1. Introduction
Oil spill is one of the most serious accidents that have been destroying our ecosystem, for example, the explosion of a British Petroleum (BP) drilling rig in the Gulf of Mexico and the Exxon Valdez incident in Alaska [1,2]. It is preferred that oil can be removed completely from water for recovery and environment protection. Current methods (booms and skimmers, dispersants, and burning) are not so effective to achieve this objective and expensive. Besides these methods, sorbents are considered as the most rapidandeffective technique for oil spill cleaning. Sorbents for oil removal can be classified as inorganic mineral, synthetic organic, and natural organic materials. However, high cost, low sorption capacity, and low decomposition after usage are main drawbacks of this technique [1–10]. Therefore, it is necessary to invent novel
renewable, sustainable sorbents with low cost and high oil sorption capability.