Photocatalytic Oxidation of Organic Acids on Quantum-Sized Semiconductor Colloids

Photocatalytic paper using zinc oxide nanorods

“…The photocatalytic degradation of MO is also exponential, as reported in [26,27]. Our observations of the degradation of MO using the photocatalytic paper could be fitted with equation (3), and the degradation rate constants were calculated using equation (4).…”

“…Zinc oxide (ZnO), with its high surface reactivity owing to its large number of active surface defect states, has emerged as a more efficient photocatalyst than TiO 2 . It has high reaction and mineralization rates [3] because of its more efficient hydroxyl ion generation [4]. ZnO can be structurally modified for visible light absorption paving the way for visible-light photocatalytic activity [5].…”

“…Pozzo et al [7] have also discussed the importance of catalyst supports and opined that there is an inverse relationship between the adhesion of a catalyst to a support and its photocatalytic activity. There are only a few reports (including patents) on the use of paper as a catalyst support [1,4,8,9].…”

Sorption Behavior of Dye Compounds onto Natural Sediment of Qinghe River

“…Environment researchers have paid special attention to dye compounds because of the extensive environmental contamination arising from dyeing operations. Most studies have focused on the development of a treatment technique and method for dye wastewater, such as a physical-chemical technique destroying the color groups (30,31), a biodegradation process mineralizing the colorless organic intermediates (32,33), and chemical oxidation including homogeneous oxidation (34) and heterogeneous photocatalytic oxidation (35)(36)(37). However, because of its higher organic concentration, particular toxicity, complex composition, and poor degradability, dye wastewater cannot be efficiently purified and treated.…”

Semiconductors in Organic Photosynthesis

“…On illuminated TiO 2 surfaces, in the presence of air (O 2 ), hydrogen peroxide and reactive oxygen-centred radical species are formed via oxygen reduction (Karraway, 1994& Kormann, 1988. The first step of O 2 action consists in the capture of the electron promoted in the CB by light irradiation of semiconductor surface (Eq.…”