Fate and implication of acetylacetone in photochemical processes for water treatment

Applicability of light sources and the inner filter effect in UV/acetylacetone and UV/H 2 O 2 processes

“…The ϕ values of the UV/AA process were lower than those of the UV/H 2 O 2 process for all four compounds except AO7. This results could be explained by the lower quantum yield of AA (0.116) [23] than that of H 2 O 2 (1.0) [21,24]. However, due to the larger molar extinction coefficient of AA (Fig.…”

“…Its photolysis products improved the biodegradability of the wastewater, which was favor to the bio-treatment [17,23], and decreasing the consumption of electrical energy. The fate of AA is a key point in the UV/AA process, which has been reported in our previous work [23]. AA acted as a sacrificial agent in the photochemical process.…”

“…AA acted as a sacrificial agent in the photochemical process. The main degradation products of AA were small aliphatic acids and aldehydes, which could be utilized by microbes [23]. The addition of AA, without doubt, increased the total organic carbon, and consequently increased the biodegradability of the treated solutions [18].…”

“…Therefore, the determination of the number of photons absorbed by a photo-activator is not only important for the calculation of quantum yield or ϕ, but also crucial for the evaluation of the inner filter effect [12,14,[21][22][23].…”

“…In contrast, for the UV/H 2 O 2 and UV/AA processes, the k corr /k w/o values were all less than 1. The negative effect in the UV/H 2 O 2 process could be attributed to the scavenging effect of the SWCNT-OH on • OH [23]. Direct energy or electron transfer was considered to be the main mechanism in the UV/AA process [18].…”