Hydrolysis time (h)

Decolorization rate (%)

3 min

6 min

9 min

12 min

15 min

18 min

0.5

75.7

92.7

97.9

98.2

99.9

99.9

1.0

54.6

89.7

94.9

97.2

98.7

98.7

2.0

80.2

93.6

98.0

99.1

99.6

99.6

4.0

84.5

93.9

98.6

99.1

100

100