Removal of fluoride from industrial wastewater by using different adsorbents: A review

Wan, Kuilin; Huang, Lei; Yan, Jia; Ma, Boyan; Huang, Xuanjie; Luo, Zhixuan; Zhang, Hongguo; Xiao, Tangfu

doi:10.1016/j.scitotenv.2021.145535

Cited by 217 publications

(54 citation statements)

References 129 publications

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“…Examples of commonly used adsorbents are modied alumina, metal oxides, carbon-based materials, biomass, metal-organic frameworks, and polymer-based adsorbents. 27,28 However, these materials have several difficulties, such as complicated synthesis processes, environmental instability, secondary contamination, and prohibitive raw material costs. 3,29,30 Polypyrrole, a conducting polymer has been picked as the principal object of concern owing to its easy synthesis process, as well as its ability to easily scavenge uoride ions.…”

Section: Introductionmentioning

confidence: 99%

Application of polypyrrole-based adsorbents in the removal of fluoride: a review

Wang

Alhassan

et al. 2022

RSC Adv.

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Section: Introductionmentioning

confidence: 99%

Application of polypyrrole-based adsorbents in the removal of fluoride: a review

Wang

Alhassan

et al. 2022

RSC Adv.

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“…Recent reviews have summarized and detailed the development of various fluoride removal technologies, including membrane [ 11 ], adsorption [ 12 ], electrocoagulation [ 13 ] and coagulation-precipitation [ 14 ] techniques. Among them, the use of adsorbents seems one of the most promising methods for fluoride removal [ 10 , 15 ], because it is cost-effective and easy to implement; moreover, it can have high removal capacity and can be reused [ 10 ]. Functional metal oxides with nanostructures, such as porous nano-MgO [ 16 – 18 ] and La@MgAl nanocomposites [ 19 ], show superior fluoride adsorption performance.…”

Section: Introductionmentioning

confidence: 99%

Removal of fluoride ions from aqueous solution by metaettringite

Iizuka

Yamasaki

2022

PLoS ONE

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Fluoride contamination is a major problem in wastewater treatment. Metaettringite (which has previously shown enhanced anion adsorption) was investigated as a possible adsorbent to remove fluoride from low-concentration solution (25 mg-F/L). The fluoride removal properties of ettringite and metaettringite were first compared at pH 10, and metaettringite was found to be more effective. The dominant reaction mechanism for fluoride adsorption in metaettringite was found to be recrystallization of metaettringite by rehydration; this was accompanied by precipitation of calcium fluoride. The adsorption kinetics followed the pseudo-second order model. Metaettringite was also able to remove fluoride effectively in low pH environment (i.e., at pH 3.5). The influence of coexistence of sulfate ions in solution on the fluoride removal performance was investigated, and a small decrease in performance was noted. The residual fluoride concentrations obtained with higher doses of metaettringite were lower than those specified by the Japanese effluent standard (non-coastal areas: 8 mg-F/L; coastal areas: 15 mg-F/L). The fluoride removal capacity of metaettringite was compared with those of other solid materials. The observed maximum capacity was 174.7 mg-F/g-metaettringite. In the case of high fluoride concentration solution, the main removal mechanism will be changed to calcium fluoride precipitation. In general, metaettringite is regarded as promising material for fluoride removal in wastewater treatment.

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“…Fluorine is one of the main contaminants in ground water and industrial effluents (Kong et al, 2020;Wan et al, 2021). Long-term intake of high-fluoride level water may lead to dental fluorosis, bone fluorosis and even neurological damage (Díaz-Flores et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Efficient Coagulation Removal of Fluoride Using Lanthanum Salts: Distribution and Chemical Behavior of Fluorine

et al. 2022

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La-loaded absorbents have been widely reported for fluoride removal due to the strong affinity of La3+ towards fluoride ion. Herein, chemical removal of fluoride from flue gas scrubbing wastewater using lanthanum salt is investigated. The retaining free F− concentration, phase composition and morphology of filtration residues, and the distribution of fluorine have been investigated using ion-selective electrode, analytical balance, scanning electron microscopy, and X-ray diffractor. The results show that at La/F molar ratio ≥1:3.05, the majority of fluorine exists as LaFx3−x complexes, leading to the failure of fluoride removal. At 1:3.20 ≤ La/F molar ratio ≤1:3.10, the formation of LaF3 is facilitated. However, co-existing LaFx3−x tends to absorb on the surface of LaF3 particles, leading to the formation of colloidal solution with large numbers of LaF3·LaFx3−x suspended solids. At an optimized La/F molar ratio of 1:3.10, a fluoride removal of 97.86% is obtained with retaining fluorine concentration of 6.42 mg L−1. Considering the existing of positively charged LaFx3−x and LaF3·LaFx3−x, coagulation removal of fluoride is proposed and investigated using lanthanum salts and negatively charged SiO2·nH2O colloidal particles, which is in-situ provided via Na2SiO3 hydrolysis at pH near 5.5. At a La/F molar ratio of 1:3.00 and Na2SiO3 dose of 0.50 g L−1, a fluoride removal of 99.25% is obtained with retaining fluorine concentration of 2.24 mg L−1. When Na2SiO3 dose increases to 1.00 g L−1, the retaining fluorine concentration could be further reduced to 0.80 mg L−1.

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Removal of fluoride from industrial wastewater by using different adsorbents: A review

Cited by 217 publications

References 129 publications

Application of polypyrrole-based adsorbents in the removal of fluoride: a review

Application of polypyrrole-based adsorbents in the removal of fluoride: a review

Removal of fluoride ions from aqueous solution by metaettringite

Efficient Coagulation Removal of Fluoride Using Lanthanum Salts: Distribution and Chemical Behavior of Fluorine

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