Experimental evaluation of sorptive removal of fluoride from drinking water using natural and brewery waste diatomite

Yitbarek, Menberu; Abdeta, K.; Beyene, Abebe; Astatkie, Higemengist; Dadi, Dessalegn; Desalew, G.; Bruggen, Bart Van der

doi:10.1016/j.psep.2019.05.052

Cited by 29 publications

(13 citation statements)

References 59 publications

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“…Thus, under acidic conditions, the surface usually retains excess protons, resulting in a total positive charge ( Cai et al, 2017 ). More H + on the adsorbent’s surface leads to the electrostatic attraction between its positively charged surface and F ‐ under acidic conditions, and the exchange of hydroxyl groups with F ‐ is considered mainly responsible for the removal of fluoride at the interface with the adsorbent water ( Yitbarek et al, 2019 ). At this time, the adsorption of F ‐ is favored.…”

Section: Resultsmentioning

confidence: 99%

“…Nevertheless, their low cost and efficiency are seen as their chief advantages. Low-cost and widely used adsorbents include diatomite ( Yitbarek et al, 2019 ), bentonite ( Ortiz-Ramos et al, 2022 ), and biochar ( Mei et al, 2020 ), all of which have great application value for fluoride’s removal from water. Diatomite is a light-colored, soft, and lightweight sedimentary rock composed of amorphous silica (SiO 2 -nH 2 O), mainly derived from aquatic diatom plant skeletons.…”

Section: Introductionmentioning

confidence: 99%

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Adsorption Characteristics and Charge Transfer Kinetics of Fluoride in Water by Different Adsorbents

et al. 2022

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Water containing high concentrations of fluoride is widely distributed and seriously harmful, largely because long-term exposure to fluoride exceeding the recommended level will lead to fluorosis of teeth and bones. Therefore, it is imperative to develop cost-effective and environmentally friendly adsorbents to remove fluoride from polluted water sources. In this study, diatomite (DA), calcium bentonite (CB), bamboo charcoal (BC), and rice husk biochar (RHB) were tested as adsorbents to adsorb fluoride (F‐) from water, and this process was characterized by scanning electron microscopy (FEI-SEM), X-ray diffraction (XRD), and Fourier-transform infrared spectroscopy (FT-IR). The effects of pH, dosage, and the initial mass concentration of each treatment solution upon adsorption of F‐ were determined. Kinetic and thermodynamic models were applied to reveal the mechanism of defluoridation, and an orthogonal experiment was designed to obtain the optimal combination of conditions. The results show that the surfaces of CB, BC, and RHB have an irregular pore structure and rough surface, whereas DA has a rich pore structure, clear pores, large specific surface area, and high silica content. With regard to the adsorption process for F‐, DA has an adsorption complex electron interaction; that of CB, BC, and RHB occur mainly via ion exchange with positive and negative charges; and CB on F‐ relies on chemical electron bonding adsorption. The maximum adsorption capacity of DA can reach 32.20 mg/g. When the mass concentration of fluoride is 100 mg/L, the pH value is 6.0 and the dosage is 4.0 g/L; the adsorption rate of F‐ by DA can reach 91.8%. Therefore, we conclude that DA soil could be used as an efficient, inexpensive, and environmentally friendly adsorbent for fluoride removal, perhaps providing an empirical basis for improving the treatment of fluorine-containing water in the future.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Adsorption Characteristics and Charge Transfer Kinetics of Fluoride in Water by Different Adsorbents

et al. 2022

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“…Then, the percentage of fluoride removal efficiency and the adsorption capacity of fluoride adsorbed per unit mass of the adsorbent at any time were determined using Eqs. ( 1) and ( 2), respectively [15].…”

Section: Batch Adsorption Experimentsmentioning

confidence: 99%

Adsorption of Fluoride from Aqueous Solution using Eggshell Pretreated with Plasma Technology

