Unicam helios alpha service manual6/15/2023 Under these conditions, an electron-hole recombination was favored. The degradation rate of MLN increased with radiant flux until an optimum at 580 W m ‑2 was reached and then decreased. Photocatalytic degradation rates increased with TiO 2 dosage, but overdoses did not necessarily increase the photocatalytic efficiency. The k obs values indicated an inverse dependence on the initial herbicide concentration and were fitted to the Langmuir-Hinshelwood equation. Under the operating conditions of this study, the photocatalytic degradation of MLN and LN followed pseudo first-order decay kinetics. A comparative study of the photocatalytic degradation kinetics of both herbicides showed that these two compounds have a comparable reactivity with TiO 2/simulated sun light. The objective of the study was to compare their photocatalytic reactivity and to assess the influence of various parameters such as initial pesticide concentration, catalyst concentration and photonic flux on the photocatalytic degradation rate of MLN and LN. The photocatalytic degradation of two phenylurea herbicides, monolinuron (MLN) and linuron (LN), was investigated in an aqueous suspension of TiO 2 using simulated solar irradiation.
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