Journal
SEPARATION AND PURIFICATION TECHNOLOGY
Volume 277, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.seppur.2021.119628
Keywords
Alginate; Hydrogel beads; BiOCl; OVs; Photocatalysis
Categories
Funding
- Tianjin Natural Science Foundation of China [18JCYBJC87600]
- Tianjin Graduate Research and Innovation Project of China [2019YJSS002]
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By immobilizing oxygen vacancies from BiOCl nanosheets in water-rich calcium alginate hydrogel beads, the photocatalytic performance can be enhanced, and the beads can be regenerated for repeated use in wastewater treatment.
Photo-induced oxygen vacancies (OVs) are widely introduced as active sites in BiOCl to improve photocatalytic performance. Herein, we propose a strategy to take advantage of OVs of BiOCl nanosheets, which are immobilized in the network of water-rich calcium alginate (CA) hydrogel beads. By modulating the porous structure of the hydrogel, the OVs irradiated by UV light on the surface of BiOCl can be rapidly diffused to the deep inner of the beads, and then they disappear after the beads are immersed into the water for hours, which further enables the regeneration of even better BiOCl-CA beads. This reactive cyclic channel in a water-rich environment improves the transport of photogenerated carriers and achieves excellent cyclic photocatalytic performance. This work not only improves the recovery efficiency of photocatalytic materials but also puts forward a new system of BiOCl based hydrogel beads that can be used repeatedly in wastewater treatment.
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