Treatment of High Fluorine Water by Zeolite

Cao, Meng

doi:10.4028/www.scientific.net/amm.685.468

Cited by 4 publications

(2 citation statements)

References 3 publications

(1 reference statement)

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“…Toothache, inflammation and dental extractions are some of the symptoms of dental fluorosis. This dental fluorosis can be treated by few techniques, mainly tooth whitening and other procedures to remove surface stains (Cao 2014). Concurrently, bleaching teeth may temporarily worsen the appearance of dental fluorosis.…”

Section: Health Hazardsmentioning

confidence: 99%

Treatment of fluoride-contaminated water. A review

Kumar¹,

Suganya²,

Srinivas³

et al. 2019

Environ Chem Lett

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Delivering the right amount of fluoride to drinking water protects the teeth from decay and reduces the risk of cavities. Nonetheless, fluorosis has been diagnosed as the result of excessive exposure of fluoride, which induces brain impairment, muscle disorders and hyperactivity. Fluoride ingestion during the formation of the tooth enamel is the main reason for fluorosis, which is characterized by hypomineralization. Dissolution of fluoride-containing rock minerals contributes to naturally occurring fluoride contamination in water. The intentional addition of fluoride to water in dental care is alarming in growing countries such as India. This article reviews the origin of fluoride, the analysis of fluoride derivatives and the technologies to remove fluoride from water. The manuscript presents adsorption techniques for fluoride removal, using different types of adsorbents. The adsorption capacities of adsorbents under various conditions, such as contaminant concentration, adsorbent dosage, time, pH and temperature, are presented. Adsorbent types include alumina, zeolites, organic waste, shell-based and carbon-based including graphite and carbon nanotubes. Defluoridation of water using clays and muds, modified activated alumina, chitosan derivatives and composites are also discussed.

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Section: Health Hazardsmentioning

confidence: 99%

Treatment of fluoride-contaminated water. A review

Kumar¹,

Suganya²,

Srinivas³

et al. 2019

Environ Chem Lett

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“…In Mexico, in at least 6 of its states, high concentrations of fluoride in the water have been reported in different communities in the range of 3.8 to 17.7 mg•L −1 , far exceeding the limit established by the Mexican norm, NOM-127 -SSA1-1994 which establish as a maximum limit a concentration of 1.5 mg•L −1 of fluorine in water for human consumption or as recommended by the World Health Organization (WHO) [3] 1 mg•L −1 . As an alternative for the removal of fluorides in water are the adsorption processes with materials that are efficient, low cost and easy to implement, natural zeolites meet these particularities and their different physical and chemical properties give these materials characteristics only that can be used [4,5], particularly the properties of zeolites allows us to make a modification of its chemical composition surface on the ionic species present, in order to obtain a modified material that could be used as an adsorbent selective [6,7]. Mexico has large zeolitic deposits in several of its states and with different types of zeolites, particularly in this work a zeolite of the clinoptilolite type was used from a deposit in the place "Las Crucecitas" belonging to the municipality of Etla, in the central valley region of the state of Oaxaca in the southeast of Mexico.…”

Section: Introductionmentioning

confidence: 99%

Removal of Fluoride in Water with Mexican Natural Zeolite

Sampedro-Duran

Torres-Rodríguez

Gutiérrez-Arzaluz

et al. 2018

The 2nd International Research Conference on Sustainable Energy, Engineering, Materials and Environment

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This work presents the results of the fluoride removal in water, through an adsorption process with the use of a natural Mexican zeolite conditioned with calcium, manganese or iron in a fixed bed column system. The XRD and FTIR characterization results demonstrated that the conditioning modifies the surface chemical composition of the zeolite and the SEM/EDS analysis corroborates the increase of the exchanged ions. The conditioning of the zeolite generated an increase in the adsorption capacity of fluorine, the best percentage of removal obtained from fluoride ions was 98%, for a water with a concentration of 10 mg·L−1 with the conditioned zeolite with iron.

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