Application of a Novel Semiconductor Catalyst, CT, in Degradation of Aromatic Pollutants in Wastewater: Phenol and Catechol

Table 3

Levels of TOC calculated from carbon contents in phenol and its intermediates compared with TOC concentrations measured by a TOC analyzer.

TOC (mg L^−1)	Time (day)
	0	2	4	6	10
UV + CT
Phenol	67.4	49.0	42.6	29.3	ND
Catechol	ND	0.541	ND	ND	ND
Hydroquinone	ND	2.90	1.69	2.07	ND
Benzoquinone	ND	ND	0.125	0.683	ND
Total calculated value	67.4	52.4	44.4	32.0	ND
Measured value	54.3	50.5	43.2	36.3	0.206
UV + TiO2
Phenol	67.4	46.7	46.7	44.2	36.7
Catechol	ND	1.40	1.63	1.78	1.72
Hydroquinone	ND	2.14	2.45	2.53	2.73
Total calculated value	67.4	50.3	50.8	48.5	41.1
Measured value	54.3	50.5	46.7	47.1	37.3

ND: undetectable; method detection limits (MDLs) of phenol, catechol, hydroquinone and benzoquinone were 0.0158, 0.0240, 0.0124 and 0.0190 mg C L⁻¹, respectively.