State-of-the-art of research progress on adsorptive removal of fluoride-contaminated water using biochar-based materials: Practical feasibility through reusability and column transport studies

Kumar, Ravi; Sharma, Prabhakar; Yang, Wen; Shang, Jianying; Bhattacharya, Prosun; Vithanage, Meththika; Maity, Jyoti Prakash

doi:10.1016/j.envres.2022.114043

Cited by 37 publications

(3 citation statements)

References 341 publications

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“…Using a 0.45-µm PES filter, the suspension was filtered after sampling. The effect of pyrolysis temperature (300, 400, 500, and 600 • C), dosage (0.01, 0.02, 0.05, 0.1, and 0.2 g), and solution pH (3)(4)(5)(6)(7)(8)(9)(10)(11)(12) on the adsorption performance of F − was examined. Detailed experimental conditions were described in the illustrations.…”

Section: Adsorptive Experimentsmentioning

confidence: 99%

“…According to the WHO, the permissible limit for fluoride in drinking water is under 1.5 mg/L [4]. In China, India, Mexico, and some African countries such as Ethiopia, Uganda, and Kenya, there are high levels of fluoride in the groundwater and surface water [5]. The recorded fluoride concentration in Lake Nakuru (Kenya) reached an alarming 2800 mg/L [6].…”

Section: Introductionmentioning

confidence: 99%

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Phosphogypsum-Modified Vinasse Shell Biochar as a Novel Low-Cost Material for High-Efficiency Fluoride Removal

Liu,

Zhang,

Mou

2023

Molecules

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In this study, vinasse shell biochar (VS) was easily modified with phosphogypsum to produce a low-cost and novel adsorbent (MVS) with excellent fluoride adsorption performance. The physicochemical features of the fabricated materials were studied in detail using SEM, EDS, BET, XRD, FTIR, and XPS techniques. The adsorption experiments demonstrated that the adsorption capacity of fluoride by MVS was greatly enhanced compared with VS, and the adsorption capacity increased with the pyrolysis temperature, dosage, and contact time. In comparison to chloride and nitrate ions, sulfate ions significantly affected adsorption capacity. The fluoride adsorption capacity increased first and then decreased with increasing pH in the range of 3–12. The fluoride adsorption could be perfectly fitted to the pseudo-second-order model. Adsorption isotherms matched Freundlich and Sips isotherm models well, giving 290.9 mg/g as the maximum adsorption capacity. Additionally, a thermodynamic analysis was indicative of spontaneous and endothermic processes. Based on characterization and experiment results, the plausible mechanism of fluoride adsorption onto MVS was proposed, mainly including electrostatic interactions, ion exchange, precipitation, and hydrogen bonds. This study showed that MVS could be used for the highly efficient removal of fluoride and was compatible with practical applications.

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Section: Adsorptive Experimentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Phosphogypsum-Modified Vinasse Shell Biochar as a Novel Low-Cost Material for High-Efficiency Fluoride Removal

Liu,

Zhang,

Mou

2023

Molecules

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“…Fluoride contamination in drinking water poses a serious threat to public health, and excessive intake of fluoride results in dental or bone diseases. − About 200 million people worldwide rely on water sources with excessive fluoride ions (the World Health Organization limits the concentration of fluoride in drinking water to 1.5 mg/L). − Fluoride ions originate from the dissolution of minerals or the discharge of human industrial activities. ,− Fertilizer production (∼1700 mg/L), optoelectronic (∼2000 mg/L), aluminum electroplating (∼7000 mg/L), semiconductor manufacturing (∼1500 mg/L), photovoltaic power generation (∼2500 mg/L), and other industries produce a large amount of high-fluorine wastewater, and the discharge of these wastewater aggravates the current situation of fluorine contamination. − The concentration of fluoride ion in most of the high fluoride wastewater is at 500–2000 mg/L. Meanwhile, fluorite, as a mineral that can extract a large amount of fluorine, is the main source of fluorine in the modern chemical industry.…”

Section: Introductionmentioning

confidence: 99%

Sulfate Doping Promotes Agglomeration of Calcium Fluoride Crystals

Wang,

Zhang,

et al. 2024

Environ. Sci. Technol.

