Figure 2From: Interactions between photodegradation componentsInteraction between two parameters of p-cresol photodegradation while other two variables kept constant during the process, (a) interaction between irradiation time and photocatalyst amount, (b) interaction between pH and photocatalyst, (c) interaction between concentration of p-cresol and photocatalyst. The red and black lines on the Figures 2 and 3 are the above axes and below axes as showed on the figures respectively which provided by the software (RSM).Back to article page