Development of Mg–Al–La tri-metal mixed oxide entrapped in alginate for removal of fluoride from wastewater

Wang, Aihe; Zhou, Kanggen; Liu, Xing; Liu, Fang

doi:10.1039/c7ra02566a

Cited by 35 publications

(7 citation statements)

References 38 publications

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“…Adsorption isotherms are represented as the number of adsorbate molecules per unit mass of adsorbent as a function of equilibrium concentration in bulk solution at a constant temperature. In this study, adsorption of fluoride onto FACN was carried out, and four isotherm models were tested, which are tabulated in Table S1, namely, Langmuir, Freundlich, Temkin, and D–R isotherm. − …”

Section: Results and Discussionmentioning

confidence: 99%

“…Δ = − G nRT (30) where n is Freundlich constant. Using the above equation, the plot of ln K d vs −1/T, ln C e vs 1/T, and ln K L vs −1/T is shown in Figure 8(A,B) and Figure 9A.…”

mentioning

confidence: 99%

“…On the other hand, the binding energy (BE) values of O 1s, Fe 3d, Al 2p, Ce 3d 5/2,3/2 , and Ni 3d 3/2 of the assembly were remarkably shifted as summarized in Table10, indicating that an alteration of the local bonding environments occurred. Likely, it is due to the specific adsorption mechanism (Figure15) of fluoride onto the surface of the assembly 30,53. XRD analysis of FACN before and after fluoride adsorbed was conducted using the X-ray diffractometer in the range of the diffraction angle 2θ = 20−90°.…”

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confidence: 99%

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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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Section: Results and Discussionmentioning

confidence: 99%

“…Δ = − G nRT (30) where n is Freundlich constant. Using the above equation, the plot of ln K d vs −1/T, ln C e vs 1/T, and ln K L vs −1/T is shown in Figure 8(A,B) and Figure 9A.…”

mentioning

confidence: 99%

mentioning

confidence: 99%

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

2018

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“…First, the distribution constant (L/g) was used; Equation (7),

defined it as the ratio between the adsorption capacity of the biomass and the concentration of adsorbate in the solution at equilibrium. The value of

to be used is obtained by plotting

vs. q e and extrapolating to zero [ 20 , 21 , 22 ]. Second, the same distribution coefficient was used, transformed into dimensionless by multiplying it by the biomass concentration [ 18 ], as in Equation (8):

which extrapolates to zero

vs. q e .…”

Section: Methodsmentioning

confidence: 99%

Ag(I) Biosorption and Green Synthesis of Silver/Silver Chloride Nanoparticles by Rhodotorula mucilaginosa 1S1

et al. 2023

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The efficiency of Rhodotorula mucilaginosa 1S1 as an Ag(I) biosorbent and at the same time its ability to biosynthesize recoverable silver nanoparticles is evaluated. Kinetic, equilibrium and thermodynamic tests are carried out for 19 °C, 27 °C and 37 °C, from which the process is adjusted to a pseudo second-order kinetics and to the Freundlich model, while optimal operational conditions are determined at 27 °C. The thermodynamic study shows positive values for enthalpy (ΔH: 133.23 kJ/mol) and entropy (ΔS: 0.4976 kJ/(mol K)), while the Gibbs free energy (ΔG) value is 12.136 kJ/mol. For a metal concentration of 459 mg/L, a maximum biosorption capacity (qm) of 137.2 mg/g at 19 °C is obtained, while for 100 mg/L concentration a qm value of 60.44 mg/g is obtained at the same temperature. The mechanisms involved in the biosorption process are studied by infrared spectroscopy, X-ray diffraction and scanning and transmission electron microscopy, while the nanoparticle synthesis is evaluated by ultraviolet–visible spectrophotometry (UV-vis) and transmission electron microscopy. The results indicate that the biomass is a good biosorbent and also has the ability to synthesize silver nanoparticles (Ag/AgCl) with sizes between 12 nm and 20 nm.

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“…15/147,437 (2014)]. While entrapment of adsorbents using alginate beads has been extensively investigated for the uptake of various metals (Wang et al 2017), few studies have focused on the uptake of phosphate from solution. Sujitha and Ravindhranath (2017) reported an exceptionally high phosphate adsorption capacity of 133.3 mg=g by calcium alginate beads doped with active carbon derived from the Achyranthes aspera plant.…”

Section: Introductionmentioning

confidence: 99%

Adsorption Using Lime-Iron Sludge–Encapsulated Calcium Alginate Beads for Phosphate Recovery with ANN- and RSM-Optimized Encapsulation

Chittoo

Sutherland

2019

J. Environ. Eng.

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Excessive discharge of phosphates in municipal and industrial effluents into water bodies continues to amplify the rate and extent of eutrophication that is impairing aquatic ecosystems throughout the world. Consequently, research into technologies to combat the problem of eutrophication continues unabated. This study aimed to develop a protocol to encapsulate dewatered lime-iron sludge in calcium alginate beads and assess and optimize its phosphate adsorption performance. Response surface methodology (RSM) and artificial neural network (ANN) were used to optimize the encapsulation process through parameter variation. RSM was superior in capturing the nonlinear behavior of the process. Numerical optimization in RSM revealed that maximum adsorption could be obtained from beads prepared using 0.25 g sodium alginate and 0.5 g lime-iron sludge in 25 mL of distilled water to produce a homogeneous mixture and added dropwise into a solution of 0.31 g CaCl 2 in 25 mL of distilled water. The accuracy of the RSM prediction was subsequently validated by laboratory experiments that revealed a residual error of 2.9% and thus highlights the applicability of the model. Batch experiments were conducted and modeled to expound the mechanisms of adsorption. Kinetic data were best simulated using the pseudo-second order model while equilibrium data followed the Langmuir isotherm at room temperature and the Sips isotherm at higher temperatures. Physisorption, hydrogen bonding, dipole interaction, and ligand exchange were the dominant attachment mechanisms while film and intraparticle diffusion were the pertinent transport mechanisms. The beads exhibited a maximum monolayer adsorption capacity of 8.3 mg=g that compared well to other phosphate-targeting adsorbents reported in the literature.

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Development of Mg–Al–La tri-metal mixed oxide entrapped in alginate for removal of fluoride from wastewater

Abstract: New biopolymer beads, composite of Mg–AL–La tri-metal oxides and alginate, were synthesized, characterized and tested for their fluoride removal efficiency from wastewater. The maximum adsorption capacity of the adsorbent was 30.9 mg g−1.

Cited by 35 publications

References 38 publications

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

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

Ag(I) Biosorption and Green Synthesis of Silver/Silver Chloride Nanoparticles by Rhodotorula mucilaginosa 1S1

Adsorption Using Lime-Iron Sludge–Encapsulated Calcium Alginate Beads for Phosphate Recovery with ANN- and RSM-Optimized Encapsulation

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