calcium oxide as fluoride adsorbent

CALCIUM SALTS-PART I THE MECHANISM OF FLUORINE …

14 Freundlich absorption isotherm curves for calcium carbonate and sodium fluoride solution at different time intervals its aqueous solution by calcium carbonate takes place by the process of adsorption, and not by a process of double decomposition such as takes place between calcium oxide or calcium sulphate and sodium fluoride solu- tIon.

Contact us

Synthesis and Study of an Efficient Metal-Organic ...

 · Excessive fluoride in the human body can mineralize calcium hydroxyphosphate to calcium fluorophosphate, ... C. Zhang, Y. Li, T. J. Wang, Y. Jiang, and J. Fok, "Synthesis and properties of a high-capacity iron oxide adsorbent for fluoride removal from drinking water," Applied Surface Science, vol. 425, pp. 272–281, 2017.

Contact us

US20090270253A1

The invention provides a composite metal oxide adsorbent for fluoride removal and the preparation method thereof. Said composite metal oxide adsorbent for fluoride removal comprises: 0.05-0.15 molar parts of transition metal, 0.2-0.6 molar parts of Al and/or Mg, and 0.05-0.15 molar parts of rare earth metal. The composite metal oxide adsorbent for fluoride removal has a saturation …

Contact us

Calcium oxide nanoparticles as an adsorbent for the ...

Calcium oxide (CaO) nanoparticles were synthesized by the sol-gel method. The particles were characterized by FT -IR, TGA, DTA, TEM and DLS analysis. The ability of the CaO nanoparticles for removal of fluoride from aqueous solution through adsorption has been investigated. All the experiments were carried out by batch mode. The effect of various parameters viz. contact time, pH effect (pH 2-1 ...

Contact us

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

The total removal of fluoride was ascribed to the formation of aluminum fluoride (AlF 3) complexes and calcium fluorite precipitate other than fluoride ion adsorption. All the combinations manifested that the residual levels of fluoride (0.8–1.47 mg L −1 ) were within the permissible level stipulated by the WHO for drinking water (0.6–1.5 ...

Contact us

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.

Contact us

Fabrication, Characterization, and Application of a ...

 · Coexisting arsenic (As) and fluoride (F) in groundwater poses severe health risks worldwide. Highly efficient simultaneous removal of As and F is therefore of great urgency and high priority. The purpose of this study was to fabricate a novel composite adsorbent and explore the mechanism for concurrent removal of As(V) and F at the molecular level. This bifunctional adsorbent …

Contact us

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 and surface area of ash make it a good candidate ...

Contact us

WO2009152172A2

Bio-ceramic compositions for removing fluoride from water, and methods for making the same are disclosed. The bio-ceramic composition may comprise alumina, calcium oxide, sulfur, and/or carbon. The bio-ceramic composition may be produced from at least one natural media, such as chitin or eggshell membrane. The bio-ceramic composition may realize an initial fluoride adsorption capacity, in ...

Contact us

Surface modified exfoliated graphite as a novel adsorbent ...

 · This is either due to the formation of weak HF, or electrostatic repulsive forces between negatively charged fluoride and the negatively charged oxide surface of the adsorbent . However, fluoride removal up to 96.8% could be achieved by alum impregnated exfoliated graphite (AIEG) composites at pH 6.8, and thereafter remains almost the same.

Contact us

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.

Contact us

Removal of fluoride ion from drinking water by a new Fe(OH ...

A novel adsorbent made of freshly obtained calcium oxide nanoparticles and ferric hydroxide dispersed in chitosan matrix (CHI-FCA) was prepared. Batch adsorption study was performed to analyze the effect of initial concentration, contact time, pH, and adsorbent dose on fluoride sorption on CHI-FCA.

Contact us

Eggshell-Derived Nanohydroxyapatite Adsorbent for ...

XRD to confirm the presence of calcium oxide. In phase II, a stoichiometric amount of calcined eggshell powder (calcium oxide) and 0.3M H 3 PO 4 (to obtain the Ca/P mole ratio equal to 1.67) was added and dispersed in distilled water in a 500mL beaker. Analytical-grade phos-phoric acid was diluted to 0.3M and added dropwise into

Contact us

Removal of fluoride ion from drinking water by a new Fe(OH ...

A novel adsorbent made of freshly obtained calcium oxide nanoparticles and ferric hydroxide dispersed in chitosan matrix (CHI-FCA) was prepared. Batch adsorption study was performed to analyze the effect of initial concentration, contact time, pH, and adsorbent dose on fluoride …

Contact us

Preparation of CaO loaded mesoporous Al2O3: Efficient ...

 · 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 section2.1. Materials

Contact us

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.

