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

Table 3

Color differences of three dyed fabrics with respect to control samples.

Dyes	Numbers of; recycling processes	DE*	DL*	Da*	Db*	DC*	DH*
RR 195	First	0.475	0.343	0.121	−0.306	0.078	−0.320
	Second	0.525	−0.182	−0.263	0.417	−0.205	0.448
	Third	0.863	−0.584	−0.012	0.635	0.074	0.631
	Fourth	1.301	−0.551	−0.265	1.148	−0.102	1.174
RY 145	First	0.112	−0.039	0.103	0.018	0.062	−0.084
	Second	0.213	−0.034	−0.007	0.210	0.188	0.094
	Third	0.681	−0.046	−0.101	−0.672	−0.653	−0.188
	Fourth	0.680	−0.265	0.608	0.151	0.411	−0.473
RB 222	First	0.241	−0.216	−0.108	−0.007	0.028	−0.105
	Second	0.583	−0.497	0.04	0.303	−0.305	−0.022
	Third	0.963	−0.879	0.106	0.379	−0.393	0.033
	Fourth	0.995	−0.954	0.002	0.285	−0.280	−0.053

The control samples were regarded as the references.