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Calcium salt precipitation is an effective solution to wastewater fluoride pollution. The purity and precipitation efficiency of calcium fluoride is critical for its removal and recovery. This study aimed to reveal the role of coexisting sulfates in the precipitation of calcium fluoride. A low sulfate concentration promoted calcium fluoride precipitation. The size of calcium fluoride-aggregated particle clusters increased from 750 to 2000 nm when the molar ratio of sulfate to fluoride was increased from 0 to 3:100. Sulfate doped in the calcium fluoride crystals neutralized the positive charge of the calcium fluoride. Online atomic force microscopy measurements showed that sulfate reduced the repulsive force between calcium fluoride crystals and increased the adhesion force from 1.62 to 2.46 nN, promoting the agglomeration of calcium fluoride crystals. Sulfate improved the precipitation efficiency of calcium fluoride by promoting agglomeration; however, the purity of calcium fluoride was reduced by doping. Sulfate reduced the induction time of calcium fluoride crystallization and improved the nucleation rate of calcium fluoride. Sulfate should be retained to improve the precipitation of calcium fluoride and to avoid its loss from the effluents. However, it is necessary to separate sulfate from fluoride to obtain highpurity calcium fluoride. Therefore, sulfate concentration regulation in high-fluoride wastewater is key to achieving the efficient removal and recovery of fluoride ions.

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Repurposing Discarded Electric Geyser Scaling Waste for Biochar Modification and Insights into Removal of Nitrate and Fluoride from Drinking Water

Verma,

Sharma

2024

Advanced Sustainable Systems

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This research explores the potential of use of waste scaling deposition from electric geysers (EGWS) to synthesize calcium oxide and address fluoride and nitrate contamination in water. The study adopts a circular economy framework by utilizing the synthesized calcium oxide to modify corn cob biochar through ball‐milling, creating a cost‐effective and environmentally sustainable adsorbent. The adsorbent is characterized and pHpzc analysis of CaO@CBC indicates sustained high adsorption capacities for nitrate and fluoride across a broad pH range (2–11). The adsorption kinetics follow a pseudo‐second‐order model, indicating chemisorption mechanisms. The Langmuir isotherm model fits well, showing high maximum adsorption capacities of 18.36 mg g−1 for fluoride and 19.27 mg g−1 for nitrate, surpassing those reported for other materials. Thermodynamic studies indicate that the uptake reactions of fluoride and nitrate are spontaneous and exothermic. Results from pH studies, XPS analysis, and FTIR offer insights into the adsorption mechanism by suggesting electrostatic attraction, inner‐sphere complexation, and ion exchange. The research establishes the efficacy of CaO‐impregnated biochar derived from electric geyser waste in removing fluoride and nitrate, offering a sustainable solution for water pollution. This work breakthroughs the development of efficient and eco‐friendly adsorbents for water treatment, aligning with the principles of a circular economy.

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State-of-the-art of research progress on adsorptive removal of fluoride-contaminated water using biochar-based materials: Practical feasibility through reusability and column transport studies

Cited by 37 publications

References 341 publications

Phosphogypsum-Modified Vinasse Shell Biochar as a Novel Low-Cost Material for High-Efficiency Fluoride Removal

Phosphogypsum-Modified Vinasse Shell Biochar as a Novel Low-Cost Material for High-Efficiency Fluoride Removal

Sulfate Doping Promotes Agglomeration of Calcium Fluoride Crystals

Repurposing Discarded Electric Geyser Scaling Waste for Biochar Modification and Insights into Removal of Nitrate and Fluoride from Drinking Water

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