Abstract
The treatment of cyanide contaminated wastewater from a gold processing plant was performed by the synthesized nanostructured Layered Double Hydroxide (LDH) which has known as a Hydrotalcite-type anionic clay. LDH was synthesized by the co-precipitation process, characterized by X-ray fluorescence (XRF), X-ray powder diffraction (XRD), scanning electron microscope (SEM) Brunauer-Emmett-Teller (BET), Fourier-transform infrared spectroscopy (FTIR) and Wavelength Dispersive X-ray analysis (WDX) and applied for removal of free cyanide from both synthetic solution and mining effluent. The maximum particle size of synthesized LDH was determined to be 4 nm based on the Scherrer’s equation. The maximum loading capacity of LDH, 60 mg/g, indicates that LDH is an interesting adsorbent for cyanide removal. The data modeling showed that the kinetic and equilibrium data best fitted by FPKM and RPIM, respectively, also, rate-controlling step in the adsorption process is intra-particle diffusion based on Weber–Morris plot, and the adsorption of CN− onto LDH is a two-step process. The thermodynamic studies confirm that the adsorption of free cyanide on Mg/Al LDH is a spontaneous and endothermic process. The energy of activation for adsorption of free cyanide on Mg/Al LDH was determined to be 6.14 kJ/mol, which is in the range physicochemical sorption. The mining wastewater treatment was performed by the synthesized LDH. The adsorption experiments showed that more than 90% of free cyanide was removed from the real solution during a short period of contact time, which confirms the ability of LDH for the treatment of industrial cyanide contaminated wastewater.
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Abbreviations
- EPA:
-
Environmental Protection Agency.
- LDH:
-
Layered Double Hydroxide.
- XRD:
-
X-Ray Diffraction.
- XRF:
-
X-Ray Fluorescence.
- SEM:
-
Scanning Electron Microscopy.
- WDX:
-
Wave length dispersive X-ray.
- FTIR:
-
Fourier transform infrared.
- BET:
-
Brunauer-Emmett-Teller.
- BJH:
-
Barrett–Joyner– Halenda.
- MPSD:
-
Marquardt’s percent standard deviation.
- ARE:
-
Average Relative Error.
- R2 :
-
Correlation coefficient.
- LAIM:
-
Langmuir Isotherm Model.
- FRIM:
-
Freundlich Isotherm Model.
- TEIM:
-
Temkin Isotherm Model.
- RPIM:
-
Redlich–Peterson Isotherm Model.
- KCIM:
-
Koble–Corrigan Isotherm Model.
- ELKM:
-
Elovich Kinetic Model.
- FPKM:
-
Fractional Power Kinetic Model.
- PFOKM:
-
Pseudo-First Order Kinetic Model.
- PSOKM:
-
Pseudo-Second Order Kinetic Model.
- WMIDM:
-
Weber and Morris Intaparticle Diffusion Model.
- qe :
-
The adsorbed cyanide after equilibrium (mg/g).
- qt :
-
The adsorbed cyanide at time t (mg/g).
- D:
-
Mean crystallite size (nm),
- K:
-
A constant value (usually 0.9, but varies based on the crystallite shape),
- λ:
-
X-ray wavelength (0.154 nm for Ka Cu),
- θ:
-
Bragg’s angle in degrees,
- β:
-
Full width at half maximum of a diffraction peak.
- C0 :
-
Initial CN− concentration (mg/L),
- Ce :
-
CN− concentration after equilibrium (mg/L).
- Ct :
-
CN− concentration at time t (mg/L).
- V:
-
Solution volume (L).
- W:
-
Adsorbent mass (g).
- qexp :
-
Experimental amount of CN− adsorbed on the Mg/Al LDH (mg/g).
- qcal :
-
Calculated amount of CN− adsorbed on the Mg/Al LDH (mg/g).
- N:
-
Number of data point.
- p:
-
Number of model parameters.
- T:
-
Absolute temperature (K).
- R:
-
Ideal gas constant (8.314 J mol−1 K−1).
- k1 :
-
PSOKM Type (I) rate constant (g mg−1 h−1).
- A:
-
Temperature-independent factor (min−1).
- Ea :
-
Adsorption activation energy (kJ mol−1).
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Acknowledgments
This work was a part of the MSc thesis of Rasool Alaei (first author), a student of the University of Birjand. The authors are grateful to the Head, Department of mineral processing for providing all the necessary facilities and grants to conduct this research.
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Alaei, R., Javanshir, S. & Behnamfard, A. Treatment of gold ore cyanidation wastewater by adsorption onto a Hydrotalcite-type anionic clay as a novel adsorbent. J Environ Health Sci Engineer 18, 779–791 (2020). https://doi.org/10.1007/s40201-020-00503-x
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DOI: https://doi.org/10.1007/s40201-020-00503-x