Iranian Journal Of Health Sciences
علوم بهداشتی ایران
Iran J Health Sci
Medical Sciences
http://jhs.mazums.ac.ir
1
admin
2322-553X
2322-4797
10.29252/jhs
en
jalali
1396
5
1
gregorian
2017
8
1
5
3
online
1
fulltext
fa
Investigation of Fluoride Adsorption from Aaqueous Solutions by Modified Eucalyptus Leaves: Isotherm and Kinetic and Thermodynamic Studies
بهداشت محیط زیست
Environmental Health
پژوهشي
Original Article
<div style="text-align: justify;"><strong><em>Background and purpose</em></strong><strong>:</strong> The World Health Organization (WHO) has specified the tolerance limit of fluoride content of drinking water to be 1.5 mg/L, since excessive intake of fluoride leads to various detrimental diseases. The present study assessed the adsorption effectiveness of HCl-modified eucalyptus leaves in fluoride removal from synthetic solutions.<br>
<strong><em>Materials</em></strong> <strong><em>and</em></strong> <strong><em>Methods</em></strong><strong>:</strong> In this experimental study, pseudo-first and pseudo-second order kinetics, Langmuir and Freundlich isotherm models, as well as pH (2-12), initial concentration (5-30 mg/L), adsorbent dose (0.1-1 g/L), and temperature (25-45 <sup>0</sup>C) were investigated on defluoridation.<br>
<strong><em>Results</em></strong><strong>:</strong> The results with the maximum removal efficiency of 90% was obtained in pH = 10, initial concentration = 5 mg/L, and adsorbent dose = 0.1 g/L. In the investigation of the effect of temperature on removal rates, the maximum removal of fluoride was observed to be in 45 <sup>0</sup>C. The removal efficiency also decreased while the adsorbent dose increased, the initial concentration of fluoride increased, and the temperature in the studied ranges decreased. It was also found that the adsorption equilibrium and kinetic data were in good agreement with Langmuir Model (R2=0.994) with qmax= 61.35 mg/g and pseudo-second order reaction (R2=0.999).<br>
<strong><em>Conclusion</em></strong><strong>:</strong> On the basis of the obtained results, HCl-modified eucalyptus leaves were found to be able to remove fluoride from aqueous environments with good removal efficiency and adsorption capacity.<br>
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</div>
Adsorption, Fluoride Removal, Eucalyptus
65
77
http://jhs.mazums.ac.ir/browse.php?a_code=A-10-590-2&slc_lang=fa&sid=1
Maryam
Faraji
10031947532846004622
10031947532846004622
Yes
Department of Environmental Health Engineering, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
Edris
Bazrafshan
10031947532846004623
10031947532846004623
No
Health Promotion Research Center, Zahedan University of Medical Sciences, Zahedan, Iran
Mohammad
Almasian
10031947532846004624
10031947532846004624
No
School of Medicine, Lorestan University of Medical Sciences, Khorramabad, Iran
Nahid
Khoshnamvand
Nahidkhoshnam92@gmail.com
10031947532846004625
10031947532846004625
No
Environmental Health Researcher Lecturer, Department of Environmental Health Engineering, Lorestan University of Medical Sciences, Khorramabad, Iran