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Table 1

Removal efficiency of methyl orange by other activated PS systems

Organic contaminants (concentration)	Activation method	Conditions	Removal efficiency	References
Methyl orange (15 μM)	UV	UV₂₅₄, P = 9 W, PS = 630 μM, pH = 3	100%/10 min	Frontistis et al. (2015)
Methyl orange (0.06 mM)	Copper tailings (CT)	CT = 2 g/L, PS = 3 mM, pH = 6.18	96.5%/60 min	Wang et al. (2020a)
Methyl orange (0.3 mM)	Zn⁰	Zn⁰ = 1.3 g/L, PS = 0.3 mM, pH = 5.0	90%/180 min	Li et al. (2014)
Methyl orange (0.1 mM)	FeS₂	FeS₂ = 1.6 g/L, PS = 1.0 mM, pH = 6.08	92.9%/150 min	This study

Organic contaminants (concentration)	Activation method	Conditions	Removal efficiency	References
Methyl orange (15 μM)	UV	UV₂₅₄, P = 9 W, PS = 630 μM, pH = 3	100%/10 min	Frontistis et al. (2015)
Methyl orange (0.06 mM)	Copper tailings (CT)	CT = 2 g/L, PS = 3 mM, pH = 6.18	96.5%/60 min	Wang et al. (2020a)
Methyl orange (0.3 mM)	Zn⁰	Zn⁰ = 1.3 g/L, PS = 0.3 mM, pH = 5.0	90%/180 min	Li et al. (2014)
Methyl orange (0.1 mM)	FeS₂	FeS₂ = 1.6 g/L, PS = 1.0 mM, pH = 6.08	92.9%/150 min	This study