Heterogeneous Photocatalysis in Environmental Remediation

Abstract

Semiconductor-based photocatalytic processes have been studied for nearly 1.5

Degradation of Phenolic Compounds Through UV and Visible- Light-Driven Photocatalysis: Technical and Economic Aspects

“…The semiconductor material can be activated by photons with sufficient energy equal to or greater than the band gap energy (E g ) between the conduction band and valence band of the material [45]. A photocatalytic reaction initiates with the formation of electron-hole pairs followed by oxidation and reduction reactions [46]. In the presence of hole scavenger, the reduction reactions become predominant, whereas in the presence of electron scavenger, the oxidation reactions are the key reactions.…”

Sm-Doped Tio2 Nanoparticles With High Photocatalytic Activity For ARS Dye Under Visible Light Synthesized By Ultrasonic Assisted Sol-Gel Method

“…Titanium (IV) butoxide (Ti (C 4 H 9 O) 4 ) and samarium (III) nitrate hexahydrate (Sm (NO 3 ) 3 6H 2 O) were obtained from Sigma-Aldrich (USA). Zinc oxide (ZnO), isopropyl alcohol (CH 3 ) 2 CHOH) and Alizarin red S (C.I.…”

Removal of Cr (VI) and Cu (II) Ions from Synthetic Wastewater by Solar Photocatalytic Reactor

“…The reduction strength of photocatalysis has been used to recover expensive metals from industrial effluent, such as gold, platinum and silver [6]. Chen et al [7] reported that the process of removal or recovery of dissolved metal ions in wastewater couples UVlight with particles acting as catalyst and is based on the reduction by the photogenerated of electrons. It is well known that when a semiconductor is photo-exited by ultraviolet light with having energy more than the bandgap energy of the semiconductor, an electron/hole pairs is produced in the semiconductor.…”

“…Reduction by the photo-produced electrons happens simultaneously with oxidation by the photo-produced holes during the photocatalysis. In photocatalysis the rate of reaction is highly affected by the rate of recombination photo-produced electrons and holes [8,7]. The effects of different additives such as acetic acid, citric acid, salicylic acid on the reduction of chromate in synthetic wastewater were studied by [9] using photocatalysis.…”

“…The present work was devoted to investigate the feasibility of utilizing solar light to degrade Cr (VI) and Cu (II) ions in synthetic wastewater. The effect of the key process parameters on the quality of product was studied by varying the pH (3,5,7,9,and 11), H2O2 (50, 100, 200, and 300 mg/L) and TiO2 loading (0.9, 1.3, and 1.7 …”