Adsorption and Photocatalytic Decomposition of the 𝛽-Blocker Metoprolol in Aqueous Titanium Dioxide Suspensions: Kinetics, Intermediates, and Degradation Pathways

Table 3

Intermediates proposed for the photocatalytic degradation of MET.

Detected compound (DP)	Ret. time; (min)	𝑚/𝑧 (Da)	Molecular formula	Proposed structure
Metoprolol	3.24	268	C15H25NO3
1	2.59	74	C4H11N
2	3.24	76	C3H9NO
3	2.59	92	C3H9NO2
4	2.59	102	C5H11NO
5	2.59	116	C6H13NO
6	3.24	118	C6H15NO
7	2.59	120	C5H125NO2
8	2.59	134	C6H15NO2
9	3.23	161	C11H12O
10	3.23	193	C12H16O2
11	3.24	208	C12H17NO2
12	3.03	220	C13H17NO2
13	3.03	226	C12H19NO3
14	4.71	238	C13H19NO3
15	3.23	240	C13H21NO3
16	3.98	300	C15H25NO5
17	3.98	316	C13H25NO6
18	3.23	332	C13H19NO7