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More and more attention is paid to dissolved organic nitrogen (DON) and some specific categories of amino acids are considered to be the direct precursors of nitrogenous disinfection byproducts (N-DBPs). Histidine was chosen to study the efficiency and mechanism of amino acid in UV/Cu-TiO2 system. Moreover, the influences of pH, organics, and inorganic ion on the photocatalytic efficiency were also investigated. The results show that the degradation rate of DON in the UV/Cu-TiO2 system was about 50% after 60 min, and it was much lower than that of histidine (72%), which indicated that a part of degraded histidine was oxidized to other N-containing organics. The optimal pH value was 7.0 for the photodegradation of histidine, and the presence of organic compound and inorganic ion would decrease the degradation performance to some extent. After 6 h irradiation, histidine was totally degraded into NH4+, and in the following 2 h, NH4+ was oxidized to NO3- firstly and then NO3- was reduced to N2 and overflowed from water, which should be attributed to the doping of Cu in the TiO2 and provided a way to totally degrade the DON from the water

Performance and Mechanism of UV/Immobilized Cu-TiO2System to Degradation Histidine

Performance and Mechanism of UV/Immobilized Cu-TiO₂System to Degradation Histidine