Novel alginate immobilized TiO₂ reusable functional hydrogel beads with high photocatalytic removal of dye pollutions

Abstract TiO 2 semiconductor photocatalysis is an effective technology for the treatment of wastewater containing organic dye pollutants, which has been received extensive focus. However, problems in recovery and reutilization process impede large-scale applications particulate photocatalytic materials. Herein, a macro sized hydrogel bead loaded with nano powder was successfully prepared by taking advantage cross-linking gel property alginate salt, could form egg-box structure naturally when Na + ions sodium (SA) were replaced divalent such as Cu 2+ , Co Sr ions. The degradation rate methyl orange (MO) solution presence beads reaches 99% within 60 min under ultraviolet light irradiation, competitive that powder. Furthermore, this strategy maintain over 95% after 10 cycles process. results indicate network immobilize disperse particle effectively, it readily spherical to contact harvest light, making have excellent functions. Also, based integrate good performance high stability recyclability perfectly.