Removal efficiency of fluoride by novel Mg-Cr-Cl layered double hydroxide by batch process from water

Mandal, Sandip; Tripathy, Swagatika; Padhi, T.; Sahu, Manoj Kumar; Patel, Raj Kishore

doi:10.1016/s1001-0742(12)60146-6

Cited by 58 publications

(11 citation statements)

References 33 publications

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“…Indeed, Mg-Al LDH intercalated with CO 3 2− (CO 3 ‧Mg-Al LDH) is known to remove F from aqueous solutions [5,6], as can Zn-Al and Mg-Cr LDHs, intercalated with Cl − [7,8], and cellulose-supported Zn-Al LDHs [9]. In addition, selective F removal has been achieved in protein systems with biocarbon-Mg-Al LDHs [10].…”

mentioning

confidence: 99%

Recyclable Mg–Al layered double hydroxides for fluoride removal: Kinetic and equilibrium studies

Kameda

Oba

Yoshioka

2015

Journal of Hazardous Materials

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mentioning

confidence: 99%

Recyclable Mg–Al layered double hydroxides for fluoride removal: Kinetic and equilibrium studies

Kameda

Oba

Yoshioka

2015

Journal of Hazardous Materials

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“…Freundlich adsorption model, on the other hand, dealt with nonideal adsorption onto heterogeneous surfaces involving multilayer sorption. The equations of these models were as follows :

\frac{C_{e}}{{normalq}_{normale}} = \frac{1}{K_{L} q_{m}} + \frac{C_{e}}{q_{m}}

{l n q}_{normale} = l n K_{F} + \frac{1}{n} l n C_{e}

where C e (mg·L −1 ) was the equilibrium concentration of fluoride in solution, q e (mg·g −1 ) was the maximum monolayer adsorption capacity, and K L (L·mg −1 ) was the Langmuir constant, K F (L/g) and n were the Freundlich constants, indicating the adsorption capacity and the adsorption intensity, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…Freundlich adsorption model, on the other hand, dealt with nonideal adsorption onto heterogeneous surfaces involving multilayer sorption. The equations of these models were as follows [37][38][39]:…”

Section: Adsorption Isotherms and Thermodynamicsmentioning

confidence: 99%

Adsorptive removal of fluoride using hierarchical flower‐like calcined Mg–Al layered double hydroxides

Wang

et al. 2016

Env Prog and Sustain Energy

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Fluoride is the naturally occurring groundwater contaminant around the world, and has been the focus of extensive research efforts in the past few decades. Among various fluoride removal technologies, adsorption was the most attractive because it was highly efficient, cost‐effective, and suitable for small communities. A facile synthetic approach was presented for hierarchical flower‐like Mg–Al‐layered double hydroxides (MgAl‐LDO) via the simple hydrothermal method, followed by a subsequent calcination at 500°C for 4 h in air. The resulting calcined MgAl‐LDO were studied for their adsorption performance in removing fluoride from aqueous solutions. The results showed that the flower‐like sphere of hierarchical calcined MgAl‐LDO was synthesized by a simple hydrothermal method using urea as precipitating agent. Batch adsorption experiments demonstrated that the kinetic adsorption could be described by a pseudo‐second‐order model very well. The adsorption of fluoride on MgAl‐LDO was strongly dependent on pH value. The Freundlich model fitted the adsorption isotherms of fluoride better than the Langmuir model at three different temperatures of 25, 45, and 65°C. They were demonstrated to be reusable with the efficiency of fluoride removal up to 80% at the fourth cycle. we successfully fabricated flower‐like spherical structures MgAl‐LDO by a facile hydrothermal method without any templates. It was envisioned that the synthesized samples using this facile synthetic approach were very promising for the removal of fluoride from aqueous solutions. © 2016 American Institute of Chemical Engineers Environ Prog, 2016 © 2016 American Institute of Chemical Engineers Environ Prog, 35: 1420–1429, 2016

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“…One is layered double hydroxides (LDHs) with a general formula of [M II 1−z M III z(OH) 2 ](A m− ) z/m ·nH 2 O, where M II is a divalent cation such as Mg 2+ , Fe 2+ , Ni 2+ , Zn 2+ , or Co 2+ ; M III is a trivalent cation such as Al 3+ , Cr 3+ , Fe 3+ , or Ga 3+ ; and A m− is an exchangeable anion such as CO 3 − , NO 3 − , OH − , X − , etc. The z is the molecular ratio of M 3+ /(M 2+ + M 3+ ), generally ranging between 0.2 and 0.4 [16,17,21,22,23,24,25,26]. LHDs with highly positive surface charge, low costs and large area have been demonstrated as good adsorbents to effectively remove acidic or negatively charged compounds and are a desirable carrier for drug or biomolecule delivery [27,28,29,30].…”

Section: Introductionmentioning

confidence: 99%

A Facile Synthesis of Core-Shell SiO2@Cu-LBMS Nano-Microspheres for Drug Sustained Release Systems

2019

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A well-dispersed SiO2@Layered hydroxide cupric benzoate (SiO2@Cu-LBMS) with a hierarchical structure have been synthesized by a facile method. The layered hydroxide cupric benzoate with a structure of layered basic metal salt (Cu-LBMS) was directly deposited on the surface of silica spheres without any blinder. The morphology of the SiO2@Cu-LBMS nano-microsphere was observed by SEM, and the reaction conditions was also discussed. In addition, the XRD patterns and FTIR spectra provide consistent evidence to the formation of SiO2@Cu-LBMS nano-microspheres. The release behavior and drug loading capability of SiO2@Cu-LBMS microspheres were also investigated by using ibuprofen, aspirin and salicylic acid as model drugs. The results indicated that the drug loading capability of SiO2@Cu-LBMS nano-microspheres was much larger than layered hydroxide cupric benzoate, and the releasing time was significantly prolonged than layered hydroxide cupric benzoate and their physical mixture.

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Removal efficiency of fluoride by novel Mg-Cr-Cl layered double hydroxide by batch process from water

Cited by 58 publications

References 33 publications

Recyclable Mg–Al layered double hydroxides for fluoride removal: Kinetic and equilibrium studies

Recyclable Mg–Al layered double hydroxides for fluoride removal: Kinetic and equilibrium studies

Adsorptive removal of fluoride using hierarchical flower‐like calcined Mg–Al layered double hydroxides

A Facile Synthesis of Core-Shell SiO2@Cu-LBMS Nano-Microspheres for Drug Sustained Release Systems

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