Effects of Initial Nitrate Concentrations and Photocatalyst Dosages on Ammonium Ion in Synthetic Wastewater Treated by Photocatalytic Reduction

Table 2

removal efficiency, []_t, , and []_a of photocatalytic reduction using TiO₂ and 1.0%Ag-TiO₂ photocatalysts at termination.

Photocatalyst	[]0 (mg-N/L)	Dosage (g)	removal (%)		[]a (mg-N/L)	pHt
TiO2	10	0.1-2.0	98.96-99.48	25.81-34.00	2.55-3.38	2.41-2.84
	25	0.1-2.0	99.35-99.92	20.53-36.5	5.10-9.12	2.54-3.11
	50	0.1-2.0	99.84-99.92	9.53-26.40	4.76-13.18	2.80-3.61
	80	0.1-2.0	99.85-99.98	16.35-25.55	13.06-20.43	2.9-3.28
	100	0.1-2.0	99.90-99.95	17.13-22.56	17.12-22.55	2.93-3.3
1.0%Ag-TiO2	10	0.1-2.0	99.60-99.62	19.71-64.09	1.96-6.38	2.50-2.51
	25	0.1-2.0	99.30-99.84	17.59-44.81	4.39-11.19	2.52-2.64
	50	0.1-2.0	99.78-99.90	14.97-45.98	7.47-22.97	2.72-3.03
	80	0.1-2.0	99.85-99.94	19.20-38.15	15.33-30.50	3.00-4.02
	100	0.1-2.0	99.82-99.96	16.12-38.10	16.09-38.10	3.06-5.50

Note: is selectivity (%), []_a is actual [], and pH_t is pH at the end.