Removal of Orange 7 Dye from Wastewater Used by Natural Adsorbent of Moringa Oleifera Seeds

Removal of Orange 7 from wastewater using natural adsorbent of Moringa Oleifera seeds were investigated. The effects of some operational parameters such as pH, the amount of biosorbent, initial dye concentration and temperature were examined. The present study revealed optimum conditions for the removal process which included dose of biosorbent (0.4 g), initial dye concentration (20 mg/L), initial pH (6) and temperature (25°C). The Langmuir and Freundich isotherms were applied for describing the biosorption equilibrium. The process was represented by the Freundich isotherm with a correlation coefficient of 0.94. The first-order, second-order and intra-particle diffusion kinetic models were implemented for demonstrating the biosorption mechanism and, as a result, intra-particle diffusion kinetics fitted best to the experimental data.