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(a,b) Photodegradation of diethyl phthalate (DEP) by sol-gel hydrolysis photocatalysts ([DEP]0 = 1 mg/L; pH = 7; λ = 410 nm; I = 40 mW/cm2; Irradiation time = 120 min); (c,d) Photodegradation efficiency of DEP by sol-gel hydrolysis photocatalysts vs. hydroxyl radical generation and coating film thickness.
