Fluoride adsorption from aqueous solution using a protonated clinoptilolite and its modeling with artificial neural network-based equations

Saucedo-Delgado, B.G.; Río, David Alejandro De Haro-Del; Rodríguez, Luis Mario González; Reynel-Ávila, Hilda Elizabeth; Mendoza-Castillo, Didilia I.; Bonilla-Petriciolet, Adrián; Rosa, Javier Rivera De la

doi:10.1016/j.jfluchem.2017.11.002

Cited by 31 publications

(19 citation statements)

References 35 publications

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“…Further, k 2 values decreases with increasing the fluoride concentration, which confirms the higher mass transfer rate at lower concentrations of fluoride ions . A review of recent studies on fluoride adsorption suggests that most researchers have also proposed PSO model as the best kinetic model for fitting experimental data .…”

Section: Resultsmentioning

confidence: 63%

“…Most of these processes are faced with challenges such as high cost of equipment and operations as well as production of toxic sludge or other waste materials. Among these processes, the adsorption is a more promising technique for the fluoride removal . In recent years, a large number of materials such as activated alumina , activated carbon , metal oxides , clays , and zeolites have been suggested for the adsorption of fluoride from aqueous solution.…”

Section: Introductionmentioning

confidence: 99%

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Modification of Tamarix hispida Biochar by Lanthanum Chloride for Enhanced Fluoride Adsorption from Synthetic and Real Wastewater

Habibi

Rouhi

Ramavandi

2018

Env Prog and Sustain Energy

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The purpose of this research was the preparation of Tamarix hispida biochar during a pyrolysis process and then improvement its fluoride adsorption capacity by lanthanum chloride. The biochar powder was amended by lanthanum during a precipitation‐oxidation method to make biochar–lanthanum (biochar–La). Adsorbent characteristics of the fresh and fluoride loaded biochar–La were determined by using Fourier‐transform infrared spectroscopy spectrometer, Brunauer–Emmett–Teller, pH of zero point charge, energy‐dispersive X‐ray spectroscopy, and scanning electron microscopy methods. The mesoporous adsorbent had a surface area of 164.5 m2/g. Effects of some important factors such as initial fluoride concentration (20, 40, and 70 mg/L), biochar–La dose (1–10 g/L), contact time (3–100 min), solution temperature (25–50°C), and initial pH (2–10) were tested. The results showed that fluoride uptake by modified biochar is much more effective than simple one. The adsorption data well followed the Langmuir isotherm (maximum adsorption capacity = 164.23 mg/g) and second‐order kinetic model. Increasing the amount of biochar–La and fluoride concentration was led to increasing and reducing the adsorption efficiency, respectively. The biochar–La adsorbent had a good performance at sixth cycle of reuse (>50% removal). The fluoride content in a real wastewater was reduced from 23 mg/L to around 3 mg/L at conditions of biochar–La: 5 g/L, time: 50 min, and original pH: 6.8. © 2018 American Institute of Chemical Engineers Environ Prog, 38: S298–S305, 2019

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Section: Resultsmentioning

confidence: 63%

Section: Introductionmentioning

confidence: 99%

Modification of Tamarix hispida Biochar by Lanthanum Chloride for Enhanced Fluoride Adsorption from Synthetic and Real Wastewater

Habibi

Rouhi

Ramavandi

2018

Env Prog and Sustain Energy

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“…Within the range of 20-40°C, there is an exothermic reaction due to the negative enthalpy of the reaction, whereas in the range 50-70°C the enthalpy is positive, which means that the reaction is endothermic in this range. Such change could be the result of the surface complexation variations that occurs as adsorption temperature is modified [36]. It is also possible to notice the decrease in ΔG along with the increase in temperature, which indicates a decrease in the driving force of the process, which in turn results in less adsorption.…”

Section: Thermodynamic Studiesmentioning

confidence: 99%

Sorption and photocatalytic degradation of methylene blue on bentonite-ZnO-CuO nanocomposite

