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One-dimensional rod-shaped Ag 2 Mo 2 O 7 /BiOI composite photocatalysts were prepared via a facile hydrothermal-calcining method. The structure, morphologies, and elemental nature of the photocatalysts were characterized. Ag 2 Mo 2 O 7 /BiOI was formed through the attachment of BiOI nanosheets on the surface of Ag 2 Mo 2 O 7 rods, resulting in a 1D/2D heterojunction with larger interface area, more surface-active sites, and faster charge transfer channel. The Ag 2 Mo 2 O 7 /BiOI heterogeneous exhibited excellent and stable photodegradation performances for Rhodamine B (RhB) and Tetracycline (TC) under visible light irradiation. At the optimum composition of 15 wt% BiOI, the Ag 2 Mo 2 O 7 /BiOI heterojunction exhibited a highest degradation rate for RhB and TC, which were 70 times and 16 times higher than those of Ag 2 Mo 2 O 7 , respectively. The improved photocatalytic performance can be attribute to the efficient separation of photoinduced charges caused by the formation of the n-n heterojunction between Ag 2 Mo 2 O 7 and BiOI. Additionally, the dominant active species of photocatalytic reaction were determined to be •O 2 − and h+ by free radical capture experiments and ESR test. In addition, a toxicity test with E. coli was carried out, which shows that the photodegraded Tetracycline solution is basically harmless to E. coli. Based on the experimental results and hybrid density functional theory calculation, a plausible photocatalytic mechanism of n-n heterojunction was proposed. [Display omitted] • One-dimensional rod-shaped Ag 2 Mo 2 O 7 /BiOI were synthesized by a solvothermal method. • Ag 2 Mo 2 O 7 /BiOI can efficiently degrade Tetracycline. • The toxicity of the degraded tetracycline solution was low by E. coli activity detection. • Charge carriers were separated due to the n-n heterojunction and large interface area. [ABSTRACT FROM AUTHOR]

Janus membranes are ideal devices for sustainable fog collection to help alleviate the global water shortage. However, it remains challenging to obtain Janus membranes with sufficient flexibility, low cost, chemical stability and anti-pollution properties. In this work, flexible Janus membranes based on cellulose substrate were fabricated for effective fog collection. We undertook a detailed study of the formation mechanisms of the Janus membranes, which contain an asymmetric growth of titania and a single-side hydrophobic modification. The proper thickness and discontinuity of the hydrophobic layer allow unidirectional water penetration, and the punched holes provide rapid water conveyance channels. The perforated Janus membranes showed the highest fog collection efficiency (∼3 times as much as that of a totally hydrophilic membrane) of the various types that were prepared. Furthermore, the Janus membranes exhibit desirable anti-acid, anti-pollution and reusability properties, which demonstrate application potential in complicated practical settings. • Asymmetric in-situ TiO 2 growth on flexible cellulose material. • Novel fabrication methods for cellulose Janus membranes. • Rapid unidirectional water penetration based on perforated structure. • Enhanced fog collection efficiency compared with totally hydrophilic membranes. [ABSTRACT FROM AUTHOR]