Preparation of Al–Ce hybrid adsorbent and its application for defluoridation of drinking water

Han, Ling; Deng, Shubo; Z, Li; Yu, Gang; Huang, Jun

doi:10.1016/j.jhazmat.2010.03.021

Cited by 158 publications

(81 citation statements)

References 34 publications

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“…However, as reported in literature, adsorption technology is the most preferred method of defluoridation for impoverished people and mostly living in developing countries (Fawell et al 2006). Adsorption process is a simple but attractive technique because of its removal efficiency, selectivity, high-quality effluent, as well as its cost-effectiveness (Fan et al 2003;Liu et al 2010).…”

Section: Introductionmentioning

confidence: 99%

Removal of Fluoride from Drinking Water Using Novel Adsorbent Magnesia-Hydroxyapatite

Mondal

George

2015

Water Air Soil Pollut

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In many parts of the world, fluoride in drinking water is responsible for notable public health issues. The present study is aimed to prepare a new adsorbent magnesia-hydroxyapatite (Mg-HAP) that can serve as a valuable defluoridating agent. Characterization of the synthesized adsorbent was done by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), Transmission electron microscope (TEM), and Scanning electron microscope (SEM)/Energy-dispersive X-ray spectroscopy (EDX) analysis to reveal the bonding patterns, phase characteristics, and microstructural and morphological details. The influences of pH, adsorbent dose, contact time, and initial fluoride concentration and the effect of interfering anions were studied. The defluoridation capacity was evaluated to be 1.4 mg/g, and the adsorbent showed very good capability to remove fluoride from contaminated water over a wide range of pH. Equilibrium modeling was done, and the experimental data was fitted into Langmuir, Freundlich, Temkin, and Dubinin-Radushkevich isotherms. Study of the kinetic data for the adsorption process revealed that it follows pseudo-second-order reaction. It also indicated that the intraparticle diffusion contributes to the rate-determining step in the process. The quality of treated water was analyzed for total dissolved solids (TDS), turbidity, residual calcium, residual phosphorus content, electrical conductivity, hardness, and total alkalinity. The results obtained were very promising and confirmed the prospects of usage of Mg-HAP in defluoridation of drinking water.Abbreviations q e Amount of adsorption at equilibrium (mg/g) q t Amount of adsorption at time t (mg/g) C 0 Initial concentrations of fluoride (mg/L) C e Equilibrium concentrations of fluoride (mg/L) C t Concentration of fluoride at time t (mg/L) vVolume of the aqueous solution (L) m Adsorbent mass (g) Q 0 Maximum adsorption capacity reflecting complete monolayer (mg/g) R L Separation factor depicting favorability of the process bLangmuir constant related to energy K f Freundlich constants (mg/g) N Heterogeneity factor R Universal gas constant (8.314 J/mol K) T Temperature (K) A T Temkin isotherm equilibrium binding constant (L/g) B T Temkin isotherm constant b 1 Adsorption rate constant of first order reaction (min −1 ) b 2 Adsorption rate constant of first order reaction (g mg −1 min −1 ) k i Intraparticle diffusion rate constant (mg g −1 min −1/2 ) a Initial adsorption rate (mg g −1 min −1 ) α Desorption rate (g mg −1 ) Water Air Soil Pollut (2015) 226:241

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Section: Introductionmentioning

confidence: 99%

Removal of Fluoride from Drinking Water Using Novel Adsorbent Magnesia-Hydroxyapatite

Mondal

George

2015

Water Air Soil Pollut

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“…Almost all the natural adsorbents studied such as SMP, chitin -cellulose composite, 20 % La-chitosan, Cynodan dactylon, Phylanthus embilica have optimum removal efficiency at neutral pH range (Asgari et al 2012;Jayapriya et al 2011;Kamble et al 2007;Alagumuthu et al 2010;Veeraputhiran and Alagumuthu 2011). AIAA, MAAA, MCAA, MOCA, carbon slurry, cerium dispersed carbon, carbonaceous materials, all forms of hydroxyapatite studied, charcoal containing calcium compound and Al-Ce hybrid adsorbent also showed best adsorption capacity for neutral pH (Tripathy et al 2006;Maliyekkal et al 2008;Tripathy and Raichur 2008;Maliyekkal et al 2006;Gupta et al 2007;Sivasankar et al 2013;Mendoza et al 2012;Tchomgui-Kamga et al 2010;Liu et al 2010). Under acidic and alkaline conditions, the least adsorption took place with these adsorbents.…”

