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Table 2

The pseudo first-order removal rate constant (k) and linear coefficient (R²) of sulfonamides in the UV/TiO₂ system

	pH 5		pH 7		pH 9
Conc.	k (min⁻¹)	R²	k (min⁻¹)	R²	k (min⁻¹)	R²
SMX	0.026 (0.011)^a	0.990 (0.990)^a	0.024	0.988	0.012	0.979
SFZ	0.021 (0.010)^a	0.994 (0.991)^a	0.017	0.983	0.013	0.995
SDZ	0.029 (0.011)^a	0.977 (0.995)^a	0.020	0.996	0.005	0.991
STZ	0.028 (0.011)^a	0.985 (0.978)^a	0.019	0.983	0.007	0.992
TOC
SMX	0.015 (0.009)^a	0.988 (0.983)^a	0.004	0.994	–	–
SFZ	0.009 (0.007)^a	0.997 (0.992)^a	0.005	0.969	–	–
SDZ	0.012 (0.007)^a	0.976 (0.983)^a	0.004	0.962	–	–
STZ	0.011 (0.008)^a	0.996 (0.992)^a	0.003	0.986	–	–

	pH 5		pH 7		pH 9
Conc.	k (min⁻¹)	R²	k (min⁻¹)	R²	k (min⁻¹)	R²
SMX	0.026 (0.011)^a	0.990 (0.990)^a	0.024	0.988	0.012	0.979
SFZ	0.021 (0.010)^a	0.994 (0.991)^a	0.017	0.983	0.013	0.995
SDZ	0.029 (0.011)^a	0.977 (0.995)^a	0.020	0.996	0.005	0.991
STZ	0.028 (0.011)^a	0.985 (0.978)^a	0.019	0.983	0.007	0.992
TOC
SMX	0.015 (0.009)^a	0.988 (0.983)^a	0.004	0.994	–	–
SFZ	0.009 (0.007)^a	0.997 (0.992)^a	0.005	0.969	–	–
SDZ	0.012 (0.007)^a	0.976 (0.983)^a	0.004	0.962	–	–
STZ	0.011 (0.008)^a	0.996 (0.992)^a	0.003	0.986	–	–

^a: with 3.5% NaCl.