Photocatalytic degradation of formaldehyde containing wastewater from veterinarian laboratories

Decomposition of 2-chlorophenol using a tourmaline–photocatalytic system

“…With H 2 O 2 addition up to 10.0 mL/L, the 2-chlorophenol removal by photocatalytic oxidation was 100% after irradiation for 2.5 h. According to the photocatalytic oxidation process, hydroxyl radicals are one of the most important oxidants in the degradation of 2-chlorophenol to carbon dioxide and water. Hydroxyl radicals are derived from H 2 O and OH À , but, if present, H 2 O 2 is a better source [10,11]. Consequently, 2-chlorophenol photodegradation was increased with H 2 O 2 addition.…”

Kinetic Concepts of Heterogeneous Photocatalysis

“…At excessive substrate concentrations, the photonic efficiency would diminish and the semiconductor surface becomes saturated (Arańa et al 2004). For these reasons, photocatalytic processes offer maximum efficiency only when optimum initial concentrations are utilised.…”

Perspectives and Advances in Photocatalysis

“…Two case studies of the photocatalytic destruction of formaline, a formaldehydemethanol-water mixture and formaline wastes from the preservation of vertinarian physiologic samples have been investigated by Araa et al (2004). Similarly, the study showed that at non-optimum conditions, photonic efficiencies were low which was attributed to the formation of methoxy compounds, formates and physisorbed formic acid which may have inhibited formation of hydroxyl radicals and consequently the photocatalytic degradation.…”