Photodegradation of Polyphenols and Aromatic Amines in Olive Mill Effluents with Ni Doped C/TiO₂

Table 2

Effect of mass ratios of C/TiO₂/Ni nanocomposites (1%/2%/5%, 5%/1%/2%, and 2%/5%/1%) and increasing retention times on the removals of OMW during photocatalytic degradation, at 500 mg L⁻¹ C/TiO₂/Ni nanocomposite, under 300 W UV and 30 W sunlights, at pH = 7.0, and at 25°C ( = 3, mean values).

Retention time (min)	C/TiO2/Ni	Removal efficiencies (%)
		UV light				Sunlight
		Parameters (mg L^−1)				Parameters (mg L^−1)
		CODtotal	CODdis	Total phenol	TAAs	CODtotal	CODdis	Total phenol	TAAs
15	1%/2%/5%	44	42	38	54	42	39	35	46
	2%/5%/1%	55	53	59	70	54	51	55	68
	5%/1%/2%	50	49	50	52	45	40	44	50
30	1%/2%/5%	49	45	40	56	46	41	37	48
	2%/5%/1%	57	56	61	72	56	54	59	70
	5%/1%/2%	51	50	52	58	47	44	46	55
45	1%/2%/5%	53	51	47	67	50	49	43	64
	2%/5%/1%	72	70	67	88	70	67	64	87
	5%/1%/2%	56	55	58	64	51	53	50	61
60	1%/2%/5%	88	86	82	80	85	83	79	77
	2%/5%/1%	99	99	90	96	96	95	88	91
	5%/1%/2%	90	85	78	82	86	81	75	79
75	1%/2%/5%	86	85	77	78	83	81	74	75
	2%/5%/1%	97	95	86	95	94	93	80	90
	5%/1%/2%	84	81	73	79	81	76	71	74
120	1%/2%/5%	85	82	71	75	82	78	68	70
	2%/5%/1%	94	93	79	92	92	91	75	89
	5%/1%/2%	76	73	66	74	73	67	62	71
180	1%/2%/5%	81	80	67	72	80	75	64	69
	2%/5%/1%	90	89	76	90	89	87	68	88
	5%/1%/2%	74	72	64	71	68	63	59	67