Comparison on the Surface Structure Properties along with Fe(II) and Mn(II) Removal Characteristics of Rice Husk Ash, Inactive Saccharomyces cerevisiae Powder, and Rice Husk
Table 2
Isotherm model constants and nonlinear regression parameters for fit of Fe(II) and Mn(II) adsorbed on the three kinds of adsorbents.
Metal ions
Isotherm models
Parameters or constants
Adsorbents
RHA
ISP
RH
Fe(II)
Freundlich
2.649
1.549
0.948
1/
0.503
0.510
0.598
0.901
0.900
0.958
Langmuir
(L/mg)
1.032
0.673
0.332
(mg/g)
6.211
4.464
4.049
0.995
0.995
0.997
D-R
(kJ/mol)
2.590
0.910
0.430
1.360
1.060
0.800
0.502
0.654
0.730
Mn(II)
Freundlich
1.379
0.873
0.527
1/
0.345
0.379
0.437
0.892
0.918
0.909
Langmuir
(L/mg)
0.907
0.687
0.320
(mg/g)
3.016
2.229
1.899
0.986
0.994
0.990
D-R
(kJ/mol)
2.650
0.520
0.360
1.380
0.850
0.680
0.480
0.709
0.735
Note. The three kinds of adsorbents include the following: rice husk ash, RHA; inactive Saccharomyces cerevisiae powder, ISP; rice husk, RH.
