Adsorptive removal of lead from acid mine drainage using cobalt-methylimidazolate framework as an adsorbent: kinetics, isotherm, and regeneration

In this work, cobalt-methylimidazolate framework has been used as an adsorbent in the removal of Pb(II) from acid mine drainage in adsorption batch system. X-ray diffraction, Fourier-transform infrared spectroscopy, Brunauer-Emmet-Teller and transmission electron microscope were used for structural,...

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Vydáno v:Environmental science and pollution research international Ročník 26; číslo 4; s. 3330 - 3339
Hlavní autoři: Nqombolo, Azile, Mpupa, Anele, Gugushe, Aphiwe S., Moutloali, Richard M., Nomngongo, Philiswa N.
Médium: Journal Article
Jazyk:angličtina
Vydáno: Berlin/Heidelberg Springer Berlin Heidelberg 01.02.2019
Springer Nature B.V
Témata:
Acid mine drainage
Adsorbents
Adsorption
Adsorptivity
Aquatic Pollution
Atmospheric Protection/Air Quality Control/Air Pollution
atomic absorption spectrometry
batch systems
Cobalt
Design optimization
Design parameters
Drainage systems
Earth and Environmental Science
Ecotoxicology
Emission measurements
Environment
Environmental Chemistry
Environmental Health
Environmental science
Fourier transform infrared spectroscopy
Fourier transforms
Heavy metals
Inductively coupled plasma
Infrared spectroscopy
Isotherms
kinetics
Lead
Metal concentrations
Metal ions
Mine drainage
Optical emission spectroscopy
Organic chemistry
Particle diffusion
Physical characteristics
Regeneration
Research Article
Response surface methodology
sorption isotherms
Spectrometry
Surface chemistry
Surface properties
transmission electron microscopes
Waste Water Technology
Water analysis
Water Management
Water Pollution Control
Water sampling
X ray spectra
X-ray diffraction
Lead
Zeolitic imidazolate framework
Adsorption
Wastewater
Acid mine drainage
Heavy metals
ISSN:0944-1344, 1614-7499, 1614-7499
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Shrnutí:In this work, cobalt-methylimidazolate framework has been used as an adsorbent in the removal of Pb(II) from acid mine drainage in adsorption batch system. X-ray diffraction, Fourier-transform infrared spectroscopy, Brunauer-Emmet-Teller and transmission electron microscope were used for structural, morphological, and surface characteristics of cobalt-methylimidazolate framework. The concentration of heavy metal ions in water samples was measured by inductively coupled plasma optical emission spectrometry. Different experimental factors/variables (such as contact time, dosage, and pH) affecting the adsorption of Pb(II) from acid mine drainage were optimized by response surface methodology based on central composite design. Under optimized experimental parameters, the maximum adsorption capacity of Pb(II) was found to be 105 mg g −1 . The nature of the adsorption process was investigated using Langmuir and Freundlich isotherm models. The obtained data best fitted Langmuir isotherm model suggesting a homogeneous adsorption process. Furthermore, the adsorption mechanism was investigated using five kinetic models, that is, pseudo-first order, pseudo-second order, intraparticle diffusion and Elovich model. The adsorption data fitted better to pseudo-second-order followed by intra-particle diffusion kinetic models suggesting that the adsorption mechanism is dominated by both chemical and physical adsorption processes. The adsorbent could be regenerated up to 8 cycles and it was successfully used in the removal of lead in real acid mine drainage samples.
Bibliografie:ObjectType-Article-1
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ISSN:0944-1344
1614-7499
1614-7499
DOI:10.1007/s11356-018-3868-z