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Nano-TiO2 (nTiO2) is widely used in industry, and some of it is inevitably released into natural aquatic environments. nTiO2 can be deposited on the streambed or transported along the stream and streambed, and it can also undergo exchange-transfer processes in these systems. The behavior of nTiO2 in rivers includes deposition-transfer processes in the stream and exchange-transfer processes between...