Recent advances in metal–organic framework-based materials for removal of fluoride in water: Performance, mechanism, and potential practical application

Tang, Xiaofeng; Zhou, Chengyun; Wu, Xue-Bing; Liang, Yuntao; Zeng, Yuxi; Zhao, Xiaoying; Xiong, Weiping; Cheng, Min; Wang, Ziwei

doi:10.1016/j.cej.2022.137299

Cited by 70 publications

(25 citation statements)

References 127 publications

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“…Using batch adsorption tests, Kagne et al 363 examined the potential of hydrated cement to remove uoride from aqueous solution at different intervals. They discovered that the hydrated cement removed considerable amounts of uoride in a broad pH range (3)(4)(5)(6)(7)(8)(9)(10). The linear transformed Freundlich and Langmuir isotherms were successfully tted by the experimental data collected from the batch adsorption studies.…”

Section: Fluoride Mitigation Knowledgementioning

confidence: 99%

“…3 Drinking water is measured as the critical uoride carrier in the human body, where the digestive system absorbs 90% of the uoride intake through water. 4 Some rocks such as uorite, biotite, topaz, uorapatite, cryolite hornblende, and muscovite contain uoride-rich minerals, which release uoride present in them aer interacting with water. 5 The uoride ion concentration available in groundwater is dependent on various factors, which include the physio-chemical condition of the aquifer from where the groundwater is extracted, 6 intensity of rock weathering, depth of water in the aquifer, 7 acidity and porosity of soil and rocks, interaction between different chemical elements, temperature in the surrounding region, 8 mineral composition of rocks, and the geochemistry of the groundwater.…”

Section: Introductionmentioning

confidence: 99%

“…3 Drinking water is measured as the critical fluoride carrier in the human body, where the digestive system absorbs 90% of the fluoride intake through water. 4…”

Section: Introductionmentioning

confidence: 99%

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Fluoride contamination, consequences and removal techniques in water: a review

Ahmad

Singh

Arfin

et al. 2022

Environ. Sci.: Adv.

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Section: Fluoride Mitigation Knowledgementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Fluoride contamination, consequences and removal techniques in water: a review

Ahmad

Singh

Arfin

et al. 2022

Environ. Sci.: Adv.

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“…Fluoride contamination in groundwater threatens hundreds of millions of people worldwide, most among which live in arid or semi-arid areas. − The World Health Organization (WHO) regulates the maximum allowable contaminant level (MCL) of fluoride in drinking water as 1.5 mg/L, and some countries, such as China and India, have set an even more strict MCL value of 1.0 mg/L. , A variety of techniques including precipitation–coagulation, ion exchange, adsorption, membrane separation, and electrodialysis have been developed for water defluoridation. Among them, adsorption is extremely promising owing to the merits of high efficiency, easy operation, and environmental friendliness. , …”

Section: Introductionmentioning

confidence: 99%

“…Nowadays, there have been extensive reports about the design, preparation, mechanism, and application of various adsorbents for fluoride removal. − Activated alumina (AA), , hydroxyapatite (HAP), , and their derivatives are frequently adopted for groundwater defluoridation. However, AA is unstable under acidic or alkaline conditions, and thereby aluminum-containing salts like Al 2 (SO 4 ) 3 and NaAlO 2 rather than alkali are often used to regenerate the exhausted adsorbents .…”

Section: Introductionmentioning

confidence: 99%

Pilot-Scale Field Demonstration of Environmental Nanotechnology for Groundwater Defluoridation

Deng

Cheng

et al. 2022

ACS EST Eng.

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Fluoride contamination in groundwater is a global issue. Nanoscale oxides of Zr(IV), Al(III), and Ti(IV) can form the inner-sphere complex with fluoride through ligand exchange, offering a new chance for efficient groundwater purification. However, pilot-scale field demonstration of nanotechnology in groundwater defluoridation is very rare. Herein, we conducted a 150-day field defluoridation study using the nanocomposite HZO@D201, which was prepared by encapsulating nano-hydrated zirconium oxide (HZO) inside the strongly basic anion exchanger D201. The HZO@D201 beads were packed in five-stage series columns (40 L for each column), and the groundwater was pumped through the columns sequentially. The effective treatment amount for the single column ([F–] < 1.0 mg/L) exceeded ∼3000 bed volume (BV). The exhausted HZO@D201 was fully refreshed through ex situ treatment with NaOH–NaCl solution for repeated use without significant loss in defluoridation reactivity. Owing to the specific interaction with HZO, the fluoride concentration could be steadily reduced below 1.0 mg/L throughout the 150-day field demonstration, while the common anions coexisting in groundwater (K+, Na+, Ca2+, Mg2+, SO4 2–, Cl–, etc.) remained almost unchanged. The operational cost for deep defluoridation was estimated as 0.574 RMB per ton of groundwater, much less than that of the widely studied reverse osmosis. TEM, XPS, and Fourier transform infrared (FTIR) analysis indicated that negligible change occurred in the structure and chemical composition of HZO@D201 after the long-term field assay. This study may inspire more attempts at the pilot scale and engineering demonstration of nano-enabled water treatment techniques.

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Single‐Atom Catalysts Originated from Metal–Organic Frameworks for Sulfate Radical‐Based Advanced Oxidation Processes: Critical Insights into Mechanisms

Chen,

Kang,

Cheng

et al. 2023

Adv Funct Materials

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The widely discussed single‐atom catalysts (SACs) are regarded as a kind of attractive material for sulfate radical‐based advanced oxidation processes (SR‐AOPs) owing to their maximum atomic utilization efficiency and outstanding stability. Currently, metal–organic frameworks (MOFs) have appeared as prospective precursors for building SACs due to extensive chelating sites, functional adjustability, and structural tunability. However, there are few critical and systematic reviews about the application of MOF‐derived SACs in SR‐AOPs, especially in‐depth analysis of the mechanisms. Therefore, this review seeks to offer a thorough summary of the development of MOF‐derived SACs in SR‐AOPs. First, the unique advantages of MOFs as derivative precursors for SACs are discussed thoroughly. Afterward, the current synthesis strategies are elaborated categorically to unveil the formation process of single atoms and their coordination environments. Notably, the roles of different reaction sites including the generation of reactive species and mediating electron transfer are further analyzed to explain mechanisms comprehensively. Thereafter, the characterization techniques and theoretical calculations for mechanisms studies are also highlighted. Eventually, critical insights into present challenges and future developments are proposed, which are expected to enhance the catalytic efficiency of MOF‐derived SACs in SR‐AOPs.

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Recent advances in metal–organic framework-based materials for removal of fluoride in water: Performance, mechanism, and potential practical application

Cited by 70 publications

References 127 publications

Fluoride contamination, consequences and removal techniques in water: a review

Fluoride contamination, consequences and removal techniques in water: a review

Pilot-Scale Field Demonstration of Environmental Nanotechnology for Groundwater Defluoridation

Single‐Atom Catalysts Originated from Metal–Organic Frameworks for Sulfate Radical‐Based Advanced Oxidation Processes: Critical Insights into Mechanisms

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