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. 2020 Sep 30;755:142588. doi: 10.1016/j.scitotenv.2020.142588

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Fig. 5 — Optimization plots of g-C₃N₄-based metal-free visible-light-enabled photocatalytic disinfection with PMS addition for bacterial inactivation: (a) predicted versus actual values, (b) normal % probability versus internally studentized residuals, (c) 2D contour and (d) 3D response surface for interaction between catalyst loading (X₁) and oxidant addition (X₂).