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.
Adsorbed direct orange (DO) and direct blue (DB) on PSCB after 6 h incubation at 70 °C and the ratio between them (accessible cellulose surface)
| Pretreatment | Adsorbed DO (mg/g) | Adsorbed DB (mg/g) | DO/DB |
|---|---|---|---|
| NaOH | 18.35 | 26.41 | 0.69 |
| Na2SO3/NaOH | 24.27 | 21.19 | 1.14 |
| H2SO4 | 17.38 | 24.9 | 0.69 |
| NaHSO3/H2SO4 | 19.84 | 25.43 | 0.78 |
| SO2/steam | 23.92 | 22.65 | 1.05 |
