Nano particle

Amount of catalyst/20ml

k・sec−1

Time taken for complete degradation (min)

COD values in mg/L

Degradation efficiency %

Before degradation

After degradation

Commercial ZnS

0.02 g

1.5 × 10−4

92

352

288

18.18

Zinc sulphide

0.02 g

14.04 × 10−4

22

352

16

95.45

0.04 g

17.13 × 10−4

22

352

16

95.45

0.06 g

12.95 × 10−4

22

352

16

95.45

0.02 g

4.93 × 10−5

210

192

32

83.33

0.04 g

7.67 × 10−5

150

192

64

66.66

0.06 g

6.39 × 10−5

130

192

96

50.00