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- Title
Mesoporous biochar obtained from coir pith on removing nickel(II) from aqueous simulated solution - batch and column studies.
- Authors
Vidhya, L.; Ramya, T.; Vinodha, S.
- Abstract
Biochar derived from coir pith (C-BC) was initiated for the removal of Ni(II) ions from simulated aqueous solution. C-BC showed higher uptake compared with other adsorbents. The surface morphology and functionality of the C-BC before and after adsorption were characterized using scanning electron microscopy-energy dispersive spectroscopy, Fourier transform infrared spectroscopy, and desorption studies reveals the benefits C-BC. The adsorption capacity was effective of C-BC owing to the results from mesoporous structure and large surface area as well as shift in the FT-IR studies. The adsorption of Ni(II) ions onto C-BC was investigated with the effect of contact time, dosage of adsorbent, initial metal concentration and pH of the of Ni(II) ions solution. The experimental maximum sorption capacity of C-BC for Ni(II) removal was approximately 99.8% at pH 7. Through comparison with other natural seed and plant materials, the optimization of biochar adsorption was well described with kinetics, isotherms, and with column studies. The kinetics was found to follow pseudo-second-order with a good correlation coefficient (R2 = 0.9704). Langmuir model implies that chemisorption and monolayer adsorption is the rate-limiting steps. They are found to be the satisfactory fit to the equilibrium adsorption data of C-BC (R² = 0.9921). In column studies, the breakthrough time increased with increase in bed height and decreased with decrease in flow rate and initial Ni(II) concentration. The column data were modeled by Thomas model, modified dose-response model, and Yoon-Nelson model. The results obtained clearly indicates that C-BC could be used for the removal of Ni(II) from simulated aqueous solution. The maximum adsorption capacity of Ni(II) onto C-BC is 99.8 mg g-1, higher than Ni with an average removal power of 65.75% mg g-1 of Platanus orientalis bark. C-BC has an excellent energetic and dynamic performance comparing with BC.
- Subjects
ADSORPTION capacity; BIOCHAR; AQUEOUS solutions; COIR; FOURIER transform infrared spectroscopy
- Publication
Desalination & Water Treatment, 2020, Vol 206, p202
- ISSN
1944-3994
- Publication type
Article
- DOI
10.5004/dwt.2020.26265