A review on adsorbents used for defluoridation of drinking water

Mondal, Poonam; George, Suja

doi:10.1007/s11157-014-9356-0

Cited by 77 publications

(34 citation statements)

References 50 publications

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“…It is necessary to take into consideration that hydroxyapatite, a calcium apatite mineral that is one of the components of vertebrate tissues such as scales, has been proven to possess very high ion removal ability, and also has been highlighted as an effective adsorbent in comparison with other adsorbents, such as calcite …”

Section: Resultsmentioning

confidence: 99%

“…49,50 It is necessary to take into consideration that hydroxyapatite, a calcium apatite mineral that is one of the components of vertebrate tissues such as scales, has been proven to possess very high ion removal ability, 51 and also has been highlighted as an effective adsorbent in comparison with other adsorbents, such as calcite. 52 Calcite has been used extensively as an adsorbent for heavy metal ions because the surface Ca(II) is easily subject to ion exchange and has an effect upon the adsorption properties of heavy metal ions. 53 In a study by Liaw et al 54 an eco-friendly and low-cost hydroxyapatite was extracted from Tilapia fish scales and used as the raw material to synthesize composite scaffolds.…”

Section: Toxicity Analysismentioning

confidence: 99%

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Use of fish scales as an adsorbent of organic matter present in the treatment of landfill leachate

Poblete

Cortés

Bakit

et al. 2020

J of Chemical Tech & Biotech

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This study focuses on the removal of organic pollutants present in landfill leachate (LL) using an adsorption process with activated carbon (AC) obtained from fish scales, and subsequently evaluates the reduction of toxicity in the wastewater obtained from the process. The AC obtained is a mesoporous material, with a cumulative pore area of 1.57 m2 g−1, Brunauer–Emmett–Teller (BET) of 1.8329 m2 g−1 and adsorption average pore width of 12.79833 nm. The maximum removal of pollutants was achieved at natural pH (6.71) of the LL, with a load of 3 g L−1, resulting in 60.1% colour and 37.3% chemical oxygen demand (COD). The rate of COD removal per g of AC increase had a maximum value of 5.6 at pH 10 when passing from 0.5 to 1 g AC. The lowest rate of 0.6 occurred for the same pH when it passed from 1 to 2 g AC. At pH 3 the second lowest rate of 3.3 was observed when passing from 2 to 3 g AC. At pH 3 there was always an increase in the rate as more AC was added. Conversely, at natural pH 6.71 the rate tended to decrease. At pH 10 the rate first decreased and then increased. At acidic pH, because it is the one with the lowest COD removal, it would be expected that by adding more AC the rate would continue to increase as there are easily accessible sites still available. Langmuir isotherms fitted adequately with the experimental data, providing an R2 of 0.9657, which is consistent with a monolayer adsorption pattern. The LL before the adsorption process had an inhibition ratio of 20.4%, due to the fact that leachate can be toxic because of the presence of hazardous organic compounds. After adsorption processes at pH 6.71, the inhibition ratios were 16.9%, 13.8%, 12.2% and 10.9% at AC loads of 0.5, 1, 2 and 3 g L−1, respectively, due to decreasing COD and colour of the LL over the course of the treatment. It was observed that the reduction of the inhibition ratio was greater at higher loads of adsorbent. © 2020 Society of Chemical Industry

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Section: Resultsmentioning

confidence: 99%

Section: Toxicity Analysismentioning

confidence: 99%

Use of fish scales as an adsorbent of organic matter present in the treatment of landfill leachate

Poblete

Cortés

Bakit

et al. 2020

J of Chemical Tech & Biotech

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“…The kinetics of any sorption process is a function of different parameters, such as the structural properties of adsorbent, nature and concentration of adsorbate and adsorbent-adsorbate interactions [54,55]. Adsorption kinetic study was carried out with initial fluoride concentration of 1.0 mg L À and adsorbent dose of 0.5 g L À1 at 313 K. Pseudo-first-order and pseudosecond-order adsorption model and intra-particle diffusion model were used to test the kinetic data in order to establish the mechanism of adsorption.…”

Section: Kinetic Studymentioning

confidence: 99%

Removal of fluoride by aluminum impregnated coconut fiber from synthetic fluoride solution and natural water

Mondal

Bhaumik

Datta

2015

Alexandria Engineering Journal

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Aluminum impregnated coconut fiber ash (AICFA) was used for removal of fluoride from synthetic fluoride solution. The AICFA showed high specific area and strong affinity toward fluoride. Synthesized AICFA was characterized by pH ZPC , FTIR, SEM and XRD studies. Adsorption kinetics indicated that the adsorption equilibrium was reached within 60 min and the adsorption process followed the pseudo-second-order kinetic model better. The Langmuir isotherm model could fit the experimental data well. Thermodynamic parameters such as Gibbs free energy (DG ), enthalpy (DH ) and entropy (DS ) change of sorption were also evaluated which indicated that the adsorption process was spontaneous, feasible and exothermic in nature. Furthermore, the coexisting anions had significant effect on fluoride adsorption. Moreover, desorption study with AICFA showed that nearly 98% of fluoride could be leached out at pH 12. Further, the reusable properties of the material supported the possibility of its use commercially. Ó 2015 Faculty of Engineering, Alexandria University. Production and hosting by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

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“…Malaysia alone generates about 4 million tons of OPA annually. OPA is siliceous in nature and this has drawn the interest of researchers to look for its various potential applications such as cement replacement material, adsorbent for the removal of zinc from aqueous solution, and flue gas desulphurization [4][5][6]. Still, most of the OPA generated ends up in landfill causing environmental problems.…”

Section: Introductionmentioning

confidence: 99%

Value-Added Utilization of Agro-Waste Derived Oil Palm Ash in Epoxy Composites

Rizal¹,

Fizree²,

M.³

et al. 2019

Journal of Renewable Materials

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Oil palm ash (OPA) is an agro-industry waste and it has disposable problems. In the present study, an effort was made for value addition to OPA by incorporating it as a micro-filler in different concentration (0, 10, 20, 30, 40, and 50%) and sizes (100, 200, and 300 mesh size particles) in the epoxy matrix. Prepared micro OPA was having a crystallinity index of 65.4%, high inorganic elements, and smooth surface morphology. Fabricated composites had higher void content as compared to neat epoxy matrix. Mechanical properties of fabricated composites had a maximum value at 30% loading of 300 mesh-size filler due to its low void content and size as compared to filler of 100 and 200 mesh size. Further increase in the concentration of OPA filler after 30 wt% of loading leads to the agglomeration of OPA microparticles and thereby resulted in the reduction of mechanical characteristics such as tensile strength, tensile modulus, flexural strength and flexural modulus of the composites. However, elongation at break decreased with increase in filler content at all percentage. Thermal stability and char residue percentage of composite increased with the concentration of filler at all percentage. Surface morphology of composite showed that OPA incorporation lead towards its roughness and cracks were originated from the site of OPA embedded in the epoxy matrix. The 300 meshsize particles were having the best effect on composite as compared to 100 and 200 mesh-size filler.

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A review on adsorbents used for defluoridation of drinking water

Cited by 77 publications

References 50 publications

Use of fish scales as an adsorbent of organic matter present in the treatment of landfill leachate

Use of fish scales as an adsorbent of organic matter present in the treatment of landfill leachate

Removal of fluoride by aluminum impregnated coconut fiber from synthetic fluoride solution and natural water

Value-Added Utilization of Agro-Waste Derived Oil Palm Ash in Epoxy Composites

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