Document Type : Research Paper

Abstract

  Nowadays, heavy metals have become one of the most important problems in the environmental pollution. Heavy metals are non-degradable in the environment and can be harmful to a variety of living species. For this purpose, the removal of these metals from waters and wastewaters is very important. Various physical and chemical methods are for removing heavy metals. In this study, lotus leaves in the form of dry coal and powder was used to remove Pb ions from aqueous solution. To do so, effect of different parameters such as initial pH of solution, concentration of adsorbent, contact time, agitation speed and the concentration of Pb ions were studied in ambient temperature. The results showed the best efficiency to adsorb of Pb ions by this adsorbent is determined 98.78 % obtaining at pH, the concentration of adsorbent, agitation speed, initial concentration of Pb ion and contact time 9, 5 g/lit, 100 rpm, 20 ppm and 130 min, respectively. To study the kinetic behavior of adsorbent, two equations such as first order and second order pseudo kinematic models were used and results showed that second order pseudo kinematic model had more ability to describe the experimental data. According to the results, we can say that this adsorbent is proper to remove Pb ions from aqueous solution.

Keywords

• Bioadsorbent
• Lotus
• biosorption
• Aqueous solution
• Lead ion