Kinetics and mechanism insights into the photodegradation of tetracycline hydrochloride and ofloxacin mixed antibiotics with the flower-like BiOCl/TiO2 heterojunction

Novel Ternary Heterogeneous Reduction Graphene Oxide (RGO)/BiOCl/TiO2 Nanocomposites for Enhanced Adsorption and Visible-Light Induced Photocatalytic Activity toward Organic Contaminants

“…Compared with the estimated band gaps (about 3 eV) of TiO2 and BiOCl reported in the literature [37,48], the RGO/BiOCl/TiO2 nanocomposites present the narrowest band gap, revealing that they could be easily excited by visible light. The enhanced optical activity of the prepared nanocomposites can be attributed to the heterojunction structures formed in the nanocomposites, causing a band gap UV-vis diffusive reflectance spectra of GO and RGO/BiOCl/TiO 2 nanocomposites with different TiO 2 contents are displayed in Figure 5b.…”

“…It is clear that the estimated band gaps of the nanocomposites first decrease and then increase, and the nanocomposites with 30% of TiO 2 have the smallest band gap. Compared with the estimated band gaps (about 3 eV) of TiO 2 and BiOCl reported in the literature [37,48], the RGO/BiOCl/TiO 2 nanocomposites present the narrowest band gap, revealing that they could be easily excited by visible light. The enhanced optical activity of the prepared nanocomposites can be attributed to the heterojunction structures formed in the nanocomposites, causing a band gap red shift.…”

“…The prepared RGO/BiOCl/TiO 2 nanocomposites also exhibit obvious absorption in the visible light range. This can be attributed to the 3D flower-like structures assembled by nanosheets, allowing the light to multi-reflection [48]. The absorption capacity of the prepared nanocomposites in the visible light range is closely related to their chemical compositions, which leads to different morphologies.…”

“…This has been confirmed by SEM. As a crystalline semiconductor, the absorption near the band edge follows the formula [37,48] (αhv) n = k(hv − E g )…”

A review on tetracycline removal from aqueous systems by advanced treatment techniques

“…37 The heterojunction BiOCl/TiO 2 with ower-like morphology exhibits strong photocatalytic activity with a high surface area, which has shown 82% of TC removal within 10 min of irradiation. 38 In order to overcome aggregation and improve the reusability of TiO 2 nanoparticles, providing a coating with calcite (CaCO 3 ) is generally encouraged, and the sol-gel-synthesized CAL/TiO 2 nanocomposite shows above 90% of TC mineralization under UV irradiation. 39 A material composed of NiO-TiO 2 , known as ilmenite, is formed by the coupling of NiTiO 3 with TiO 2 via coprecipitation method to provide an-heterojunction nanocomposite, and this material has the band-gap energy in the visible region and removes 58% of TC within 2 h along with efficient H 2 production.…”