with kobs treated as the pseudo-first-order reaction rate constant (kobs ¼ k COH, where k is the second-order reaction rate constant between the solute and OH radicals). However, this interpretation requires the assumption that the reaction is homogeneous, which is doubtful since OH radicals exist only in the immediate vicinity of the plasma channel (the interfacial zone). Thus, the solute degradation will likely only occur in the interfacial zone rather than within the bulk liquid. While RhB is photosensitive, it is not expected that photodegradation occurs to any significant degree, due to the relative lack of emissions in the range of wavelengths in which RhB absorbs (450–600 nm) [7]. Considering the non-homogeneous nature of this system, a more suitable kinetic model would be that for a heterogeneous irreversible pseudo-first-order reaction [16]:
with kobs treated as the pseudo-first-order reaction rate constant (kobs ¼ k COH, where k is the second-order reaction rate constant between the solute and OH radicals). However, this interpretation requires the assumption that the reaction is homogeneous, which is doubtful since OH radicals exist only in the immediate vicinity of the plasma channel (the interfacial zone). Thus, the solute degradation will likely only occur in the interfacial zone rather than within the bulk liquid. While RhB is photosensitive, it is not expected that photodegradation occurs to any significant degree, due to the relative lack of emissions in the range of wavelengths in which RhB absorbs (450–600 nm) [7]. Considering the non-homogeneous nature of this system, a more suitable kinetic model would be that for a heterogeneous irreversible pseudo-first-order reaction [16]:
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