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  • Fluoride Adsorption by Calcium Carbonate, Activated ...

    Jan 30, 2016  The aim of this research work is to develop a novel cost effective strategy for fluoride removal, applicable to rural areas of developing countries. Most of the adsorbent based technologies for fluoride removal work at acidic pH which is not a feasible condition for application in rural areas. This study investigates the feasibility of three low-cost adsorbents (calcium carbonate, activated ...

  • Cited by: 7
  • Calcium and zirconium modified acid activated alumina for ...

    EDX analysis of (a) fresh alumina (b) nascent CAZ adsorbent (before fluoride adsorption), and (c) spent CAZ adsorbent (after fluoride adsorption). After adsorption of fluoride on CAZ adsorbent, the peak of Al (aluminum) and Ca (calcium) can be observed to be reduced and enhanced, respectively (

  • Environments Free Full-Text Use of CaO Loaded ...

    Defluoridation in the presence of high calcium levels in potable groundwater is paramount, as the consumption of groundwater enriched with fluoride, and calcium has been implicated in causing chronic kidney disease of unknown etiology (CKDu) in Sri Lanka. CaO loaded mesoporous alumina (COMA) offers a great potential for defluoridation of potable water, but the effectiveness of COMA in the ...

  • Author: Mahesh Jayaweera, Madhusha Sudasinghe, Buddhika Gunawardana, Achini Peiris, Jagath Manatunge
  • Fluoride Adsorption by Calcium Carbonate, Activated ...

    The maximum fluoride adsorptions occurred as 12.5 mg/g, 1.2 mg/g, 10.99 mg/g for calcium carbonate, activated alumina and activated sugarcane ash, respectively.

  • Fluoride removal from water by adsorption—A review ...

    To increase the fluoride adsorption capacity of iron(III) oxide from the contaminated water, Biswas et al. incorporated tin(IV), a cation with high positive charge, into the lattice structure of iron(III) oxide and used as an adsorbent for the removal of fluoride from the aqueous phase. The fluoride adsorption capacity of synthetic iron(III ...

  • Cited by: 805
  • Eggshell-Derived Nanohydroxyapatite Adsorbent for ...

    Fluoride has become a notable toxicological environmental hazard worldwide because it is often found in groundwater. In the present study, hydroxyapatite adsorbent was synthesized from eggshell waste to remove fluoride from aqueous solution. XRD, FT-IR, and TGA techniques were used to characterize the prepared adsorbent. Batch adsorption studies were performed to examine the adsorption ...

  • Author: Kifle Workeneh, Enyew Amare Zereffa, Toshome Abdo Segne, Rajalakshmanan Eswaramoorthy
  • (PDF) Removal of fluoride ion from drinking water by a new ...

    Feb 16, 2020  A novel adsorbent made of freshly obtained calcium oxide nanoparticles and ferric hydroxide dispersed in chitosan matrix (CHI-FCA) was prepared.

  • (PDF) Fluoride Removal by Using Calcium-Aluminium ...

    Fluoride Removal by Using Calcium-Aluminium Magnesium Powder as Adsorbent. ... from water by mixed metal oxide adsorbent materials: A state-of-the-art review ... magnesium and calcium

  • Activated alumina - Wikipedia

    Activated alumina is used for a wide range of adsorbent and catalyst applications including the adsorption of catalysts in polyethylene production, in hydrogen peroxide production, as a selective adsorbent for many chemicals including arsenic, fluoride, in sulfur removal from fluid streams (Claus Catalyst process).

  • Dual adsorption behaviour of fluoride from drinking water ...

    Additionally, at higher solution pH, the presence of abundant hydroxyl ions competed with fluoride ions for the BCZC adsorbent active sites. Moreover, the lower fluoride adsorption capacities in acidic pHs might be a result of the formation of HF, that diminished the columbic attraction between fluoride and the adsorbent surface . 3.3.5.

  • Cited by: 10
  • Preparation of CaO loaded mesoporous Al2O3: Efficient ...

    Jul 15, 2014  The effects of various parameters (such as adsorbent dose, initial fluoride concentration, pH, contact time, competing ions) on the fluoride removal capacity of the synthesized materials have also reported here. The fluoride removal efficiency of CaO loaded Al 2 O 3 was compared with pure mesoporous Al 2 O 3. 2. Experimental section 2.1. Materials

  • (PDF) Removal of Fluoride from Water Using Iron Oxide ...

