Renovation and Reuse of Reactive Dyeing Effluent by a Novel Heterogeneous Fenton System Based on Metal Modified PTFE Fibrous Catalyst/H₂O₂

Table 4

Relative unlevelness index (RUI) values of dyed samples.

Dyed samples	Reactive red 195	Reactive yellow 145	Reactive blue 222
Control	0.022	0.030	0.033
First recycle	0.046	0.055	0.052
Second recycle	0.067	0.081	0.070
Third recycle	0.091	0.099	0.102
Fourth recycle	0.137	0.158	0.149

RUI values: <0.2 (excellent levelness), 0.2–0.49 (good levelness), 0.5–1.0 (poor levelness ), and >1.0 (bad levelness) [2].