40
Ie. V. Pylypchuk et al.
Table 2.2 Degree of DR removal (R, %) by Fe 3 O 4 /H£ NC as a function of a solution
concentration and an adsorption time
R, %
´ 0 , mg/ml
30 min.
135 min.
300 min.
1380 min.
1620 min.
0.13
53.8
73.1
88.5
97.0
97.0
0.26
46.2
69.2
86.5
95.8
97.7
0.32
50.0
65.6
84.4
95.6
97.2
0.52
46.2
57.7
77.0
92.3
95.2
0.64
53.1
64.0
79.7
93.8
96.1
1.04
49.0
59.6
69.2
80.8
87.5
0
200 400 600 800 1000 1200 1400 1600 1800
0
20
40
60
80
100
120
140
160
А (mg/g)
t, min.
С=0,13 mg/ml
С=0,26 mg/ml
С=0,32 mg/ml
С=0,52 mg/ml
С=0,64 mg/ml
С=1,04 mg/ml
Fig. 2.5 Relationship of DR adsorption by Fe 3 O 4 /H£ NC in PF vs. time. The insertion shows the
initial concentrations of DR solutions
Table 2.3 Relationship of
DR desorption (£ Dτ , %) from
the surface of Fe 3 O 4 /H£/DR
NC into saline solution vs.
time at different initial
quantities (£) of DR
immobilized by adsorption
£, mg/g D, %
20 min. 60 min. 180 min. 400 min.
21.0
83.8
84.3
84.3
84.8
42.3
76.4
76.6
76.8
77.0
51.9
61.5
62.1
62.4
62.6
82.5
11.6
11.5
12.1
12.7
102.5
7.0
6.1
8.3
8.7
151.7
2.2
2.3
2.3
2.4