Phenoxazine-based covalent organic frameworks as a turn-off fluorescent probe for trace water detection in organic solvents.

Phenoxazine-based COFs (TFPB-DAPO-COF and TFPT-DAPO-COF) were synthesized and exhibited wider characteristic intramolecular charge transfer (ICT) than parent phenoxazine. Phenoxazine-based COFs can form hydrogen bonds with water molecules in aprotic solvents, weakening the ICT effect, and leading to a proportional decrease in fluorescence intensity. Therefore, DAPO-COFs can be used as a tool for the detection of water molecules.

Fe/HO-Strengite method with the enhanced settlement for phosphorus removal and recovery from pharmaceutical effluents.

Phosphorus excessively discharged into the water body is a primary cause of eutrophication, but phosphorus resource is limited and non-renewable. If phosphorus could be recovered from wastewaters, it can not only prevent phosphorus pollution but also achieve the recycling of phosphorus resources. This work proposed a novel strategy, Fe/HO-strengite method with the enhanced settlement, for phosphorus removal and recovery from pharmaceutical wastewater containing organic phosphorus (OP).