    Use of non-magnetic iron oxide-hydroxide nanoparticles having a spherical shape for the removal of fluoride from water is reported by Raul et al. [57]. They claimed that up to 70% of fluoride can ...

  • Preparation and Characterization of Fluoride Adsorption ...

    In this study, a novel mesoporous calcium oxide hollow sphere adsorbent was prepared to remove redundant fluoride ions from natural water. The as-prepared adsorbent was characterized by using several methods. The fluoride removal capacity of the adsorbent was studied by adsorption kinetics, isotherm, different pH, and co-existing ions.

  • Calcium Oxide - an overview ScienceDirect Topics

    Calcium Oxide. Calcium oxide (quicklime) is a highly corrosive solid with a melting point of 2572°C (Anon., 2008) and considered dangerous in terms of its effects on the skin and eyes. ... Three different modifications were made for preparing the sol-gel AA adsorbent. ... calcium oxide, and calcium fluoride. Tissues are bound with minimal ...

  • A critical study on efficiency of different materials for ...

    Mar 13, 2013  Mn-Ce oxide adsorbent by co-precipitation method was prepared and studied the role of prepared adsorbent in fluoride removal from the sorption isotherms. It has been shown that the maximum sorption capacities of fluoride on the powdered and granular Mn-Ce adsorbent

  • Doping of Calcium of Hydroxide on Bio-adsorbent for ...

    Initial fluoride concentration 5 mg/l and at room temperature is shown in Fig.2. The pH of solution was kept constant at 7. The adsorbent dosages was varied from 0.5 g/l, 1 g/l, 1.5 g/l, 2 g/l, 2.5 g/l and equilibrated for 120 min. The percent removal of fluoride increased with increase in adsorbent

  • Vol. 4, Issue 9, September 2015 Fluoride Removal from ...

    The adsorbent dose of 3 g/l was responsible for bringing down the fluoride concentration within permissible limit as prescribed by W.H.O. for 10 mg/l of initial fluoride concentration [13]

  • Defluoridation of calcium-rich groundwater using iron ...

    This study focuses on fluoride removal in the presence of calcium using iron oxide nanoparticles (FeONs) as an effective adsorbent in single- and multi-solute batch-studies. Fluoride and calcium removal by FeONs in single-solute batch-studies occurred only by adsorption.

  • Adsorption of Fluoride Using Nanoparticles of Iron and ...

    Nawlakhe et al. (1975) reported the Nalgonda technique for fluoride removal from water in which two chemicals alum in the form of aluminium sulphate and potassium aluminium sulphate and lime as calcium oxide was rapidly mixed with fluoride contaminated water

  • A Review on Adsorption of Fluoride from Aqueous Solution

    Sep 05, 2014  3.1. Oxides and Hydroxides. Many researchers reported successfully fluoride remediation using different metal oxides and hydroxides characterized by high surface area and numerous of them have used iron oxide as an adsorbent to treat heavy metals, anions, and hazardous elements in wastewater [].Hydrous titanium dioxide (TiO 2) has been found to be a potential selective adsorbent for fluoride ...

  • Adsorption equilibrium and kinetics of fluoride on sol-gel ...

    The calcium oxide-modified alumina adsorbent showed the highest fluoride adsorption capacities of 0.99 and 96.23mg/g at fluoride concentrations of 0.99 and 432mg/L, respectively. A pseudo-second-order model and an intraparticle kinetic model fitted well the adsorption kinetic data.

  • Adsorption Analysis of Fluoride Removal Using Graphene ...

    Graphene oxide with eggshells (GO/ES) adsorbent has been studied for fluoride ions (F –) removal.An adsorption study was conducted in batch experiments at different adsorption parameters, which are initial F – concentration, contact time, and temperature. The effects of these adsorption parameters towards F – removal by using GO/ES adsorbent were investigated.

  • Removal of Fluoride from Drinking Water using Pretreated ...

    Fly ash is cheap adsorbent for removal of fluoride from drinking water. Due to the presence of unburnt carbon particles and the other components like silica, alumina, iron oxides, calcium oxide and residual carbon make effective adsorbent of fly ash. Especially at high concentration of fluoride

  • Fluoride in Drinking Water and Nanotechnological ...

    Arising awareness of health hazards due to long-term exposure of fluoride has led researchers to seek for more innovative strategies to eliminate excess fluoride in drinking water. Fluoride-bearing chemicals in both natural and anthropogenic sources contaminate drinking water, which mainly cause for human fluoride ingestion. Hence, developing sustainable approaches toward alleviation is essential.

