نبذة مختصرة : Cyanobacteria and their toxins are a threat to drinking water safety as increasingly cyanobacterial blooms (mass occurrences) occur in lakes and reservoirs all over the world. Photocatalytic removal of cyanotoxins by solar light active catalysts is a promising way to purify water at relatively low cost compared to modifying existing infrastructure. We have established a facile and low-cost method to obtain TiO 2 and g-C 3 N 4 coated floating photocatalysts using recycled glass beads. g-C 3 N 4 coated and TiO 2 +g-C 3 N 4 co-coated beads were able to completely remove microcystin-LR in artificial fresh water under both natural and simulated solar light irradiation without agitation in less than 2 h. TiO 2 coated beads achieved complete removal within 8 h of irradiation. TiO 2 +g-C 3 N 4 beads were more effective than g-C 3 N 4 beads as demonstrated by the increase reaction rate with reaction constants, 0.0485 min−1 compared to 0.0264 min−1 respectively, with TiO 2 alone found to be considerably slower 0.0072 min−1. g-C 3 N 4 based photocatalysts showed a similar degradation pathway to TiO 2 based photocatalysts by attacking the C6–C7 double bond on the Adda side chain.
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