Section: Ph Of Watermentioning

confidence: 91%

“…2.65 times higher than that of normal AA (2.851 mg/g). An attempt has been by Liu et al (2010) for combining aluminum and cerium and preparing aluminum-cerium (Al-Ce) hybrid adsorbent through the co-precipitation method. A synergistic interaction between aluminum and cerium compounds occurs in the hybrid adsorbents, which was found to be advantageous for fluoride removal.…”

Section: Aluminum Based Adsorbentsmentioning

confidence: 99%

A review on adsorbents used for defluoridation of drinking water

Mondal

George

2014

Rev Environ Sci Biotechnol

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Drinking water has been contaminated over decades with some very detrimental compounds such as fluoride. Exposure to fluoride through drinking water above the permissible limit (1.0-1.5 mg/L) causes severe dental and skeletal fluorosis. Adsorption technique which deals with adsorbents for fluoride removal from an aqueous solution is a highly efficient and selective process. This review paper provides insights on adsorbents used and developed by researchers for defluoridation of drinking water. It includes various categories of adsorbents used and parameters affecting the whole process. Adsorbents studied by researchers are enlisted with their adsorption capacity, optimum pH, temperature, equilibrium isotherm, kinetics, interfering ions, thermodynamic studies and regeneration procedure adapted. Efforts are needed to develop low cost reusable adsorbents with high adsorption capacity. Although, some adsorbents are reported to show remarkable capacity for fluoride removal; still there is an urgent need for development of more novel adsorbents holding both economic and technological benefits.

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“…Fluoride analyses were performed by Hach-Lange HQ40d multi-measurement device (Fluoride Meter -product code: 2589 99) by TISAB (total-ionic strength adjustment buffer) method (Liu et al, 2010). Fluoride measurement using ion selective electrode is suggested by EPA, APHA and ASTM (APHA, 1998).…”

Section: Measurement Of Fluoride Contentsmentioning

confidence: 99%

Evaluation of Fluoride Concentration and Daily Intake by Human from Tea Infusions

Atasoy¹,

Yeşilnacar²,

Atasoy³

2016

Harran Tarım Ve Gıda Bilimleri Dergisi

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The objectives of this study were to determine the fluoride content of tea and the percentage of the average daily intake of fluoride from tea extracts after 10 min brewing. The fluoride content in infusion of commercially available Turkish and Ceylon black, green teas were determined by ion selective electrode. The content of fluoride in tea infusion ranged from 1.010 to 2.89 mg L -1. The fluoride concentrations determined in Turkish black and green tea infusion were higher than in Ceylon black and green tea. The intake of fluoride will be in the range of 30.2-50.0% and 48.3-80.0% for adult and children-teenagers tea drinkers respectively, consuming ten glasses or five cups (1000 ml) of black tea per day. People are often exposed to multiple sources of fluoride, such as in food, water, air and excessive use of toothpaste. The control of tea quality is important to protect the human against to too high uptake of this element from black tea, which is the most popular beverage in Turkey. Excessive intake of fluoride with black tea, especially in the regions with its high level in the drinking water, increases the risk of dental fluorosis in children during the years of tooth development. Keywords: Tea infusion, Fluoride, Black tea, Green tea Demlenmiş Çayların Florür Miktarlarının ve Günlük Florür Alımının Belirlenmesi ÖzBu çalışmanın amacı Türk ve Seylan siyah ve yeşil çaylarının 10 dakika demlendikten sonraki Florür miktarlarını ve bu miktarların günlük flor ihtiyacını karşılama oranlarını ion selektif elektrot kullanarak belirlemektir. Demleme sonrası çayların florür miktarları 1.010 ile 2.89 mg L -1 arasında değişmiştir. Siyah ve yeşil Türk çaylarının florür miktarlarının Seylan çaylarından daha yüksek olduğu belirlenmiştir. Yetişkin ve çocuk bir birey günde 1000 ml siyah çay (10 bardak veya 5 fincan) tükettiğinde sırasıyla günlük florür ihtiyacının %30.2-50.0 ve %48.3-80.0'ini karşılayacaktır. İnsanlar gıda, su, hava ve diş macunları gibi farklı kaynaklardan florür almaktadırlar. Bu nedenle, özellikle sularında fazla miktarda florür bulunan bölgelerde, çocuklar gelişme dönemlerinde florisis riski ile karşı karşıyadır.

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Preparation of Al–Ce hybrid adsorbent and its application for defluoridation of drinking water

Cited by 158 publications

References 34 publications

Removal of Fluoride from Drinking Water Using Novel Adsorbent Magnesia-Hydroxyapatite

Removal of Fluoride from Drinking Water Using Novel Adsorbent Magnesia-Hydroxyapatite

A review on adsorbents used for defluoridation of drinking water

Evaluation of Fluoride Concentration and Daily Intake by Human from Tea Infusions

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