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Waste Fruit Cortexes for the Removal of Heavy Metals from Water

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Green Adsorbents to Remove Metals, Dyes and Boron from Polluted Water

Abstract

In the recent years, contaminants of emerging concerns took the scientific community by a storm with one of the main issues being water security. Wastewater from the industries has been found to contaminate our water sources with heavy metals. Waste fruit cortexes made up of cellulose, hemicellulose, pectin, and lignin contain numerous hydroxyl and carboxyl bonds that are mandatory in the removal of heavy metals in water. This chapter highlights the various types of fruit cortexes that are available as a biosorbent for heavy metal removal from water.

Some of the commonly studied fruits were banana, orange, and mango, among which the various citrus peels showed highest adsorption capacity for most metals. Complexation and ion exchange are the commonly suggested mechanism for biosorption of heavy metals from water. Other than that, various factors were found to affect the uptake of metallic ions by waste fruit cortexes. The best pH reported for maximum biosorption were between 2 and 6.0. At this pH, it was found that there is no interference for the adsorption of metallic cations by the fruit cortex. Lower initial metal ion concentration and higher biosorbent dosage help in achieving maximum adsorption capacity of waste fruit cortexes. Pseudo-second-order kinetics and intraparticle diffusion models explain the kinetics of the biosorption. Hence, the use of waste fruit cortexes is highly recommended as biosorbent in heavy metal removal from water sources.

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Correspondence to Shangeetha Ganesan .

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Ganesan, S. (2021). Waste Fruit Cortexes for the Removal of Heavy Metals from Water. In: Inamuddin, Ahamed, M., Lichtfouse, E., Asiri, A. (eds) Green Adsorbents to Remove Metals, Dyes and Boron from Polluted Water. Environmental Chemistry for a Sustainable World, vol 49. Springer, Cham. https://doi.org/10.1007/978-3-030-47400-3_13

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