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The reaction between a sodium fluoride solution and calcium oxide, sulphate, carbonate, rock phosphate, fluorapatite and chlorapatite has been studied. It is shown (1) that rock phosphate, fluorapatite and chlorapatite do not enter into any reaction with the dissolved fluoride; (ii) that calcium oxide and sulphate remove fluorine from its aqueous
The fluoride removal of 5158 % was obtained by 15 g dose of adsorbent with 5 mg/l of initial fluoride in the pH range of and for a minimum contact time of 2 hours. The exhausted adsorbent was used for making construction products such as bricks, tiles, road subbase, cement and door panels [32].
and readily available phosphate source that could be used to as an adsorbent [11]. Bone char, a mixed adsorbent containing around 10% carbon and 90% calcium phosphate, is mainly produced by the carbonization of bones. Its potential as a defluorinating agent and to remove heavy metals from solution has also been reported in the literature [12].
Phosphate Removal from Aqueous Solutions Using Calcium we report phosphate removal from aqueous solution using a calcium silicate hydrate (CSH) adsorbent prepared from blast furnace slag (BF slag), a highvolume byproduct pro g of slagCSH (Step 3). Based
responsible for removal of fluoride by calcium bearing rock phosphate mineral. Based on this hypothesis fluoride removal exercises were carried out at pH 4,5 and 6. Effect of mineral quantity and shaking time Different quantities of mineral were taken separately in 100 mL of 10mg/L fluoride solution of pH 4, 5 and 6 and kept for batch shaking
The objective of this study is to study the removal of phosphate (PO43) and fluoride (F) by using calcite from the thinfilm transistor liquid crystal display (TFTLCD) manufacturing wastewater. The highest phosphate adsorption capacity of mg/g calcite was found at pH It is proposed that both adsorption and precipitation were involved in the removal of phosphate and fluoride.
Static defluoridation of high fluoride (1012 ppm) water by sixteen different combinations of tricalcium phosphate (TCP), bone char (BC), hydroxyapatite (HAP), and related substances has been investigated. Defluoridation of 100 mL of the water by 300 mg of relatively insoluble phosphates is only 6070 percent complete. Defluoridation is 30 percent more efficient, however, when a more soluble
In view of this fact, a new adsorbent calciamagnesia (CMA) which has both magnesium and calcium has been synthesized which can remove fluoride effectively from drinking [Show full abstract
adsorbent surface for the fluoride ion [18]. Fluoride ion is precipitated as calcium fluoride after reaction with lime, limestone, calcium chloride, calcium phosphate, calcium nitrate and calcium sulfate [19]. Adler et al. [20] conducted the first attempt for the removing of
#0183;#32;The fluoride adsorption by ZICSC was above 90% for the entire pH range of 29. The Langmuir maximum capacity of ZICSC for fluoride was mg/g at pH The applicability of zirconiumimpregnated coconut fiber carbon (ZICFC) as an adsorbent for fluoride removal from water was also investigated .
Experimentation on bone charbased treatment for fluoride removal from drinking water in Senegal S. Sorlini amp; D. Palazzini, Italy experimentation carried out using animal bone char as adsorbent material for fluoride removal. Possible composed of calcium phosphate (5780%), calcium carbonate (6
adsorbent for defluoridation. Tricalcium phosphate is another adsorbent that has gel structure and better characteristics than that of activated alumina [3]. Both the adsorbents show increased adsorption capacity in the powder form as the surface area and consequently more
commercially available adsorbent such as calcium hydroxide [Ca(OH) 2], calcium chloride [CaCl 2], and calcium sulphate [CaSO 4] 19 have been used for removal of fluoride. Calcium containing materials were used by some researchers to remove fluoride from water19,20.
#0183;#32;Activated alumina (AA) is widely used adsorbent for the treatment of fluoride contaminated water. However, the process is highly pHdependent and during regeneration of saturated adsorbent, a material loss of about 510 % is reported which results in a
fluoride minerals, velocity of flowing water, pH, temperature, and concentration of calcium and bicarbonate ions in water [1]. The other sources of fluoride occurrence in water are industrial discharge from aluminum industries, phosphate industries, coal plants as well as due to water, food, air, medicament and cosmetics.
Read quot;Removal of Fluoride from Contaminated Water Using Natural CalciumRich Attapulgite as a LowCost Adsorbent, Water, Air, Soil Pollutionquot; on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.
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