| Summary: | 碩士 === 國立中山大學 === 環境工程研究所 === 107 === 4.62 million metric tons of agricultural waste are being produced annually in Taiwan. Hence, the necessity for an effective and environment – friendly utilization of these waste is essential. In this study, rice straw waste was utilized as a precursor to synthesize aerogel by freeze-thaw method using ionic liquid (ILs)/ dimethyl sulfoxide (DMSO) as solvent. A simple modification method using stearic acid (SA) solution coating treatment was also implemented for the improvement of hydrophilic and lipophilic properties of the synthesized aerogel. The properties and characteristics of the synthesized aerogel were determined using scanning electron microscopy (SEM), fourier transform infrared spectroscopy (FT-IR), contact angle measurement (WCA) and adsorption test. Results show that the contact angle of synthesized aerogel is 44.3°, which is relatively higher compared to the rice straw waste with 18.0°. The SA coated aerogel reached 121.4°, which exhibited an increased in hydrophilic effect. This emphasized its good hydrophobic stability, excellent adsorption selectivity for oil contaminants in water and improved decontamination effect. Moreover, the adsorption amount of various oils and organic solvents can reach up to 7-10 times of its own weight, proving its strong adsorption force, excellent recyclability and durability. Therefore, the synthesized aerogel demonstrated a high potentiality as organic solvents substitute and the utilization of rice straw waste promotes innovative approach in converting agricultural waste into high value products.
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