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TiO 2 nanotube arrays (TiO 2 NTs) were regarded as the outstanding semiconductors for the photocatalytic application in waste water treatment and H 2 generation, and CdS nanoparticles as the visible light sensitizers were traditionally used to enhance the photocatalytic performance. In this paper, CdS–CuS co-sensitizers were deposited on TiO 2 NTs by one-pot hydrothermal method, and the Cu/Cd ratio was changed to adjust the hybrid photocatalyst composition and electron transfer. The photocatalytic data indicated that suitable CdS–CuS composition could effectively enhance the photocatalytic pollutant removal and photocurrent/H 2 evolution and the hybrid photocatalyst also exhibited the high stability by the inhibition of CdS photocorrosion. The p-n heterojunction construction of TiO 2 NTs/CdS–CuS benefited the solar response, photoelectron separation and photocatalytic reaction, and the photocatalytic mechanism and photoelectron transfer were investigated. The p-n heterojunctional photocatalyst is supposed to apply in environmental remediation and new energy development. [ABSTRACT FROM AUTHOR]

In this work, a green Fe-doped TiO 2 photocatalyst was successfully synthesized on Ti mesh through the chemical impregnation and anodization method. The influence of sample Fe-content on the photocatalytic performance was investigated in detail. Ordered TiO 2 nanomesh was compactly decorated with nanospheres to form a novel photocatalyst Fe-doped TiO 2 with anatase phase. Simultaneously, it exhibits higher light absorption intensity compared to the pristine TiO 2 within the visible light range, and its absorption peak has a redshift. The VSM results showed that the sample has excellent magnetic properties. It is hard to achieve magnetic agglomeration after magnetic field removal, which benefits the strong recyclability and reusability of Fe-doped TiO 2 photocatalyst. Importantly, this higher visible-light photoresponse of TiO 2 was clearly obtained after Fe doping. When the Fe-content was 0.6 wt%, the degradation rate of methylene blue reached 87.9% under simulated sunlight irradiation for 2.5 h. The prepared nanocrystalline photocatalyst demonstrated excellent photocatalysis because of its prominent crystal morphology, strengthen light-absorption capacity, and commendable inhibition recombination of photo-induced electron-hole. [ABSTRACT FROM AUTHOR]

Summary: The β‐Carotene (BC), an important precursor of vitamin A (VA), possesses antioxidant activity but is fat‐soluble and has low bioavailability. In previous in‐vitro assays evaluating antioxidant and 2,2′‐azobis(2‐amidinopropane) dihydrochloride (AAPH) free radical scavenging, both BC and VA showed a strong ability to scavenge radicals and protected cells from oxidative stress. Here, we used artificially simulated gastrointestinal digestion and Caco‐2 cell absorption models to evaluate the bioavailability of the BC during gastrointestinal digestion and absorption using high‐performance liquid chromatography (HPLC) analysis. We observed high absorptive and transfer rates of BC and detected retinol metabolites (Vitamin A). Therefore, BC can be detected in the acidic gastrointestinal environment using HPLC. Optimised method provided better separation of BC and VA in the column, improving the accuracy of the test results. [ABSTRACT FROM AUTHOR]

Ti3+ self-doped TiO 2-x nanotube arrays (TiO 2-x NTs) were prepared by solvothermal treatment in KBH 4 ethanol solution followed by calcination, and were characterized by field-emission scanning electron microscopy (FE-SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and UV–vis diffusion reflection spectroscopy (DRS). The photoelectrochemical properties of TiO 2-x NTs prepared in different KBH 4 concentrations were investigated. The TiO 2-x NTs exhibited high visible light response, visible light photocurrent and photoelectrocatalytic activities. The active species and photocatalytic mechanism for the dye degradation were proposed, and the improved photoelectrochemical performance was attributed to the synergistic effect of the narrowed energy gap and enhanced electron transportation. The ability to improve the photoelectrochemical properties of TiO 2-x electrode materials should open up new opportunities for high-performance solar cells and photocatalysts. Unlabelled Image • The Ti3+ self-doped TiO 2-x nanotube arrays were prepared by a solvothermal method. • KBH 4 concentrations play key influences on photoelectrochemical performances of TiO 2-x NTs. • The TiO 2-x NTs (0.05) showed the optimal photoelectrochemical activity. [ABSTRACT FROM AUTHOR]