Szostak

Banach

2019

Journal of Molecular Liquids

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This paper presents a method for removing organic dyes by sorption and photocatalytic processes on a bentonite bed modified with ZnO-CuO nanocomposite. The effect of the initial dye concentration and temperature on the amount of dye removed from the solution was investigated. The results obtained at equilibrium state allowed us to determine the equilibrium and kinetic models and the thermodynamic parameters for the studied processes. The Langmuir isotherm is the best model for describing the equilibrium processes for both sorption and sorption with photocatalysis. In terms of kinetics, both processes are accurately described by the pseudosecond order model, which demonstrates the chemical nature of sorption. Due to the negative ΔG values calculated from the tests, it was found that the studied processes are spontaneous. It was possible to obtain a better degree of purification of the dye solution using combined sorption and photocatalysis compared to the sorption process itself.

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“…Clinoptilolite is not effective in removing anions such as fluoride from water due to its cation exchange property and its negative surface charge which causes electrostatic repulsion. However, the adsorption capacity of the clinoptilolite can be increased by modifying the surface using different multivalent cations (Gomez‐Hortigüela et al, 2013; Velazquez‐Pena et al, 2017; Saucedo‐Delgado et al, 2017). For this purpose, different studies have been carried out to determine the fluoride adsorption capacity of iron (Sun et al, 2011), aluminum (Samatya et al, 2007), lanthanum (Teutli‐Sequeira et al, 2013), calcium (Zhang et al, 2011) and zirconium (Zhou et al, 2014) modified zeolites.…”

Section: Introductionmentioning

confidence: 99%

The adsorption of fluoride from aqueous solutions by Fe, Mn, and Fe/Mn modified natural clinoptilolite and optimization using response surface methodology

Baskan

Biyikli²

2020

Water Environment Research

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Natural clinoptilolite was modified using iron, manganese, or iron-manganese for adsorption of fluoride from aqueous solutions. Natural and modified clinoptilolite samples were characterized by X-ray fluorescence spectrometry, scanning electron microscope, X-ray diffraction, and Brunauer-Emmett-Teller. For all modified clinoptilolite samples, the time required to reach equilibrium was determined as 5 hr. The effects of adsorbent dose, pH, and initial fluoride concentration for fluoride adsorption were determined using the Box-Behnken Design. Maximum fluoride removal efficiency was 80.23% at the solution pH of 11, iron-modified clinoptilolite amount of 1.08 g/50 ml and at the initial fluoride concentration of 2 mg/L. Fluoride adsorption on iron-modified clinoptilolite showed good compatibility with the Freundlich isotherm and the pseudo-second-order kinetic model. The adsorption capacity of iron-modified clinoptilolite was found to be 1.72 mg/g for the initial fluoride concentration of 50 mg/L. This study has shown that BBD is an effective and dependable method in determining the optimum conditions for fluoride adsorption. © 2020 Water Environment Federation • Practitioner points • Response surface methodology is effective in determining the optimum conditions for fluoride adsorption using modified clinoptilolite. • Fluoride adsorption on iron-modified clinoptilolite is well described Freundlich isotherm and follows pseudo-second-order kinetic model. • Fluoride removal percentage not only depends on the adsorbent dose, but also depends on the initial fluoride concentrations. • Regeneration process using acid solution is not very effective for desorption of ironmodified zeolite. • The natural clinoptilolite is an effective and economical adsorbent for adsorption of fluoride.

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Fluoride adsorption from aqueous solution using a protonated clinoptilolite and its modeling with artificial neural network-based equations

Cited by 31 publications

References 35 publications

Modification of Tamarix hispida Biochar by Lanthanum Chloride for Enhanced Fluoride Adsorption from Synthetic and Real Wastewater

Modification of Tamarix hispida Biochar by Lanthanum Chloride for Enhanced Fluoride Adsorption from Synthetic and Real Wastewater

Sorption and photocatalytic degradation of methylene blue on bentonite-ZnO-CuO nanocomposite

The adsorption of fluoride from aqueous solutions by Fe, Mn, and Fe/Mn modified natural clinoptilolite and optimization using response surface methodology

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