Adsorptive Removal of Cadmium and Lead from Oryza Sativa Rice by Banana Peel as Bio-Sorbent
Mahdis Motaghi1 and Parisa Ziarati*2
1Pharmaceutical Sciences Research Center, Pharmaceutical Sciences Branch, Islamic Azad University, Tehran-Iran (IAUPS).
2Department of Medicinal Chemistry, Pharmacy Faculty, Pharmaceutical Sciences Branch, Islamic Azad University (IAUPS), Tehran –Iran.
*Corresponding Author E-mail: ziarati.p@iaups.ac.ir
Abstract: Removal of heavy metal ions from contaminated systems by agricultural and fruit and vegetable processing waste materials is an innovative and auspicious technology. The potential of the waste material on adsorbing heavy metals depends on the affinity, capacity and specificity including physico-chemical nature of it. In the current study the utilization of banana peel as food waste materials due to prospective metal bio-sorption capacity to toxic heavy metal ions: Cadmium and Lead from Oryza Sativa rice from Astaneh Ashrafieh, Gilan province in the north of Iran was investigated. The effect of soaking rinsed rice samples by NaCl and modified banana peel adsorbent by different concentration, pH, contact time and percentage of adsorbent and association of cooking methods on Cadmium and Lead contents were studied. Heavy metal contents in raw, rinsed, soaked by adsorbent and cooked and drained rice samples were determined by Atomic Absorption spectrophotometer. The minimum and maximum Cd and Pb contents in rinsing rice and cooked polished Oryza Sativa rice were 0.002 and 0.041 (mg/kg DW) in Iranian rice variety respectively . It was found that cooking rice by soaking rinsed rice samples by NaCl 2% and Banana peel modified by Citric Acid 0.5% at least for 1 hours had the greatest effect (significantly affect p<0.001) with regards to lowering Pb and Cd levels in cooked rice. Specifically, it preferentially reduced the Cadmium content by 93.2 % and Lead content by 83.78% from the raw rice, when combined with rinse washing and being soaked by salt for one hour contact time. Our finding shows high potential metal biosorption capacity of dried banana peel. The results of the current study suggest that banana peel waste modified by citric acid 1% can be used beneficially in treating rice containing heavy metal ions.
Keywords: Removal Heavy Metal; Banana peel; Oryza Sativa rice; Adsorbent Back to TOC