite by the addition of commercial-grade magnesium oxide

Suzuki, Tsuneo; Nakamura, Akira; Niinae, Masakazu; Nakata, Hideki; Fujii, Hiroshi; Tasaka, Yukio

doi:10.1016/j.cej.2013.08.042

Cited by 21 publications

(16 citation statements)

References 27 publications

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“…Investigating the behavior of fluoride in the water-kaolinite-MgO system with aim to evaluate the use of commercial-grade MgO as a fluoride immobilization agent, Suzuki et al [ 151 ] reported that fluoride adsorption on kaolinite is strongly pH-dependent and better results were obtained at lower pH. When MgO was dosed (dosages ranging from 25 mg to 400 mg in 20 mL of fluoride solution with initial concentration of 100 mg/L), authors observed a strong increase in the aqueous pH, i.e.…”

Section: Adsorbents For Fluoride Removalmentioning

confidence: 99%

A Review on Adsorption of Fluoride from Aqueous Solution

Ravančić²,

2014

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Fluoride is one of the anionic contaminants which is found in excess in surface or groundwater because of geochemical reactions or anthropogenic activities such as the disposal of industrial wastewaters. Among various methods used for defluoridation of water such as coagulation, precipitation, membrane processes, electrolytic treatment, ion-exchange, the adsorption process is widely used. It offers satisfactory results and seems to be a more attractive method for the removal of fluoride in terms of cost, simplicity of design and operation. Various conventional and non-conventional adsorbents have been assessed for the removal of fluoride from water. In this review, a list of various adsorbents (oxides and hydroxides, biosorbents, geomaterials, carbonaceous materials and industrial products and by-products) and its modifications from literature are surveyed and their adsorption capacities under various conditions are compared. The effect of other impurities on fluoride removal has also been discussed. This survey showed that various adsorbents, especially binary and trimetal oxides and hydroxides, have good potential for the fluoride removal from aquatic environments.

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Section: Adsorbents For Fluoride Removalmentioning

confidence: 99%

A Review on Adsorption of Fluoride from Aqueous Solution

Ravančić²,

2014

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“…Compared to other methods (e.g., precipitation-coagulation process and membrane hybrid system), adsorption for fluoride removal from water has attracted considerable attention due to its low cost, high stability, and simple operation and design [7,8]. Magnesia (MgO) has been widely investigated as an adsorbent to remove fluoride because: (1) it presents high defluoridation capacity; (2) its cost is low; and (3) the high pHzpc of MgO (12.1-12.7) can enhance the fluoride adsorption because of electrostatic attraction when the pH value of solution is lower than that of the isoelectric point [9,10]. However, several drawbacks may negatively affect its application for the fluoride removal such as minimum, equilibrated time of 60 min [11].…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, even though many modified MgO adsorbents have high adsorption capacity for fluoride ions, the adsorption performance is seriously influenced by increasing pH [12][13][14][16][17][18]. By contrast, effective fluoride removal through MgOP can be achieved over a wide pH range (3)(4)(5)(6)(7)(8)(9)(10)(11)(12). This can increase the practical application prospects of MgOP for the fluoride removal.…”

Section: Introductionmentioning

confidence: 99%

Defluoridation by magnesia–pullulan: Surface complexation modeling and pH neutralization of treated fluoride water by aluminum

Liu

Jiang

et al. 2018

Journal of the Taiwan Institute of Chemical Engineers

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The magnesia-pullulan composite (MgOP) achieved effective fluoride removal in previous research. In the present study, an acid-base titration experiment was conducted to investigate the properties of MgOP surface and further explore the mechanism of fluoride adsorption on MgOP. Results showed that the presence of chloride ions could improve fluoride adsorption on MgOP; however, additional nitrate ions had negligible impacts. A diffuse layer model and chemical equilibrium software (Visual MINTEQ 3.1) were used to simulate the acid-base titration data. The effects of initial pH values on the rate of fluoride uptake by MgOP were also studied. Moreover, aluminum salts were added to the fluoride solution with MgOP for the pH neutralization of treated water, in which aluminum chloride was preferred.

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“…As a non‐toxic, inexpensive, and commonly available material, MgO has already been widely tested to treat As(III) and As(V) contaminated water. However, its adsorption performance, resulting from the formation of magnesium hydroxide (Mg(OH) 2 ) on their surface, is limited in alkaline conditions (pH > 10), and for this reason MgO cannot be used as a direct arsenic adsorbent. At this pH range, removal of the arsenic–brucite complex by conventional means, including filtration, settling or centrifugation, is also hindered by the tendency of Mg(OH) 2 to become a paste or slurry.…”

Section: Introductionmentioning

confidence: 99%

Regeneration of arsenic spent adsorbents by Fe/MgO nanoparticles

Simeonidis

Martínez-Boubeta²,

Rivera-Gil

et al. 2017

J of Chemical Tech & Biotech

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BACKGROUND Over recent decades, there has been increasing global concern over public health impacts related to water pollution with arsenic. With the development of nanotechnology, nanomaterials are being proposed as alternative agents for water treatment. This study focuses on the use of core‐shell nanoparticles as secondary receptors able to operate under intense conditions and perform efficient yet environmentally friendly regeneration of conventional adsorbents. RESULTS Hybrid MgO‐coated Fe nanoparticles are proposed, optimized to achieve maximum arsenic uptake under a strong alkaline environment, such as the NaOH stream used to regenerate a typical oxy‐hydroxide adsorption column. The magnetic response of these nanocomposites enables their recovery and recirculation by means of an external magnetic field. A scalable laboratory continuous flow system was designed as a proof‐of‐concept to provide maximum efficiency of the recirculating nanoparticles, as well as complete reuse of the alkaline washing solution. A risk assessment scheme was conducted to evaluate the potential environmental impact of nanoparticle residues by testing the toxicity of arsenic‐loaded materials in RTgill‐W1 cells and their inertization into concrete building blocks. CONCLUSION The presented methodology illustrates a way to incorporate nanoparticles in water technology taking advantage of their surface activity and magnetic separation potential. © 2016 Society of Chemical Industry

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Immobilization of fluoride in artificially contaminated kaolinite by the addition of commercial-grade magnesium oxide

Cited by 21 publications

References 27 publications

A Review on Adsorption of Fluoride from Aqueous Solution

A Review on Adsorption of Fluoride from Aqueous Solution

Defluoridation by magnesia–pullulan: Surface complexation modeling and pH neutralization of treated fluoride water by aluminum

Regeneration of arsenic spent adsorbents by Fe/MgO nanoparticles

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