Removal of Natural Organic Matter (NOM) from Aqueous Solutions by Multi-Walled Carbon Nanotube Modification with Magnetic Fe₃O₄ Nanoparticles

Table 5

Removal percentage of natural organic matter at a concentration of 20 mg·L⁻¹.

Number of sample	pH	Mixing time (min)	Mixing speed (rpm)	NT concentration (g·L^−1)	Removal efficiency of NOM (%)
					First repetition	Second repetition
1	3	20	60	0.2	43.6	45.65
2	3	40	80	0.5	50.6	50.63
3	3	60	100	1	63.9	62.21
4	3	90	120	1.5	86.4	84.87
5	5	20	80	1	46.8	55.17
6	5	40	60	1.5	47.9	48.21
7	5	60	120	0.2	59.1	50.12
8	5	90	100	0.5	75.2	73.31
9	7	20	100	1.5	42.5	49.91
10	7	40	120	1	48.4	55.87
11	7	60	60	0.5	50.6	55.74
12	7	90	80	0.2	49	48.42
13	9	20	120	0.5	40.9	34.93
14	9	40	100	0.2	50.6	69.32
15	9	60	80	1.5	62.9	50.21
16	9	90	60	1	64.5	41.00