Fig. 13.6 Photocatalytic degradation of studied antibiotics as a function of their chemical oxygen
demand equivalent concentration in the initial solution. Note that there is no noticeable difference in
photocatalytic degradation efficiency for the two concentrations of antibiotics, regardless of the
antibiotic used. The results highlight the photocatalytic potential of the new photocatalytic TiO 2 /
sisal fiber membrane used. COD, chemical oxygen demand at reaction time t; COD 0 , initial
chemical oxygen demand
Fig. 13.7 Comparative photocatalytic degradation of the three types of studied antibiotics. Note
that erythromycin shows a lower rate of degradation than the other two antibiotics studied. The
lower rate of degradation is most likely due to the complex structure and much higher molecular
weight of erythromycin compared to ampicillin and tetracycline. COD, chemical oxygen demand at
reaction time t; COD 0 , initial chemical oxygen demand
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