  • Fluoride removal from water using crushed limestone

    Fluoride removal from water using crushed limestone Suresh K Nath Robin K Dutta* Department of Chemical Sciences, Tezpur University, Napaam, Tezpur 784 028, India ... Some recently used adsorbent for fluoride are laterite 25, waste residue from alum ... 3 Calcium oxide CaO 40.0-45.0 4 Magnesium oxide MgO 0.8-1.2

  • REMOVAL OF FLUORIDE FROM AQUEOUS SOLUTION BY USING

    III.1 Effect of adsorbent dose: The influence of adsorbent dose on fluoride removal is checked at a fixed initial fluoride concentration of 5 mg/L, pH 6-7 at temperature 27±3°C. It was noticed that percentage removal of fluoride increased from 28% to 90.60% with an increase in adsorbent dose from 10 g/L to 100 g/L respectively.

  • A Comparative Study on Removal of Hazardous Anions from ...

    For example, reported the removal of fluoride by activated alumina up to 96.23 mg/g for water with a fluoride concentration of 432 mg/L in a sol-gel-derived activated alumina modified with calcium oxide. The reason for the higher adsorption capacity was the alkalinity of the adsorbent and the technique used for modification of the activated ...

  • A Review on Adsorption of Fluoride from Aqueous Solution

    The adsorbent could remove fluoride ions below 0.8 mg/L from solution with an initial fluoride concentration of 50 mg/L [141]. Chen et al. [142] investigated the possibility of fluoride removal using a nano-adsorbent bimetallic oxide adsorbent synthesized by co-precipitation of Fe(II) and Ti(IV) sulfate solution using ammonia

  • Use of Maize husk fly ash as an adsorbent for removal of ...

    some commercially available adsorbent such as Activated Alumina, calcium hydroxide [Ca(OH) 2], calcium chloride [CaCl 2] , and calcium sulphate [CaSO 4] have been used for removal of fluoride. However, the alternative sorbants have not displayed significant fluoride removal capacities

  • Fluoride Adsorption by Calcium Carbonate, Activated ...

    Jan 30, 2016  The aim of this research work is to develop a novel cost effective strategy for fluoride removal, applicable to rural areas of developing countries. Most of the adsorbent based technologies for fluoride removal work at acidic pH which is not a feasible condition for application in rural areas. This study investigates the feasibility of three low-cost adsorbents (calcium carbonate, activated ...

  • Removal of Fluoride from Contaminated Water Using Natural ...

    Nov 20, 2015  In this study, natural calcium-rich attapulgite (NCAP) was used to develop a low-cost adsorbent for removing fluoride (F−) from contaminated water. The results showed that calcination can dramatically increase the F− sorption capacity of NCAP and that the maximum F− sorption capacity occurred at 700 °C. The sorption of F− on NCAP heated at 700 °C (NCAP700) followed pseudo

  • [PDF] Adsorption Analysis of Fluoride Removal Using ...

    Graphene oxide with eggshells (GO/ES) adsorbent has been studied for fluoride ions (F – ) removal. An adsorption study was conducted in batch experiments at different adsorption parameters, which are initial F – concentration, contact time, and temperature. The effects of these adsorption parameters towards F – removal by using GO/ES adsorbent were investigated.

  • Calcium Oxide Adsorbent, Calcium Oxide Adsorbent Suppliers ...

    Alibaba offers 78 calcium oxide adsorbent products. About 82% of these are adsorbent, 71% are electronics chemicals, and 71% are paper chemicals. A wide variety of calcium oxide adsorbent options are available to you, such as coating auxiliary agents,

  • Fluoride in Drinking Water and Nanotechnological ...

    Arising awareness of health hazards due to long-term exposure of fluoride has led researchers to seek for more innovative strategies to eliminate excess fluoride in drinking water. Fluoride-bearing chemicals in both natural and anthropogenic sources contaminate drinking water, which mainly cause for human fluoride ingestion. Hence, developing sustainable approaches toward alleviation is essential.

  • Removal of Fluoride from Contaminated Water Using Natural ...

    Nov 20, 2015  In this study, natural calcium-rich attapulgite (NCAP) was used to develop a low-cost adsorbent for removing fluoride (F−) from contaminated water. The results showed that calcination can dramatically increase the F− sorption capacity of NCAP and that the maximum F− sorption capacity occurred at 700 °C. The sorption of F− on NCAP heated at 700 °C (NCAP700) followed pseudo

  • CALCIUM OXIDE (LIME, QUICKLIME) - Water Chemicals Codex ...