Contact us

5. Fluoride removal from a natural water sample

 · Synthesis and characterisation of cerium(IV)-incorporated hydrous iron(III) oxide as an adsorbent for fluoride removal from water†Kankan Mukhopadhyay b, Abir Ghosh a, Supriyo Kumar Das b, Bibhutibhushan Show c, Palani Sasikumar * a and Uday Chand Ghosh * a a Department of Chemistry, Presidency University, 86/1 College Street, Kolkata-700073, India. E-mail: …

Contact us

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 96.23 mg/g at fluoride concentrations of 0.99 and 432 mg/L, respectively. A pseudo-second-order model and an intraparticle kinetic model fitted well the adsorption kinetic data.

Contact us

Calcium Oxide

Calcium is an essential mineral nutrient for both plants and animals. It is a soft alkaline earth metal with a shiny silver surface, which gradually reacts with the atmosphere to form a dull gray-white coating of calcium oxide and calcium nitride. Discovered by Sir Humphry Davy in 1808, calcium is the fifth most abundant element by mass in both ...

Contact us

A novel alum impregnated CaO/ carbon composite for de ...

Excessive fluoride concentration (>1.5 mg/L) in water adversely affects human teeth and bones. The present study focuses on the development of a fluor…

Contact us

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. The fluoride ...

Contact us

Removal of Fluoride from Drinking Water Using Modified ...

In this study, calcium oxide and manganese oxide coating were done on sol-gel-derived activated alumina to enhance its fluoride removal efficiency. The main challenge encountered during the adoption studies is the separation of adsorbent after use from water samples.

Contact us

Zeolitic imidazolate framework-8 nanoparticle: a promising ...

 · Fluoride removal from living entities is the foremost task as it is a non-biodegradable and harmful pollutant mostly found in groundwater. Nowadays, the application of nanoparticles as an adsorbent of fluoride is becoming an intense research due to its high surface area. In the present study, zeolitic imidazolate framework-8 (ZIF-8) nanoparticles adsorption behavior and its efficiency in ...

Contact us

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

Contact us

Removal of Fluoride from Water by Adsorption onto ...

 · Rare earth mineral based adsorbent viz. lanthanum oxide was investigated for potential application in defluoridation of drinking water for isolated and rural communities. Results of batch experiments indicated about 90% removal in 30 min from a 4 mg L−1 synthetic fluoride solution. The effects of various parameters like contact time, pH, initial concentration, and sorbent dose on sorption ...

Contact us

US5043072A

 · Dsiclosed is a method of treating fluoride-containing water, which comprises a reaction step where a calcium compound and/or an aluminium compound are/is added to fluoride-containing water while the pH value of the resulting suspended liquid is adjusted to fall within the range of from 6 to 8, and at least a part of the concentrated suspension to be formed in the membrane-separation step of ...

Contact us

Preparation and Characterization of Fluoride Adsorption ...

Preparation and Characterization of Fluoride Adsorption Efficiency from Water of Mesoporous Hollow CaO Spheres Buy Article: $106.72 + tax (Refund Policy) Authors: Li, Jie; Chang, Qi-Gang; Ma, Wu-Wei; Lu, Jian-Jiang; Tong, Yan-Bin; Zhou, Li. Source: Science of …

Contact us

Optimization of fluoride removal from aqueous solution ...

Removal of fluoride was done by adsorbent prepared from leaves of Syzygium cumini. Adsorbent preparation was done by calcination (500°C) and characterized by multiple physiochemical, and micro-analytical techniques including EDS, FT-IR, TGA and XRD. The adsorbent was mainly composed of calcium carbonate and calcium oxide/hydroxide. Adsorption study revealed a maximum fluoride …

Contact us

Preparation of a novel CeO2/SiO2 adsorbent and its ...

 · Also, the concentration of fluoride in water cannot be reached to less than 2 mg/l by precipitation of calcium fluoride with lime (Fan et al., 2003; Wang and Reardon, 2001). Adsorption technique, with the advantages such as the fast kinetic, ease of handling, and simple equipment, has been widely used in the research and industrial application.

Contact us

Removal of Fluoride from Aqueous Solution using Calcium ...

 · The results suggested that calcium peroxide nanoparticles can be considered as a promising adsorbent for fluoride removal. INTRODUCTION Fluoride pollutants in drinking water attract great attention worldwide due to their hazards towards humans, such as dental problems, bone deficiency, cancer, thyroid, brain damage, etc [ 1 ].

Contact us

Defluoridation using novel chemically treated carbonized ...

 · Novel defluoridating adsorbent was synthesized by chemical treatment of carbonized bone meal using aluminum sulfate and calcium oxide. Precursor for chemical treatment was prepared by partial carbonization of raw bone meal at 550 °C for 4 h. Maximum fluoride removal capacity was 150 mg/g when carbonized bone meal (100 g/L) was treated with aluminum sulfate (500 g/L) and calcium oxide …

Contact us

Excellent fluoride decontamination and antibacterial ...

 · The fluoride loaded adsorbent was efficiently regenerated by using an alkali solution. Interestingly, the developed nanomaterial not only showed excellent fluoride removal capacity but also demonstrated good antibacterial activity against Escherichia coli with IC50 (25 μg/mL).

Contact us