Based on the photocatalytic experiments, it can be discerned that the degradation rate of the RhB solution for the PCT-x-550 (x = 0, 300, 350, 400, 450, 500) samples exhibits an increasing trend initially and then a decline with an increase in the x value.
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Waste Biomass-Mediated Synthesis of TiO<sub>2</sub>/P, K-Containing Grapefruit Peel Biochar Composites with Enhanced Photocatalytic Activity.
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The sentences
The surface area, pore volume, and average pore size of the samples showed a trend of initial increase followed by a decline as the x-value increased.