Low-cost fluoride adsorbents prepared from a renewable biowaste: Syntheses, characterization and modeling studies

Rajkumar, S.; Murugesh, S.; Sivasankar, V.; Darchen, André; Msagati, Titus A.M.; Chaabane, T.

doi:10.1016/j.arabjc.2015.06.028

Cited by 55 publications

(13 citation statements)

References 51 publications

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“…Effects of phosphate on fluoride removal were also reported by [146]. The tendency of the anions to form inner-sphere complexes was reported by [28,29,32,63,170,174,175,177,178,[180][181][182][183]. Chloride ions formed outer-sphere surface complexes and had a minor effect on fluoride adsorption; thus they are less absorbed on the absorbent surface [65].…”

Section: Effects Of Anion Cation and Organicmentioning

confidence: 79%

A Comparative Study on Removal of Hazardous Anions from Water by Adsorption: A Review

John

David

Mmereki

2018

International Journal of Chemical Engineering

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This paper presents a comparative review of arsenite (As(III)), arsenate (As(V)), and fluoride (F − ) for a better understanding of the conditions and factors during their adsorption with focus on (i) the isotherm adsorption models, (ii) effects of pH, (iii) effects of ionic strength, and (iv) effects of coexisting substances such as anions, cations, and natural organics matter. It provides an indepth analysis of various methods of arsenite (As(III)), arsenate (As(V)), and fluoride (F − ) removal by adsorption and the anions' characteristics during the adsorption process. The surface area of the adsorbents does not contribute to the adsorption capacity of these anions but rather a combination of other physical and chemical properties. The adsorption capacity for the anions depends on the combination of all the factors: pH, ionic strength, coexisting substances, pore volume and particles size, surface modification, pretreatment of the adsorbents, and so forth. Extreme higher adsorption capacity can be obtained by the modification of the adsorbents. In general, pH has a greater influence on adsorption capacity at large, since it affects the ionic strength, coexisting anions such as bicarbonate, sulfate, and silica, the surface charges of the adsorbents, and the ionic species which can be present in the solution.

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Section: Effects Of Anion Cation and Organicmentioning

confidence: 79%

A Comparative Study on Removal of Hazardous Anions from Water by Adsorption: A Review

John

David

Mmereki

2018

International Journal of Chemical Engineering

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“…Various adsorbents have been investigated and reported for the removal of excess fluoride from water in an effective manner. Some of the widely employed adsorbents are La (III)-Al (III)-activated carbon modified by chemical route [ 21 ], biomaterial functionalized cerium nanocomposite [ 22 ], Quaternized Palm Kernel Shell (QPKS) [ 23 ], bone char and activated alumina [ 24 ], bone char [ 25 ], renewable biowaste [ 26 ], MgFe 2 O 4 –chitosan–CaAl nanohybrid [ 27 ], carbon nanotube composite [ 15 ], Neem Oil-Phenolic Resin Treated Bio-sorbent [ 17 ], etc. However, many of these suffer from either time-consuming synthesis procedure, high processing costs, availability of raw materials, or short lifespan, which makes them impractical to be applied in the rift valleys that are essentially impacted by high fluoride concentration in water [ 1 ].…”

Section: Introductionmentioning

confidence: 99%

Volcanic Rock Materials for Defluoridation of Water in Fixed-Bed Column Systems

2021

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Consumption of drinking water with a high concentration of fluoride (>1.5 mg/L) causes detrimental health problems and is a challenging issue in various regions around the globe. In this study, a continuous fixed-bed column adsorption system was employed for defluoridation of water using volcanic rocks, virgin pumice (VPum) and virgin scoria (VSco), as adsorbents. The XRD, SEM, FTIR, BET, XRF, ICP-OES, and pH Point of Zero Charges (pHPZC) analysis were performed for both adsorbents to elucidate the adsorption mechanisms and the suitability for fluoride removal. The effects of particle size of adsorbents, solution pH, and flow rate on the adsorption performance of the column were assessed at room temperature, constant initial concentration, and bed depth. The maximum removal capacity of 110 mg/kg for VPum and 22 mg/kg for VSco were achieved at particle sizes of 0.075–0.425 mm and <0.075 mm, respectively, at a low solution pH (2.00) and flow rate (1.25 mL/min). The fluoride breakthrough occurred late and the treated water volume was higher at a low pH and flow rate for both adsorbents. The Thomas and Adams–Bohart models were utilized and fitted well with the experimental kinetic data and the entire breakthrough curves for both adsorbents. Overall, the results revealed that the developed column is effective in handling water containing excess fluoride. Additional testing of the adsorbents including regeneration options is, however, required to confirm that the defluoridation of groundwater employing volcanic rocks is a safe and sustainable method.

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“…13,14 Among the various techniques available, adsorption method seems to be superior because of its exibility, cost effectiveness, environmentally friendly, simple design and easy operation. 15 Different adsorbents have been reported for the removal of uoride, including activated alumina, carbonaceous materials, activated clay, rare earth oxides, titanium rich bauxite, zeolites and biomaterials. The most commonly used adsorbent for uoride removal is activated alumina (AA) but with a few drawbacks such as relatively high cost, difficulties in regeneration and disposal of the exhausted adsorbent.…”

Section: Introductionmentioning

confidence: 99%

Adsorptive, kinetics and regeneration studies of fluoride removal from water using zirconium-based metal organic frameworks

et al. 2020

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Low-cost fluoride adsorbents prepared from a renewable biowaste: Syntheses, characterization and modeling studies

Cited by 55 publications

References 51 publications

A Comparative Study on Removal of Hazardous Anions from Water by Adsorption: A Review

A Comparative Study on Removal of Hazardous Anions from Water by Adsorption: A Review

Volcanic Rock Materials for Defluoridation of Water in Fixed-Bed Column Systems

Adsorptive, kinetics and regeneration studies of fluoride removal from water using zirconium-based metal organic frameworks

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