Fluoride ion removal from aqueous solution, groundwater, and seawater by granular and powdered Conocarpus erectus biochar

Papari, Fatemeh; Najafabadi, Parham Rouhi; Ramavandi, Bahman

doi:10.5004/dwt.2017.20271

Cited by 34 publications

(24 citation statements)

References 50 publications

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“…Other researchers have also suggested that this phenomenon is due to an increase in the energy adsorbed by the adsorbate ions. A review of studies suggests that the findings of this work are consistent with the results of some other studies [1,22]. In this regard, the difference between studies may also be due to the difference in adsorbent type and test conditions.…”

Section: Effect Of Temperaturesupporting

confidence: 88%

“…Other researchers also confirmed the superiority of the Langmuir model in the adsorption process [25,26]. The maximum adsorption capacity (Q m = 164.23 mg/g) in Langmuir model shows more satisfactory results than other studied adsorbents like Ce-Fe bimetal oxides [27], magnetic core-shell Ce-Ti@Fe 3 O 4 and Ce-Ti oxide nanoparticles [28], granular and powdered Conocarpus erectus biochar [1], Mg-Ce-La adsorbent [29], and magnetic and non-magnetic corn stover biochars [20]. D-R isotherm is a model that is generally applied to use a Gaussian distribution of pollutant to a heterogeneous surface.…”

Section: Adsorption Isothermsmentioning

confidence: 60%

“…Thus, it is suggested that the adsorption of fluoride onto biochar-La is affected by the concentration of adsorbate and adsorbent material. Further, k 2 values decreases with increasing the fluoride concentration, which confirms the higher mass transfer rate at lower concentrations of fluoride ions [1]. 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 [1,5,13].…”

Section: Adsorption Isothermsmentioning

confidence: 70%

“…The BET surface area of the prepared biochar-La was much better than the biochar of peanut shell [18], Green Texan Organic Farms LLC [19], and corn stover [20] and lower than some others like Wakefield Agricultural Carbon LLC. [19], dew melon peel [12], and Conocarpus erectus [1]. The values of C constant of BET of fresh and used biochar-La were 47,753 and 1266.5, respectively, which affirming the appropriateness of the biochar-La for the adsorption of inorganic adsorbates such as fluoride.…”

Section: Surface Studymentioning

confidence: 71%

“…Also, at pH less than pHzpc, the surface of the biochar – La powder takes on a positive charge and it adsorbs more fluoride ions electrostatically. Another important point is that, under very acidic conditions (pH 2 and 4), the adsorption of fluoride has decreased slightly due to the formation of hydrofluoric acid . Studies by Saucedo‐Delgado et al .…”

Section: Resultsmentioning

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: Effect Of Temperaturesupporting

confidence: 88%

Section: Adsorption Isothermsmentioning

confidence: 60%

Section: Adsorption Isothermsmentioning

confidence: 70%

Section: Surface Studymentioning

confidence: 71%

Section: Resultsmentioning

confidence: 99%

See 3 more Smart Citations

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

Self Cite

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Effective Parameters, Equilibrium, and Kinetics of Fluoride Adsorption on Prosopis cineraria and Syzygium cumini Leaves

Keshtkar

Dobaradaran

Keshmiri

et al. 2019

Env Prog and Sustain Energy

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This study was designed to present a facile and effective biosorbent from Prosopis cineraria and Syzygium cumini leave (PCL and SCL) for fluoride removal. The test was done in batch mode and the effect of contact time (5, 25, 60, 90, and 120 min), initial fluoride concentration level (3, 5, 8, and 12 mg/L), and biosorbent dose (1, 3, 5, 10, and 25 g/L) on the biosorption process were examined. The optimum conditions for the maximum fluoride removal were occurred at 1 g/L biosorbent dose and contact time of 120 (for PCL) and 90 min (for SCL). The results suggested that the pseudo‐second‐order and Langmuir isotherm models described the experimental data well. According to the Langmuir model, the maximum adsorption capacity of fluoride for PCL and SCL was attained 11.52 and 7.4 mg/g, respectively. Based on Boyd and intra‐diffusion models, the biosorption of fluoride onto PCL and SCL was mainly controlled by film‐diffusion. The study revealed the potential use of PCL and SCL as two new effective biosorbents for the removal of fluoride from aqueous solution. © 2019 American Institute of Chemical Engineers Environ Prog, 38: S429–S440, 2019

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Recovery of fluoride from water through adsorption using orange-waste gel, followed by desorption using saturated lime water

Paudyal

Ohto

Kawakita

et al. 2020

J Mater Cycles Waste Manag

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Fluoride ion removal from aqueous solution, groundwater, and seawater by granular and powdered Conocarpus erectus biochar

Cited by 34 publications

References 50 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

Effective Parameters, Equilibrium, and Kinetics of Fluoride Adsorption on Prosopis cineraria and Syzygium cumini Leaves

Recovery of fluoride from water through adsorption using orange-waste gel, followed by desorption using saturated lime water

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