Banana peel: a green and economical sorbent for Cr (III) removal

Anal. Environ. Chem 01/2008; 9:20-25.


Banana peel, a common fruit waste has been investigated to remove and preconcentrate Cr(III) from industrial wastewater. It was characterized by FT-IR spectroscopy. The parameters pH, contact time, initial metal ion concentration and temperature were investigated and the maximum sorption was found to be 95%. The binding of metal ions was found to be pH dependent with the optimal sorption occurring at pH 4. The retained species were eluted using 5mL of 2 M HNO 3 . The mechanism for the binding of Cr(III) on the banana peel surface was also studied in detail. The Langmuir and Dubinin-Radushkevich (D-R) isotherms were used to describe the partitioning behavior for the system at different temperatures. Kinetic and thermodynamic measurements of the banana peel for chromium ions were also studied. The method was applied for the removal and preconcentration of Cr(III) from industrial wastewater. Chromium is the common contaminant in wastewater from electroplating, leather tanning and metal-finishing plants. The physiological effects of chromium on the biological system depend upon its oxidation state i.e. Cr(III) and Cr(VI). Cr(III) may be considered as an essential trace element for the proper functioning of living organisms (mammals) e.g. for the maintenance of "glucose tolerance factor"; it is thought to be a cofactor for the insulin action and to have a role in the peripheral activity of this hormone. The toxicity of metal ions comes to play when their concentration values exceed than the threshold value. Chromium is toxic, corrosive and irritant. The maximum allowable limit for total chromium in drinking water as recommended by the World Health Organization (WHO) is 0.05 mg L -1 [1]. The conventional chromium treatment method consists of following three steps.

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Available from: Saima Memon,
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    • "Since both of these agricultural products are greatly consumed, significant amount banana peelings and rice husks are generated as solid wastes every day. Because of their availability and abundance, and inherent chemical characteristics, both banana peelings and rice husks are widely studied for their potential to adsorb a wide variety of chemical species, from various heavy metals (Kaewsarn et al 2008; Memon et al 2008; Asrari et al 2010), to some organic compounds (Achak et al 2009; Abdelwahab et al 2005). This study investigates the potential of common lignocellulosic wastes for the removal of ubiquitous environmental water pollutants. "

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    • "Nowadays, agricultural materials are receiving more and more attention as adsorbents for the removal of pollution from water (Anwar et al. 2010). A recent study by Memon et al., (2008) showed that banana waste material removed about 95% chromium ions from industrial effluent. Mas et al. (2010) "

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    • "For Banana peel preparation, Slices of banana peels were cut into small pieces and were washed thoroughly with de-ionized water to remove physically adsorbed contamination, and then oven dried at 100 0 Cfor a period of 8 hours. The dried peels was ground and sieved through 4000 µm sieve ( Memon, ea al. 2008) and kept in desiccators for further study. In one liter flask a suitable amount of the deride peel was conditioned by mixing with distilled water, then water decanted and the solution was transferred on small batches to a (18 cm) separation column. "
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    ABSTRACT: Banana peel which consider as fruit waste has been tested for the removal of total sulfide from spring water in Heet area, Iraq. The chemical composition of peels was investigated. The results show that the composition consists of Sodium ,Potassium, Calcium ,Manganese and Phosphate and concentrations of these contents were 18.2mg/g, 62mg/g,15.4mg/g ,48mg/g and 0.37 mg/g , respectively. The alkalinity of peels was 5.2 mg/g and the moisture content was 5.8 % . The treatment efficiency was studied as a function of the retention time and concentration of sulfide ion .The maximum sorption for sulfide was found to be 97% and it was nearly effective as activated carbon. As a result of the removal process , the concentrations of some common anions ,cations and heavy metals (Mg+2,Ca+2,Na+,So4-2,cl-Po4-2, Cr, Fe, Ni, Cu and Zn) decreased ,the concentrations of K+ and Mn increased . Increasing of concentrations of K+ and Mn is attributed to their high content in the banana peels. A slight increase in pH of the treated water (6.5 – 7.5). This study revealed that the treatment of water using the banana peel is most effective for removal of hydrogen sulfide from sulfur spring water. Keywords: Sulfide removal, banana peel, sorbent, peel mineral content ,sulfur, spring water
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