As the recycled cellulose aerogels developed in Part 2.2 are
hydrophilic, the as-prepared cellulose aerogels are coated with
MTMS on their highly porous networks [29,35,36] to form the
super-hydrophobic cellulose aerogels for the oil absorption. The
cellulose aerogel sample and an open glass vial containing MTMS
are placed in a big container. The container is then capped and
heated at 70 C for 3 h for the silanation reaction [33]. After the
aerogel structure is coated completely, excessive MTMS is removed
by placing the aerogel sample in a vacuum oven until the pressure
goes down below 0.03 mbar.