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Biosorption of fluoride by apple pulp from aqueous solution
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Mansur Zarrabi   , Mohammad Noori Sepehr , Mohsen Amrollahi , Mahmoud Taghavi |
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Abstract: (5697 Views) |
| Introduction: Fluoride is an essential element at low
concentrations in drinking water. On the other hands, excessive levels of
fluoride can cause a number of problems such as dental fluorosis and skeletal
fluorosis. Therefore, this study was carried out with the aim of application of
apple pulp in order to fluoride removal from aqueous solutions. Materials and Methods: Apple pulp was modified with H2O2 (30 %wt) and were tested
for fluoride removal. In batch experiments, effect of various parameters such
as pH (2-10), adsorbent mass (2-10 g/L), initial fluoride concentration (5-20
mg/L) and contact time (1-120 min) were studied. In addition, experimental data
were fitted to Langmuir and Freundlich isotherms. Results: Fluoride
removal at optimum conditions was 86.7% and 89% for natural and H2O2-modified
apple pulp, respectively. Maximum removal (92 and 95.4 for natural and
H2O2-modified apple pulp) achieved at adsorbent dosage of 10 g/L. From the
results of various kinetic models, pseudo-second-order model best describe the
fluoride adsorption by natural and H2O2-modified apple pulp (R2= 0.992 and
0.998 respectively). The experimental adsorption data complied with Langmuir
isotherm. Conclusion: Modification of natural apple pulp with H2O2
improved the removal efficiency. Apple pulp could be employed as an effective
adsorbent for the removal of fluoride ions from aqueous solutions |
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| Keywords: Fluoride, Adsorption |
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Full-Text [PDF 634 kb]
(1699 Downloads)
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Type of Study: Research |
Subject:
General
Received: 2013/10/11 | Accepted: 2014/09/22 | Published: 2014/12/14
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