Figure 3.
SEM images of raw (a), alkali (NaOH) (b) acid (H2SO4) (c) and acid (HCl) (d) pretreatment, at the concentration of 20 g/100 gTS, respectively.
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.