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Archives of Hygiene Sciences، جلد ۶، شماره ۱، صفحات ۳۲-۳۸
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عنوان انگلیسی Optimization of Continuous Flow Adsorption of Heavy Metal Ions on Continuous System Column by Peganum Harmala Seeds
چکیده انگلیسی مقاله Background & Aims of the Study: Heavy metals discharge to environment is a worldwide problem growing in scale. When they accumulate in the environment and in food chains, they can profoundly disrupt biological processes. Peganum Harmala Seeds (PHS) was used as a bio-sorbent, using a continuous system for removing Pb2+, Co2+, Ni2+ and Cu2+ ions from aqueous solutions. Materials and Methods: PHS was used as adsorbent in adsorption of heavy metals from aqueous solutions. A stock solution of Pb(II), Co(II), Cu (II) and Ni (II) was prepared and experiments were down in a column as a reactor. The concentration was determined by atomic adsorption spectroscopy. The effect of various parameters such as pH, contact time, heavy metal concentration, ionic strength, particle size and adsorbent dosage on the process was investigated. Langmuir, Frundlich and Temkin isotherms were studied to evaluate of adsorption isotherms. Results: The adsorption efficiency was found to be pH dependent and enhanced by increasing the solution pH. Maximum removal of ions were obtained at pH=4-8. The equilibrium time was attained after 30 min and desorption studies were performed, using diluted HNO3, H2SO4 and HCl solution (1M) on adsorbed metal ions from PHS. Results illustrated that adsorbed metal ions could be recovered under acidic conditions. Investigation of the process kinetic was best fitted with pseudo second-order model. Langmuir, Freundlich and Temkin models were tested for describing the equilibrium data. The Langmuir isotherm illustrated the best description of the cobalt and copper adsorption mechanism and Freundlich model describes lead and nickel ions adsorption on PHS. Conclusion: It was found that PHS would be a good adsorbent for removal of heavy metals.
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نویسندگان مقاله الهامه محمدپور | elhameh mohammadpour
phase equilibria research lab., department of chemistry, faculty of science, university of zanjan, zanjan, iran

سازمان اصلی تایید شده: دانشگاه زنجان (Zanjan university)

محمدرضا یافتیان | mohammad reza yaftian
envirnmental science research lab., department of environmental science, faculty of science, university of zanjan, zanjan, iran

سازمان اصلی تایید شده: دانشگاه زنجان (Zanjan university)

عباسعلی زمانی | abasali zamani
envirnmental science research lab., department of environmental science, faculty of science, university of zanjan, zanjan, iran

سازمان اصلی تایید شده: دانشگاه زنجان (Zanjan university)

پروین غربانی | parvin gharbani
department of chemistry, ahar branch, islamic azad university, ahar, iran

سازمان اصلی تایید شده: دانشگاه آزاد اسلامی علوم و تحقیقات (Islamic azad university science and research branch)

نشانی اینترنتی http://jhygiene.muq.ac.ir/browse.php?a_code=A-10-34-1&slc_lang=en&sid=en
فایل مقاله اشکال در دسترسی به فایل - ./files/site1/rds_journals/251/article-251-331356.pdf
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زبان مقاله منتشر شده en
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نوع مقاله منتشر شده 1
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