Fabrication and Mechanism Insight of Multidimensional Coupled Metal-Free van der Waals Heterostructures for Enhanced Photocatalytic Hydrogen Evolution.

It is an arduous issue to significantly improve the charge separation efficiency of polymer photocatalysts due to their inherently high exciton binding energy. Herein, based on an interfacial coupling and atom diffusion strategy, a metal-free 3D/2D van der Waals (VdW) heterojunction is fabricated through the modification of rich-vacancy wrinkle-like S (Vs-S) microspheres on the surface of S-doped polymeric carbon nitride (S-PCN) nanosheets. The insight into the mechanism reveals that the interfacial coupling effect induces a strong built-in electric field from S-PCN to Vs-S, and the carrier transfer behavior abides by the type-II charge transfer pathway, thereby dramatically improving the separation efficiency and transport kinetics of photogenerated carriers.

O oxidation excited by yellow phosphorus emulsion coupling with red mud absorption for denitration.

Directing to unwieldiness NOx emitted by the industry, the removal of NOx was implemented using yellow phosphorus (P) emulsion and red mud slurry as composite absorbent. Where yellow phosphorus is considered to stimulate formation of the ecological ozone (O) from O, the oxidation of insoluble NO into water-soluble NOx species by O, and the red mud as a pH buffer can be used to maintain the pH of the absorption liquid in a range that better absorbs NOx. NO is finally converted into NO and NO, whereas the yellow phosphorus is mainly PO.

Simultaneous removal of SO and NO using a novel method with red mud as absorbent combined with O oxidation.

Aiming at SO and NO in industrial flue gas, the simultaneous removal of SO and NO was conducted using red mud as absorbent with O oxidation. The effects of different factors on the desulfurization and denitration efficiency were investigated. The results show that the increase of oxidation temperature is not conducive to the absorption of NO (O/NO molar ratio >1).