    All producers of calcium oxide must analyze and state the concentration of fluoride in the calcium oxide produced. Bulk Sample Collection : Sample in accordance with Standard for Lime, AWWA B202-77, American Water Works Association, Denver, Colorado (1977), except store final 2-1b sample in moistureproof .

  • A Review on Adsorption of Fluoride from Aqueous Solution

    The adsorbent could remove fluoride ions below 0.8 mg/L from solution with an initial fluoride concentration of 50 mg/L [141]. Chen et al. [142] investigated the possibility of fluoride removal using a nano-adsorbent bimetallic oxide adsorbent synthesized by co-precipitation of Fe(II) and Ti(IV) sulfate solution using ammonia

  • A Comparative Study on Removal of Hazardous Anions from ...

    For example, reported the removal of fluoride by activated alumina up to 96.23 mg/g for water with a fluoride concentration of 432 mg/L in a sol-gel-derived activated alumina modified with calcium oxide. The reason for the higher adsorption capacity was the alkalinity of the adsorbent and the technique used for modification of the activated ...

  • A critical study on efficiency of different materials for ...

    Calcium-based adsorbents. Calcium has a good affinity for fluoride anion and it has been used for fluoride removal [].Crushed limestone (99% pure calcite) used as an adsorbent for fluoride removal by batch studies and surface-sensitive techniques from solutions with high fluoride concentration ranging from 3 to ~2100 mg/L.

  • [PDF] Adsorption Analysis of Fluoride Removal Using ...

    Graphene oxide with eggshells (GO/ES) adsorbent has been studied for fluoride ions (F – ) removal. An adsorption study was conducted in batch experiments at different adsorption parameters, which are initial F – concentration, contact time, and temperature. The effects of these adsorption parameters towards F – removal by using GO/ES adsorbent were investigated.

  • Adsorption Equilibrium, Kinetics, and Thermodynamic ...

    This study investigated the performance of fluoride adsorption onto a specific tetrametallic oxide adsorbent Fe–Al–Ce-Ni (FACN) and the effect of temperature on adsorption performance. The adsorption performance was determined by adsorption equilibrium, kinetics, and thermodynamic parameters. The adsorption, kinetic, and thermodynamic parameters were compared alternatively.

  • Calcium Fluoride Raman Substrate AMERICAN ELEMENTS

    Calcium fluoride substrates have a wide range of transmission spectra and a single Raman peak at 321 cm-1 that is specific to calcium fluoride. Typical and custom packaging is available, as is additional research, technical and safety (MSDS) data.

  • SAFETY DATA SHEET - Fisher Scientific

    Calcium fluoride Revision Date 17-Jan-2018 Calcium fluoride (CaF2) 7789-75-5 100 4. First-aid measures General Advice If symptoms persist, call a physician. Eye Contact Rinse immediately with plenty of water, also under the eyelids, for at least 15 minutes. Get medical attention. Skin Contact Wash off immediately with plenty of water for at least 15 minutes.

  • CALCIUM OXIDE

    CALCIUM OXIDE Prepared at the 19th JECFA (1975), published in NMRS 55B (1976) and in FNP 52 (1992). Metals and arsenic specifications revised at the 59th JECFA (2002). An ADI ‘Not limited’ was established at the 9th JECFA (1965). SYNONYMS Lime; INS No. 529 DEFINITION Chemical names Calcium oxide C.A.S. number 1305-78-8 Chemical formula CaO

  • Reduction of Carbon Dioxide in the Environment Using ...

    in the Adsorbent according to the following equation. (2) 3.Result [3.1] Sample of 2g of calcium oxide was taken which resulted in the increase to 2.715g of calcium carbonate. For e final product is 0C -120C. This led to loss 2g of CaO 690mgofCO 2 So, 1g of CaOadsorbs 345mg of CO2 [practical]

  • Fluoride Removal Water Filtration System Crystal Quest

    Organic fluoride is present in vegetables, s, and nuts. Inorganic fluorine, under the name of sodium fluoride, is a waste product of aluminum and is used in some rat poisons. The MCL for drinking water established by the U.S. EPA is 4 mg/l. How It Works. Crystal Quest Eagle Fluoride Resin contains synthetic aluminum oxide adsorbent media.

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    • Pebble
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    • Gypsum
    • Marble
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    • Gold Ore
    • Copper ore
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