Cu2S/TiO2 heterojunction applied to visible light Orange II degradation

Direct microwave–hydrothermal synthesis of Fe-doped titania with extended visible-light response and enhanced H2-production performance

“…The frequency peak position showed almost no change when the Fe dopant concentration ranged from 0.02% to 0.5%, whereas there were shifts to high frequency for S 4 and S 5 . Because the lifetime (s) of the electrons was inversely proportion to the maximum frequency (f) according to the following expression [48]:…”

Photocatalytic degradation of orange II on the novel hetero-system WS2/TiO2 under UV light

“…The CB of the anatase has not been measured because of its poorly sintered character, its value (-0.75 V) is taken from Ref. [17].…”

“…WS 2 -CB is pH insensitive whereas TiO 2 -CB changes usually by -0.06 V pH -1 , we have exploited this property to have an optimal band bending at neutral pH. Owing to the adequate position of its CB, TiO 2 provides a bridge between WS 2 and the O 2 /O 2 • couple since WS 2 -CB (-0.87 V) is more cathodic than TiO 2 -CB (-0.75 V) [17]. Moreover, the synthesis of TiO 2 in the presence of WS 2 in suspension byn the sol-gel method leads to intimate contact, which facilitates the electrons transfer.…”

Enhanced UV–Vis photocatalytic performance of the CuInS 2 /TiO 2 /SnO 2 hetero-structure for air decontamination

“…Additionally, post-deposition treatments at 300°C were applied to improve the crystallinity and the interface homogeneity which is a pre-requisite for efficient charge carriers' mobility in the hetero-structures [37,38]. During annealing, the crystallization process depends on three factors: (1) the incipient crystallisation nuclei formed during the deposition step, (2) optimal post-deposition temperature and (3) interfacial similarity in the crystalline structures.…”