Khiewwijit

Chainetr²,

Thiangchanta³

et al. 2023

Trends Sci

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Fluoride is a toxic substance that can cause adverse effects on human health such as dental and skeletal fluorosis. Therefore, the objective of this study was to investigate the adsorption potential of fluoride from aqueous solution using eggshell pretreated with plasma technology and compare to untreated eggshell. The batch adsorption experiments of fluoride from aqueous solution using pretreated eggshell and untreated eggshell were carried out to compare their performances on fluoride removal efficiency, adsorption capacity and isotherm. The effects of adsorption factors of contact time (5 - 360 min), adsorbent dosage (10 - 35 g/L) and particle size of adsorbent (mesh sieve no.12 - 20 or 0.85 - 1.70 mm sieve opening) were studied. The results showed that with the initial fluoride concentration of 10 mg/L, the optimum condition for the adsorption of fluoride from aqueous solution was obtained with pretreated eggshell at contact time of 180 min, adsorbent dosage of 25 g/L and adsorbent size of Sieve no.16 (≤1.18 mm in diameter). With this optimum condition, the maximum fluoride removal efficiency increased from 59.88 % with untreated eggshell to 90.34 %, which was due to an increase in adsorption sites after surface modification process of eggshell. Moreover, the results clearly showed that adsorption isotherm was fitted by Langmuir model, which indicate a monolayered adsorption. The maximum adsorption capacity was 0.341 mg/g for pretreated eggshell, while this was 0.202 mg/g for untreated eggshell. This study showed that eggshell pretreated with plasma technology has potential for the application of the adsorption of fluoride from aqueous solution in the future and needs further investigation on the continuous adsorption column. HIGHLIGHTS Eggshell pretreated with plasma technology (EPPT) was applied for fluoride removal Effects of contact time, adsorbent dosage and size were examined by batch method Maximum fluoride (F) removal efficiency was 90.34 % with EPPT at optimum condition F adsorption on EPPT fitted Langmuir isotherm with maximum capacity of 0.341 mg/g GRAPHICAL ABSTRACT

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“…Currently, commonly used fluoride removal technologies include adsorption, 17 precipitation, 18 membrane treatment, 19 ion exchange, 20 nano‐filtration, 21 electrocoagulation, 22 and membrane separation. The adsorption method has low price and good fluorine removal performance 23 …”

Section: Introductionmentioning

confidence: 99%

Study on the properties of bauxite modified by acid leaching and calcination for improving fluorine removal

Liu

Zhong

Zhu

et al. 2022

Asia-Pacific J Chem Eng

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In order to improve the fluorine removal performance of bauxite, the effects of different calcination temperatures and several acids (HCl, H 2 SO 4 , H 2 C 2 O 4 ) on the fluorine removal performance of bauxite were investigated. It was found that the calcination temperature of 500 C and the modification of H 2 SO 4 had the best fluorine removal performance. Under the same experimental conditions, the fluoride removal rate of the modified bauxite could reach 99.54%, which was much higher than that of unmodified bauxite (52.69%). The adsorbent was characterized by XRD, FTIR, BET, TG/DSC, and XRF. The influence of the addition amount of adsorbent, initial concentration of fluorine, adsorption time, and temperature on fluorine removal performance was studied. The adsorption process reached equilibrium in 32 min, and the inhibition order of coexisting anions was H 2 PO 4 À < HCO 3 À < CO 3 2À < Cl À . The pseudo-secondorder kinetic model was more suitable for the fluoride removal process of modified bauxite. Thermal regeneration had better regeneration performance than alkali leaching regeneration.

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Experimental evaluation of sorptive removal of fluoride from drinking water using natural and brewery waste diatomite

Cited by 29 publications

References 59 publications

Adsorption Characteristics and Charge Transfer Kinetics of Fluoride in Water by Different Adsorbents

Adsorption Characteristics and Charge Transfer Kinetics of Fluoride in Water by Different Adsorbents

Adsorption of Fluoride from Aqueous Solution using Eggshell Pretreated with Plasma Technology

Study on the properties of bauxite modified by acid leaching and calcination for improving fluorine removal

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