ZnS/Ag2S decorated PES membrane with efficient near-infrared response and enhanced photocatalysis for pollutants photodegradation on high-turbidity water

Synthesis of the Ag2S/PANI@PES Composite Membrane and Its Antipollution Properties

“…Constructing heterostructures with other semiconductor materials addresses the recombination issue and improves the light capture performance, thereby augmenting the photocatalytic activity. For instance, the ZnS/Ag 2 S@PES photocatalytic membrane, innovatively fabricated by Zhao et al via successive layer adsorption and ionic layer exchange methods, forms beneficial heterojunctions between Ag 2 S and ZnS, which enhances the membrane light-absorbing capacity . This structure enables substantial photodegradation of organic pollutants in turbid wastewater and efficiently achieves greater than 95% photodegradation efficiency for methylene blue (MB) and tetracycline with just two filtration cycles.…”

Hollow Bi5O7I:Er3+-Yb3+ Nanoflowers in Flexible Fibrous Membranes for Catalytic Purification and Temperature Monitoring

“…Among various photocatalysts, bismuth oxyiodide (Bi x O y I z ) exhibits unusual photocatalytic performance because the typical layered structure features possess an internal static electric field vertical to each layer, which may promote the separation of electron and hole pairs. − As a typical semiconductor photocatalytic material, Bi 5 O 7 I (BOI) exhibits excellent photocatalytic activity for decomposing various pollutants with complex structures into small molecules owing to its negatively positioned conduction band. − However, the high recombination rate of photoinduced electrons and holes and wide band gaps severely restrict its photocatalytic performance and further application. − To deal with these problems, extensive endeavors have been devoted to improving its photocatalytic activity by ion doping, modulating its morphology, constructing heterostructures, and so on. − In these strategies, rare earth (RE 3+ ) ion doping is recognized as an effective strategy, which can modulate the position of the photocatalyst conduction band or valence band and consequently decrease the semiconductor bandgap, thereby extending the light absorption range of the photocatalyst. − In addition, BOI would also be a good luminescent host for Er 3+ and Yb 3+ ions due to the similar ionic radii as well as the same valence among Bi 3+ , Er 3+ , and Yb 3+ ions.…”