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Effective removal of Pb
2+from oral medical wastewater via an activated three- dimensional framework carbon (3D AFC)
Fuxiang Song1,2,¥, Na Wang1,2,¥, Zezhou Hu2, Zhen Zhang1, Xiaoxue Mai2, Weibo Jie2,*, Liu Bin1,2,*
1, ¥.School of Nuclear Science and Technology of Lanzhou University, Gansu, Lanzhou, 730000, China.
2, ¥.School/Hospital of Stomatology of Lanzhou University, Gansu, Lanzhou, 730000, China.
Corresponding author: Fuxiang Song, e-mail: songfx09@163.com; liubkq@lzu.edu.cn
¥These authors and institutions have equally contribution to this paper.
The effect of contact time on adsorption
The pseudo-first-order equation was adopted to simulate the adsorption process of Pb2+ on 3D AFC, and the equation is as follow:
t k q q
q
e) log
e 1log(
(1)
where q and qe are the adsorption capacity of the adsorbate on the adsorbent before and after reaching equilibrium, respectively (mg/g or mol/g), k1 is the constant for the pseudo-first-order model (h–1).
Table S1 Critical parameters for the pseudo-first-order model for Pb2+ adsorption on 3D AFC.
Pseudo-first-order rate
qe (mmol/g) K1(h–1) R2
1.51 0.056 0.844
Fig. S1 The kinetic model fitted adsorption property of Pb2+ by pseudo-first-order model. m/V=0.4 g/L, [Pb2+]0=4.8×10-4 mol/L, pH=5.5±0.1, I=0.001 mol/L NaCl, T=25℃.
Adsorption isotherm
Langmuir model was used to describe the adsorption reaction on 3D AFC, the equation is as follow:
e L
e e L
C K
C K q q
1
max
(2)
max max
1 1
q C K q q C
L e e
e
(3)
where qe (mg/g) represents the adsorption capacity at equilibrium, Ce (mg/L) represents the equilibrium Pb2+ concentration, KL represents the adsorption-energy-related Langmuir constant (L/mg), qmax
represents the maximum adsorption capacity of the adsorbate (mg/g), and KF (mg/g) and n are the adsorption capacity and adsorption strength, respectively.
Table S2 Adsorption constants for the Freundlich and Langmuir models.
Freundlich model Langmuir model
KF n R2 qmax (mg/g) KL (g/mg) R2
24.434 2.983 0.9444 243.9 0.0226 0.8647
Fig. S2 The Langmuir model fitted the adsorption isotherms of Pb2+. m/V=0.4 g/L, [Pb2+]0=4.8×10-4 mol/L, pH=5.5±0.1, I=0.001 mol/L NaCl, T=25℃.
