Hierarchical Bi3.64Mo0.36O6.55/Bi2MoO6 isotype heterostructures were successfully prepared via a one-pot hydrothermal route by using Bi2O3 porous nanospheres as a sacrificial template. By tuning the reaction time, the formation process of the Bi3.64Mo0.36O6.55/Bi2MoO6 heterostructure involving Mo etching, phase transition and anisotropic growth was clearly identified. More importantly, the Bi3.64Mo0.36O6.55/Bi2MoO6 heterostructure displayed remarkably enhanced photocatalytic activity for dye photodegradation than pure phase bismuth molybdate due to the efficient electron–hole separation and the interfacial photogenerated hole migration from inside the Bi3.64Mo0.36O6.55 layer to outside the Bi2MoO6 layer. The opposite hole migration from the outer layer to the inner layer was also detected in Bi2O3/Bi2WO6 heterostructures, which resulted in the decrease of photocatalytic activity, further verifying the importance of hole migration direction. This work provides a novel route to fabricate heterostructured photocatalysts, as well as gives a strategy for mediating the charge migration to improve photocatalytic performance.
The photocatalytic performance of graphitic carbon nitride (g-C 3 N 4 ) in the conversion of CO 2 to CH 3 OH is intrinsically constrained by its limited selectivity and activity. Herein, we developed a dual-modification strategy that integrates S doping into the g-C 3 N 4 (CN) skeleton and constructed a 2D/2D S-doped g-C 3 N 4 /Bi 2 MoO 6 Z-scheme heterojunction (SCN/BMO) via microwave-assisted synthesis. This strategy achieved sulfur doping through N-site substitution to modulate the electronic structure of CN, resulting in the formation of a 2D/2D SCN/BMO Z-scheme heterojunction. The optimized 0.3SCN/BMO photocatalyst achieved a methanol production rate of 6.19 μmol·g −1 ·h −1 with 99.15 % selectivity under solar irradiation, showing a 5.16-fold and 2.60-fold enhancement in catalytic activity compared to pristine g-C 3 N 4 and Bi 2 MoO 6 (BMO), respectively. Meanwhile, it demonstrated excellent photocatalytic and structural stability during the cycling tests. Systematic characterization analyses have revealed that the synergistic light-harvesting effect, optimized interfacial coupling, and efficient charge transport pathways within the 2D/2D 0.3SCN/BMO Z-scheme heterostructure collectively contribute to the significant enhancement in photocatalytic performance. Moreover, a feasible photocatalytic mechanism has been put forward by combining the outcomes of in-situ DRIFT spectroscopic analysis with DFT computational modeling. This research finding provides an innovative strategy for the development of highly efficient photocatalysts, which are specifically designed for the selective reduction conversion of CO 2 to CH 3 OH.
Incontinence-associated dermatitis (IAD) leads to persistent tissue damage, antibiotic-resistant infections, and neurogenic inflammation, greatly impairing patients' quality of life. Current therapies fail to simultaneously eliminate resistant bacterial biofilms, neutralize alkaline conditions, and break the cycle of ammonia (NH 3 ) regeneration. Here, a piezoelectric gas therapy strategy based on platinum-decorated bismuth molybdate load in gelatin methacrylate (GelMA) hydrogel (Pt@BMO-Gel) is introduced. Under ultrasound excitation, Pt@BMO generates high piezoelectric potential to improve charge separation, selectively adsorbs NH 3 on BMO (001) crystal facets, efficiently degrades NH 3 to normalize pH, and enables sustained release of H 2 and NO for dual antibacterial and anti-inflammatory effects. Mechanistic insights from theoretical calculations show that the Pt (111) and BMO (001) surfaces lower energy barriers for H 2 formation and N─H bond cleavage, conducive to the generation of NO and H 2 . Transcriptomic profiling reveals downregulation of key nitrogen metabolism genes (arcC/hutH) in methicillin-resistant Staphylococcus aureus (MRSA) and disruption of the (p)ppGpp-mediated stringent response, effectively eradicating bacterial persistence via metabolic reprogramming. This study establishes Pt@BMO as an efficient piezoelectric catalyst for wound therapy, presenting a novel approach in medicine that transforms harmful NH 3 into therapeutic H 2 and NO, offering a promising treatment paradigm for infected wounds, such as incontinence-associated dermatitis.
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