Title : Sustainable biosorption of binary metals ions (antimony and manganese) aqueous solution using tea leaves and tea fiber (camellia sinensis): A Green chemistry, kinetic, thermodynamic and isotherm studies for wastewater remediation
Abstract:
Ecosystems and human health are seriously threatened by the release of industrial effluents into the environment that contain heavy metals including manganese (Mn) and antimony (Sb). Using readily available tea leaves and tea fibers as affordable, environmentally acceptable biosorbents, this work explores the sustainable biosorption of binary metal ions, manganese and antimony, from aqueous solutions. The surface functional group of tea leaves, and tea fibers was examined using Fourier Transform Infrared Spectroscopy. The FTIR results of tea leaves exhibit N-H at 3697.5 cm-1 indicating the presence of primary amine; O-H band at 3615.6 cm-1 corresponding to alcohol, carbohydrate, proteins and phenols. The FTIR results of tea fiber exhibit O-H stretch band at 3276.3 cm-1 corresponding to alcohol, carbohydrate, proteins and phenols; C-H band at 2918.5 cm-1 indicating an Alkane; a –C=O band at 1625.1 cm-1 correspond to the amide; while a C-O band at 1144.2 cm-1 correspond to secondary alcohol and C-O band at 1017.6 indicates an ether or/and primary alcohol. To determine the optimal conditions for the removal of antimony from aqueous medium, an adsorption study was conducted using the batch adsorption method, adjusting various parameters such as pH, adsorbent dosage, temperature, starting concentration, and contact time. For tea leaves and tea fiber, the regression correlation coefficients according to the Langmuir model were 0.1636 for Sb and 0.6747 for Mn. These results imply that tea leaves, and tea fibers are efficient biosorbents for removing Mn (II) and Sb (II) from wastewater samples.
