الفهرس 
Chapter One: IntroductionOnly 14 pages are availabe for public view
 |  | from | 152 |  |  |
| | | from | 152 | | |
Abstract
The annual increasing in amounts of waste rubber tires is one of the most important challenges that threaten the safety of the environment. Thus, the main objective of this work is to prepare activated carbons from waste tires using either one or two steps. Phosphoric acid was used for production of activated carbon by one step process where both KOH and NaOH were used for the two steps process (carbonization and chemical activation). Effect of operating parameters, heating time, temperature, rate and impregnation ratio have been studied. Activated carbon produced by one step has a limited sp.surface area ranged from 85 m2/g to 97 m2/g for impregnation ratios 1:1 and 3:1 respectively. The optimum conditions for carbonization step was550 °C for 2 h with a heating rate of 15 °C/min, where yield reaches 40%. KOH is more effective than NaOH for activation step, the sp.surface area was 236 m2/g and 113 m2/g for KOH and NaOH respectively.