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

Table 5

Effect of increasing pH values on the removals of OMW during photocatalytic degradation, at 500 mg L⁻¹ C/TiO₂/Ni nanocomposites, under 300 W UV and 30 W sunlight irradiations, after 60 min, at 25°C ( = 3, mean values).

Parameters (mg L^−1)	Removal efficiencies (%)
	UV light				Sunlight
	pH values				pH values
	3.5	4.0	7.0	10.0	3.5	4.0	7.0	10.0
CODtotal	82	98	99	69	80	95	96	66
CODdissolved	80	97	99	66	77	94	95	62
CODinert	69	71	73	56	68	69	70	53
Total phenol	86	88	90	65	83	84	88	60
Polyphenols
Catechol	81	85	87	58	75	82	84	55
Tyrosol	83	88	89	60	76	84	87	58
Quercetin	85	87	90	59	79	81	88	56
Caffeic acid	80	86	88	62	78	83	86	59
4-Methyl catechol	83	87	89	52	74	81	85	50
2-PHE	81	85	88	63	77	80	82	59
3-PHE	79	84	86	65	80	82	83	58
TAAs	90	93	96	68	86	89	91	62
TAAs metabolites
2,4,6 trimethlyaniline	80	86	88	66	76	83	85	60
Aniline	78	83	86	65	75	81	83	61
o-Toluidine	76	84	85	62	74	80	81	59
o-Anisidine	83	91	93	49	79	88	90	45
Dimethylaniline	85	93	95	50	81	89	91	48
Ethylbenzene	82	90	94	60	78	89	91	57
Durene [3,6-bis(dimethylamino)]	73	78	80	64	70	74	78	62