XXXI International Mineral Processing Congress 2024 Proceedings/Washington, DC/Sep 29–Oct 3 1251
WCC and SW and more lanthanum adsorption was likely
expected in AH.
Adsorption—Desorption Tests Results
Figure 5 shows the effect of pH on the lanthanum adsorp-
tion performance. pH is one of the most important oper-
ating parameters which significantly impacts how well
sorbates adhere to adsorbents. The maximum lanthanum
uptake in the three biochars was exhibited at pH five.
Therefore, it was selected as the optimum pH level for the
remaining study. AH showed a higher uptake than WCC
and SW. Additionally, it can be observed that the large vari-
ation in the uptake percentage of the different biochars at
various pH levels may be due to the diverse characteristics
of the biochars.
The test results performed at varying contact time are
seen in Figure 6. Lanthanum adsorption experiments were
conducted at different contact times to observe the time
required for the sorbents SW, WCC, and AH to reach equi-
librium under the same conditions. It can be seen from the
figure that the sorbents SW and WCC had almost attained
equilibrium within a short period (10–60 minutes). This is
evident by the fact that there are numerous sorption sites
available at the initial stage of the adsorption process, which
resulted in the rapid attachment of lanthanum to the bio-
char surfaces hence, at the latter stages is kept constant as
0
0.02
0.04
0.06
0.08
0 50 100 150 200
Pore diameter(nm)
SW
WCC
AH
Figure 3. Pore size distribution of SW, WCC, and AH
a b c
Figure 4. SEM images of biochars for SW (a), WCC (b), and AH (c) before lanthanum adsorption
P
orvolume
e
(cm^3/g)
WCC and SW and more lanthanum adsorption was likely
expected in AH.
Adsorption—Desorption Tests Results
Figure 5 shows the effect of pH on the lanthanum adsorp-
tion performance. pH is one of the most important oper-
ating parameters which significantly impacts how well
sorbates adhere to adsorbents. The maximum lanthanum
uptake in the three biochars was exhibited at pH five.
Therefore, it was selected as the optimum pH level for the
remaining study. AH showed a higher uptake than WCC
and SW. Additionally, it can be observed that the large vari-
ation in the uptake percentage of the different biochars at
various pH levels may be due to the diverse characteristics
of the biochars.
The test results performed at varying contact time are
seen in Figure 6. Lanthanum adsorption experiments were
conducted at different contact times to observe the time
required for the sorbents SW, WCC, and AH to reach equi-
librium under the same conditions. It can be seen from the
figure that the sorbents SW and WCC had almost attained
equilibrium within a short period (10–60 minutes). This is
evident by the fact that there are numerous sorption sites
available at the initial stage of the adsorption process, which
resulted in the rapid attachment of lanthanum to the bio-
char surfaces hence, at the latter stages is kept constant as
0
0.02
0.04
0.06
0.08
0 50 100 150 200
Pore diameter(nm)
SW
WCC
AH
Figure 3. Pore size distribution of SW, WCC, and AH
a b c
Figure 4. SEM images of biochars for SW (a), WCC (b), and AH (c) before lanthanum adsorption
P
orvolume
e
(cm^3/g)
