Table 5. Order and kinetics of dye degradation with NaBH₄ as a co-catalyst.

Order	Catalyst	Co-catalyst	Dyes	Rate constant (k)	References
Pseudo zero order	Iron nanoparticles	NaBH4	Methylene blue	0.088	69
	Iron nanoparticles	NaBH4	Crystal violet	0.084	69
Pseudo first order	Iron nanoparticles	NaBH4	Methylene blue	0.051	69
	Silver nanoparticles			0.0304 s−1	125
	Silver nanoparticles			0.3378 min−1	104
	Iron nanoparticles	NaBH4	Crystal violet	0.041	69
	Silver nanoparticles	NaBH4	Bromocresol green		113
	Silver nanoparticles	NaBH4	Rhodamine B	0.0127 s−1	125
	Silver nanoparticles	NaBH4	Methyl orange	0.0179 s−1	125
	Silver nanoparticles	NaBH4	Congo red	0.0051 s−1	125
Pseudo second order	Iron nanoparticles	NaBH4	Methylene blue	0.033	69
	Iron nanoparticles	NaBH4	Crystal violet	0.021	69