Physico-chemical characterization of metal-doped bone chars and their adsorption behavior for water defluoridation

Rojas-Mayorga, Cintia Karina; Bonilla-Petriciolet, Adrián; Silvestre-Albero, Joaquín; Aguayo‐Villarreal, Ismael Alejandro; Mendoza-Castillo, Didilia I.

doi:10.1016/j.apsusc.2015.07.163

Cited by 65 publications

(22 citation statements)

References 72 publications

(76 reference statements)

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“…Bone char (BC) is generally considered the most efficient and affordable material for F´removal in decentralized safe drinking water production at present [25,[56][57][58][59]. The four main reasons for this are: (i) BC is relatively inexpensive; (ii) BC is made from locally abundantly available spent bone; (iii) BC can be manufactured in sufficient amounts and quality for local needs; and (iv) BC can be recycled via a simple thermal treatment process at 200˝C.…”

Section: Bone Char-based Filters For F´removalmentioning

confidence: 99%

“…BC predominantly consists of hydoxyapatite [Ca 10 (PO 4 ) 6 (OH) 2 ] [2, [59][60][61]. BC therefore retains fluoride by chemisorption and ion exchange between dissolved F´ions and PO 4 3´.…”

Section: Bone Char-based Filters For F´removalmentioning

confidence: 99%

“…Electrostatic attraction of dissolved F´is also known to occur in parallel with F´adsorbed via physisorption. The dominating mechanism of fluoride removal has therefore not been fully elucidated [59,62,63]; however, it is certain that the kinetics of hydoxyapatite dissolution limit the extent of ion exchange. BC has been used as a versatile adsorbent for a wide variety of other pollutants, including arsenate, dyes and heavy metals [59].…”

Section: Bone Char-based Filters For F´removalmentioning

confidence: 99%

“…The dominating mechanism of fluoride removal has therefore not been fully elucidated [59,62,63]; however, it is certain that the kinetics of hydoxyapatite dissolution limit the extent of ion exchange. BC has been used as a versatile adsorbent for a wide variety of other pollutants, including arsenate, dyes and heavy metals [59]. Therefore, BC has the potential to be used universally for decentralized safe drinking water provision in chemical-free systems.…”

Section: Bone Char-based Filters For F´removalmentioning

confidence: 99%

“…However, some attempts to use locally produced BC for aqueous F´removal have not been successful [8]. Two major reasons for this are: (i) a societal aversion exists for the handling of fresh bone; and (ii) BC-filtered water produces an unpleasant taste [11,59]. Accordingly, alternatives to BC are still sought.…”

Section: Bone Char-based Filters For F´removalmentioning

confidence: 99%

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Technologies for Decentralized Fluoride Removal: Testing Metallic Iron-based Filters

Ndé-Tchoupé

Crane

Mwakabona

et al. 2015

Water

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Since the realization in the 1930s that elevated fluoride concentrations in drinking water can have detrimental effects on human health, new methods have been progressively developed in order to reduce fluoride to acceptable levels. In the developing world the necessity for filtration media that are both low-cost and sourced from locally available materials has resulted in the widespread use of bone char. Since the early 1990s metallic iron (Fe 0 ) has received widespread use as both an adsorbent and a reducing agent for the removal of a wide range of contaminant species from water. The ion-selectivity of Fe 0 is dictated by the positively charged surface of iron (hydr)oxides at circumneutral pH. This suggests that Fe 0 could potentially be applied as suitable filter media for the negatively charged fluoride ion. This communication seeks to demonstrate from a theoretical basis and using empirical data from the literature the suitability of Fe 0 filters for fluoride removal. The work concludes that Fe 0 -bearing materials, such as steel wool, hold good promise as low-cost, readily available and highly effective decentralized fluoride treatment materials.

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Section: Bone Char-based Filters For F´removalmentioning

confidence: 99%

Section: Bone Char-based Filters For F´removalmentioning

confidence: 99%

Section: Bone Char-based Filters For F´removalmentioning

confidence: 99%

Section: Bone Char-based Filters For F´removalmentioning

confidence: 99%

Section: Bone Char-based Filters For F´removalmentioning

confidence: 99%

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Technologies for Decentralized Fluoride Removal: Testing Metallic Iron-based Filters

Ndé-Tchoupé

Crane

Mwakabona

et al. 2015

Water

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Chromium(VI) removal by bone char–ZnO composite: Parameters optimization by response surface methodology and modeling

Ranjbar

Hashemi

Ramavandi

et al. 2018

Env Prog and Sustain Energy

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This study presents the efficiency of bone char‐ –ZnO for eliminating chromium(VI) from aqueous solutions. The bone char‐ –ZnO composite was provided using sol‐–gel method. The elemental, morphology, surface analysis of bone char‐ –ZnO were fully studied. The prepared composite was mostly composed of Ca5(PO4)3OH and had a specific surface area of 28.09 m2/g. Results indicated that central composite design (CCD) has a desirable ability (R2 > 0.87) to predict chromium(VI) removal by bone char‐ –ZnO. Furthermore, the results suggest that the removal efficiency increased with the elevation of adsorbent dose, shaking rate, temperature, and contact time. Isotherm and kinetics investigation indicated that chromium adsorption process follows Langmuir model (R2 > 0.97 and Qm= 84.03 mg/g) and second‐ order kinetic model (R2 > 0.999). The values of ΔH° and ΔS° of the chromium adsorption reaction by bone char‐ –ZnO were obtained as 580 kJ/mol and 5.5 kJ/mol K, respectively, suggesting spontaneity and endothermicity of the reaction. Desorption study was also performed by two desorbent agents of distilled water and nitric acid. Overall, it can be concluded that the bone char‐ –ZnO composite is an efficient and potential adsorbent to be used in water and wastewater treatment plants. © 2018 American Institute of Chemical Engineers Environ Prog, 37: 1684–1695, 2018

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Environmental exposure of arsenic and fluoride and their combined toxicity: A recent update

Mondal

Chattopadhyay

2019

J of Applied Toxicology

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Environmental exposure to arsenic (As) and fluoride (F) in the recent year has been increased because of excessive use of naturally contaminated ground water.Surface water is also regularly contaminated with these elements in various industrial areas. Arsenicosis and fluorosis upon individual exposure of As and F are reported in many studies. A syndrome of endemic As poisoning and fluorosis occurs during concurrent exposure of As and F. Previous reports showed synergistic, antagonistic and independent effects of these two compounds, although few recent reports also revealed antagonistic effects after co-exposure. Interaction during intestinal absorption and influence of F on As metabolism might be the cause of antagonism. The synergism/antagonism is thought to depend on the dose and duration of the co-exposure. However, the detailed mechanism is still not fully understood and needs further studies. Removal technologies of As and F from contaminated water is available but removal of such contaminants from food is yet to be developed. Antioxidants are useful to mitigate the toxic effects of As and F. This review focused on the effect of co-exposure, amelioration as well as removal techniques of As and F. K E Y W O R D Samelioration, arsenic, co-exposure, fluoride, mixture effect, removal technology

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Physico-chemical characterization of metal-doped bone chars and their adsorption behavior for water defluoridation

Cited by 65 publications

References 72 publications

Technologies for Decentralized Fluoride Removal: Testing Metallic Iron-based Filters

Technologies for Decentralized Fluoride Removal: Testing Metallic Iron-based Filters

Chromium(VI) removal by bone char–ZnO composite: Parameters optimization by response surface methodology and modeling

Environmental exposure of arsenic and fluoride and their combined toxicity: A recent update

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