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Degradation of CBZ without photocatalyst with visible light under different conditions ([CBZ]0 = 10 ppm, T = 298 K, without pH regulation, LED light power = 93.4 W, frequency = 20 kHz or 850 kHz, power density = 0.15 W/mL or 0.12 W/mL, continuous stirring of 1500 rpm).
