ars.els-cdn.com · Web viewThe pseudo-first-order kinetic plots for the adsorption of fluoride Fig. S2. The pseudo-first-order kinetic plots for the adsorption of fluoride on the
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Supplementary material
Performance of novel hydroxyapatite nanowires in treatment of fluoride
contaminated water
Junyong He a, b, Kaisheng Zhang a, b, Shibiao Wu a, Xingguo Cai a, b, Kai Chen a, b,
Yulian Li a, b, Bai Sun a, Yong Jia a, Fanli Meng a, Zhen Jin a, Lingtao Kong a, *, and
Jinhuai Liu a
a Nano-Materials and Environmental Detection Laboratory, Institute of Intelligent
Machines, Chinese Academy of Sciences, Hefei 230031, People's Republic of China.
b Department of Chemistry, University of Science and Technology of China, Hefei,
Anhui 230026, People's Republic of China.
Corresponding Author
*E-mail address: ltkong@iim.ac.cn (L. Kong); Fax: +86-551-65592420; Tel: +86-551-
65591142.
S1. Membrane filtration system
The injector with HAP membrane in it was fixed on the syringe pump, the flow rate
can be set by the syringe pump. With the pump working, the solution was pushed out
through the membrane dropwise.
S1
Fig. S1. The real filtration system for removal of fluoride.
S2. The pseudo-first-order kinetic plots for the adsorption of fluoride
Fig. S2. The pseudo-first-order kinetic plots for the adsorption of fluoride on the
surface of the HAP nanowires. (adsorbent dose: 0.5 g/L, pH: 7.0)
S3. Langmuir isotherm models for fitting of fluoride adsorption on HAP
nanowires
S2
Fig S3. (a) fluoride adsorption isotherms on HAP nanowires at three different
temperatures (adsorbent dose: 0.5 g/L, pH: 7.0). (b) Freundlich isotherm models for
fitting of fluoride adsorption on HAP nanowires.
S4. Calculation of thermodynamic data
The ln Kd as function of Ce at T = 298 K, 308 K and 318 K was given in Fig. S4.
The adsorption equilibrium constants (K0) at different temperature were obtained by
linear extrapolating Ce to zero, ln K0 = 7.56 at T = 298 K, ln K0 = 7.85 at T = 308 K,
and ln K0 = 8.05 at T = 318 K, and △G0 = −18.73 kJ/mol at 298 K, −20.10 kJ/mol at
308 K, and −21.28 kJ/mol at 318 K, respectively. The values of △H0 and △S0 can be
obtained from the plot of ln K0 vs. 1/T (Fig. S5). The value of △H0 and △S0 was
calculated to be 1.851 kJ/mol and 125.21 J/mol K, respectively.
S3
Fig. S4. Linear plots of lnKd vs Ce for the adsorption of fluoride on HAP nanowires at
298, 308 and 318 K.
Fig. S5. Linear plot of lnK0 vs 1/T for the adsorption of fluoride on HAP nanowires at
298, 308 and 318 K.
S5 Desorption and regeneration
S4
Fig. S6. The fluoride removal using regenerated HAP nanowires. (C0: 5 mg/L,
temperature :25 °C, pH: 7.0, adsorbent dose: 1.5 g/L)
S6 Practical underground water samples
Table S1. Characteristics of the underground water sample from Xingwang Village,
Inner Mongolia of China.
Items Value
pH 7.6
Fluoride (mg/L) 2.820
Chloride (mg/L) 119.6
Nitrate (mg/L) 1.42
Sulfate (mg/L) 4.740
Na (mg/L) 123.4
Mg (mg/L) 12.2
As (mg/L) 0.103
Hg (mg/L) 0.006
Pb (mg/L) 0.003
S5
TOC 31.39
S6
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