Adsorption of Fluoride from Water Using Sintered Clay-Hydroxyapatite Composites

Yakub, I.; Soboyejo, W. O.

doi:10.1061/(asce)ee.1943-7870.0000692

Cited by 26 publications

(21 citation statements)

References 39 publications

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“…This affords the CWFs the robustness required for the removal of other contaminants besides microbial contaminants from water. The removal of chemical contaminants such as arsenic, iron and fluorine has been reported [14][15][16]. Moreover, it has also been shown that with the right amount of iron oxide doping, the CWFs are capable of removing viruses [17,18].…”

Section: Introductionmentioning

confidence: 99%

Mechanical properties, modeling and design of porous clay ceramics

Yakub

Soboyejo

2012

Materials Science and Engineering: A

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Section: Introductionmentioning

confidence: 99%

Mechanical properties, modeling and design of porous clay ceramics

Yakub

Soboyejo

2012

Materials Science and Engineering: A

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“…It is found that with increase in hydroxyapatite in the mixture; the ceramic wares became less porous thus decreasing the water percolation through them [17]. From Table 3, this phenomenon is confirmed from ceramic water filter ware with number 3 and 5.…”

Section: Resultsmentioning

confidence: 65%

“…Hydroxyapatite removes fluoride following three major different mechanisms such as fluoro-apatite formation; F-ions substituting OH-ions, and calcium fluoride formation [17,18]. In this article, importance is also given to the microstructural changes that may occur with sintering.…”

Section: Desalination and Water Treatmentmentioning

confidence: 99%

“…This addition may decrease the flow rate of the filter since higher content of hydroxyapatite may decrease the porosity of the ceramic materials manufactured [17]. Plasticity of this mixture was attained with addition of 175 mL of water.…”

Section: Processingmentioning

confidence: 99%

“…This temperature is sustained for 5 h [8]. All the ceramic composite water filters prepared from different mixture ratio of pond sand, sesame sawdust, hydroxyapatite, Ayurvedic samples 1 and 2, and titanium iso-propoxide are now ready for use [17,18]. The thermogravimetric analysis of the pond sand sample is provided in Fig.…”

Section: Sintering Proceduresmentioning

confidence: 99%

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Local material composite sintered systems for fluoride removal

Choudhary

Sharma

Plappally

2014

Desalination and Water Treatment

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A B S T R A C TThe article elaborates the development of gravity-based water filtration systems capable of removing fluoride using natural organic material. In this study, the precipitation and dissolution reaction occurring in suspension of hydroxyapatite (HAP) as addition of fluoride were investigated under well-defined condition. This process is set to occur in a quasi-static gravity-based water filter system. This system is a (pond sand, organic material (gaur seed powder, neem, sesame sawdust, and Ayurvedic waste), water, and HAP mixture) composite ceramic. This article illustrates these ceramic material systems manufactured using distinct permutations of pond sand and organic materials. HAP is introduced into the composite mix of pond sand and organic materials to manufacture some of the sintered ceramic filtration material systems tested here. The fluoride removal efficiency of these variant systems is discussed. The energy dispersive X-ray spectroscopy studies of the ceramics provided the mineral content within the system variants. At high temperatures beyond 600˚C, the sintered hydroxyapatite is observed to have a microstructural transformation from amorphous to crystalline. The surface properties of these sintered as well as raw materials used in the production of the ceramic composite are also investigated. A mathematical multivariate regression model is derived providing a relationship between the effectiveness of the water filtration systems as a function of the raw material composition and properties. The Ayurvedic waste material was found to be a good substitute for HAP for fluoride removal. The proposed treatment system is appropriate and suitable approach for fluoride removal in rural areas, because of its simplicity and easy operation and handling. Since Ayurvedic and organic waste materials are easily available at low cost, the proposed method is very suitable for the people living in low-income rural areas of developing countries like India.

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Macroporous hydroxyapatite ceramic beads for fluoride removal from drinking water

Nijhawan

Butler

Sabatini

2017

J of Chemical Tech & Biotech

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BACKGROUND This study evaluates the capacity of hydroxyapatite ceramics to remove fluoride from drinking water. Porous hydroxyapatite ceramic beads approximately 5 mm in diameter were fabricated using soluble potato starch as well as insoluble rice starch, wheat starch, corn starch, and cellulose as pore‐forming agents. RESULTS Calcination of hydroxyapatite particles, followed by mixing with starches and water, compaction, and sintering at 1200 °C resulted in the formation of macroporous ceramic beads with maximum fluoride adsorption capacities ranging from 7 to 12 mg g−1, depending on the relative proportions of different pore‐forming agents. Increasing the insoluble starch content from 0 to 25% by volume in ceramics with 50% by volume hydroxyapatite led to a marked improvement in fluoride adsorption by creating interconnected macropores, as evidenced by scanning electron microscopy (SEM). Calcination of hydroxyapatite powder at or above 400 °C before ceramic preparation was required to obtain a ceramic material with sufficient structural integrity to withstand operation and handling after sintering. CONCLUSION This study evaluates the potential of using porous hydroxyapatite ceramics to remove fluoride from drinking water. An increase in fluoride adsorption capacity was consistent with the observation of macropores in SEM images as well as an increase in open porosity and specific surface area (SSA) measurements as the insoluble starch content was increased from 0 to 25%. © 2016 Society of Chemical Industry

show abstract

Adsorption of Fluoride from Water Using Sintered Clay-Hydroxyapatite Composites

Cited by 26 publications

References 39 publications

Mechanical properties, modeling and design of porous clay ceramics

Mechanical properties, modeling and design of porous clay ceramics

Local material composite sintered systems for fluoride removal

Macroporous hydroxyapatite ceramic beads for fluoride removal from drinking water

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