Study on Removal of Heavy Metal Ions (Pb2+, Cd2+ and Cu2+) by Coriandrum sativum (Coriander)

Abstract

The removal of metallic trace elements from our environment especially in wastewater is now shifting from the use of conventional adsorbents to the use of biosorbents materials which have a big potential application in environmental control and metal recovery operations. It can be considered as an alternative green technology which has been proved as more efficient and economical for metallic trace elements. In this work, we propose to test the ability of Coriandrum sativum (Coriander) seeds in the elimination of metallic trace elements (Pb2+, Cd2+, and Cu2+) in water. This study was carried out by electrochemical (differential pulse polarography) and spectroscopic characterization (fourier-transform infrared, FTIR). The Coriandrum sativum seeds are powdered and added with different weight (0.1, 0.2, 0.4, 1, and 2 g) to different solutions containing Pb2+, Cd2+, or Cu2+ (20 ppm), after filtration with filter paper, all solutions were analyzed by differential pulse polarography technic (DPP) with a dropping mercury electrode (HMDE). The obtained results had shown a significant ability in removing, which achieved a removal efficiency of the 98.05% of Pb2+, 98.1% of Cd2+ and 87% of Cu2+ at 2 g of optimal mass of Coriandrum sativum powder. The obtained results indicate that the Coriandrum sativum is a good support for elimination of toxic metals. The metallic trace elements Pb2+, Cd2+, and Cu2+ are mainly interacted by the chelation between metallic ions and the carboxylate anion as the conjugate base of a carboxylic acid in Coriandrum sativum particles.