Performance of NiFe₂O₄-SiO₂-TiO₂ Magnetic Photocatalyst for the Effective Photocatalytic Reduction of Cr(VI) in Aqueous Solutions

Table 2

Reusability study showing the % reduction efficiency of Cr(VI) after 3 runs using 200 mg photocatalyst at pH 4 for 300 min.

Time (min)		1st run (%)			2nd run (%)			3rd run (%)
	NT	NST	TiO2	NT	NST	TiO2	NT	NST	TiO2
0	0	0	0	0	0	0	0	0	0
5	0.497	0.551	0.92	0.408	0.503	0.844	0.259	0.294	0.621
15	3.683	4.974	11.60	2.961	4.426	10.248	2.004	3.636	8.33
30	9.576	11.602	29.28	8.491	10.816	28.661	6.219	7.56	19.509
60	14.512	20.626	43.64	13.62	19.534	42.963	9.531	10.86	30.621
90	17.311	38.31	54.69	16.011	24.525	50.215	12.538	14.229	44.335
120	22.449	41.44	71.27	21.966	38.661	62.55	18.88	19.48	56.804
150	25.23	66.85	80.29	24.606	51.599	75.53	20.795	26.585	68.5
180	33.333	78.45	89.50	31.961	66.231	82.08	26.216	33.551	76.13
210	41.768	83.61	94.29	40.31	72.741	89.09	32.706	48.606	82.61
240	48.674	88.95	96.69	48.001	79.495	94.77	36.592	56.07	90.0
270	54.788	92.82	100	53.662	85.536	100	44.68	61.254	100
300	60.424	96.50	100	59.311	90.08	100	50.361	68.92	100

Key. NT: nickel titanium dioxide photocatalyst; NST: nickel silane titanium dioxide photocatalyst.