Repository of Research and Investigative Information

Repository of Research and Investigative Information

Torbat Heydariyeh University of Medical Sciences

Removal of hexavalent chromium from aqueous solutions using Azolla plant leaf

(2017) Removal of hexavalent chromium from aqueous solutions using Azolla plant leaf. Journal of Global Pharma Technology. pp. 33-39. ISSN 09758542

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Abstract

Soluble hexavalent chromium Cr is one of the most important and most dangerous toxic and carcinogenic heavy metals. This metal in accordance with health organizations has been classified as one of six probably carcinogenic agents through ingestion. This study was conducted to evaluate the level of removal of hexavalent chromium from aqueous solutions using Azolla plant leaf. In this experimental study, the effect of influencing variables was analyzed, including pH (2, 3, 5, 7, 8, 10 and 12), contact time (5 to 120 minutes), adsorbent dosage (0.1, 0.3, 0.5, 0.7, 0.9, 1 and 1.5 g/l) and initial phenol concentration (10-200 mg). Adsorption isotherms were studied using Langmuir, Freundlich and Temkin isotherms. The results showed that acid- heat- modified Azolla plant leaf had greater potential for absorption of chromium in comparison with washed with distilled water or unmodified conditions, so that the absorption rate was about 53 in pH 2 with an hour contact time. Also according to the results, the absorption rate in pH 2 was greater than in pH 4. Therefore, Azolla plant leaf compared with some adsorbents investigated so far is considered as an effective, suitable and inexpensive adsorbent for removal of Cr from aqueous solutions. © 2009-2017, JGPT.

Item Type: Article
Keywords: Hexavalent Chromium, Adsorption, Azolla, Aqueous Solutions, Adsorbent
Page Range: pp. 33-39
Journal or Publication Title: Journal of Global Pharma Technology
Journal Index: Scopus
Volume: 9
Number: 1
Publisher: Journal of Global Pharma Technology
ISSN: 09758542
Depositing User: دکتر محبوبه عبداللهی
URI: http://eprints.thums.ac.ir/id/eprint/277

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