Supported Nanosized α-FeOOH Improves Efficiency of Photoelectro-Fenton Process with Reaction-Controlled pH Adjustment for Sustainable Water Treatment

Table 1

Duration of the steps in the PE-Fenton process with RCpA using different iron substances (current density, 6 mA cm⁻²; N-α-FeOOH/diatomite, 500 mg L⁻¹; free iron, 25 mg L⁻¹).

Step	Duration of steps (min)
	Fe^3+	N-α-FeOOH/diatomite
pH decrease	45	40
PE-Fenton reaction	75	100
pH increase	45	40
Iron settlement	180	15
Total time*	300	140

*pH decrease and pH increase proceeded simultaneously, and time was included for an individual step; the time for iron settlement was included in the pH increase as the time for pH increase was longer than the settlement, otherwise, the latter included the former.