**4. Conclusions**

This paper reported the fabrication of a low density (0.084 g/cm3) and highly porous (94.5%) green aerogel for the cleaning of oil and organic solvents from micron-size white bamboo fibrils (MWBF) with a very simple alkaline/ urea mixture solution method followed by a common freeze-drying process. FT-IR and EDX characterization were used to examine the surface morphology and chemical compositions of the silane-modified cellulose aerogel. The coating with MEMO silane for oil absorption purposes made the cellulose aerogel highly hydrophobic with water contact angles larger than 132.3 ± 6.92◦ and exhibited high absorption capacities of 1091 ± 19.6%, 1237 ± 17.6%, and 1247 ± 21.1% by weight gain for waste motor oil, diesel, and gasoline, respectively. Based on these results, the modified aerogels can be used to clean up oil spills and toxic chemicals in aquatic environments with the recyclability over 10 times.

**Author Contributions:** Conceptualization: D.D.N.; methodology: C.M.V.; validation: H.V.T.; formal analysis: C.M.V. and H.J.C.; investigation: C.M.V.; data curation: C.M.V. and D.D.N.; writing—original draft preparation: C.M.V. and H.J.C.; writing—review and editing: C.M.V. and H.J.C.

**Funding:** This research was funded by the Vietnam National Foundation for Science and Technology Development (NAFOSTED) under grant number 104.02-2017.15 (For Cuong Manh Vu) and HJC was partially supported by the National Research Foundation, Korea (2018R1A4A1025169).

**Conflicts of Interest:** The authors declare no conflict of interest.
