Silica- Iron Oxide Nanocomposite Enhanced with Porogen Agent Used for Arsenic Removal
Abstract
:1. Introduction
2. Materials and Methods
2.1. Synthesis and Characterization Material SiO2/Fe(acac)3/NaF
2.2. Arsenic Adsorption Studies
2.3. Arsenic Desorption Studies
2.4. Arsenic Removal from Real Ground Water
3. Results and Discussion
3.1. Synthesis and Characterization Material SiO2/Fe(acac)3/NaF
X-ray Diffractogram
3.2. Raman and Infrared Spectroscopy
3.3. FT-IR Spectra
3.4. Morphological Study with Atomic Force Microscopy
3.5. Nitrogen Adsorption–Desorption Isotherms
3.6. Magnetic Measurements
3.7. Point of Zero Charge Determination (pHpZc)
3.8. Scanning Electron Microscopy Characterization
3.9. Arsenic Adsorption Studies
3.9.1. pH Effect
3.9.2. Influence of the Adsorbent Dose
3.9.3. Contact Time Effect
3.10. Kinetic Studies
3.11. Theromdinamic Studies
3.12. Initial Concentration Effect. Equilibrium Studies
3.13. Arsenic Adsorption/Desorption Studies
Arsenic Removal from Real Ground Water, Competing Ions Influence
4. Conclusions
Author Contributions
Funding
Conflicts of Interest
References
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Parameters | Content |
---|---|
Ca2+ (mg/L) | 89 ± 8.9 |
Mg2+ (mg/L) | 44 ± 4.4 |
Na+ (mg/L) | 120 ± 12 |
K+ (mg/L) | 1.75 ± 0.17 |
Fen+ (mg/L) | 0.6 ± 0.06 |
Mnn+ (mg/L) | 0.4 ± 0.04 |
Ptotal, (mg/L) | 5.6 ± 0.56 |
, (mg/L) | 4.4 ± 0.44 |
, (mg/L) | 12.3 ± 1.23 |
, (mg/L) | 0.74 ± 0.07 |
, (mg/L) | 8.2 ± 0.82 |
As(III) (μg/L) | 104 ± 10.4 |
Sample Name | Ironed Area (µm2) | Sa (µm) | Sq (µm) | Sp (µm) | Sv (µm) | Sy (µm) | Average Height (µm) |
---|---|---|---|---|---|---|---|
Material (10 µm × 10 µm) | 141.851 | 0.3358 | 0.4618 | 1.9228 | −0.0648 | 1.9876 | 0.2449 |
Material (5 µm × 5 µm) | 40.807 | 0.5047 | 0.5878 | 1.8672 | −0.1181 | 1.9853 | 0.4144 |
Sample | Surface Area, m2/g | Pore Size Distribution, DFT Method, nm | Total Pore Volume | Fhh Value |
---|---|---|---|---|
Material | 276 | 5.564 | 3.940 e−1 cc/g for pores smaller than 130.1 nm | 2.6644 |
Pseudo-First Order Kinetic Model | ||||
Temperature (K) | qe,exp (µg/g) | k1 (min−1) | qe,calc (µg/g) | R2 |
298 | 24.62 | 0.0564 | 10.05 | 0.9076 |
308 | 24.84 | 0.0624 | 11.39 | 0.8437 |
318 | 24.93 | 0.0645 | 13.07 | 0.7943 |
328 | 24.98 | 0.0768 | 19.00 | 0.8333 |
Pseudo-second order kinetic model | ||||
Temperature (K) | qe,exp (µg g−1) | k2 (g µg−1∙min−1) | qe,calc (µg g−1) | R2 |
298 | 24.62 | 661.5 | 19.60 | 0.9930 |
308 | 24.84 | 975.8 | 21.27 | 0.9952 |
318 | 24.93 | 1601.7 | 26.11 | 0.9951 |
328 | 24.98 | 2727.2 | 26.25 | 0.9973 |
Intraparticle diffusion model | ||||
Temperature (K) | kdiff (mg·g−1 min−1/2) | C | R2 | |
298 | 1.32 | 6.71 | 0.8492 | |
308 | 1.78 | 9.05 | 0.8373 | |
318 | 1.84 | 9.58 | 0.8019 | |
328 | 2.10 | 14.01 | 0.8345 |
ΔH° (kJ/mol) | ΔS° (J/mol∙K) | ΔG° (kJ/mol) | R2 | |||
---|---|---|---|---|---|---|
68.56 | 254.6 | 298 K | 308 K | 318 K | 328 K | 0.9906 |
−75.67 | −78.21 | −80.75 | −83.29 |
Langmuir Isotherm | |||
qm,exp (µg/g) | KL (L/µg) | qL (µg/g) | R2 |
574.9 | 0.067 | 650.28 | 0.9711 |
Freundlich isotherm | |||
KF (µg/g) | 1/nF | R2 | |
58.61 | 0.31 | 0.8065 | |
Sips isotherm | |||
KS | qS (µg/g) | 1/nS | R2 |
6.21 | 591.9 | 0.56 | 0.9916 |
Materials | q, µg/g | References |
---|---|---|
Allyl alcohol treated chicken feathers | 0.115 | [64] |
TrisilanolCyclohexyl treated chicken feathers | 0.110 | [64] |
Aluminum oxide NPs | 0.500 | [65] |
Iron oxide-coated sand | 0.029 | [66] |
Activated alumina | 0.180 | [67] |
Modified chicken feathers | 0.130 | [64,68]. |
Rice polish | 0.140 | [69] |
SiO2/Fe(acac)3/NaF | 575.100 | This paper |
Parameters | Content |
---|---|
Ca2+ (mg/L) | 8.90 ± 0.89 |
Mg2+ (mg/L) | 41.20 ± 4.12 |
Na+ (mg/L) | 119.00 ± 11.9 |
K+ (mg/L) | 0.85 ± 0.08 |
Fen+ (mg/L) | 0.20 ± 0.02 |
Mnn+ (mg/L) | 0.03 ± 0.003 |
Ptotal, (mg/L) | 2.60 ± 0.26 |
, (mg/L) | 2.40 ± 0.24 |
, (mg/L) | 11.30 ± 1.13 |
, (mg/L) | 0.34 ± 0.03 |
, (mg/L) | 4.20 ± 0.42 |
As(III) (μg/L) | 9.30 ± 0.93 |
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Mladin, G.; Ciopec, M.; Negrea, A.; Duteanu, N.; Negrea, P.; Ianasi, P.; Ianași, C. Silica- Iron Oxide Nanocomposite Enhanced with Porogen Agent Used for Arsenic Removal. Materials 2022, 15, 5366. https://doi.org/10.3390/ma15155366
Mladin G, Ciopec M, Negrea A, Duteanu N, Negrea P, Ianasi P, Ianași C. Silica- Iron Oxide Nanocomposite Enhanced with Porogen Agent Used for Arsenic Removal. Materials. 2022; 15(15):5366. https://doi.org/10.3390/ma15155366
Chicago/Turabian StyleMladin, Georgiana, Mihaela Ciopec, Adina Negrea, Narcis Duteanu, Petru Negrea, Paula Ianasi, and Cătălin Ianași. 2022. "Silica- Iron Oxide Nanocomposite Enhanced with Porogen Agent Used for Arsenic Removal" Materials 15, no. 15: 5366. https://doi.org/10.3390/ma15155366